Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: (41 commits)
  [IA64] Fix annoying IA64_TR_ALLOC_MAX message.
  [IA64] kill sys32_pipe
  [IA64] remove sys32_pause
  [IA64] Add Variable Page Size and IA64 Support in Intel IOMMU
  ia64/pv_ops: paravirtualized instruction checker.
  ia64/xen: a recipe for using xen/ia64 with pv_ops.
  ia64/pv_ops: update Kconfig for paravirtualized guest and xen.
  ia64/xen: preliminary support for save/restore.
  ia64/xen: define xen machine vector for domU.
  ia64/pv_ops/xen: implement xen pv_time_ops.
  ia64/pv_ops/xen: implement xen pv_irq_ops.
  ia64/pv_ops/xen: define the nubmer of irqs which xen needs.
  ia64/pv_ops/xen: implement xen pv_iosapic_ops.
  ia64/pv_ops/xen: paravirtualize entry.S for ia64/xen.
  ia64/pv_ops/xen: paravirtualize ivt.S for xen.
  ia64/pv_ops/xen: paravirtualize DO_SAVE_MIN for xen.
  ia64/pv_ops/xen: define xen paravirtualized instructions for hand written assembly code
  ia64/pv_ops/xen: define xen pv_cpu_ops.
  ia64/pv_ops/xen: define xen pv_init_ops for various xen initialization.
  ia64/pv_ops/xen: elf note based xen startup.
  ...

79 files changed, 5363 insertions, 185 deletions

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 912c57db2d21..27eec71429b0 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -23,6 +23,7 @@ config IA64
         select HAVE_KRETPROBES
         select HAVE_DMA_ATTRS
         select HAVE_KVM
+        select HAVE_ARCH_TRACEHOOK
         default y
         help
           The Itanium Processor Family is Intel's 64-bit successor to
@@ -110,6 +111,33 @@ config AUDIT_ARCH
         bool
         default y
 
+menuconfig PARAVIRT_GUEST
+        bool "Paravirtualized guest support"
+        help
+          Say Y here to get to see options related to running Linux under
+          various hypervisors.  This option alone does not add any kernel code.
+
+          If you say N, all options in this submenu will be skipped and disabled.
+
+if PARAVIRT_GUEST
+
+config PARAVIRT
+        bool "Enable paravirtualization code"
+        depends on PARAVIRT_GUEST
+        default y
+        bool
+        default y
+        help
+          This changes the kernel so it can modify itself when it is run
+          under a hypervisor, potentially improving performance significantly
+          over full virtualization.  However, when run without a hypervisor
+          the kernel is theoretically slower and slightly larger.
+
+
+source "arch/ia64/xen/Kconfig"
+
+endif
+
 choice
         prompt "System type"
         default IA64_GENERIC
@@ -119,6 +147,7 @@ config IA64_GENERIC
         select NUMA
         select ACPI_NUMA
         select SWIOTLB
+        select PCI_MSI
         help
           This selects the system type of your hardware.  A "generic" kernel
           will run on any supported IA-64 system.  However, if you configure
@@ -126,11 +155,13 @@ config IA64_GENERIC
 
           generic               For any supported IA-64 system
           DIG-compliant         For DIG ("Developer's Interface Guide") compliant systems
+          DIG+Intel+IOMMU       For DIG systems with Intel IOMMU
           HP-zx1/sx1000         For HP systems
           HP-zx1/sx1000+swiotlb For HP systems with (broken) DMA-constrained devices.
           SGI-SN2               For SGI Altix systems
           SGI-UV                For SGI UV systems
           Ski-simulator         For the HP simulator <http://www.hpl.hp.com/research/linux/ski/>
+          Xen-domU              For xen domU system
 
           If you don't know what to do, choose "generic".
 
@@ -138,6 +169,11 @@ config IA64_DIG
         bool "DIG-compliant"
         select SWIOTLB
 
+config IA64_DIG_VTD
+        bool "DIG+Intel+IOMMU"
+        select DMAR
+        select PCI_MSI
+
 config IA64_HP_ZX1
         bool "HP-zx1/sx1000"
         help
@@ -181,6 +217,10 @@ config IA64_HP_SIM
         bool "Ski-simulator"
         select SWIOTLB
 
+config IA64_XEN_GUEST
+        bool "Xen guest"
+        depends on XEN
+
 endchoice
 
 choice
@@ -583,6 +623,16 @@ source "drivers/pci/hotplug/Kconfig"
 
 source "drivers/pcmcia/Kconfig"
 
+config DMAR
+        bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
+        depends on IA64_GENERIC && ACPI && EXPERIMENTAL
+        help
+          DMA remapping (DMAR) devices support enables independent address
+          translations for Direct Memory Access (DMA) from devices.
+          These DMA remapping devices are reported via ACPI tables
+          and include PCI device scope covered by these DMA
+          remapping devices.
+
 endmenu
 
 endif
diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 905d25b13d5a..58a7e46affda 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -53,12 +53,15 @@ libs-y				+= arch/ia64/lib/
 core-y                          += arch/ia64/kernel/ arch/ia64/mm/
 core-$(CONFIG_IA32_SUPPORT)     += arch/ia64/ia32/
 core-$(CONFIG_IA64_DIG)         += arch/ia64/dig/
+core-$(CONFIG_IA64_DIG_VTD)     += arch/ia64/dig/
 core-$(CONFIG_IA64_GENERIC)     += arch/ia64/dig/
 core-$(CONFIG_IA64_HP_ZX1)      += arch/ia64/dig/
 core-$(CONFIG_IA64_HP_ZX1_SWIOTLB) += arch/ia64/dig/
+core-$(CONFIG_IA64_XEN_GUEST)   += arch/ia64/dig/
 core-$(CONFIG_IA64_SGI_SN2)     += arch/ia64/sn/
 core-$(CONFIG_IA64_SGI_UV)      += arch/ia64/uv/
 core-$(CONFIG_KVM)              += arch/ia64/kvm/
+core-$(CONFIG_XEN)              += arch/ia64/xen/
 
 drivers-$(CONFIG_PCI)           += arch/ia64/pci/
 drivers-$(CONFIG_IA64_HP_SIM)   += arch/ia64/hp/sim/
diff --git a/arch/ia64/configs/generic_defconfig b/arch/ia64/configs/generic_defconfig
index 9f483976228f..e05f9e1d3faa 100644
--- a/arch/ia64/configs/generic_defconfig
+++ b/arch/ia64/configs/generic_defconfig
@@ -233,6 +233,8 @@ CONFIG_DMIID=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_MISC=m
 
+# CONFIG_DMAR is not set
+
 #
 # Power management and ACPI
 #
diff --git a/arch/ia64/configs/tiger_defconfig b/arch/ia64/configs/tiger_defconfig
index 797acf9066c1..c522edf23c62 100644
--- a/arch/ia64/configs/tiger_defconfig
+++ b/arch/ia64/configs/tiger_defconfig
@@ -172,6 +172,8 @@ CONFIG_DMIID=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_MISC=m
 
+# CONFIG_DMAR is not set
+
 #
 # Power management and ACPI
 #
diff --git a/arch/ia64/dig/Makefile b/arch/ia64/dig/Makefile
index 971cd7870dd4..5c0283830bd6 100644
--- a/arch/ia64/dig/Makefile
+++ b/arch/ia64/dig/Makefile
@@ -6,4 +6,9 @@
 #
 
 obj-y := setup.o
+ifeq ($(CONFIG_DMAR), y)
+obj-$(CONFIG_IA64_GENERIC) += machvec.o machvec_vtd.o dig_vtd_iommu.o
+else
 obj-$(CONFIG_IA64_GENERIC) += machvec.o
+endif
+obj-$(CONFIG_IA64_DIG_VTD) += dig_vtd_iommu.o
diff --git a/arch/ia64/dig/dig_vtd_iommu.c b/arch/ia64/dig/dig_vtd_iommu.c
new file mode 100644
index 000000000000..1c8a079017a3
--- /dev/null
+++ b/arch/ia64/dig/dig_vtd_iommu.c
@@ -0,0 +1,59 @@
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/intel-iommu.h>
+
+void *
+vtd_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
+                 gfp_t flags)
+{
+        return intel_alloc_coherent(dev, size, dma_handle, flags);
+}
+EXPORT_SYMBOL_GPL(vtd_alloc_coherent);
+
+void
+vtd_free_coherent(struct device *dev, size_t size, void *vaddr,
+                 dma_addr_t dma_handle)
+{
+        intel_free_coherent(dev, size, vaddr, dma_handle);
+}
+EXPORT_SYMBOL_GPL(vtd_free_coherent);
+
+dma_addr_t
+vtd_map_single_attrs(struct device *dev, void *addr, size_t size,
+                     int dir, struct dma_attrs *attrs)
+{
+        return intel_map_single(dev, (phys_addr_t)addr, size, dir);
+}
+EXPORT_SYMBOL_GPL(vtd_map_single_attrs);
+
+void
+vtd_unmap_single_attrs(struct device *dev, dma_addr_t iova, size_t size,
+                       int dir, struct dma_attrs *attrs)
+{
+        intel_unmap_single(dev, iova, size, dir);
+}
+EXPORT_SYMBOL_GPL(vtd_unmap_single_attrs);
+
+int
+vtd_map_sg_attrs(struct device *dev, struct scatterlist *sglist, int nents,
+                 int dir, struct dma_attrs *attrs)
+{
+        return intel_map_sg(dev, sglist, nents, dir);
+}
+EXPORT_SYMBOL_GPL(vtd_map_sg_attrs);
+
+void
+vtd_unmap_sg_attrs(struct device *dev, struct scatterlist *sglist,
+                   int nents, int dir, struct dma_attrs *attrs)
+{
+        intel_unmap_sg(dev, sglist, nents, dir);
+}
+EXPORT_SYMBOL_GPL(vtd_unmap_sg_attrs);
+
+int
+vtd_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+        return 0;
+}
+EXPORT_SYMBOL_GPL(vtd_dma_mapping_error);
diff --git a/arch/ia64/dig/machvec_vtd.c b/arch/ia64/dig/machvec_vtd.c
new file mode 100644
index 000000000000..7cd3eb471cad
--- /dev/null
+++ b/arch/ia64/dig/machvec_vtd.c
@@ -0,0 +1,3 @@
+#define MACHVEC_PLATFORM_NAME           dig_vtd
+#define MACHVEC_PLATFORM_HEADER         <asm/machvec_dig_vtd.h>
+#include <asm/machvec_init.h>
diff --git a/arch/ia64/ia32/ia32_entry.S b/arch/ia64/ia32/ia32_entry.S
index 53505bb04771..a8cf19958850 100644
--- a/arch/ia64/ia32/ia32_entry.S
+++ b/arch/ia64/ia32/ia32_entry.S
@@ -108,6 +108,11 @@ GLOBAL_ENTRY(ia32_trace_syscall)
         ;;
         st8 [r2]=r3                             // initialize return code to -ENOSYS
         br.call.sptk.few rp=syscall_trace_enter // give parent a chance to catch syscall args
+        cmp.lt p6,p0=r8,r0                      // check tracehook
+        adds r2=IA64_PT_REGS_R8_OFFSET+16,sp    // r2 = &pt_regs.r8
+        ;;
+(p6)    st8.spill [r2]=r8                       // store return value in slot for r8
+(p6)    br.spnt.few .ret4
 .ret2:  // Need to reload arguments (they may be changed by the tracing process)
         adds r2=IA64_PT_REGS_R1_OFFSET+16,sp    // r2 = &pt_regs.r1
         adds r3=IA64_PT_REGS_R13_OFFSET+16,sp   // r3 = &pt_regs.r13
@@ -199,10 +204,10 @@ ia32_syscall_table:
         data8 sys_setuid        /* 16-bit version */
         data8 sys_getuid        /* 16-bit version */
         data8 compat_sys_stime    /* 25 */
-        data8 sys32_ptrace
+        data8 compat_sys_ptrace
         data8 sys32_alarm
         data8 sys_ni_syscall
-        data8 sys32_pause
+        data8 sys_pause
         data8 compat_sys_utime    /* 30 */
         data8 sys_ni_syscall      /* old stty syscall holder */
         data8 sys_ni_syscall      /* old gtty syscall holder */
@@ -215,7 +220,7 @@ ia32_syscall_table:
         data8 sys_mkdir
         data8 sys_rmdir           /* 40 */
         data8 sys_dup
-        data8 sys32_pipe
+        data8 sys_pipe
         data8 compat_sys_times
         data8 sys_ni_syscall      /* old prof syscall holder */
         data8 sys32_brk           /* 45 */
diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index f4430bb4bbdc..5e92ae00bdbb 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/arch/ia64/ia32/sys_ia32.c
@@ -1098,21 +1098,6 @@ sys32_mremap (unsigned int addr, unsigned int old_len, unsigned int new_len,
         return ret;
 }
 
-asmlinkage long
-sys32_pipe (int __user *fd)
-{
-        int retval;
-        int fds[2];
-
-        retval = do_pipe_flags(fds, 0);
-        if (retval)
-                goto out;
-        if (copy_to_user(fd, fds, sizeof(fds)))
-                retval = -EFAULT;
-  out:
-        return retval;
-}
-
 asmlinkage unsigned long
 sys32_alarm (unsigned int seconds)
 {
@@ -1209,25 +1194,6 @@ sys32_waitpid (int pid, unsigned int *stat_addr, int options)
         return compat_sys_wait4(pid, stat_addr, options, NULL);
 }
 
-static unsigned int
-ia32_peek (struct task_struct *child, unsigned long addr, unsigned int *val)
-{
-        size_t copied;
-        unsigned int ret;
-
-        copied = access_process_vm(child, addr, val, sizeof(*val), 0);
-        return (copied != sizeof(ret)) ? -EIO : 0;
-}
-
-static unsigned int
-ia32_poke (struct task_struct *child, unsigned long addr, unsigned int val)
-{
-
-        if (access_process_vm(child, addr, &val, sizeof(val), 1) != sizeof(val))
-                return -EIO;
-        return 0;
-}
-
 /*
  *  The order in which registers are stored in the ptrace regs structure
  */
@@ -1525,49 +1491,15 @@ restore_ia32_fpxstate (struct task_struct *tsk, struct ia32_user_fxsr_struct __u
         return 0;
 }
 
-asmlinkage long
-sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+        compat_ulong_t caddr, compat_ulong_t cdata)
 {
-        struct task_struct *child;
-        unsigned int value, tmp;
+        unsigned long addr = caddr;
+        unsigned long data = cdata;
+        unsigned int tmp;
         long i, ret;
 
-        lock_kernel();
-        if (request == PTRACE_TRACEME) {
-                ret = ptrace_traceme();
-                goto out;
-        }
-
-        child = ptrace_get_task_struct(pid);
-        if (IS_ERR(child)) {
-                ret = PTR_ERR(child);
-                goto out;
-        }
-
-        if (request == PTRACE_ATTACH) {
-                ret = sys_ptrace(request, pid, addr, data);
-                goto out_tsk;
-        }
-
-        ret = ptrace_check_attach(child, request == PTRACE_KILL);
-        if (ret < 0)
-                goto out_tsk;
-
         switch (request) {
-              case PTRACE_PEEKTEXT:
-              case PTRACE_PEEKDATA:     /* read word at location addr */
-                ret = ia32_peek(child, addr, &value);
-                if (ret == 0)
-                        ret = put_user(value, (unsigned int __user *) compat_ptr(data));
-                else
-                        ret = -EIO;
-                goto out_tsk;
-
-              case PTRACE_POKETEXT:
-              case PTRACE_POKEDATA:     /* write the word at location addr */
-                ret = ia32_poke(child, addr, data);
-                goto out_tsk;
-
               case PTRACE_PEEKUSR:      /* read word at addr in USER area */
                 ret = -EIO;
                 if ((addr & 3) || addr > 17*sizeof(int))
@@ -1632,27 +1564,9 @@ sys32_ptrace (int request, pid_t pid, unsigned int addr, unsigned int data)
                                             compat_ptr(data));
                 break;
 
-              case PTRACE_GETEVENTMSG:   
-                ret = put_user(child->ptrace_message, (unsigned int __user *) compat_ptr(data));
-                break;
-
-              case PTRACE_SYSCALL:      /* continue, stop after next syscall */
-              case PTRACE_CONT:         /* restart after signal. */
-              case PTRACE_KILL:
-              case PTRACE_SINGLESTEP:   /* execute chile for one instruction */
-              case PTRACE_DETACH:       /* detach a process */
-                ret = sys_ptrace(request, pid, addr, data);
-                break;
-
               default:
-                ret = ptrace_request(child, request, addr, data);
-                break;
-
+                return compat_ptrace_request(child, request, caddr, cdata);
         }
-  out_tsk:
-        put_task_struct(child);
-  out:
-        unlock_kernel();
         return ret;
 }
 
@@ -1704,14 +1618,6 @@ out:
 }
 
 asmlinkage int
-sys32_pause (void)
-{
-        current->state = TASK_INTERRUPTIBLE;
-        schedule();
-        return -ERESTARTNOHAND;
-}
-
-asmlinkage int
 sys32_msync (unsigned int start, unsigned int len, int flags)
 {
         unsigned int addr;
diff --git a/arch/ia64/include/asm/break.h b/arch/ia64/include/asm/break.h
index f03402039896..e90c40ec9edf 100644
--- a/arch/ia64/include/asm/break.h
+++ b/arch/ia64/include/asm/break.h
@@ -20,4 +20,13 @@
  */
 #define __IA64_BREAK_SYSCALL            0x100000
 
+/*
+ * Xen specific break numbers:
+ */
+#define __IA64_XEN_HYPERCALL            0x1000
+/* [__IA64_XEN_HYPERPRIVOP_START, __IA64_XEN_HYPERPRIVOP_MAX] is used
+   for xen hyperprivops */
+#define __IA64_XEN_HYPERPRIVOP_START    0x1
+#define __IA64_XEN_HYPERPRIVOP_MAX      0x1a
+
 #endif /* _ASM_IA64_BREAK_H */
diff --git a/arch/ia64/include/asm/cacheflush.h b/arch/ia64/include/asm/cacheflush.h
index afcfbda76e20..c8ce2719fee8 100644
--- a/arch/ia64/include/asm/cacheflush.h
+++ b/arch/ia64/include/asm/cacheflush.h
@@ -34,6 +34,8 @@ do {						\
 #define flush_dcache_mmap_unlock(mapping)       do { } while (0)
 
 extern void flush_icache_range (unsigned long start, unsigned long end);
+extern void clflush_cache_range(void *addr, int size);
+
 
 #define flush_icache_user_range(vma, page, user_addr, len)                                      \
 do {                                                                                            \
diff --git a/arch/ia64/include/asm/device.h b/arch/ia64/include/asm/device.h
index 3db6daf7f251..41ab85d66f33 100644
--- a/arch/ia64/include/asm/device.h
+++ b/arch/ia64/include/asm/device.h
@@ -10,6 +10,9 @@ struct dev_archdata {
 #ifdef CONFIG_ACPI
         void    *acpi_handle;
 #endif
+#ifdef CONFIG_DMAR
+        void *iommu; /* hook for IOMMU specific extension */
+#endif
 };
 
 #endif /* _ASM_IA64_DEVICE_H */
diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index 06ff1ba21465..bbab7e2b0fc9 100644
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h
@@ -7,6 +7,49 @@
  */
 #include <asm/machvec.h>
 #include <linux/scatterlist.h>
+#include <asm/swiotlb.h>
+
+struct dma_mapping_ops {
+        int             (*mapping_error)(struct device *dev,
+                                         dma_addr_t dma_addr);
+        void*           (*alloc_coherent)(struct device *dev, size_t size,
+                                dma_addr_t *dma_handle, gfp_t gfp);
+        void            (*free_coherent)(struct device *dev, size_t size,
+                                void *vaddr, dma_addr_t dma_handle);
+        dma_addr_t      (*map_single)(struct device *hwdev, unsigned long ptr,
+                                size_t size, int direction);
+        void            (*unmap_single)(struct device *dev, dma_addr_t addr,
+                                size_t size, int direction);
+        void            (*sync_single_for_cpu)(struct device *hwdev,
+                                dma_addr_t dma_handle, size_t size,
+                                int direction);
+        void            (*sync_single_for_device)(struct device *hwdev,
+                                dma_addr_t dma_handle, size_t size,
+                                int direction);
+        void            (*sync_single_range_for_cpu)(struct device *hwdev,
+                                dma_addr_t dma_handle, unsigned long offset,
+                                size_t size, int direction);
+        void            (*sync_single_range_for_device)(struct device *hwdev,
+                                dma_addr_t dma_handle, unsigned long offset,
+                                size_t size, int direction);
+        void            (*sync_sg_for_cpu)(struct device *hwdev,
+                                struct scatterlist *sg, int nelems,
+                                int direction);
+        void            (*sync_sg_for_device)(struct device *hwdev,
+                                struct scatterlist *sg, int nelems,
+                                int direction);
+        int             (*map_sg)(struct device *hwdev, struct scatterlist *sg,
+                                int nents, int direction);
+        void            (*unmap_sg)(struct device *hwdev,
+                                struct scatterlist *sg, int nents,
+                                int direction);
+        int             (*dma_supported_op)(struct device *hwdev, u64 mask);
+        int             is_phys;
+};
+
+extern struct dma_mapping_ops *dma_ops;
+extern struct ia64_machine_vector ia64_mv;
+extern void set_iommu_machvec(void);
 
 #define dma_alloc_coherent(dev, size, handle, gfp)      \
         platform_dma_alloc_coherent(dev, size, handle, (gfp) | GFP_DMA)
@@ -96,4 +139,11 @@ dma_cache_sync (struct device *dev, void *vaddr, size_t size,
 
 #define dma_is_consistent(d, h) (1)     /* all we do is coherent memory... */
 
+static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
+{
+        return dma_ops;
+}
+
+
+
 #endif /* _ASM_IA64_DMA_MAPPING_H */
diff --git a/arch/ia64/include/asm/iommu.h b/arch/ia64/include/asm/iommu.h
new file mode 100644
index 000000000000..5fb2bb93de3b
--- /dev/null
+++ b/arch/ia64/include/asm/iommu.h
@@ -0,0 +1,16 @@
+#ifndef _ASM_IA64_IOMMU_H
+#define _ASM_IA64_IOMMU_H 1
+
+#define cpu_has_x2apic 0
+/* 10 seconds */
+#define DMAR_OPERATION_TIMEOUT (((cycles_t) local_cpu_data->itc_freq)*10)
+
+extern void pci_iommu_shutdown(void);
+extern void no_iommu_init(void);
+extern int force_iommu, no_iommu;
+extern int iommu_detected;
+extern void iommu_dma_init(void);
+extern void machvec_init(const char *name);
+extern int forbid_dac;
+
+#endif
diff --git a/arch/ia64/include/asm/kregs.h b/arch/ia64/include/asm/kregs.h
index aefcdfee7f23..39e65f6639f5 100644
--- a/arch/ia64/include/asm/kregs.h
+++ b/arch/ia64/include/asm/kregs.h
@@ -32,7 +32,7 @@
 #define IA64_TR_CURRENT_STACK   1       /* dtr1: maps kernel's memory- & register-stacks */
 
 #define IA64_TR_ALLOC_BASE      2       /* itr&dtr: Base of dynamic TR resource*/
-#define IA64_TR_ALLOC_MAX       32      /* Max number for dynamic use*/
+#define IA64_TR_ALLOC_MAX       64      /* Max number for dynamic use*/
 
 /* Processor status register bits: */
 #define IA64_PSR_BE_BIT         1
diff --git a/arch/ia64/include/asm/machvec.h b/arch/ia64/include/asm/machvec.h
index 2b850ccafef5..1ea28bcee33b 100644
--- a/arch/ia64/include/asm/machvec.h
+++ b/arch/ia64/include/asm/machvec.h
@@ -120,6 +120,8 @@ extern void machvec_tlb_migrate_finish (struct mm_struct *);
 #  include <asm/machvec_hpsim.h>
 # elif defined (CONFIG_IA64_DIG)
 #  include <asm/machvec_dig.h>
+# elif defined(CONFIG_IA64_DIG_VTD)
+#  include <asm/machvec_dig_vtd.h>
 # elif defined (CONFIG_IA64_HP_ZX1)
 #  include <asm/machvec_hpzx1.h>
 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
@@ -128,6 +130,8 @@ extern void machvec_tlb_migrate_finish (struct mm_struct *);
 #  include <asm/machvec_sn2.h>
 # elif defined (CONFIG_IA64_SGI_UV)
 #  include <asm/machvec_uv.h>
+# elif defined (CONFIG_IA64_XEN_GUEST)
+#  include <asm/machvec_xen.h>
 # elif defined (CONFIG_IA64_GENERIC)
 
 # ifdef MACHVEC_PLATFORM_HEADER
diff --git a/arch/ia64/include/asm/machvec_dig_vtd.h b/arch/ia64/include/asm/machvec_dig_vtd.h
new file mode 100644
index 000000000000..3400b561e711
--- /dev/null
+++ b/arch/ia64/include/asm/machvec_dig_vtd.h
@@ -0,0 +1,38 @@
+#ifndef _ASM_IA64_MACHVEC_DIG_VTD_h
+#define _ASM_IA64_MACHVEC_DIG_VTD_h
+
+extern ia64_mv_setup_t                  dig_setup;
+extern ia64_mv_dma_alloc_coherent       vtd_alloc_coherent;
+extern ia64_mv_dma_free_coherent        vtd_free_coherent;
+extern ia64_mv_dma_map_single_attrs     vtd_map_single_attrs;
+extern ia64_mv_dma_unmap_single_attrs   vtd_unmap_single_attrs;
+extern ia64_mv_dma_map_sg_attrs         vtd_map_sg_attrs;
+extern ia64_mv_dma_unmap_sg_attrs       vtd_unmap_sg_attrs;
+extern ia64_mv_dma_supported            iommu_dma_supported;
+extern ia64_mv_dma_mapping_error        vtd_dma_mapping_error;
+extern ia64_mv_dma_init                 pci_iommu_alloc;
+
+/*
+ * This stuff has dual use!
+ *
+ * For a generic kernel, the macros are used to initialize the
+ * platform's machvec structure.  When compiling a non-generic kernel,
+ * the macros are used directly.
+ */
+#define platform_name                           "dig_vtd"
+#define platform_setup                          dig_setup
+#define platform_dma_init                       pci_iommu_alloc
+#define platform_dma_alloc_coherent             vtd_alloc_coherent
+#define platform_dma_free_coherent              vtd_free_coherent
+#define platform_dma_map_single_attrs           vtd_map_single_attrs
+#define platform_dma_unmap_single_attrs         vtd_unmap_single_attrs
+#define platform_dma_map_sg_attrs               vtd_map_sg_attrs
+#define platform_dma_unmap_sg_attrs             vtd_unmap_sg_attrs
+#define platform_dma_sync_single_for_cpu        machvec_dma_sync_single
+#define platform_dma_sync_sg_for_cpu            machvec_dma_sync_sg
+#define platform_dma_sync_single_for_device     machvec_dma_sync_single
+#define platform_dma_sync_sg_for_device         machvec_dma_sync_sg
+#define platform_dma_supported                  iommu_dma_supported
+#define platform_dma_mapping_error              vtd_dma_mapping_error
+
+#endif /* _ASM_IA64_MACHVEC_DIG_VTD_h */
diff --git a/arch/ia64/include/asm/machvec_init.h b/arch/ia64/include/asm/machvec_init.h
index 7f21249fba3f..ef964b286842 100644
--- a/arch/ia64/include/asm/machvec_init.h
+++ b/arch/ia64/include/asm/machvec_init.h
@@ -1,3 +1,4 @@
+#include <asm/iommu.h>
 #include <asm/machvec.h>
 
 extern ia64_mv_send_ipi_t ia64_send_ipi;
diff --git a/arch/ia64/include/asm/machvec_xen.h b/arch/ia64/include/asm/machvec_xen.h
new file mode 100644
index 000000000000..55f9228056cd
--- /dev/null
+++ b/arch/ia64/include/asm/machvec_xen.h
@@ -0,0 +1,22 @@
+#ifndef _ASM_IA64_MACHVEC_XEN_h
+#define _ASM_IA64_MACHVEC_XEN_h
+
+extern ia64_mv_setup_t                  dig_setup;
+extern ia64_mv_cpu_init_t               xen_cpu_init;
+extern ia64_mv_irq_init_t               xen_irq_init;
+extern ia64_mv_send_ipi_t               xen_platform_send_ipi;
+
+/*
+ * This stuff has dual use!
+ *
+ * For a generic kernel, the macros are used to initialize the
+ * platform's machvec structure.  When compiling a non-generic kernel,
+ * the macros are used directly.
+ */
+#define platform_name                           "xen"
+#define platform_setup                          dig_setup
+#define platform_cpu_init                       xen_cpu_init
+#define platform_irq_init                       xen_irq_init
+#define platform_send_ipi                       xen_platform_send_ipi
+
+#endif /* _ASM_IA64_MACHVEC_XEN_h */
diff --git a/arch/ia64/include/asm/meminit.h b/arch/ia64/include/asm/meminit.h
index 7245a5781594..6bc96ee54327 100644
--- a/arch/ia64/include/asm/meminit.h
+++ b/arch/ia64/include/asm/meminit.h
@@ -18,10 +18,11 @@
  *      - crash dumping code reserved region
  *      - Kernel memory map built from EFI memory map
  *      - ELF core header
+ *      - xen start info if CONFIG_XEN
  *
  * More could be added if necessary
  */
-#define IA64_MAX_RSVD_REGIONS 8
+#define IA64_MAX_RSVD_REGIONS 9
 
 struct rsvd_region {
         unsigned long start;    /* virtual address of beginning of element */
diff --git a/arch/ia64/include/asm/native/inst.h b/arch/ia64/include/asm/native/inst.h
index c8efbf7b849e..0a1026cca4fa 100644
--- a/arch/ia64/include/asm/native/inst.h
+++ b/arch/ia64/include/asm/native/inst.h
@@ -36,8 +36,13 @@
         ;;                                      \
         movl clob = PARAVIRT_POISON;            \
         ;;
+# define CLOBBER_PRED(pred_clob)                \
+        ;;                                      \
+        cmp.eq pred_clob, p0 = r0, r0           \
+        ;;
 #else
-# define CLOBBER(clob)          /* nothing */
+# define CLOBBER(clob)                  /* nothing */
+# define CLOBBER_PRED(pred_clob)        /* nothing */
 #endif
 
 #define MOV_FROM_IFA(reg)       \
@@ -136,7 +141,8 @@
 
 #define SSM_PSR_I(pred, pred_clob, clob)        \
 (pred)  ssm psr.i                               \
-        CLOBBER(clob)
+        CLOBBER(clob)                           \
+        CLOBBER_PRED(pred_clob)
 
 #define RSM_PSR_I(pred, clob0, clob1)   \
 (pred)  rsm psr.i                       \
diff --git a/arch/ia64/include/asm/native/pvchk_inst.h b/arch/ia64/include/asm/native/pvchk_inst.h
new file mode 100644
index 000000000000..b8e6eb1090d7
--- /dev/null
+++ b/arch/ia64/include/asm/native/pvchk_inst.h
@@ -0,0 +1,263 @@
+#ifndef _ASM_NATIVE_PVCHK_INST_H
+#define _ASM_NATIVE_PVCHK_INST_H
+
+/******************************************************************************
+ * arch/ia64/include/asm/native/pvchk_inst.h
+ * Checker for paravirtualizations of privileged operations.
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *      Dan Magenheimer <dan.magenheimer@hp.com>
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/**********************************************
+ * Instructions paravirtualized for correctness
+ **********************************************/
+
+/* "fc" and "thash" are privilege-sensitive instructions, meaning they
+ *  may have different semantics depending on whether they are executed
+ *  at PL0 vs PL!=0.  When paravirtualized, these instructions mustn't
+ *  be allowed to execute directly, lest incorrect semantics result.
+ */
+
+#define fc      .error "fc should not be used directly."
+#define thash   .error "thash should not be used directly."
+
+/* Note that "ttag" and "cover" are also privilege-sensitive; "ttag"
+ * is not currently used (though it may be in a long-format VHPT system!)
+ * and the semantics of cover only change if psr.ic is off which is very
+ * rare (and currently non-existent outside of assembly code
+ */
+#define ttag    .error "ttag should not be used directly."
+#define cover   .error "cover should not be used directly."
+
+/* There are also privilege-sensitive registers.  These registers are
+ * readable at any privilege level but only writable at PL0.
+ */
+#define cpuid   .error "cpuid should not be used directly."
+#define pmd     .error "pmd should not be used directly."
+
+/*
+ * mov ar.eflag =
+ * mov = ar.eflag
+ */
+
+/**********************************************
+ * Instructions paravirtualized for performance
+ **********************************************/
+/*
+ * Those instructions include '.' which can't be handled by cpp.
+ * or can't be handled by cpp easily.
+ * They are handled by sed instead of cpp.
+ */
+
+/* for .S
+ * itc.i
+ * itc.d
+ *
+ * bsw.0
+ * bsw.1
+ *
+ * ssm psr.ic | PSR_DEFAULT_BITS
+ * ssm psr.ic
+ * rsm psr.ic
+ * ssm psr.i
+ * rsm psr.i
+ * rsm psr.i | psr.ic
+ * rsm psr.dt
+ * ssm psr.dt
+ *
+ * mov = cr.ifa
+ * mov = cr.itir
+ * mov = cr.isr
+ * mov = cr.iha
+ * mov = cr.ipsr
+ * mov = cr.iim
+ * mov = cr.iip
+ * mov = cr.ivr
+ * mov = psr
+ *
+ * mov cr.ifa =
+ * mov cr.itir =
+ * mov cr.iha =
+ * mov cr.ipsr =
+ * mov cr.ifs =
+ * mov cr.iip =
+ * mov cr.kr =
+ */
+
+/* for intrinsics
+ * ssm psr.i
+ * rsm psr.i
+ * mov = psr
+ * mov = ivr
+ * mov = tpr
+ * mov cr.itm =
+ * mov eoi =
+ * mov rr[] =
+ * mov = rr[]
+ * mov = kr
+ * mov kr =
+ * ptc.ga
+ */
+
+/*************************************************************
+ * define paravirtualized instrcution macros as nop to ingore.
+ * and check whether arguments are appropriate.
+ *************************************************************/
+
+/* check whether reg is a regular register */
+.macro is_rreg_in reg
+        .ifc "\reg", "r0"
+                nop 0
+                .exitm
+        .endif
+        ;;
+        mov \reg = r0
+        ;;
+.endm
+#define IS_RREG_IN(reg) is_rreg_in reg ;
+
+#define IS_RREG_OUT(reg)                        \
+        ;;                                      \
+        mov reg = r0                            \
+        ;;
+
+#define IS_RREG_CLOB(reg)       IS_RREG_OUT(reg)
+
+/* check whether pred is a predicate register */
+#define IS_PRED_IN(pred)                        \
+        ;;                                      \
+        (pred)  nop 0                           \
+        ;;
+
+#define IS_PRED_OUT(pred)                       \
+        ;;                                      \
+        cmp.eq pred, p0 = r0, r0                \
+        ;;
+
+#define IS_PRED_CLOB(pred)      IS_PRED_OUT(pred)
+
+
+#define DO_SAVE_MIN(__COVER, SAVE_IFS, EXTRA, WORKAROUND)       \
+        nop 0
+#define MOV_FROM_IFA(reg)                       \
+        IS_RREG_OUT(reg)
+#define MOV_FROM_ITIR(reg)                      \
+        IS_RREG_OUT(reg)
+#define MOV_FROM_ISR(reg)                       \
+        IS_RREG_OUT(reg)
+#define MOV_FROM_IHA(reg)                       \
+        IS_RREG_OUT(reg)
+#define MOV_FROM_IPSR(pred, reg)                \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_OUT(reg)
+#define MOV_FROM_IIM(reg)                       \
+        IS_RREG_OUT(reg)
+#define MOV_FROM_IIP(reg)                       \
+        IS_RREG_OUT(reg)
+#define MOV_FROM_IVR(reg, clob)                 \
+        IS_RREG_OUT(reg)                        \
+        IS_RREG_CLOB(clob)
+#define MOV_FROM_PSR(pred, reg, clob)           \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_OUT(reg)                        \
+        IS_RREG_CLOB(clob)
+#define MOV_TO_IFA(reg, clob)                   \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define MOV_TO_ITIR(pred, reg, clob)            \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define MOV_TO_IHA(pred, reg, clob)             \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define MOV_TO_IPSR(pred, reg, clob)            \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define MOV_TO_IFS(pred, reg, clob)             \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define MOV_TO_IIP(reg, clob)                   \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define MOV_TO_KR(kr, reg, clob0, clob1)        \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob0)                     \
+        IS_RREG_CLOB(clob1)
+#define ITC_I(pred, reg, clob)                  \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define ITC_D(pred, reg, clob)                  \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define ITC_I_AND_D(pred_i, pred_d, reg, clob)  \
+        IS_PRED_IN(pred_i)                      \
+        IS_PRED_IN(pred_d)                      \
+        IS_RREG_IN(reg)                         \
+        IS_RREG_CLOB(clob)
+#define THASH(pred, reg0, reg1, clob)           \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_OUT(reg0)                       \
+        IS_RREG_IN(reg1)                        \
+        IS_RREG_CLOB(clob)
+#define SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(clob0, clob1)    \
+        IS_RREG_CLOB(clob0)                                     \
+        IS_RREG_CLOB(clob1)
+#define SSM_PSR_IC_AND_SRLZ_D(clob0, clob1)     \
+        IS_RREG_CLOB(clob0)                     \
+        IS_RREG_CLOB(clob1)
+#define RSM_PSR_IC(clob)                        \
+        IS_RREG_CLOB(clob)
+#define SSM_PSR_I(pred, pred_clob, clob)        \
+        IS_PRED_IN(pred)                        \
+        IS_PRED_CLOB(pred_clob)                 \
+        IS_RREG_CLOB(clob)
+#define RSM_PSR_I(pred, clob0, clob1)           \
+        IS_PRED_IN(pred)                        \
+        IS_RREG_CLOB(clob0)                     \
+        IS_RREG_CLOB(clob1)
+#define RSM_PSR_I_IC(clob0, clob1, clob2)       \
+        IS_RREG_CLOB(clob0)                     \
+        IS_RREG_CLOB(clob1)                     \
+        IS_RREG_CLOB(clob2)
+#define RSM_PSR_DT                              \
+        nop 0
+#define SSM_PSR_DT_AND_SRLZ_I                   \
+        nop 0
+#define BSW_0(clob0, clob1, clob2)              \
+        IS_RREG_CLOB(clob0)                     \
+        IS_RREG_CLOB(clob1)                     \
+        IS_RREG_CLOB(clob2)
+#define BSW_1(clob0, clob1)                     \
+        IS_RREG_CLOB(clob0)                     \
+        IS_RREG_CLOB(clob1)
+#define COVER                                   \
+        nop 0
+#define RFI                                     \
+        br.ret.sptk.many rp /* defining nop causes dependency error */
+
+#endif /* _ASM_NATIVE_PVCHK_INST_H */
diff --git a/arch/ia64/include/asm/paravirt.h b/arch/ia64/include/asm/paravirt.h
index 660cab044834..2bf3636473fe 100644
--- a/arch/ia64/include/asm/paravirt.h
+++ b/arch/ia64/include/asm/paravirt.h
@@ -117,7 +117,7 @@ static inline void paravirt_post_smp_prepare_boot_cpu(void)
 struct pv_iosapic_ops {
         void (*pcat_compat_init)(void);
 
-        struct irq_chip *(*get_irq_chip)(unsigned long trigger);
+        struct irq_chip *(*__get_irq_chip)(unsigned long trigger);
 
         unsigned int (*__read)(char __iomem *iosapic, unsigned int reg);
         void (*__write)(char __iomem *iosapic, unsigned int reg, u32 val);
@@ -135,7 +135,7 @@ iosapic_pcat_compat_init(void)
 static inline struct irq_chip*
 iosapic_get_irq_chip(unsigned long trigger)
 {
-        return pv_iosapic_ops.get_irq_chip(trigger);
+        return pv_iosapic_ops.__get_irq_chip(trigger);
 }
 
 static inline unsigned int
diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
index ce342fb74246..1d660d89db0d 100644
--- a/arch/ia64/include/asm/pci.h
+++ b/arch/ia64/include/asm/pci.h
@@ -156,4 +156,7 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
         return channel ? isa_irq_to_vector(15) : isa_irq_to_vector(14);
 }
 
+#ifdef CONFIG_DMAR
+extern void pci_iommu_alloc(void);
+#endif
 #endif /* _ASM_IA64_PCI_H */
diff --git a/arch/ia64/include/asm/ptrace.h b/arch/ia64/include/asm/ptrace.h
index 15f8dcfe6eee..6417c1ecb44e 100644
--- a/arch/ia64/include/asm/ptrace.h
+++ b/arch/ia64/include/asm/ptrace.h
@@ -240,6 +240,12 @@ struct switch_stack {
  */
 # define instruction_pointer(regs) ((regs)->cr_iip + ia64_psr(regs)->ri)
 
+static inline unsigned long user_stack_pointer(struct pt_regs *regs)
+{
+        /* FIXME: should this be bspstore + nr_dirty regs? */
+        return regs->ar_bspstore;
+}
+
 #define regs_return_value(regs) ((regs)->r8)
 
 /* Conserve space in histogram by encoding slot bits in address
@@ -319,6 +325,8 @@ struct switch_stack {
   #define arch_has_block_step()   (1)
   extern void user_enable_block_step(struct task_struct *);
 
+#define __ARCH_WANT_COMPAT_SYS_PTRACE
+
 #endif /* !__KERNEL__ */
 
 /* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
diff --git a/arch/ia64/include/asm/pvclock-abi.h b/arch/ia64/include/asm/pvclock-abi.h
new file mode 100644
index 000000000000..44ef9ef8f5b3
--- /dev/null
+++ b/arch/ia64/include/asm/pvclock-abi.h
@@ -0,0 +1,48 @@
+/*
+ * same structure to x86's
+ * Hopefully asm-x86/pvclock-abi.h would be moved to somewhere more generic.
+ * For now, define same duplicated definitions.
+ */
+
+#ifndef _ASM_IA64__PVCLOCK_ABI_H
+#define _ASM_IA64__PVCLOCK_ABI_H
+#ifndef __ASSEMBLY__
+
+/*
+ * These structs MUST NOT be changed.
+ * They are the ABI between hypervisor and guest OS.
+ * Both Xen and KVM are using this.
+ *
+ * pvclock_vcpu_time_info holds the system time and the tsc timestamp
+ * of the last update. So the guest can use the tsc delta to get a
+ * more precise system time.  There is one per virtual cpu.
+ *
+ * pvclock_wall_clock references the point in time when the system
+ * time was zero (usually boot time), thus the guest calculates the
+ * current wall clock by adding the system time.
+ *
+ * Protocol for the "version" fields is: hypervisor raises it (making
+ * it uneven) before it starts updating the fields and raises it again
+ * (making it even) when it is done.  Thus the guest can make sure the
+ * time values it got are consistent by checking the version before
+ * and after reading them.
+ */
+
+struct pvclock_vcpu_time_info {
+        u32   version;
+        u32   pad0;
+        u64   tsc_timestamp;
+        u64   system_time;
+        u32   tsc_to_system_mul;
+        s8    tsc_shift;
+        u8    pad[3];
+} __attribute__((__packed__)); /* 32 bytes */
+
+struct pvclock_wall_clock {
+        u32   version;
+        u32   sec;
+        u32   nsec;
+} __attribute__((__packed__));
+
+#endif /* __ASSEMBLY__ */
+#endif /* _ASM_IA64__PVCLOCK_ABI_H */
diff --git a/arch/ia64/include/asm/swiotlb.h b/arch/ia64/include/asm/swiotlb.h
new file mode 100644
index 000000000000..fb79423834d0
--- /dev/null
+++ b/arch/ia64/include/asm/swiotlb.h
@@ -0,0 +1,56 @@
+#ifndef ASM_IA64__SWIOTLB_H
+#define ASM_IA64__SWIOTLB_H
+
+#include <linux/dma-mapping.h>
+
+/* SWIOTLB interface */
+
+extern dma_addr_t swiotlb_map_single(struct device *hwdev, void *ptr,
+                                     size_t size, int dir);
+extern void *swiotlb_alloc_coherent(struct device *hwdev, size_t size,
+                                    dma_addr_t *dma_handle, gfp_t flags);
+extern void swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
+                                 size_t size, int dir);
+extern void swiotlb_sync_single_for_cpu(struct device *hwdev,
+                                        dma_addr_t dev_addr,
+                                        size_t size, int dir);
+extern void swiotlb_sync_single_for_device(struct device *hwdev,
+                                           dma_addr_t dev_addr,
+                                           size_t size, int dir);
+extern void swiotlb_sync_single_range_for_cpu(struct device *hwdev,
+                                              dma_addr_t dev_addr,
+                                              unsigned long offset,
+                                              size_t size, int dir);
+extern void swiotlb_sync_single_range_for_device(struct device *hwdev,
+                                                 dma_addr_t dev_addr,
+                                                 unsigned long offset,
+                                                 size_t size, int dir);
+extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,
+                                    struct scatterlist *sg, int nelems,
+                                    int dir);
+extern void swiotlb_sync_sg_for_device(struct device *hwdev,
+                                       struct scatterlist *sg, int nelems,
+                                       int dir);
+extern int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg,
+                          int nents, int direction);
+extern void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg,
+                             int nents, int direction);
+extern int swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
+extern void swiotlb_free_coherent(struct device *hwdev, size_t size,
+                                  void *vaddr, dma_addr_t dma_handle);
+extern int swiotlb_dma_supported(struct device *hwdev, u64 mask);
+extern void swiotlb_init(void);
+
+extern int swiotlb_force;
+
+#ifdef CONFIG_SWIOTLB
+extern int swiotlb;
+extern void pci_swiotlb_init(void);
+#else
+#define swiotlb 0
+static inline void pci_swiotlb_init(void)
+{
+}
+#endif
+
+#endif /* ASM_IA64__SWIOTLB_H */
diff --git a/arch/ia64/include/asm/sync_bitops.h b/arch/ia64/include/asm/sync_bitops.h
new file mode 100644
index 000000000000..593c12eeb270
--- /dev/null
+++ b/arch/ia64/include/asm/sync_bitops.h
@@ -0,0 +1,51 @@
+#ifndef _ASM_IA64_SYNC_BITOPS_H
+#define _ASM_IA64_SYNC_BITOPS_H
+
+/*
+ * Copyright (C) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *
+ * Based on synch_bitops.h which Dan Magenhaimer wrote.
+ *
+ * bit operations which provide guaranteed strong synchronisation
+ * when communicating with Xen or other guest OSes running on other CPUs.
+ */
+
+static inline void sync_set_bit(int nr, volatile void *addr)
+{
+        set_bit(nr, addr);
+}
+
+static inline void sync_clear_bit(int nr, volatile void *addr)
+{
+        clear_bit(nr, addr);
+}
+
+static inline void sync_change_bit(int nr, volatile void *addr)
+{
+        change_bit(nr, addr);
+}
+
+static inline int sync_test_and_set_bit(int nr, volatile void *addr)
+{
+        return test_and_set_bit(nr, addr);
+}
+
+static inline int sync_test_and_clear_bit(int nr, volatile void *addr)
+{
+        return test_and_clear_bit(nr, addr);
+}
+
+static inline int sync_test_and_change_bit(int nr, volatile void *addr)
+{
+        return test_and_change_bit(nr, addr);
+}
+
+static inline int sync_test_bit(int nr, const volatile void *addr)
+{
+        return test_bit(nr, addr);
+}
+
+#define sync_cmpxchg(ptr, old, new)                             \
+        ((__typeof__(*(ptr)))cmpxchg_acq((ptr), (old), (new)))
+
+#endif /* _ASM_IA64_SYNC_BITOPS_H */
diff --git a/arch/ia64/include/asm/syscall.h b/arch/ia64/include/asm/syscall.h
new file mode 100644
index 000000000000..2f758a42f94b
--- /dev/null
+++ b/arch/ia64/include/asm/syscall.h
@@ -0,0 +1,163 @@
+/*
+ * Access to user system call parameters and results
+ *
+ * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ *
+ * See asm-generic/syscall.h for descriptions of what we must do here.
+ */
+
+#ifndef _ASM_SYSCALL_H
+#define _ASM_SYSCALL_H  1
+
+#include <linux/sched.h>
+#include <linux/err.h>
+
+static inline long syscall_get_nr(struct task_struct *task,
+                                  struct pt_regs *regs)
+{
+        if ((long)regs->cr_ifs < 0) /* Not a syscall */
+                return -1;
+
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                return regs->r1;
+#endif
+
+        return regs->r15;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+                                    struct pt_regs *regs)
+{
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                regs->r8 = regs->r1;
+#endif
+
+        /* do nothing */
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+                                     struct pt_regs *regs)
+{
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs))
+                return regs->r8;
+#endif
+
+        return regs->r10 == -1 ? regs->r8:0;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+                                            struct pt_regs *regs)
+{
+        return regs->r8;
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+                                            struct pt_regs *regs,
+                                            int error, long val)
+{
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                regs->r8 = (long) error ? error : val;
+                return;
+        }
+#endif
+
+        if (error) {
+                /* error < 0, but ia64 uses > 0 return value */
+                regs->r8 = -error;
+                regs->r10 = -1;
+        } else {
+                regs->r8 = val;
+                regs->r10 = 0;
+        }
+}
+
+extern void ia64_syscall_get_set_arguments(struct task_struct *task,
+        struct pt_regs *regs, unsigned int i, unsigned int n,
+        unsigned long *args, int rw);
+static inline void syscall_get_arguments(struct task_struct *task,
+                                         struct pt_regs *regs,
+                                         unsigned int i, unsigned int n,
+                                         unsigned long *args)
+{
+        BUG_ON(i + n > 6);
+
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                switch (i + n) {
+                case 6:
+                        if (!n--) break;
+                        *args++ = regs->r13;
+                case 5:
+                        if (!n--) break;
+                        *args++ = regs->r15;
+                case 4:
+                        if (!n--) break;
+                        *args++ = regs->r14;
+                case 3:
+                        if (!n--) break;
+                        *args++ = regs->r10;
+                case 2:
+                        if (!n--) break;
+                        *args++ = regs->r9;
+                case 1:
+                        if (!n--) break;
+                        *args++ = regs->r11;
+                case 0:
+                        if (!n--) break;
+                default:
+                        BUG();
+                        break;
+                }
+
+                return;
+        }
+#endif
+        ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
+}
+
+static inline void syscall_set_arguments(struct task_struct *task,
+                                         struct pt_regs *regs,
+                                         unsigned int i, unsigned int n,
+                                         unsigned long *args)
+{
+        BUG_ON(i + n > 6);
+
+#ifdef CONFIG_IA32_SUPPORT
+        if (IS_IA32_PROCESS(regs)) {
+                switch (i + n) {
+                case 6:
+                        if (!n--) break;
+                        regs->r13 = *args++;
+                case 5:
+                        if (!n--) break;
+                        regs->r15 = *args++;
+                case 4:
+                        if (!n--) break;
+                        regs->r14 = *args++;
+                case 3:
+                        if (!n--) break;
+                        regs->r10 = *args++;
+                case 2:
+                        if (!n--) break;
+                        regs->r9 = *args++;
+                case 1:
+                        if (!n--) break;
+                        regs->r11 = *args++;
+                case 0:
+                        if (!n--) break;
+                }
+
+                return;
+        }
+#endif
+        ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
+}
+#endif  /* _ASM_SYSCALL_H */
diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h
index 7c60fcdd2efd..ae6922626bf4 100644
--- a/arch/ia64/include/asm/thread_info.h
+++ b/arch/ia64/include/asm/thread_info.h
@@ -87,9 +87,6 @@ struct thread_info {
 #define alloc_task_struct()     ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
 #define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
 
-#define tsk_set_notify_resume(tsk) \
-        set_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME)
-extern void tsk_clear_notify_resume(struct task_struct *tsk);
 #endif /* !__ASSEMBLY */
 
 /*
diff --git a/arch/ia64/include/asm/timex.h b/arch/ia64/include/asm/timex.h
index 05a6baf8a472..4e03cfe74a0c 100644
--- a/arch/ia64/include/asm/timex.h
+++ b/arch/ia64/include/asm/timex.h
@@ -39,4 +39,6 @@ get_cycles (void)
         return ret;
 }
 
+extern void ia64_cpu_local_tick (void);
+
 #endif /* _ASM_IA64_TIMEX_H */
diff --git a/arch/ia64/include/asm/unistd.h b/arch/ia64/include/asm/unistd.h
index d535833aab5e..f791576355ad 100644
--- a/arch/ia64/include/asm/unistd.h
+++ b/arch/ia64/include/asm/unistd.h
@@ -337,6 +337,7 @@
 # define __ARCH_WANT_SYS_NICE
 # define __ARCH_WANT_SYS_OLD_GETRLIMIT
 # define __ARCH_WANT_SYS_OLDUMOUNT
+# define __ARCH_WANT_SYS_PAUSE
 # define __ARCH_WANT_SYS_SIGPENDING
 # define __ARCH_WANT_SYS_SIGPROCMASK
 # define __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
diff --git a/arch/ia64/include/asm/xen/events.h b/arch/ia64/include/asm/xen/events.h
new file mode 100644
index 000000000000..73248781fba8
--- /dev/null
+++ b/arch/ia64/include/asm/xen/events.h
@@ -0,0 +1,50 @@
+/******************************************************************************
+ * arch/ia64/include/asm/xen/events.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+#ifndef _ASM_IA64_XEN_EVENTS_H
+#define _ASM_IA64_XEN_EVENTS_H
+
+enum ipi_vector {
+        XEN_RESCHEDULE_VECTOR,
+        XEN_IPI_VECTOR,
+        XEN_CMCP_VECTOR,
+        XEN_CPEP_VECTOR,
+
+        XEN_NR_IPIS,
+};
+
+static inline int xen_irqs_disabled(struct pt_regs *regs)
+{
+        return !(ia64_psr(regs)->i);
+}
+
+static inline void xen_do_IRQ(int irq, struct pt_regs *regs)
+{
+        struct pt_regs *old_regs;
+        old_regs = set_irq_regs(regs);
+        irq_enter();
+        __do_IRQ(irq);
+        irq_exit();
+        set_irq_regs(old_regs);
+}
+#define irq_ctx_init(cpu)       do { } while (0)
+
+#endif /* _ASM_IA64_XEN_EVENTS_H */
diff --git a/arch/ia64/include/asm/xen/grant_table.h b/arch/ia64/include/asm/xen/grant_table.h
new file mode 100644
index 000000000000..2b1fae0e2d11
--- /dev/null
+++ b/arch/ia64/include/asm/xen/grant_table.h
@@ -0,0 +1,29 @@
+/******************************************************************************
+ * arch/ia64/include/asm/xen/grant_table.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef _ASM_IA64_XEN_GRANT_TABLE_H
+#define _ASM_IA64_XEN_GRANT_TABLE_H
+
+struct vm_struct *xen_alloc_vm_area(unsigned long size);
+void xen_free_vm_area(struct vm_struct *area);
+
+#endif /* _ASM_IA64_XEN_GRANT_TABLE_H */
diff --git a/arch/ia64/include/asm/xen/hypercall.h b/arch/ia64/include/asm/xen/hypercall.h
new file mode 100644
index 000000000000..96fc62366aa4
--- /dev/null
+++ b/arch/ia64/include/asm/xen/hypercall.h
@@ -0,0 +1,265 @@
+/******************************************************************************
+ * hypercall.h
+ *
+ * Linux-specific hypervisor handling.
+ *
+ * Copyright (c) 2002-2004, K A Fraser
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _ASM_IA64_XEN_HYPERCALL_H
+#define _ASM_IA64_XEN_HYPERCALL_H
+
+#include <xen/interface/xen.h>
+#include <xen/interface/physdev.h>
+#include <xen/interface/sched.h>
+#include <asm/xen/xcom_hcall.h>
+struct xencomm_handle;
+extern unsigned long __hypercall(unsigned long a1, unsigned long a2,
+                                 unsigned long a3, unsigned long a4,
+                                 unsigned long a5, unsigned long cmd);
+
+/*
+ * Assembler stubs for hyper-calls.
+ */
+
+#define _hypercall0(type, name)                                 \
+({                                                              \
+        long __res;                                             \
+        __res = __hypercall(0, 0, 0, 0, 0, __HYPERVISOR_##name);\
+        (type)__res;                                            \
+})
+
+#define _hypercall1(type, name, a1)                             \
+({                                                              \
+        long __res;                                             \
+        __res = __hypercall((unsigned long)a1,                  \
+                             0, 0, 0, 0, __HYPERVISOR_##name);  \
+        (type)__res;                                            \
+})
+
+#define _hypercall2(type, name, a1, a2)                         \
+({                                                              \
+        long __res;                                             \
+        __res = __hypercall((unsigned long)a1,                  \
+                            (unsigned long)a2,                  \
+                            0, 0, 0, __HYPERVISOR_##name);      \
+        (type)__res;                                            \
+})
+
+#define _hypercall3(type, name, a1, a2, a3)                     \
+({                                                              \
+        long __res;                                             \
+        __res = __hypercall((unsigned long)a1,                  \
+                            (unsigned long)a2,                  \
+                            (unsigned long)a3,                  \
+                            0, 0, __HYPERVISOR_##name);         \
+        (type)__res;                                            \
+})
+
+#define _hypercall4(type, name, a1, a2, a3, a4)                 \
+({                                                              \
+        long __res;                                             \
+        __res = __hypercall((unsigned long)a1,                  \
+                            (unsigned long)a2,                  \
+                            (unsigned long)a3,                  \
+                            (unsigned long)a4,                  \
+                            0, __HYPERVISOR_##name);            \
+        (type)__res;                                            \
+})
+
+#define _hypercall5(type, name, a1, a2, a3, a4, a5)             \
+({                                                              \
+        long __res;                                             \
+        __res = __hypercall((unsigned long)a1,                  \
+                            (unsigned long)a2,                  \
+                            (unsigned long)a3,                  \
+                            (unsigned long)a4,                  \
+                            (unsigned long)a5,                  \
+                            __HYPERVISOR_##name);               \
+        (type)__res;                                            \
+})
+
+
+static inline int
+xencomm_arch_hypercall_sched_op(int cmd, struct xencomm_handle *arg)
+{
+        return _hypercall2(int, sched_op_new, cmd, arg);
+}
+
+static inline long
+HYPERVISOR_set_timer_op(u64 timeout)
+{
+        unsigned long timeout_hi = (unsigned long)(timeout >> 32);
+        unsigned long timeout_lo = (unsigned long)timeout;
+        return _hypercall2(long, set_timer_op, timeout_lo, timeout_hi);
+}
+
+static inline int
+xencomm_arch_hypercall_multicall(struct xencomm_handle *call_list,
+                                 int nr_calls)
+{
+        return _hypercall2(int, multicall, call_list, nr_calls);
+}
+
+static inline int
+xencomm_arch_hypercall_memory_op(unsigned int cmd, struct xencomm_handle *arg)
+{
+        return _hypercall2(int, memory_op, cmd, arg);
+}
+
+static inline int
+xencomm_arch_hypercall_event_channel_op(int cmd, struct xencomm_handle *arg)
+{
+        return _hypercall2(int, event_channel_op, cmd, arg);
+}
+
+static inline int
+xencomm_arch_hypercall_xen_version(int cmd, struct xencomm_handle *arg)
+{
+        return _hypercall2(int, xen_version, cmd, arg);
+}
+
+static inline int
+xencomm_arch_hypercall_console_io(int cmd, int count,
+                                  struct xencomm_handle *str)
+{
+        return _hypercall3(int, console_io, cmd, count, str);
+}
+
+static inline int
+xencomm_arch_hypercall_physdev_op(int cmd, struct xencomm_handle *arg)
+{
+        return _hypercall2(int, physdev_op, cmd, arg);
+}
+
+static inline int
+xencomm_arch_hypercall_grant_table_op(unsigned int cmd,
+                                      struct xencomm_handle *uop,
+                                      unsigned int count)
+{
+        return _hypercall3(int, grant_table_op, cmd, uop, count);
+}
+
+int HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count);
+
+extern int xencomm_arch_hypercall_suspend(struct xencomm_handle *arg);
+
+static inline int
+xencomm_arch_hypercall_callback_op(int cmd, struct xencomm_handle *arg)
+{
+        return _hypercall2(int, callback_op, cmd, arg);
+}
+
+static inline long
+xencomm_arch_hypercall_vcpu_op(int cmd, int cpu, void *arg)
+{
+        return _hypercall3(long, vcpu_op, cmd, cpu, arg);
+}
+
+static inline int
+HYPERVISOR_physdev_op(int cmd, void *arg)
+{
+        switch (cmd) {
+        case PHYSDEVOP_eoi:
+                return _hypercall1(int, ia64_fast_eoi,
+                                   ((struct physdev_eoi *)arg)->irq);
+        default:
+                return xencomm_hypercall_physdev_op(cmd, arg);
+        }
+}
+
+static inline long
+xencomm_arch_hypercall_opt_feature(struct xencomm_handle *arg)
+{
+        return _hypercall1(long, opt_feature, arg);
+}
+
+/* for balloon driver */
+#define HYPERVISOR_update_va_mapping(va, new_val, flags) (0)
+
+/* Use xencomm to do hypercalls.  */
+#define HYPERVISOR_sched_op xencomm_hypercall_sched_op
+#define HYPERVISOR_event_channel_op xencomm_hypercall_event_channel_op
+#define HYPERVISOR_callback_op xencomm_hypercall_callback_op
+#define HYPERVISOR_multicall xencomm_hypercall_multicall
+#define HYPERVISOR_xen_version xencomm_hypercall_xen_version
+#define HYPERVISOR_console_io xencomm_hypercall_console_io
+#define HYPERVISOR_memory_op xencomm_hypercall_memory_op
+#define HYPERVISOR_suspend xencomm_hypercall_suspend
+#define HYPERVISOR_vcpu_op xencomm_hypercall_vcpu_op
+#define HYPERVISOR_opt_feature xencomm_hypercall_opt_feature
+
+/* to compile gnttab_copy_grant_page() in drivers/xen/core/gnttab.c */
+#define HYPERVISOR_mmu_update(req, count, success_count, domid) ({ BUG(); 0; })
+
+static inline int
+HYPERVISOR_shutdown(
+        unsigned int reason)
+{
+        struct sched_shutdown sched_shutdown = {
+                .reason = reason
+        };
+
+        int rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
+
+        return rc;
+}
+
+/* for netfront.c, netback.c */
+#define MULTI_UVMFLAGS_INDEX 0 /* XXX any value */
+
+static inline void
+MULTI_update_va_mapping(
+        struct multicall_entry *mcl, unsigned long va,
+        pte_t new_val, unsigned long flags)
+{
+        mcl->op = __HYPERVISOR_update_va_mapping;
+        mcl->result = 0;
+}
+
+static inline void
+MULTI_grant_table_op(struct multicall_entry *mcl, unsigned int cmd,
+        void *uop, unsigned int count)
+{
+        mcl->op = __HYPERVISOR_grant_table_op;
+        mcl->args[0] = cmd;
+        mcl->args[1] = (unsigned long)uop;
+        mcl->args[2] = count;
+}
+
+static inline void
+MULTI_mmu_update(struct multicall_entry *mcl, struct mmu_update *req,
+                 int count, int *success_count, domid_t domid)
+{
+        mcl->op = __HYPERVISOR_mmu_update;
+        mcl->args[0] = (unsigned long)req;
+        mcl->args[1] = count;
+        mcl->args[2] = (unsigned long)success_count;
+        mcl->args[3] = domid;
+}
+
+#endif /* _ASM_IA64_XEN_HYPERCALL_H */
diff --git a/arch/ia64/include/asm/xen/hypervisor.h b/arch/ia64/include/asm/xen/hypervisor.h
new file mode 100644
index 000000000000..7a804e80fc67
--- /dev/null
+++ b/arch/ia64/include/asm/xen/hypervisor.h
@@ -0,0 +1,89 @@
+/******************************************************************************
+ * hypervisor.h
+ *
+ * Linux-specific hypervisor handling.
+ *
+ * Copyright (c) 2002-2004, K A Fraser
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _ASM_IA64_XEN_HYPERVISOR_H
+#define _ASM_IA64_XEN_HYPERVISOR_H
+
+#ifdef CONFIG_XEN
+
+#include <linux/init.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/version.h>      /* to compile feature.c */
+#include <xen/features.h>               /* to comiple xen-netfront.c */
+#include <asm/xen/hypercall.h>
+
+/* xen_domain_type is set before executing any C code by early_xen_setup */
+enum xen_domain_type {
+        XEN_NATIVE,
+        XEN_PV_DOMAIN,
+        XEN_HVM_DOMAIN,
+};
+
+extern enum xen_domain_type xen_domain_type;
+
+#define xen_domain()            (xen_domain_type != XEN_NATIVE)
+#define xen_pv_domain()         (xen_domain_type == XEN_PV_DOMAIN)
+#define xen_initial_domain()    (xen_pv_domain() && \
+                                 (xen_start_info->flags & SIF_INITDOMAIN))
+#define xen_hvm_domain()        (xen_domain_type == XEN_HVM_DOMAIN)
+
+/* deprecated. remove this */
+#define is_running_on_xen()     (xen_domain_type == XEN_PV_DOMAIN)
+
+extern struct shared_info *HYPERVISOR_shared_info;
+extern struct start_info *xen_start_info;
+
+void __init xen_setup_vcpu_info_placement(void);
+void force_evtchn_callback(void);
+
+/* for drivers/xen/balloon/balloon.c */
+#ifdef CONFIG_XEN_SCRUB_PAGES
+#define scrub_pages(_p, _n) memset((void *)(_p), 0, (_n) << PAGE_SHIFT)
+#else
+#define scrub_pages(_p, _n) ((void)0)
+#endif
+
+/* For setup_arch() in arch/ia64/kernel/setup.c */
+void xen_ia64_enable_opt_feature(void);
+
+#else /* CONFIG_XEN */
+
+#define xen_domain()            (0)
+#define xen_pv_domain()         (0)
+#define xen_initial_domain()    (0)
+#define xen_hvm_domain()        (0)
+#define is_running_on_xen()     (0)     /* deprecated. remove this */
+#endif
+
+#define is_initial_xendomain()  (0)     /* deprecated. remove this */
+
+#endif /* _ASM_IA64_XEN_HYPERVISOR_H */
diff --git a/arch/ia64/include/asm/xen/inst.h b/arch/ia64/include/asm/xen/inst.h
new file mode 100644
index 000000000000..19c2ae1d878a
--- /dev/null
+++ b/arch/ia64/include/asm/xen/inst.h
@@ -0,0 +1,458 @@
+/******************************************************************************
+ * arch/ia64/include/asm/xen/inst.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <asm/xen/privop.h>
+
+#define ia64_ivt                                xen_ivt
+#define DO_SAVE_MIN                             XEN_DO_SAVE_MIN
+
+#define __paravirt_switch_to                    xen_switch_to
+#define __paravirt_leave_syscall                xen_leave_syscall
+#define __paravirt_work_processed_syscall       xen_work_processed_syscall
+#define __paravirt_leave_kernel                 xen_leave_kernel
+#define __paravirt_pending_syscall_end          xen_work_pending_syscall_end
+#define __paravirt_work_processed_syscall_target \
+                                                xen_work_processed_syscall
+
+#define MOV_FROM_IFA(reg)       \
+        movl reg = XSI_IFA;     \
+        ;;                      \
+        ld8 reg = [reg]
+
+#define MOV_FROM_ITIR(reg)      \
+        movl reg = XSI_ITIR;    \
+        ;;                      \
+        ld8 reg = [reg]
+
+#define MOV_FROM_ISR(reg)       \
+        movl reg = XSI_ISR;     \
+        ;;                      \
+        ld8 reg = [reg]
+
+#define MOV_FROM_IHA(reg)       \
+        movl reg = XSI_IHA;     \
+        ;;                      \
+        ld8 reg = [reg]
+
+#define MOV_FROM_IPSR(pred, reg)        \
+(pred)  movl reg = XSI_IPSR;            \
+        ;;                              \
+(pred)  ld8 reg = [reg]
+
+#define MOV_FROM_IIM(reg)       \
+        movl reg = XSI_IIM;     \
+        ;;                      \
+        ld8 reg = [reg]
+
+#define MOV_FROM_IIP(reg)       \
+        movl reg = XSI_IIP;     \
+        ;;                      \
+        ld8 reg = [reg]
+
+.macro __MOV_FROM_IVR reg, clob
+        .ifc "\reg", "r8"
+                XEN_HYPER_GET_IVR
+                .exitm
+        .endif
+        .ifc "\clob", "r8"
+                XEN_HYPER_GET_IVR
+                ;;
+                mov \reg = r8
+                .exitm
+        .endif
+
+        mov \clob = r8
+        ;;
+        XEN_HYPER_GET_IVR
+        ;;
+        mov \reg = r8
+        ;;
+        mov r8 = \clob
+.endm
+#define MOV_FROM_IVR(reg, clob) __MOV_FROM_IVR reg, clob
+
+.macro __MOV_FROM_PSR pred, reg, clob
+        .ifc "\reg", "r8"
+                (\pred) XEN_HYPER_GET_PSR;
+                .exitm
+        .endif
+        .ifc "\clob", "r8"
+                (\pred) XEN_HYPER_GET_PSR
+                ;;
+                (\pred) mov \reg = r8
+                .exitm
+        .endif
+
+        (\pred) mov \clob = r8
+        (\pred) XEN_HYPER_GET_PSR
+        ;;
+        (\pred) mov \reg = r8
+        (\pred) mov r8 = \clob
+.endm
+#define MOV_FROM_PSR(pred, reg, clob)   __MOV_FROM_PSR pred, reg, clob
+
+
+#define MOV_TO_IFA(reg, clob)   \
+        movl clob = XSI_IFA;    \
+        ;;                      \
+        st8 [clob] = reg        \
+
+#define MOV_TO_ITIR(pred, reg, clob)    \
+(pred)  movl clob = XSI_ITIR;           \
+        ;;                              \
+(pred)  st8 [clob] = reg
+
+#define MOV_TO_IHA(pred, reg, clob)     \
+(pred)  movl clob = XSI_IHA;            \
+        ;;                              \
+(pred)  st8 [clob] = reg
+
+#define MOV_TO_IPSR(pred, reg, clob)    \
+(pred)  movl clob = XSI_IPSR;           \
+        ;;                              \
+(pred)  st8 [clob] = reg;               \
+        ;;
+
+#define MOV_TO_IFS(pred, reg, clob)     \
+(pred)  movl clob = XSI_IFS;            \
+        ;;                              \
+(pred)  st8 [clob] = reg;               \
+        ;;
+
+#define MOV_TO_IIP(reg, clob)   \
+        movl clob = XSI_IIP;    \
+        ;;                      \
+        st8 [clob] = reg
+
+.macro ____MOV_TO_KR kr, reg, clob0, clob1
+        .ifc "\clob0", "r9"
+                .error "clob0 \clob0 must not be r9"
+        .endif
+        .ifc "\clob1", "r8"
+                .error "clob1 \clob1 must not be r8"
+        .endif
+
+        .ifnc "\reg", "r9"
+                .ifnc "\clob1", "r9"
+                        mov \clob1 = r9
+                .endif
+                mov r9 = \reg
+        .endif
+        .ifnc "\clob0", "r8"
+                mov \clob0 = r8
+        .endif
+        mov r8 = \kr
+        ;;
+        XEN_HYPER_SET_KR
+
+        .ifnc "\reg", "r9"
+                .ifnc "\clob1", "r9"
+                        mov r9 = \clob1
+                .endif
+        .endif
+        .ifnc "\clob0", "r8"
+                mov r8 = \clob0
+        .endif
+.endm
+
+.macro __MOV_TO_KR kr, reg, clob0, clob1
+        .ifc "\clob0", "r9"
+                ____MOV_TO_KR \kr, \reg, \clob1, \clob0
+                .exitm
+        .endif
+        .ifc "\clob1", "r8"
+                ____MOV_TO_KR \kr, \reg, \clob1, \clob0
+                .exitm
+        .endif
+
+        ____MOV_TO_KR \kr, \reg, \clob0, \clob1
+.endm
+
+#define MOV_TO_KR(kr, reg, clob0, clob1) \
+        __MOV_TO_KR IA64_KR_ ## kr, reg, clob0, clob1
+
+
+.macro __ITC_I pred, reg, clob
+        .ifc "\reg", "r8"
+                (\pred) XEN_HYPER_ITC_I
+                .exitm
+        .endif
+        .ifc "\clob", "r8"
+                (\pred) mov r8 = \reg
+                ;;
+                (\pred) XEN_HYPER_ITC_I
+                .exitm
+        .endif
+
+        (\pred) mov \clob = r8
+        (\pred) mov r8 = \reg
+        ;;
+        (\pred) XEN_HYPER_ITC_I
+        ;;
+        (\pred) mov r8 = \clob
+        ;;
+.endm
+#define ITC_I(pred, reg, clob)  __ITC_I pred, reg, clob
+
+.macro __ITC_D pred, reg, clob
+        .ifc "\reg", "r8"
+                (\pred) XEN_HYPER_ITC_D
+                ;;
+                .exitm
+        .endif
+        .ifc "\clob", "r8"
+                (\pred) mov r8 = \reg
+                ;;
+                (\pred) XEN_HYPER_ITC_D
+                ;;
+                .exitm
+        .endif
+
+        (\pred) mov \clob = r8
+        (\pred) mov r8 = \reg
+        ;;
+        (\pred) XEN_HYPER_ITC_D
+        ;;
+        (\pred) mov r8 = \clob
+        ;;
+.endm
+#define ITC_D(pred, reg, clob)  __ITC_D pred, reg, clob
+
+.macro __ITC_I_AND_D pred_i, pred_d, reg, clob
+        .ifc "\reg", "r8"
+                (\pred_i)XEN_HYPER_ITC_I
+                ;;
+                (\pred_d)XEN_HYPER_ITC_D
+                ;;
+                .exitm
+        .endif
+        .ifc "\clob", "r8"
+                mov r8 = \reg
+                ;;
+                (\pred_i)XEN_HYPER_ITC_I
+                ;;
+                (\pred_d)XEN_HYPER_ITC_D
+                ;;
+                .exitm
+        .endif
+
+        mov \clob = r8
+        mov r8 = \reg
+        ;;
+        (\pred_i)XEN_HYPER_ITC_I
+        ;;
+        (\pred_d)XEN_HYPER_ITC_D
+        ;;
+        mov r8 = \clob
+        ;;
+.endm
+#define ITC_I_AND_D(pred_i, pred_d, reg, clob) \
+        __ITC_I_AND_D pred_i, pred_d, reg, clob
+
+.macro __THASH pred, reg0, reg1, clob
+        .ifc "\reg0", "r8"
+                (\pred) mov r8 = \reg1
+                (\pred) XEN_HYPER_THASH
+                .exitm
+        .endc
+        .ifc "\reg1", "r8"
+                (\pred) XEN_HYPER_THASH
+                ;;
+                (\pred) mov \reg0 = r8
+                ;;
+                .exitm
+        .endif
+        .ifc "\clob", "r8"
+                (\pred) mov r8 = \reg1
+                (\pred) XEN_HYPER_THASH
+                ;;
+                (\pred) mov \reg0 = r8
+                ;;
+                .exitm
+        .endif
+
+        (\pred) mov \clob = r8
+        (\pred) mov r8 = \reg1
+        (\pred) XEN_HYPER_THASH
+        ;;
+        (\pred) mov \reg0 = r8
+        (\pred) mov r8 = \clob
+        ;;
+.endm
+#define THASH(pred, reg0, reg1, clob) __THASH pred, reg0, reg1, clob
+
+#define SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(clob0, clob1)    \
+        mov clob0 = 1;                                          \
+        movl clob1 = XSI_PSR_IC;                                \
+        ;;                                                      \
+        st4 [clob1] = clob0                                     \
+        ;;
+
+#define SSM_PSR_IC_AND_SRLZ_D(clob0, clob1)     \
+        ;;                                      \
+        srlz.d;                                 \
+        mov clob1 = 1;                          \
+        movl clob0 = XSI_PSR_IC;                \
+        ;;                                      \
+        st4 [clob0] = clob1
+
+#define RSM_PSR_IC(clob)        \
+        movl clob = XSI_PSR_IC; \
+        ;;                      \
+        st4 [clob] = r0;        \
+        ;;
+
+/* pred will be clobbered */
+#define MASK_TO_PEND_OFS    (-1)
+#define SSM_PSR_I(pred, pred_clob, clob)                                \
+(pred)  movl clob = XSI_PSR_I_ADDR                                      \
+        ;;                                                              \
+(pred)  ld8 clob = [clob]                                               \
+        ;;                                                              \
+        /* if (pred) vpsr.i = 1 */                                      \
+        /* if (pred) (vcpu->vcpu_info->evtchn_upcall_mask)=0 */         \
+(pred)  st1 [clob] = r0, MASK_TO_PEND_OFS                               \
+        ;;                                                              \
+        /* if (vcpu->vcpu_info->evtchn_upcall_pending) */               \
+(pred)  ld1 clob = [clob]                                               \
+        ;;                                                              \
+(pred)  cmp.ne.unc pred_clob, p0 = clob, r0                             \
+        ;;                                                              \
+(pred_clob)XEN_HYPER_SSM_I      /* do areal ssm psr.i */
+
+#define RSM_PSR_I(pred, clob0, clob1)   \
+        movl clob0 = XSI_PSR_I_ADDR;    \
+        mov clob1 = 1;                  \
+        ;;                              \
+        ld8 clob0 = [clob0];            \
+        ;;                              \
+(pred)  st1 [clob0] = clob1
+
+#define RSM_PSR_I_IC(clob0, clob1, clob2)               \
+        movl clob0 = XSI_PSR_I_ADDR;                    \
+        movl clob1 = XSI_PSR_IC;                        \
+        ;;                                              \
+        ld8 clob0 = [clob0];                            \
+        mov clob2 = 1;                                  \
+        ;;                                              \
+        /* note: clears both vpsr.i and vpsr.ic! */     \
+        st1 [clob0] = clob2;                            \
+        st4 [clob1] = r0;                               \
+        ;;
+
+#define RSM_PSR_DT              \
+        XEN_HYPER_RSM_PSR_DT
+
+#define SSM_PSR_DT_AND_SRLZ_I   \
+        XEN_HYPER_SSM_PSR_DT
+
+#define BSW_0(clob0, clob1, clob2)                      \
+        ;;                                              \
+        /* r16-r31 all now hold bank1 values */         \
+        mov clob2 = ar.unat;                            \
+        movl clob0 = XSI_BANK1_R16;                     \
+        movl clob1 = XSI_BANK1_R16 + 8;                 \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r16, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r17, 16;          \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r18, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r19, 16;          \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r20, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r21, 16;          \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r22, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r23, 16;          \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r24, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r25, 16;          \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r26, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r27, 16;          \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r28, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r29, 16;          \
+        ;;                                              \
+.mem.offset 0, 0; st8.spill [clob0] = r30, 16;          \
+.mem.offset 8, 0; st8.spill [clob1] = r31, 16;          \
+        ;;                                              \
+        mov clob1 = ar.unat;                            \
+        movl clob0 = XSI_B1NAT;                         \
+        ;;                                              \
+        st8 [clob0] = clob1;                            \
+        mov ar.unat = clob2;                            \
+        movl clob0 = XSI_BANKNUM;                       \
+        ;;                                              \
+        st4 [clob0] = r0
+
+
+        /* FIXME: THIS CODE IS NOT NaT SAFE! */
+#define XEN_BSW_1(clob)                 \
+        mov clob = ar.unat;             \
+        movl r30 = XSI_B1NAT;           \
+        ;;                              \
+        ld8 r30 = [r30];                \
+        mov r31 = 1;                    \
+        ;;                              \
+        mov ar.unat = r30;              \
+        movl r30 = XSI_BANKNUM;         \
+        ;;                              \
+        st4 [r30] = r31;                \
+        movl r30 = XSI_BANK1_R16;       \
+        movl r31 = XSI_BANK1_R16+8;     \
+        ;;                              \
+        ld8.fill r16 = [r30], 16;       \
+        ld8.fill r17 = [r31], 16;       \
+        ;;                              \
+        ld8.fill r18 = [r30], 16;       \
+        ld8.fill r19 = [r31], 16;       \
+        ;;                              \
+        ld8.fill r20 = [r30], 16;       \
+        ld8.fill r21 = [r31], 16;       \
+        ;;                              \
+        ld8.fill r22 = [r30], 16;       \
+        ld8.fill r23 = [r31], 16;       \
+        ;;                              \
+        ld8.fill r24 = [r30], 16;       \
+        ld8.fill r25 = [r31], 16;       \
+        ;;                              \
+        ld8.fill r26 = [r30], 16;       \
+        ld8.fill r27 = [r31], 16;       \
+        ;;                              \
+        ld8.fill r28 = [r30], 16;       \
+        ld8.fill r29 = [r31], 16;       \
+        ;;                              \
+        ld8.fill r30 = [r30];           \
+        ld8.fill r31 = [r31];           \
+        ;;                              \
+        mov ar.unat = clob
+
+#define BSW_1(clob0, clob1)     XEN_BSW_1(clob1)
+
+
+#define COVER   \
+        XEN_HYPER_COVER
+
+#define RFI                     \
+        XEN_HYPER_RFI;          \
+        dv_serialize_data
diff --git a/arch/ia64/include/asm/xen/interface.h b/arch/ia64/include/asm/xen/interface.h
new file mode 100644
index 000000000000..f00fab40854d
--- /dev/null
+++ b/arch/ia64/include/asm/xen/interface.h
@@ -0,0 +1,346 @@
+/******************************************************************************
+ * arch-ia64/hypervisor-if.h
+ *
+ * Guest OS interface to IA64 Xen.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Copyright by those who contributed. (in alphabetical order)
+ *
+ * Anthony Xu <anthony.xu@intel.com>
+ * Eddie Dong <eddie.dong@intel.com>
+ * Fred Yang <fred.yang@intel.com>
+ * Kevin Tian <kevin.tian@intel.com>
+ * Alex Williamson <alex.williamson@hp.com>
+ * Chris Wright <chrisw@sous-sol.org>
+ * Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
+ * Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com>
+ * Hollis Blanchard <hollisb@us.ibm.com>
+ * Isaku Yamahata <yamahata@valinux.co.jp>
+ * Jan Beulich <jbeulich@novell.com>
+ * John Levon <john.levon@sun.com>
+ * Kazuhiro Suzuki <kaz@jp.fujitsu.com>
+ * Keir Fraser <keir.fraser@citrix.com>
+ * Kouya Shimura <kouya@jp.fujitsu.com>
+ * Masaki Kanno <kanno.masaki@jp.fujitsu.com>
+ * Matt Chapman <matthewc@hp.com>
+ * Matthew Chapman <matthewc@hp.com>
+ * Samuel Thibault <samuel.thibault@eu.citrix.com>
+ * Tomonari Horikoshi <t.horikoshi@jp.fujitsu.com>
+ * Tristan Gingold <tgingold@free.fr>
+ * Tsunehisa Doi <Doi.Tsunehisa@jp.fujitsu.com>
+ * Yutaka Ezaki <yutaka.ezaki@jp.fujitsu.com>
+ * Zhang Xin <xing.z.zhang@intel.com>
+ * Zhang xiantao <xiantao.zhang@intel.com>
+ * dan.magenheimer@hp.com
+ * ian.pratt@cl.cam.ac.uk
+ * michael.fetterman@cl.cam.ac.uk
+ */
+
+#ifndef _ASM_IA64_XEN_INTERFACE_H
+#define _ASM_IA64_XEN_INTERFACE_H
+
+#define __DEFINE_GUEST_HANDLE(name, type)       \
+        typedef struct { type *p; } __guest_handle_ ## name
+
+#define DEFINE_GUEST_HANDLE_STRUCT(name)        \
+        __DEFINE_GUEST_HANDLE(name, struct name)
+#define DEFINE_GUEST_HANDLE(name)       __DEFINE_GUEST_HANDLE(name, name)
+#define GUEST_HANDLE(name)              __guest_handle_ ## name
+#define GUEST_HANDLE_64(name)           GUEST_HANDLE(name)
+#define set_xen_guest_handle(hnd, val)  do { (hnd).p = val; } while (0)
+
+#ifndef __ASSEMBLY__
+/* Guest handles for primitive C types. */
+__DEFINE_GUEST_HANDLE(uchar, unsigned char);
+__DEFINE_GUEST_HANDLE(uint, unsigned int);
+__DEFINE_GUEST_HANDLE(ulong, unsigned long);
+__DEFINE_GUEST_HANDLE(u64, unsigned long);
+DEFINE_GUEST_HANDLE(char);
+DEFINE_GUEST_HANDLE(int);
+DEFINE_GUEST_HANDLE(long);
+DEFINE_GUEST_HANDLE(void);
+
+typedef unsigned long xen_pfn_t;
+DEFINE_GUEST_HANDLE(xen_pfn_t);
+#define PRI_xen_pfn     "lx"
+#endif
+
+/* Arch specific VIRQs definition */
+#define VIRQ_ITC        VIRQ_ARCH_0     /* V. Virtual itc timer */
+#define VIRQ_MCA_CMC    VIRQ_ARCH_1     /* MCA cmc interrupt */
+#define VIRQ_MCA_CPE    VIRQ_ARCH_2     /* MCA cpe interrupt */
+
+/* Maximum number of virtual CPUs in multi-processor guests. */
+/* keep sizeof(struct shared_page) <= PAGE_SIZE.
+ * this is checked in arch/ia64/xen/hypervisor.c. */
+#define MAX_VIRT_CPUS   64
+
+#ifndef __ASSEMBLY__
+
+#define INVALID_MFN     (~0UL)
+
+union vac {
+        unsigned long value;
+        struct {
+                int a_int:1;
+                int a_from_int_cr:1;
+                int a_to_int_cr:1;
+                int a_from_psr:1;
+                int a_from_cpuid:1;
+                int a_cover:1;
+                int a_bsw:1;
+                long reserved:57;
+        };
+};
+
+union vdc {
+        unsigned long value;
+        struct {
+                int d_vmsw:1;
+                int d_extint:1;
+                int d_ibr_dbr:1;
+                int d_pmc:1;
+                int d_to_pmd:1;
+                int d_itm:1;
+                long reserved:58;
+        };
+};
+
+struct mapped_regs {
+        union vac vac;
+        union vdc vdc;
+        unsigned long virt_env_vaddr;
+        unsigned long reserved1[29];
+        unsigned long vhpi;
+        unsigned long reserved2[95];
+        union {
+                unsigned long vgr[16];
+                unsigned long bank1_regs[16];   /* bank1 regs (r16-r31)
+                                                   when bank0 active */
+        };
+        union {
+                unsigned long vbgr[16];
+                unsigned long bank0_regs[16];   /* bank0 regs (r16-r31)
+                                                   when bank1 active */
+        };
+        unsigned long vnat;
+        unsigned long vbnat;
+        unsigned long vcpuid[5];
+        unsigned long reserved3[11];
+        unsigned long vpsr;
+        unsigned long vpr;
+        unsigned long reserved4[76];
+        union {
+                unsigned long vcr[128];
+                struct {
+                        unsigned long dcr;      /* CR0 */
+                        unsigned long itm;
+                        unsigned long iva;
+                        unsigned long rsv1[5];
+                        unsigned long pta;      /* CR8 */
+                        unsigned long rsv2[7];
+                        unsigned long ipsr;     /* CR16 */
+                        unsigned long isr;
+                        unsigned long rsv3;
+                        unsigned long iip;
+                        unsigned long ifa;
+                        unsigned long itir;
+                        unsigned long iipa;
+                        unsigned long ifs;
+                        unsigned long iim;      /* CR24 */
+                        unsigned long iha;
+                        unsigned long rsv4[38];
+                        unsigned long lid;      /* CR64 */
+                        unsigned long ivr;
+                        unsigned long tpr;
+                        unsigned long eoi;
+                        unsigned long irr[4];
+                        unsigned long itv;      /* CR72 */
+                        unsigned long pmv;
+                        unsigned long cmcv;
+                        unsigned long rsv5[5];
+                        unsigned long lrr0;     /* CR80 */
+                        unsigned long lrr1;
+                        unsigned long rsv6[46];
+                };
+        };
+        union {
+                unsigned long reserved5[128];
+                struct {
+                        unsigned long precover_ifs;
+                        unsigned long unat;     /* not sure if this is needed
+                                                   until NaT arch is done */
+                        int interrupt_collection_enabled; /* virtual psr.ic */
+
+                        /* virtual interrupt deliverable flag is
+                         * evtchn_upcall_mask in shared info area now.
+                         * interrupt_mask_addr is the address
+                         * of evtchn_upcall_mask for current vcpu
+                         */
+                        unsigned char *interrupt_mask_addr;
+                        int pending_interruption;
+                        unsigned char vpsr_pp;
+                        unsigned char vpsr_dfh;
+                        unsigned char hpsr_dfh;
+                        unsigned char hpsr_mfh;
+                        unsigned long reserved5_1[4];
+                        int metaphysical_mode;  /* 1 = use metaphys mapping
+                                                   0 = use virtual */
+                        int banknum;            /* 0 or 1, which virtual
+                                                   register bank is active */
+                        unsigned long rrs[8];   /* region registers */
+                        unsigned long krs[8];   /* kernel registers */
+                        unsigned long tmp[16];  /* temp registers
+                                                   (e.g. for hyperprivops) */
+                };
+        };
+};
+
+struct arch_vcpu_info {
+        /* nothing */
+};
+
+/*
+ * This structure is used for magic page in domain pseudo physical address
+ * space and the result of XENMEM_machine_memory_map.
+ * As the XENMEM_machine_memory_map result,
+ * xen_memory_map::nr_entries indicates the size in bytes
+ * including struct xen_ia64_memmap_info. Not the number of entries.
+ */
+struct xen_ia64_memmap_info {
+        uint64_t efi_memmap_size;       /* size of EFI memory map */
+        uint64_t efi_memdesc_size;      /* size of an EFI memory map
+                                         * descriptor */
+        uint32_t efi_memdesc_version;   /* memory descriptor version */
+        void *memdesc[0];               /* array of efi_memory_desc_t */
+};
+
+struct arch_shared_info {
+        /* PFN of the start_info page.  */
+        unsigned long start_info_pfn;
+
+        /* Interrupt vector for event channel.  */
+        int evtchn_vector;
+
+        /* PFN of memmap_info page */
+        unsigned int memmap_info_num_pages;     /* currently only = 1 case is
+                                                   supported. */
+        unsigned long memmap_info_pfn;
+
+        uint64_t pad[31];
+};
+
+struct xen_callback {
+        unsigned long ip;
+};
+typedef struct xen_callback xen_callback_t;
+
+#endif /* !__ASSEMBLY__ */
+
+/* Size of the shared_info area (this is not related to page size).  */
+#define XSI_SHIFT                       14
+#define XSI_SIZE                        (1 << XSI_SHIFT)
+/* Log size of mapped_regs area (64 KB - only 4KB is used).  */
+#define XMAPPEDREGS_SHIFT               12
+#define XMAPPEDREGS_SIZE                (1 << XMAPPEDREGS_SHIFT)
+/* Offset of XASI (Xen arch shared info) wrt XSI_BASE.  */
+#define XMAPPEDREGS_OFS                 XSI_SIZE
+
+/* Hyperprivops.  */
+#define HYPERPRIVOP_START               0x1
+#define HYPERPRIVOP_RFI                 (HYPERPRIVOP_START + 0x0)
+#define HYPERPRIVOP_RSM_DT              (HYPERPRIVOP_START + 0x1)
+#define HYPERPRIVOP_SSM_DT              (HYPERPRIVOP_START + 0x2)
+#define HYPERPRIVOP_COVER               (HYPERPRIVOP_START + 0x3)
+#define HYPERPRIVOP_ITC_D               (HYPERPRIVOP_START + 0x4)
+#define HYPERPRIVOP_ITC_I               (HYPERPRIVOP_START + 0x5)
+#define HYPERPRIVOP_SSM_I               (HYPERPRIVOP_START + 0x6)
+#define HYPERPRIVOP_GET_IVR             (HYPERPRIVOP_START + 0x7)
+#define HYPERPRIVOP_GET_TPR             (HYPERPRIVOP_START + 0x8)
+#define HYPERPRIVOP_SET_TPR             (HYPERPRIVOP_START + 0x9)
+#define HYPERPRIVOP_EOI                 (HYPERPRIVOP_START + 0xa)
+#define HYPERPRIVOP_SET_ITM             (HYPERPRIVOP_START + 0xb)
+#define HYPERPRIVOP_THASH               (HYPERPRIVOP_START + 0xc)
+#define HYPERPRIVOP_PTC_GA              (HYPERPRIVOP_START + 0xd)
+#define HYPERPRIVOP_ITR_D               (HYPERPRIVOP_START + 0xe)
+#define HYPERPRIVOP_GET_RR              (HYPERPRIVOP_START + 0xf)
+#define HYPERPRIVOP_SET_RR              (HYPERPRIVOP_START + 0x10)
+#define HYPERPRIVOP_SET_KR              (HYPERPRIVOP_START + 0x11)
+#define HYPERPRIVOP_FC                  (HYPERPRIVOP_START + 0x12)
+#define HYPERPRIVOP_GET_CPUID           (HYPERPRIVOP_START + 0x13)
+#define HYPERPRIVOP_GET_PMD             (HYPERPRIVOP_START + 0x14)
+#define HYPERPRIVOP_GET_EFLAG           (HYPERPRIVOP_START + 0x15)
+#define HYPERPRIVOP_SET_EFLAG           (HYPERPRIVOP_START + 0x16)
+#define HYPERPRIVOP_RSM_BE              (HYPERPRIVOP_START + 0x17)
+#define HYPERPRIVOP_GET_PSR             (HYPERPRIVOP_START + 0x18)
+#define HYPERPRIVOP_SET_RR0_TO_RR4      (HYPERPRIVOP_START + 0x19)
+#define HYPERPRIVOP_MAX                 (0x1a)
+
+/* Fast and light hypercalls.  */
+#define __HYPERVISOR_ia64_fast_eoi      __HYPERVISOR_arch_1
+
+/* Xencomm macros.  */
+#define XENCOMM_INLINE_MASK             0xf800000000000000UL
+#define XENCOMM_INLINE_FLAG             0x8000000000000000UL
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Optimization features.
+ * The hypervisor may do some special optimizations for guests. This hypercall
+ * can be used to switch on/of these special optimizations.
+ */
+#define __HYPERVISOR_opt_feature        0x700UL
+
+#define XEN_IA64_OPTF_OFF               0x0
+#define XEN_IA64_OPTF_ON                0x1
+
+/*
+ * If this feature is switched on, the hypervisor inserts the
+ * tlb entries without calling the guests traphandler.
+ * This is useful in guests using region 7 for identity mapping
+ * like the linux kernel does.
+ */
+#define XEN_IA64_OPTF_IDENT_MAP_REG7    1
+
+/* Identity mapping of region 4 addresses in HVM. */
+#define XEN_IA64_OPTF_IDENT_MAP_REG4    2
+
+/* Identity mapping of region 5 addresses in HVM. */
+#define XEN_IA64_OPTF_IDENT_MAP_REG5    3
+
+#define XEN_IA64_OPTF_IDENT_MAP_NOT_SET  (0)
+
+struct xen_ia64_opt_feature {
+        unsigned long cmd;      /* Which feature */
+        unsigned char on;       /* Switch feature on/off */
+        union {
+                struct {
+                        /* The page protection bit mask of the pte.
+                         * This will be or'ed with the pte. */
+                        unsigned long pgprot;
+                        unsigned long key;      /* A protection key for itir.*/
+                };
+        };
+};
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_IA64_XEN_INTERFACE_H */
diff --git a/arch/ia64/include/asm/xen/irq.h b/arch/ia64/include/asm/xen/irq.h
new file mode 100644
index 000000000000..a90450983003
--- /dev/null
+++ b/arch/ia64/include/asm/xen/irq.h
@@ -0,0 +1,44 @@
+/******************************************************************************
+ * arch/ia64/include/asm/xen/irq.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef _ASM_IA64_XEN_IRQ_H
+#define _ASM_IA64_XEN_IRQ_H
+
+/*
+ * The flat IRQ space is divided into two regions:
+ *  1. A one-to-one mapping of real physical IRQs. This space is only used
+ *     if we have physical device-access privilege. This region is at the
+ *     start of the IRQ space so that existing device drivers do not need
+ *     to be modified to translate physical IRQ numbers into our IRQ space.
+ *  3. A dynamic mapping of inter-domain and Xen-sourced virtual IRQs. These
+ *     are bound using the provided bind/unbind functions.
+ */
+
+#define XEN_PIRQ_BASE           0
+#define XEN_NR_PIRQS            256
+
+#define XEN_DYNIRQ_BASE         (XEN_PIRQ_BASE + XEN_NR_PIRQS)
+#define XEN_NR_DYNIRQS          (NR_CPUS * 8)
+
+#define XEN_NR_IRQS             (XEN_NR_PIRQS + XEN_NR_DYNIRQS)
+
+#endif /* _ASM_IA64_XEN_IRQ_H */
diff --git a/arch/ia64/include/asm/xen/minstate.h b/arch/ia64/include/asm/xen/minstate.h
new file mode 100644
index 000000000000..4d92d9bbda7b
--- /dev/null
+++ b/arch/ia64/include/asm/xen/minstate.h
@@ -0,0 +1,134 @@
+/*
+ * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
+ * the minimum state necessary that allows us to turn psr.ic back
+ * on.
+ *
+ * Assumed state upon entry:
+ *      psr.ic: off
+ *      r31:    contains saved predicates (pr)
+ *
+ * Upon exit, the state is as follows:
+ *      psr.ic: off
+ *       r2 = points to &pt_regs.r16
+ *       r8 = contents of ar.ccv
+ *       r9 = contents of ar.csd
+ *      r10 = contents of ar.ssd
+ *      r11 = FPSR_DEFAULT
+ *      r12 = kernel sp (kernel virtual address)
+ *      r13 = points to current task_struct (kernel virtual address)
+ *      p15 = TRUE if psr.i is set in cr.ipsr
+ *      predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
+ *              preserved
+ * CONFIG_XEN note: p6/p7 are not preserved
+ *
+ * Note that psr.ic is NOT turned on by this macro.  This is so that
+ * we can pass interruption state as arguments to a handler.
+ */
+#define XEN_DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA,WORKAROUND)                                      \
+        mov r16=IA64_KR(CURRENT);       /* M */                                                 \
+        mov r27=ar.rsc;                 /* M */                                                 \
+        mov r20=r1;                     /* A */                                                 \
+        mov r25=ar.unat;                /* M */                                                 \
+        MOV_FROM_IPSR(p0,r29);          /* M */                                                 \
+        MOV_FROM_IIP(r28);              /* M */                                                 \
+        mov r21=ar.fpsr;                /* M */                                                 \
+        mov r26=ar.pfs;                 /* I */                                                 \
+        __COVER;                        /* B;; (or nothing) */                                  \
+        adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16;                                         \
+        ;;                                                                                      \
+        ld1 r17=[r16];                          /* load current->thread.on_ustack flag */       \
+        st1 [r16]=r0;                           /* clear current->thread.on_ustack flag */      \
+        adds r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16                                          \
+        /* switch from user to kernel RBS: */                                                   \
+        ;;                                                                                      \
+        invala;                         /* M */                                                 \
+        /* SAVE_IFS;*/ /* see xen special handling below */                                     \
+        cmp.eq pKStk,pUStk=r0,r17;              /* are we in kernel mode already? */            \
+        ;;                                                                                      \
+(pUStk) mov ar.rsc=0;           /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */     \
+        ;;                                                                                      \
+(pUStk) mov.m r24=ar.rnat;                                                                      \
+(pUStk) addl r22=IA64_RBS_OFFSET,r1;                    /* compute base of RBS */               \
+(pKStk) mov r1=sp;                                      /* get sp  */                           \
+        ;;                                                                                      \
+(pUStk) lfetch.fault.excl.nt1 [r22];                                                            \
+(pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1;   /* compute base of memory stack */      \
+(pUStk) mov r23=ar.bspstore;                            /* save ar.bspstore */                  \
+        ;;                                                                                      \
+(pUStk) mov ar.bspstore=r22;                            /* switch to kernel RBS */              \
+(pKStk) addl r1=-IA64_PT_REGS_SIZE,r1;                  /* if in kernel mode, use sp (r12) */   \
+        ;;                                                                                      \
+(pUStk) mov r18=ar.bsp;                                                                         \
+(pUStk) mov ar.rsc=0x3;         /* set eager mode, pl 0, little-endian, loadrs=0 */             \
+        adds r17=2*L1_CACHE_BYTES,r1;           /* really: biggest cache-line size */           \
+        adds r16=PT(CR_IPSR),r1;                                                                \
+        ;;                                                                                      \
+        lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES;                                             \
+        st8 [r16]=r29;          /* save cr.ipsr */                                              \
+        ;;                                                                                      \
+        lfetch.fault.excl.nt1 [r17];                                                            \
+        tbit.nz p15,p0=r29,IA64_PSR_I_BIT;                                                      \
+        mov r29=b0                                                                              \
+        ;;                                                                                      \
+        WORKAROUND;                                                                             \
+        adds r16=PT(R8),r1;     /* initialize first base pointer */                             \
+        adds r17=PT(R9),r1;     /* initialize second base pointer */                            \
+(pKStk) mov r18=r0;             /* make sure r18 isn't NaT */                                   \
+        ;;                                                                                      \
+.mem.offset 0,0; st8.spill [r16]=r8,16;                                                         \
+.mem.offset 8,0; st8.spill [r17]=r9,16;                                                         \
+        ;;                                                                                      \
+.mem.offset 0,0; st8.spill [r16]=r10,24;                                                        \
+        movl r8=XSI_PRECOVER_IFS;                                                               \
+.mem.offset 8,0; st8.spill [r17]=r11,24;                                                        \
+        ;;                                                                                      \
+        /* xen special handling for possibly lazy cover */                                      \
+        /* SAVE_MIN case in dispatch_ia32_handler: mov r30=r0 */                                \
+        ld8 r30=[r8];                                                                           \
+(pUStk) sub r18=r18,r22;        /* r18=RSE.ndirty*8 */                                          \
+        st8 [r16]=r28,16;       /* save cr.iip */                                               \
+        ;;                                                                                      \
+        st8 [r17]=r30,16;       /* save cr.ifs */                                               \
+        mov r8=ar.ccv;                                                                          \
+        mov r9=ar.csd;                                                                          \
+        mov r10=ar.ssd;                                                                         \
+        movl r11=FPSR_DEFAULT;   /* L-unit */                                                   \
+        ;;                                                                                      \
+        st8 [r16]=r25,16;       /* save ar.unat */                                              \
+        st8 [r17]=r26,16;       /* save ar.pfs */                                               \
+        shl r18=r18,16;         /* compute ar.rsc to be used for "loadrs" */                    \
+        ;;                                                                                      \
+        st8 [r16]=r27,16;       /* save ar.rsc */                                               \
+(pUStk) st8 [r17]=r24,16;       /* save ar.rnat */                                              \
+(pKStk) adds r17=16,r17;        /* skip over ar_rnat field */                                   \
+        ;;                      /* avoid RAW on r16 & r17 */                                    \
+(pUStk) st8 [r16]=r23,16;       /* save ar.bspstore */                                          \
+        st8 [r17]=r31,16;       /* save predicates */                                           \
+(pKStk) adds r16=16,r16;        /* skip over ar_bspstore field */                               \
+        ;;                                                                                      \
+        st8 [r16]=r29,16;       /* save b0 */                                                   \
+        st8 [r17]=r18,16;       /* save ar.rsc value for "loadrs" */                            \
+        cmp.eq pNonSys,pSys=r0,r0       /* initialize pSys=0, pNonSys=1 */                      \
+        ;;                                                                                      \
+.mem.offset 0,0; st8.spill [r16]=r20,16;        /* save original r1 */                          \
+.mem.offset 8,0; st8.spill [r17]=r12,16;                                                        \
+        adds r12=-16,r1;        /* switch to kernel memory stack (with 16 bytes of scratch) */  \
+        ;;                                                                                      \
+.mem.offset 0,0; st8.spill [r16]=r13,16;                                                        \
+.mem.offset 8,0; st8.spill [r17]=r21,16;        /* save ar.fpsr */                              \
+        mov r13=IA64_KR(CURRENT);       /* establish `current' */                               \
+        ;;                                                                                      \
+.mem.offset 0,0; st8.spill [r16]=r15,16;                                                        \
+.mem.offset 8,0; st8.spill [r17]=r14,16;                                                        \
+        ;;                                                                                      \
+.mem.offset 0,0; st8.spill [r16]=r2,16;                                                         \
+.mem.offset 8,0; st8.spill [r17]=r3,16;                                                         \
+        ACCOUNT_GET_STAMP                                                                       \
+        adds r2=IA64_PT_REGS_R16_OFFSET,r1;                                                     \
+        ;;                                                                                      \
+        EXTRA;                                                                                  \
+        movl r1=__gp;           /* establish kernel global pointer */                           \
+        ;;                                                                                      \
+        ACCOUNT_SYS_ENTER                                                                       \
+        BSW_1(r3,r14);  /* switch back to bank 1 (must be last in insn group) */                \
+        ;;
diff --git a/arch/ia64/include/asm/xen/page.h b/arch/ia64/include/asm/xen/page.h
new file mode 100644
index 000000000000..03441a780b5b
--- /dev/null
+++ b/arch/ia64/include/asm/xen/page.h
@@ -0,0 +1,65 @@
+/******************************************************************************
+ * arch/ia64/include/asm/xen/page.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef _ASM_IA64_XEN_PAGE_H
+#define _ASM_IA64_XEN_PAGE_H
+
+#define INVALID_P2M_ENTRY       (~0UL)
+
+static inline unsigned long mfn_to_pfn(unsigned long mfn)
+{
+        return mfn;
+}
+
+static inline unsigned long pfn_to_mfn(unsigned long pfn)
+{
+        return pfn;
+}
+
+#define phys_to_machine_mapping_valid(_x)       (1)
+
+static inline void *mfn_to_virt(unsigned long mfn)
+{
+        return __va(mfn << PAGE_SHIFT);
+}
+
+static inline unsigned long virt_to_mfn(void *virt)
+{
+        return __pa(virt) >> PAGE_SHIFT;
+}
+
+/* for tpmfront.c */
+static inline unsigned long virt_to_machine(void *virt)
+{
+        return __pa(virt);
+}
+
+static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
+{
+        /* nothing */
+}
+
+#define pte_mfn(_x)     pte_pfn(_x)
+#define mfn_pte(_x, _y) __pte_ma(0)             /* unmodified use */
+#define __pte_ma(_x)    ((pte_t) {(_x)})        /* unmodified use */
+
+#endif /* _ASM_IA64_XEN_PAGE_H */
diff --git a/arch/ia64/include/asm/xen/privop.h b/arch/ia64/include/asm/xen/privop.h
new file mode 100644
index 000000000000..71ec7546e100
--- /dev/null
+++ b/arch/ia64/include/asm/xen/privop.h
@@ -0,0 +1,129 @@
+#ifndef _ASM_IA64_XEN_PRIVOP_H
+#define _ASM_IA64_XEN_PRIVOP_H
+
+/*
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *      Dan Magenheimer <dan.magenheimer@hp.com>
+ *
+ * Paravirtualizations of privileged operations for Xen/ia64
+ *
+ *
+ * inline privop and paravirt_alt support
+ * Copyright (c) 2007 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ */
+
+#ifndef __ASSEMBLY__
+#include <linux/types.h>                /* arch-ia64.h requires uint64_t */
+#endif
+#include <asm/xen/interface.h>
+
+/* At 1 MB, before per-cpu space but still addressable using addl instead
+   of movl. */
+#define XSI_BASE                        0xfffffffffff00000
+
+/* Address of mapped regs.  */
+#define XMAPPEDREGS_BASE                (XSI_BASE + XSI_SIZE)
+
+#ifdef __ASSEMBLY__
+#define XEN_HYPER_RFI                   break HYPERPRIVOP_RFI
+#define XEN_HYPER_RSM_PSR_DT            break HYPERPRIVOP_RSM_DT
+#define XEN_HYPER_SSM_PSR_DT            break HYPERPRIVOP_SSM_DT
+#define XEN_HYPER_COVER                 break HYPERPRIVOP_COVER
+#define XEN_HYPER_ITC_D                 break HYPERPRIVOP_ITC_D
+#define XEN_HYPER_ITC_I                 break HYPERPRIVOP_ITC_I
+#define XEN_HYPER_SSM_I                 break HYPERPRIVOP_SSM_I
+#define XEN_HYPER_GET_IVR               break HYPERPRIVOP_GET_IVR
+#define XEN_HYPER_THASH                 break HYPERPRIVOP_THASH
+#define XEN_HYPER_ITR_D                 break HYPERPRIVOP_ITR_D
+#define XEN_HYPER_SET_KR                break HYPERPRIVOP_SET_KR
+#define XEN_HYPER_GET_PSR               break HYPERPRIVOP_GET_PSR
+#define XEN_HYPER_SET_RR0_TO_RR4        break HYPERPRIVOP_SET_RR0_TO_RR4
+
+#define XSI_IFS                         (XSI_BASE + XSI_IFS_OFS)
+#define XSI_PRECOVER_IFS                (XSI_BASE + XSI_PRECOVER_IFS_OFS)
+#define XSI_IFA                         (XSI_BASE + XSI_IFA_OFS)
+#define XSI_ISR                         (XSI_BASE + XSI_ISR_OFS)
+#define XSI_IIM                         (XSI_BASE + XSI_IIM_OFS)
+#define XSI_ITIR                        (XSI_BASE + XSI_ITIR_OFS)
+#define XSI_PSR_I_ADDR                  (XSI_BASE + XSI_PSR_I_ADDR_OFS)
+#define XSI_PSR_IC                      (XSI_BASE + XSI_PSR_IC_OFS)
+#define XSI_IPSR                        (XSI_BASE + XSI_IPSR_OFS)
+#define XSI_IIP                         (XSI_BASE + XSI_IIP_OFS)
+#define XSI_B1NAT                       (XSI_BASE + XSI_B1NATS_OFS)
+#define XSI_BANK1_R16                   (XSI_BASE + XSI_BANK1_R16_OFS)
+#define XSI_BANKNUM                     (XSI_BASE + XSI_BANKNUM_OFS)
+#define XSI_IHA                         (XSI_BASE + XSI_IHA_OFS)
+#endif
+
+#ifndef __ASSEMBLY__
+
+/************************************************/
+/* Instructions paravirtualized for correctness */
+/************************************************/
+
+/* "fc" and "thash" are privilege-sensitive instructions, meaning they
+ *  may have different semantics depending on whether they are executed
+ *  at PL0 vs PL!=0.  When paravirtualized, these instructions mustn't
+ *  be allowed to execute directly, lest incorrect semantics result. */
+extern void xen_fc(unsigned long addr);
+extern unsigned long xen_thash(unsigned long addr);
+
+/* Note that "ttag" and "cover" are also privilege-sensitive; "ttag"
+ * is not currently used (though it may be in a long-format VHPT system!)
+ * and the semantics of cover only change if psr.ic is off which is very
+ * rare (and currently non-existent outside of assembly code */
+
+/* There are also privilege-sensitive registers.  These registers are
+ * readable at any privilege level but only writable at PL0. */
+extern unsigned long xen_get_cpuid(int index);
+extern unsigned long xen_get_pmd(int index);
+
+extern unsigned long xen_get_eflag(void);       /* see xen_ia64_getreg */
+extern void xen_set_eflag(unsigned long);       /* see xen_ia64_setreg */
+
+/************************************************/
+/* Instructions paravirtualized for performance */
+/************************************************/
+
+/* Xen uses memory-mapped virtual privileged registers for access to many
+ * performance-sensitive privileged registers.  Some, like the processor
+ * status register (psr), are broken up into multiple memory locations.
+ * Others, like "pend", are abstractions based on privileged registers.
+ * "Pend" is guaranteed to be set if reading cr.ivr would return a
+ * (non-spurious) interrupt. */
+#define XEN_MAPPEDREGS ((struct mapped_regs *)XMAPPEDREGS_BASE)
+
+#define XSI_PSR_I                       \
+        (*XEN_MAPPEDREGS->interrupt_mask_addr)
+#define xen_get_virtual_psr_i()         \
+        (!XSI_PSR_I)
+#define xen_set_virtual_psr_i(_val)     \
+        ({ XSI_PSR_I = (uint8_t)(_val) ? 0 : 1; })
+#define xen_set_virtual_psr_ic(_val)    \
+        ({ XEN_MAPPEDREGS->interrupt_collection_enabled = _val ? 1 : 0; })
+#define xen_get_virtual_pend()          \
+        (*(((uint8_t *)XEN_MAPPEDREGS->interrupt_mask_addr) - 1))
+
+/* Although all privileged operations can be left to trap and will
+ * be properly handled by Xen, some are frequent enough that we use
+ * hyperprivops for performance. */
+extern unsigned long xen_get_psr(void);
+extern unsigned long xen_get_ivr(void);
+extern unsigned long xen_get_tpr(void);
+extern void xen_hyper_ssm_i(void);
+extern void xen_set_itm(unsigned long);
+extern void xen_set_tpr(unsigned long);
+extern void xen_eoi(unsigned long);
+extern unsigned long xen_get_rr(unsigned long index);
+extern void xen_set_rr(unsigned long index, unsigned long val);
+extern void xen_set_rr0_to_rr4(unsigned long val0, unsigned long val1,
+                               unsigned long val2, unsigned long val3,
+                               unsigned long val4);
+extern void xen_set_kr(unsigned long index, unsigned long val);
+extern void xen_ptcga(unsigned long addr, unsigned long size);
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_IA64_XEN_PRIVOP_H */
diff --git a/arch/ia64/include/asm/xen/xcom_hcall.h b/arch/ia64/include/asm/xen/xcom_hcall.h
new file mode 100644
index 000000000000..20b2950c71b6
--- /dev/null
+++ b/arch/ia64/include/asm/xen/xcom_hcall.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2006 Tristan Gingold <tristan.gingold@bull.net>, Bull SAS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#ifndef _ASM_IA64_XEN_XCOM_HCALL_H
+#define _ASM_IA64_XEN_XCOM_HCALL_H
+
+/* These function creates inline or mini descriptor for the parameters and
+   calls the corresponding xencomm_arch_hypercall_X.
+   Architectures should defines HYPERVISOR_xxx as xencomm_hypercall_xxx unless
+   they want to use their own wrapper.  */
+extern int xencomm_hypercall_console_io(int cmd, int count, char *str);
+
+extern int xencomm_hypercall_event_channel_op(int cmd, void *op);
+
+extern int xencomm_hypercall_xen_version(int cmd, void *arg);
+
+extern int xencomm_hypercall_physdev_op(int cmd, void *op);
+
+extern int xencomm_hypercall_grant_table_op(unsigned int cmd, void *op,
+                                            unsigned int count);
+
+extern int xencomm_hypercall_sched_op(int cmd, void *arg);
+
+extern int xencomm_hypercall_multicall(void *call_list, int nr_calls);
+
+extern int xencomm_hypercall_callback_op(int cmd, void *arg);
+
+extern int xencomm_hypercall_memory_op(unsigned int cmd, void *arg);
+
+extern int xencomm_hypercall_suspend(unsigned long srec);
+
+extern long xencomm_hypercall_vcpu_op(int cmd, int cpu, void *arg);
+
+extern long xencomm_hypercall_opt_feature(void *arg);
+
+#endif /* _ASM_IA64_XEN_XCOM_HCALL_H */
diff --git a/arch/ia64/include/asm/xen/xencomm.h b/arch/ia64/include/asm/xen/xencomm.h
new file mode 100644
index 000000000000..cded677bebf2
--- /dev/null
+++ b/arch/ia64/include/asm/xen/xencomm.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2006 Hollis Blanchard <hollisb@us.ibm.com>, IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#ifndef _ASM_IA64_XEN_XENCOMM_H
+#define _ASM_IA64_XEN_XENCOMM_H
+
+#include <xen/xencomm.h>
+#include <asm/pgtable.h>
+
+/* Must be called before any hypercall.  */
+extern void xencomm_initialize(void);
+extern int xencomm_is_initialized(void);
+
+/* Check if virtual contiguity means physical contiguity
+ * where the passed address is a pointer value in virtual address.
+ * On ia64, identity mapping area in region 7 or the piece of region 5
+ * that is mapped by itr[IA64_TR_KERNEL]/dtr[IA64_TR_KERNEL]
+ */
+static inline int xencomm_is_phys_contiguous(unsigned long addr)
+{
+        return (PAGE_OFFSET <= addr &&
+                addr < (PAGE_OFFSET + (1UL << IA64_MAX_PHYS_BITS))) ||
+                (KERNEL_START <= addr &&
+                 addr < KERNEL_START + KERNEL_TR_PAGE_SIZE);
+}
+
+#endif /* _ASM_IA64_XEN_XENCOMM_H */
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index 87fea11aecb7..c381ea954892 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -42,6 +42,10 @@ obj-$(CONFIG_IA64_ESI)		+= esi.o
 ifneq ($(CONFIG_IA64_ESI),)
 obj-y                           += esi_stub.o   # must be in kernel proper
 endif
+obj-$(CONFIG_DMAR)              += pci-dma.o
+ifeq ($(CONFIG_DMAR), y)
+obj-$(CONFIG_SWIOTLB)           += pci-swiotlb.o
+endif
 
 # The gate DSO image is built using a special linker script.
 targets += gate.so gate-syms.o
@@ -112,5 +116,23 @@ clean-files += $(objtree)/include/asm-ia64/nr-irqs.h
 ASM_PARAVIRT_OBJS = ivt.o entry.o
 define paravirtualized_native
 AFLAGS_$(1) += -D__IA64_ASM_PARAVIRTUALIZED_NATIVE
+AFLAGS_pvchk-sed-$(1) += -D__IA64_ASM_PARAVIRTUALIZED_PVCHECK
+extra-y += pvchk-$(1)
 endef
 $(foreach obj,$(ASM_PARAVIRT_OBJS),$(eval $(call paravirtualized_native,$(obj))))
+
+#
+# Checker for paravirtualizations of privileged operations.
+#
+quiet_cmd_pv_check_sed = PVCHK   $@
+define cmd_pv_check_sed
+        sed -f $(srctree)/arch/$(SRCARCH)/scripts/pvcheck.sed $< > $@
+endef
+
+$(obj)/pvchk-sed-%.s: $(src)/%.S $(srctree)/arch/$(SRCARCH)/scripts/pvcheck.sed FORCE
+        $(call if_changed_dep,as_s_S)
+$(obj)/pvchk-%.s: $(obj)/pvchk-sed-%.s FORCE
+        $(call if_changed,pv_check_sed)
+$(obj)/pvchk-%.o: $(obj)/pvchk-%.s FORCE
+        $(call if_changed,as_o_S)
+.PRECIOUS: $(obj)/pvchk-sed-%.s $(obj)/pvchk-%.s $(obj)/pvchk-%.o
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 5d1eb7ee2bf6..0635015d0aaa 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -52,6 +52,7 @@
 #include <asm/numa.h>
 #include <asm/sal.h>
 #include <asm/cyclone.h>
+#include <asm/xen/hypervisor.h>
 
 #define BAD_MADT_ENTRY(entry, end) (                                        \
                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
@@ -91,6 +92,9 @@ acpi_get_sysname(void)
         struct acpi_table_rsdp *rsdp;
         struct acpi_table_xsdt *xsdt;
         struct acpi_table_header *hdr;
+#ifdef CONFIG_DMAR
+        u64 i, nentries;
+#endif
 
         rsdp_phys = acpi_find_rsdp();
         if (!rsdp_phys) {
@@ -121,7 +125,21 @@ acpi_get_sysname(void)
                         return "uv";
                 else
                         return "sn2";
+        } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
+                return "xen";
+        }
+
+#ifdef CONFIG_DMAR
+        /* Look for Intel IOMMU */
+        nentries = (hdr->length - sizeof(*hdr)) /
+                         sizeof(xsdt->table_offset_entry[0]);
+        for (i = 0; i < nentries; i++) {
+                hdr = __va(xsdt->table_offset_entry[i]);
+                if (strncmp(hdr->signature, ACPI_SIG_DMAR,
+                        sizeof(ACPI_SIG_DMAR) - 1) == 0)
+                        return "dig_vtd";
         }
+#endif
 
         return "dig";
 #else
@@ -137,6 +155,10 @@ acpi_get_sysname(void)
         return "uv";
 # elif defined (CONFIG_IA64_DIG)
         return "dig";
+# elif defined (CONFIG_IA64_XEN_GUEST)
+        return "xen";
+# elif defined(CONFIG_IA64_DIG_VTD)
+        return "dig_vtd";
 # else
 #       error Unknown platform.  Fix acpi.c.
 # endif
diff --git a/arch/ia64/kernel/asm-offsets.c b/arch/ia64/kernel/asm-offsets.c
index 94c44b1ccfd0..742dbb1d5a4f 100644
--- a/arch/ia64/kernel/asm-offsets.c
+++ b/arch/ia64/kernel/asm-offsets.c
@@ -16,6 +16,9 @@
 #include <asm/sigcontext.h>
 #include <asm/mca.h>
 
+#include <asm/xen/interface.h>
+#include <asm/xen/hypervisor.h>
+
 #include "../kernel/sigframe.h"
 #include "../kernel/fsyscall_gtod_data.h"
 
@@ -286,4 +289,32 @@ void foo(void)
                 offsetof (struct itc_jitter_data_t, itc_jitter));
         DEFINE(IA64_ITC_LASTCYCLE_OFFSET,
                 offsetof (struct itc_jitter_data_t, itc_lastcycle));
+
+#ifdef CONFIG_XEN
+        BLANK();
+
+        DEFINE(XEN_NATIVE_ASM, XEN_NATIVE);
+        DEFINE(XEN_PV_DOMAIN_ASM, XEN_PV_DOMAIN);
+
+#define DEFINE_MAPPED_REG_OFS(sym, field) \
+        DEFINE(sym, (XMAPPEDREGS_OFS + offsetof(struct mapped_regs, field)))
+
+        DEFINE_MAPPED_REG_OFS(XSI_PSR_I_ADDR_OFS, interrupt_mask_addr);
+        DEFINE_MAPPED_REG_OFS(XSI_IPSR_OFS, ipsr);
+        DEFINE_MAPPED_REG_OFS(XSI_IIP_OFS, iip);
+        DEFINE_MAPPED_REG_OFS(XSI_IFS_OFS, ifs);
+        DEFINE_MAPPED_REG_OFS(XSI_PRECOVER_IFS_OFS, precover_ifs);
+        DEFINE_MAPPED_REG_OFS(XSI_ISR_OFS, isr);
+        DEFINE_MAPPED_REG_OFS(XSI_IFA_OFS, ifa);
+        DEFINE_MAPPED_REG_OFS(XSI_IIPA_OFS, iipa);
+        DEFINE_MAPPED_REG_OFS(XSI_IIM_OFS, iim);
+        DEFINE_MAPPED_REG_OFS(XSI_IHA_OFS, iha);
+        DEFINE_MAPPED_REG_OFS(XSI_ITIR_OFS, itir);
+        DEFINE_MAPPED_REG_OFS(XSI_PSR_IC_OFS, interrupt_collection_enabled);
+        DEFINE_MAPPED_REG_OFS(XSI_BANKNUM_OFS, banknum);
+        DEFINE_MAPPED_REG_OFS(XSI_BANK0_R16_OFS, bank0_regs[0]);
+        DEFINE_MAPPED_REG_OFS(XSI_BANK1_R16_OFS, bank1_regs[0]);
+        DEFINE_MAPPED_REG_OFS(XSI_B0NATS_OFS, vbnat);
+        DEFINE_MAPPED_REG_OFS(XSI_B1NATS_OFS, vnat);
+#endif /* CONFIG_XEN */
 }
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 0dd6c1419d8d..7ef0c594f5ed 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -534,6 +534,11 @@ GLOBAL_ENTRY(ia64_trace_syscall)
         stf.spill [r16]=f10
         stf.spill [r17]=f11
         br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args
+        cmp.lt p6,p0=r8,r0                      // check tracehook
+        adds r2=PT(R8)+16,sp                    // r2 = &pt_regs.r8
+        adds r3=PT(R10)+16,sp                   // r3 = &pt_regs.r10
+        mov r10=0
+(p6)    br.cond.sptk strace_error               // syscall failed ->
         adds r16=PT(F6)+16,sp
         adds r17=PT(F7)+16,sp
         ;;
diff --git a/arch/ia64/kernel/ivt.S b/arch/ia64/kernel/ivt.S
index 416a952b19bd..f675d8e33853 100644
--- a/arch/ia64/kernel/ivt.S
+++ b/arch/ia64/kernel/ivt.S
@@ -580,7 +580,7 @@ ENTRY(dirty_bit)
         mov b0=r29                              // restore b0
         ;;
         st8 [r17]=r18                           // store back updated PTE
-        itc.d r18                               // install updated PTE
+        ITC_D(p0, r18, r16)                     // install updated PTE
 #endif
         mov pr=r31,-1                           // restore pr
         RFI
@@ -646,7 +646,7 @@ ENTRY(iaccess_bit)
         mov b0=r29                              // restore b0
         ;;
         st8 [r17]=r18                           // store back updated PTE
-        itc.i r18                               // install updated PTE
+        ITC_I(p0, r18, r16)                     // install updated PTE
 #endif /* !CONFIG_SMP */
         mov pr=r31,-1
         RFI
@@ -698,7 +698,7 @@ ENTRY(daccess_bit)
         or r18=_PAGE_A,r18                      // set the accessed bit
         ;;
         st8 [r17]=r18                           // store back updated PTE
-        itc.d r18                               // install updated PTE
+        ITC_D(p0, r18, r16)                     // install updated PTE
 #endif
         mov b0=r29                              // restore b0
         mov pr=r31,-1
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index 60c6ef67ebb2..702a09c13238 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -5,6 +5,7 @@
 #include <linux/pci.h>
 #include <linux/irq.h>
 #include <linux/msi.h>
+#include <linux/dmar.h>
 #include <asm/smp.h>
 
 /*
@@ -162,3 +163,82 @@ void arch_teardown_msi_irq(unsigned int irq)
 
         return ia64_teardown_msi_irq(irq);
 }
+
+#ifdef CONFIG_DMAR
+#ifdef CONFIG_SMP
+static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask)
+{
+        struct irq_cfg *cfg = irq_cfg + irq;
+        struct msi_msg msg;
+        int cpu = first_cpu(mask);
+
+
+        if (!cpu_online(cpu))
+                return;
+
+        if (irq_prepare_move(irq, cpu))
+                return;
+
+        dmar_msi_read(irq, &msg);
+
+        msg.data &= ~MSI_DATA_VECTOR_MASK;
+        msg.data |= MSI_DATA_VECTOR(cfg->vector);
+        msg.address_lo &= ~MSI_ADDR_DESTID_MASK;
+        msg.address_lo |= MSI_ADDR_DESTID_CPU(cpu_physical_id(cpu));
+
+        dmar_msi_write(irq, &msg);
+        irq_desc[irq].affinity = mask;
+}
+#endif /* CONFIG_SMP */
+
+struct irq_chip dmar_msi_type = {
+        .name = "DMAR_MSI",
+        .unmask = dmar_msi_unmask,
+        .mask = dmar_msi_mask,
+        .ack = ia64_ack_msi_irq,
+#ifdef CONFIG_SMP
+        .set_affinity = dmar_msi_set_affinity,
+#endif
+        .retrigger = ia64_msi_retrigger_irq,
+};
+
+static int
+msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
+{
+        struct irq_cfg *cfg = irq_cfg + irq;
+        unsigned dest;
+        cpumask_t mask;
+
+        cpus_and(mask, irq_to_domain(irq), cpu_online_map);
+        dest = cpu_physical_id(first_cpu(mask));
+
+        msg->address_hi = 0;
+        msg->address_lo =
+                MSI_ADDR_HEADER |
+                MSI_ADDR_DESTMODE_PHYS |
+                MSI_ADDR_REDIRECTION_CPU |
+                MSI_ADDR_DESTID_CPU(dest);
+
+        msg->data =
+                MSI_DATA_TRIGGER_EDGE |
+                MSI_DATA_LEVEL_ASSERT |
+                MSI_DATA_DELIVERY_FIXED |
+                MSI_DATA_VECTOR(cfg->vector);
+        return 0;
+}
+
+int arch_setup_dmar_msi(unsigned int irq)
+{
+        int ret;
+        struct msi_msg msg;
+
+        ret = msi_compose_msg(NULL, irq, &msg);
+        if (ret < 0)
+                return ret;
+        dmar_msi_write(irq, &msg);
+        set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
+                "edge");
+        return 0;
+}
+#endif /* CONFIG_DMAR */
+
diff --git a/arch/ia64/kernel/nr-irqs.c b/arch/ia64/kernel/nr-irqs.c
index 8273afc32db8..ee564575148e 100644
--- a/arch/ia64/kernel/nr-irqs.c
+++ b/arch/ia64/kernel/nr-irqs.c
@@ -10,6 +10,7 @@
 #include <linux/kbuild.h>
 #include <linux/threads.h>
 #include <asm/native/irq.h>
+#include <asm/xen/irq.h>
 
 void foo(void)
 {
diff --git a/arch/ia64/kernel/paravirt.c b/arch/ia64/kernel/paravirt.c
index afaf5b9a2cf0..de35d8e8b7d2 100644
--- a/arch/ia64/kernel/paravirt.c
+++ b/arch/ia64/kernel/paravirt.c
@@ -332,7 +332,7 @@ ia64_native_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
 
 struct pv_iosapic_ops pv_iosapic_ops = {
         .pcat_compat_init = ia64_native_iosapic_pcat_compat_init,
-        .get_irq_chip = ia64_native_iosapic_get_irq_chip,
+        .__get_irq_chip = ia64_native_iosapic_get_irq_chip,
 
         .__read = ia64_native_iosapic_read,
         .__write = ia64_native_iosapic_write,
diff --git a/arch/ia64/kernel/paravirt_inst.h b/arch/ia64/kernel/paravirt_inst.h
index 5cad6fb2ed19..64d6d810c64b 100644
--- a/arch/ia64/kernel/paravirt_inst.h
+++ b/arch/ia64/kernel/paravirt_inst.h
@@ -20,7 +20,9 @@
  *
  */
 
-#ifdef __IA64_ASM_PARAVIRTUALIZED_XEN
+#ifdef __IA64_ASM_PARAVIRTUALIZED_PVCHECK
+#include <asm/native/pvchk_inst.h>
+#elif defined(__IA64_ASM_PARAVIRTUALIZED_XEN)
 #include <asm/xen/inst.h>
 #include <asm/xen/minstate.h>
 #else
diff --git a/arch/ia64/kernel/pci-dma.c b/arch/ia64/kernel/pci-dma.c
new file mode 100644
index 000000000000..10a75b557650
--- /dev/null
+++ b/arch/ia64/kernel/pci-dma.c
@@ -0,0 +1,129 @@
+/*
+ * Dynamic DMA mapping support.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/dmar.h>
+#include <asm/iommu.h>
+#include <asm/machvec.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/machvec.h>
+#include <asm/system.h>
+
+#ifdef CONFIG_DMAR
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/page.h>
+#include <asm/iommu.h>
+
+dma_addr_t bad_dma_address __read_mostly;
+EXPORT_SYMBOL(bad_dma_address);
+
+static int iommu_sac_force __read_mostly;
+
+int no_iommu __read_mostly;
+#ifdef CONFIG_IOMMU_DEBUG
+int force_iommu __read_mostly = 1;
+#else
+int force_iommu __read_mostly;
+#endif
+
+/* Set this to 1 if there is a HW IOMMU in the system */
+int iommu_detected __read_mostly;
+
+/* Dummy device used for NULL arguments (normally ISA). Better would
+   be probably a smaller DMA mask, but this is bug-to-bug compatible
+   to i386. */
+struct device fallback_dev = {
+        .bus_id = "fallback device",
+        .coherent_dma_mask = DMA_32BIT_MASK,
+        .dma_mask = &fallback_dev.coherent_dma_mask,
+};
+
+void __init pci_iommu_alloc(void)
+{
+        /*
+         * The order of these functions is important for
+         * fall-back/fail-over reasons
+         */
+        detect_intel_iommu();
+
+#ifdef CONFIG_SWIOTLB
+        pci_swiotlb_init();
+#endif
+}
+
+static int __init pci_iommu_init(void)
+{
+        if (iommu_detected)
+                intel_iommu_init();
+
+        return 0;
+}
+
+/* Must execute after PCI subsystem */
+fs_initcall(pci_iommu_init);
+
+void pci_iommu_shutdown(void)
+{
+        return;
+}
+
+void __init
+iommu_dma_init(void)
+{
+        return;
+}
+
+struct dma_mapping_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
+int iommu_dma_supported(struct device *dev, u64 mask)
+{
+        struct dma_mapping_ops *ops = get_dma_ops(dev);
+
+#ifdef CONFIG_PCI
+        if (mask > 0xffffffff && forbid_dac > 0) {
+                dev_info(dev, "Disallowing DAC for device\n");
+                return 0;
+        }
+#endif
+
+        if (ops->dma_supported_op)
+                return ops->dma_supported_op(dev, mask);
+
+        /* Copied from i386. Doesn't make much sense, because it will
+           only work for pci_alloc_coherent.
+           The caller just has to use GFP_DMA in this case. */
+        if (mask < DMA_24BIT_MASK)
+                return 0;
+
+        /* Tell the device to use SAC when IOMMU force is on.  This
+           allows the driver to use cheaper accesses in some cases.
+
+           Problem with this is that if we overflow the IOMMU area and
+           return DAC as fallback address the device may not handle it
+           correctly.
+
+           As a special case some controllers have a 39bit address
+           mode that is as efficient as 32bit (aic79xx). Don't force
+           SAC for these.  Assume all masks <= 40 bits are of this
+           type. Normally this doesn't make any difference, but gives
+           more gentle handling of IOMMU overflow. */
+        if (iommu_sac_force && (mask >= DMA_40BIT_MASK)) {
+                dev_info(dev, "Force SAC with mask %lx\n", mask);
+                return 0;
+        }
+
+        return 1;
+}
+EXPORT_SYMBOL(iommu_dma_supported);
+
+#endif
diff --git a/arch/ia64/kernel/pci-swiotlb.c b/arch/ia64/kernel/pci-swiotlb.c
new file mode 100644
index 000000000000..16c50516dbc1
--- /dev/null
+++ b/arch/ia64/kernel/pci-swiotlb.c
@@ -0,0 +1,46 @@
+/* Glue code to lib/swiotlb.c */
+
+#include <linux/pci.h>
+#include <linux/cache.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/swiotlb.h>
+#include <asm/dma.h>
+#include <asm/iommu.h>
+#include <asm/machvec.h>
+
+int swiotlb __read_mostly;
+EXPORT_SYMBOL(swiotlb);
+
+struct dma_mapping_ops swiotlb_dma_ops = {
+        .mapping_error = swiotlb_dma_mapping_error,
+        .alloc_coherent = swiotlb_alloc_coherent,
+        .free_coherent = swiotlb_free_coherent,
+        .map_single = swiotlb_map_single,
+        .unmap_single = swiotlb_unmap_single,
+        .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+        .sync_single_for_device = swiotlb_sync_single_for_device,
+        .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
+        .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
+        .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+        .sync_sg_for_device = swiotlb_sync_sg_for_device,
+        .map_sg = swiotlb_map_sg,
+        .unmap_sg = swiotlb_unmap_sg,
+        .dma_supported_op = swiotlb_dma_supported,
+};
+
+void __init pci_swiotlb_init(void)
+{
+        if (!iommu_detected) {
+#ifdef CONFIG_IA64_GENERIC
+                swiotlb = 1;
+                printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
+                machvec_init("dig");
+                swiotlb_init();
+                dma_ops = &swiotlb_dma_ops;
+#else
+                panic("Unable to find Intel IOMMU");
+#endif
+        }
+}
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index fc8f3509df27..ada4605d1223 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -40,6 +40,7 @@
 #include <linux/capability.h>
 #include <linux/rcupdate.h>
 #include <linux/completion.h>
+#include <linux/tracehook.h>
 
 #include <asm/errno.h>
 #include <asm/intrinsics.h>
@@ -3684,7 +3685,7 @@ pfm_restart(pfm_context_t *ctx, void *arg, int count, struct pt_regs *regs)
 
                 PFM_SET_WORK_PENDING(task, 1);
 
-                tsk_set_notify_resume(task);
+                set_notify_resume(task);
 
                 /*
                  * XXX: send reschedule if task runs on another CPU
@@ -5044,8 +5045,6 @@ pfm_handle_work(void)
 
         PFM_SET_WORK_PENDING(current, 0);
 
-        tsk_clear_notify_resume(current);
-
         regs = task_pt_regs(current);
 
         /*
@@ -5414,7 +5413,7 @@ pfm_overflow_handler(struct task_struct *task, pfm_context_t *ctx, u64 pmc0, str
                          * when coming from ctxsw, current still points to the
                          * previous task, therefore we must work with task and not current.
                          */
-                        tsk_set_notify_resume(task);
+                        set_notify_resume(task);
                 }
                 /*
                  * defer until state is changed (shorten spin window). the context is locked
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 3ab8373103ec..c57162705147 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -28,6 +28,7 @@
 #include <linux/delay.h>
 #include <linux/kdebug.h>
 #include <linux/utsname.h>
+#include <linux/tracehook.h>
 
 #include <asm/cpu.h>
 #include <asm/delay.h>
@@ -160,21 +161,6 @@ show_regs (struct pt_regs *regs)
                 show_stack(NULL, NULL);
 }
 
-void tsk_clear_notify_resume(struct task_struct *tsk)
-{
-#ifdef CONFIG_PERFMON
-        if (tsk->thread.pfm_needs_checking)
-                return;
-#endif
-        if (test_ti_thread_flag(task_thread_info(tsk), TIF_RESTORE_RSE))
-                return;
-        clear_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME);
-}
-
-/*
- * do_notify_resume_user():
- *      Called from notify_resume_user at entry.S, with interrupts disabled.
- */
 void
 do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
 {
@@ -203,6 +189,11 @@ do_notify_resume_user(sigset_t *unused, struct sigscratch *scr, long in_syscall)
                 ia64_do_signal(scr, in_syscall);
         }
 
+        if (test_thread_flag(TIF_NOTIFY_RESUME)) {
+                clear_thread_flag(TIF_NOTIFY_RESUME);
+                tracehook_notify_resume(&scr->pt);
+        }
+
         /* copy user rbs to kernel rbs */
         if (unlikely(test_thread_flag(TIF_RESTORE_RSE))) {
                 local_irq_enable();     /* force interrupt enable */
@@ -251,7 +242,6 @@ default_idle (void)
 /* We don't actually take CPU down, just spin without interrupts. */
 static inline void play_dead(void)
 {
-        extern void ia64_cpu_local_tick (void);
         unsigned int this_cpu = smp_processor_id();
 
         /* Ack it */
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 2a9943b5947f..92c9689b7d97 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -22,6 +22,7 @@
 #include <linux/signal.h>
 #include <linux/regset.h>
 #include <linux/elf.h>
+#include <linux/tracehook.h>
 
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -603,7 +604,7 @@ void ia64_ptrace_stop(void)
 {
         if (test_and_set_tsk_thread_flag(current, TIF_RESTORE_RSE))
                 return;
-        tsk_set_notify_resume(current);
+        set_notify_resume(current);
         unw_init_running(do_sync_rbs, ia64_sync_user_rbs);
 }
 
@@ -613,7 +614,6 @@ void ia64_ptrace_stop(void)
 void ia64_sync_krbs(void)
 {
         clear_tsk_thread_flag(current, TIF_RESTORE_RSE);
-        tsk_clear_notify_resume(current);
 
         unw_init_running(do_sync_rbs, ia64_sync_kernel_rbs);
 }
@@ -644,7 +644,7 @@ ptrace_attach_sync_user_rbs (struct task_struct *child)
                 spin_lock_irq(&child->sighand->siglock);
                 if (child->state == TASK_STOPPED &&
                     !test_and_set_tsk_thread_flag(child, TIF_RESTORE_RSE)) {
-                        tsk_set_notify_resume(child);
+                        set_notify_resume(child);
 
                         child->state = TASK_TRACED;
                         stopped = 1;
@@ -1232,37 +1232,16 @@ arch_ptrace (struct task_struct *child, long request, long addr, long data)
 }
 
 
-static void
-syscall_trace (void)
-{
-        /*
-         * The 0x80 provides a way for the tracing parent to
-         * distinguish between a syscall stop and SIGTRAP delivery.
-         */
-        ptrace_notify(SIGTRAP
-                      | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
-
-        /*
-         * This isn't the same as continuing with a signal, but it
-         * will do for normal use.  strace only continues with a
-         * signal if the stopping signal is not SIGTRAP.  -brl
-         */
-        if (current->exit_code) {
-                send_sig(current->exit_code, current, 1);
-                current->exit_code = 0;
-        }
-}
-
 /* "asmlinkage" so the input arguments are preserved... */
 
-asmlinkage void
+asmlinkage long
 syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
                      long arg4, long arg5, long arg6, long arg7,
                      struct pt_regs regs)
 {
-        if (test_thread_flag(TIF_SYSCALL_TRACE) 
-            && (current->ptrace & PT_PTRACED))
-                syscall_trace();
+        if (test_thread_flag(TIF_SYSCALL_TRACE))
+                if (tracehook_report_syscall_entry(&regs))
+                        return -ENOSYS;
 
         /* copy user rbs to kernel rbs */
         if (test_thread_flag(TIF_RESTORE_RSE))
@@ -1283,6 +1262,7 @@ syscall_trace_enter (long arg0, long arg1, long arg2, long arg3,
                 audit_syscall_entry(arch, syscall, arg0, arg1, arg2, arg3);
         }
 
+        return 0;
 }
 
 /* "asmlinkage" so the input arguments are preserved... */
@@ -1292,6 +1272,8 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
                      long arg4, long arg5, long arg6, long arg7,
                      struct pt_regs regs)
 {
+        int step;
+
         if (unlikely(current->audit_context)) {
                 int success = AUDITSC_RESULT(regs.r10);
                 long result = regs.r8;
@@ -1301,10 +1283,9 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
                 audit_syscall_exit(success, result);
         }
 
-        if ((test_thread_flag(TIF_SYSCALL_TRACE)
-            || test_thread_flag(TIF_SINGLESTEP))
-            && (current->ptrace & PT_PTRACED))
-                syscall_trace();
+        step = test_thread_flag(TIF_SINGLESTEP);
+        if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+                tracehook_report_syscall_exit(&regs, step);
 
         /* copy user rbs to kernel rbs */
         if (test_thread_flag(TIF_RESTORE_RSE))
@@ -1940,7 +1921,7 @@ gpregs_writeback(struct task_struct *target,
 {
         if (test_and_set_tsk_thread_flag(target, TIF_RESTORE_RSE))
                 return 0;
-        tsk_set_notify_resume(target);
+        set_notify_resume(target);
         return do_regset_call(do_gpregs_writeback, target, regset, 0, 0,
                 NULL, NULL);
 }
@@ -2199,3 +2180,68 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *tsk)
 #endif
         return &user_ia64_view;
 }
+
+struct syscall_get_set_args {
+        unsigned int i;
+        unsigned int n;
+        unsigned long *args;
+        struct pt_regs *regs;
+        int rw;
+};
+
+static void syscall_get_set_args_cb(struct unw_frame_info *info, void *data)
+{
+        struct syscall_get_set_args *args = data;
+        struct pt_regs *pt = args->regs;
+        unsigned long *krbs, cfm, ndirty;
+        int i, count;
+
+        if (unw_unwind_to_user(info) < 0)
+                return;
+
+        cfm = pt->cr_ifs;
+        krbs = (unsigned long *)info->task + IA64_RBS_OFFSET/8;
+        ndirty = ia64_rse_num_regs(krbs, krbs + (pt->loadrs >> 19));
+
+        count = 0;
+        if (in_syscall(pt))
+                count = min_t(int, args->n, cfm & 0x7f);
+
+        for (i = 0; i < count; i++) {
+                if (args->rw)
+                        *ia64_rse_skip_regs(krbs, ndirty + i + args->i) =
+                                args->args[i];
+                else
+                        args->args[i] = *ia64_rse_skip_regs(krbs,
+                                ndirty + i + args->i);
+        }
+
+        if (!args->rw) {
+                while (i < args->n) {
+                        args->args[i] = 0;
+                        i++;
+                }
+        }
+}
+
+void ia64_syscall_get_set_arguments(struct task_struct *task,
+        struct pt_regs *regs, unsigned int i, unsigned int n,
+        unsigned long *args, int rw)
+{
+        struct syscall_get_set_args data = {
+                .i = i,
+                .n = n,
+                .args = args,
+                .regs = regs,
+                .rw = rw,
+        };
+
+        if (task == current)
+                unw_init_running(syscall_get_set_args_cb, &data);
+        else {
+                struct unw_frame_info ufi;
+                memset(&ufi, 0, sizeof(ufi));
+                unw_init_from_blocked_task(&ufi, task);
+                syscall_get_set_args_cb(&ufi, &data);
+        }
+}
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 916ba898237f..ae7911702bf8 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -116,6 +116,13 @@ unsigned int num_io_spaces;
  */
 #define I_CACHE_STRIDE_SHIFT    5       /* Safest way to go: 32 bytes by 32 bytes */
 unsigned long ia64_i_cache_stride_shift = ~0;
+/*
+ * "clflush_cache_range()" needs to know what processor dependent stride size to
+ * use when it flushes cache lines including both d-cache and i-cache.
+ */
+/* Safest way to go: 32 bytes by 32 bytes */
+#define CACHE_STRIDE_SHIFT      5
+unsigned long ia64_cache_stride_shift = ~0;
 
 /*
  * The merge_mask variable needs to be set to (max(iommu_page_size(iommu)) - 1).  This
@@ -852,13 +859,14 @@ setup_per_cpu_areas (void)
 }
 
 /*
- * Calculate the max. cache line size.
+ * Do the following calculations:
  *
- * In addition, the minimum of the i-cache stride sizes is calculated for
- * "flush_icache_range()".
+ * 1. the max. cache line size.
+ * 2. the minimum of the i-cache stride sizes for "flush_icache_range()".
+ * 3. the minimum of the cache stride sizes for "clflush_cache_range()".
  */
 static void __cpuinit
-get_max_cacheline_size (void)
+get_cache_info(void)
 {
         unsigned long line_size, max = 1;
         u64 l, levels, unique_caches;
@@ -872,12 +880,14 @@ get_max_cacheline_size (void)
                 max = SMP_CACHE_BYTES;
                 /* Safest setup for "flush_icache_range()" */
                 ia64_i_cache_stride_shift = I_CACHE_STRIDE_SHIFT;
+                /* Safest setup for "clflush_cache_range()" */
+                ia64_cache_stride_shift = CACHE_STRIDE_SHIFT;
                 goto out;
         }
 
         for (l = 0; l < levels; ++l) {
-                status = ia64_pal_cache_config_info(l, /* cache_type (data_or_unified)= */ 2,
-                                                    &cci);
+                /* cache_type (data_or_unified)=2 */
+                status = ia64_pal_cache_config_info(l, 2, &cci);
                 if (status != 0) {
                         printk(KERN_ERR
                                "%s: ia64_pal_cache_config_info(l=%lu, 2) failed (status=%ld)\n",
@@ -885,15 +895,21 @@ get_max_cacheline_size (void)
                         max = SMP_CACHE_BYTES;
                         /* The safest setup for "flush_icache_range()" */
                         cci.pcci_stride = I_CACHE_STRIDE_SHIFT;
+                        /* The safest setup for "clflush_cache_range()" */
+                        ia64_cache_stride_shift = CACHE_STRIDE_SHIFT;
                         cci.pcci_unified = 1;
+                } else {
+                        if (cci.pcci_stride < ia64_cache_stride_shift)
+                                ia64_cache_stride_shift = cci.pcci_stride;
+
+                        line_size = 1 << cci.pcci_line_size;
+                        if (line_size > max)
+                                max = line_size;
                 }
-                line_size = 1 << cci.pcci_line_size;
-                if (line_size > max)
-                        max = line_size;
+
                 if (!cci.pcci_unified) {
-                        status = ia64_pal_cache_config_info(l,
-                                                    /* cache_type (instruction)= */ 1,
-                                                    &cci);
+                        /* cache_type (instruction)=1*/
+                        status = ia64_pal_cache_config_info(l, 1, &cci);
                         if (status != 0) {
                                 printk(KERN_ERR
                                 "%s: ia64_pal_cache_config_info(l=%lu, 1) failed (status=%ld)\n",
@@ -947,7 +963,7 @@ cpu_init (void)
         }
 #endif
 
-        get_max_cacheline_size();
+        get_cache_info();
 
         /*
          * We can't pass "local_cpu_data" to identify_cpu() because we haven't called
diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index 19c5a78636fc..e12500a9c443 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/sched.h>
 #include <linux/signal.h>
 #include <linux/smp.h>
@@ -439,6 +440,13 @@ handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigse
                 sigaddset(&current->blocked, sig);
         recalc_sigpending();
         spin_unlock_irq(&current->sighand->siglock);
+
+        /*
+         * Let tracing know that we've done the handler setup.
+         */
+        tracehook_signal_handler(sig, info, ka, &scr->pt,
+                                 test_thread_flag(TIF_SINGLESTEP));
+
         return 1;
 }
 
diff --git a/arch/ia64/lib/flush.S b/arch/ia64/lib/flush.S
index 2a0d27f2f21b..1d8c88860063 100644
--- a/arch/ia64/lib/flush.S
+++ b/arch/ia64/lib/flush.S
@@ -60,3 +60,58 @@ GLOBAL_ENTRY(flush_icache_range)
         mov     ar.lc=r3                // restore ar.lc
         br.ret.sptk.many rp
 END(flush_icache_range)
+
+        /*
+         * clflush_cache_range(start,size)
+         *
+         *      Flush cache lines from start to start+size-1.
+         *
+         *      Must deal with range from start to start+size-1 but nothing else
+         *      (need to be careful not to touch addresses that may be
+         *      unmapped).
+         *
+         *      Note: "in0" and "in1" are preserved for debugging purposes.
+         */
+        .section .kprobes.text,"ax"
+GLOBAL_ENTRY(clflush_cache_range)
+
+        .prologue
+        alloc   r2=ar.pfs,2,0,0,0
+        movl    r3=ia64_cache_stride_shift
+        mov     r21=1
+        add     r22=in1,in0
+        ;;
+        ld8     r20=[r3]                // r20: stride shift
+        sub     r22=r22,r0,1            // last byte address
+        ;;
+        shr.u   r23=in0,r20             // start / (stride size)
+        shr.u   r22=r22,r20             // (last byte address) / (stride size)
+        shl     r21=r21,r20             // r21: stride size of the i-cache(s)
+        ;;
+        sub     r8=r22,r23              // number of strides - 1
+        shl     r24=r23,r20             // r24: addresses for "fc" =
+                                        //      "start" rounded down to stride
+                                        //      boundary
+        .save   ar.lc,r3
+        mov     r3=ar.lc                // save ar.lc
+        ;;
+
+        .body
+        mov     ar.lc=r8
+        ;;
+        /*
+         * 32 byte aligned loop, even number of (actually 2) bundles
+         */
+.Loop_fc:
+        fc      r24             // issuable on M0 only
+        add     r24=r21,r24     // we flush "stride size" bytes per iteration
+        nop.i   0
+        br.cloop.sptk.few .Loop_fc
+        ;;
+        sync.i
+        ;;
+        srlz.i
+        ;;
+        mov     ar.lc=r3                // restore ar.lc
+        br.ret.sptk.many rp
+END(clflush_cache_range)
diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c
index 8caf42471f0d..bd9818a36b47 100644
--- a/arch/ia64/mm/tlb.c
+++ b/arch/ia64/mm/tlb.c
@@ -362,9 +362,13 @@ ia64_tlb_init (void)
                 per_cpu(ia64_tr_num, cpu) =
                                 vm_info_1.pal_vm_info_1_s.max_dtr_entry+1;
         if (per_cpu(ia64_tr_num, cpu) > IA64_TR_ALLOC_MAX) {
+                static int justonce = 1;
                 per_cpu(ia64_tr_num, cpu) = IA64_TR_ALLOC_MAX;
-                printk(KERN_DEBUG "TR register number exceeds IA64_TR_ALLOC_MAX!"
-                        "IA64_TR_ALLOC_MAX should be extended\n");
+                if (justonce) {
+                        justonce = 0;
+                        printk(KERN_DEBUG "TR register number exceeds "
+                               "IA64_TR_ALLOC_MAX!\n");
+                }
         }
 }
 
diff --git a/arch/ia64/scripts/pvcheck.sed b/arch/ia64/scripts/pvcheck.sed
new file mode 100644
index 000000000000..ba66ac2e4c60
--- /dev/null
+++ b/arch/ia64/scripts/pvcheck.sed
@@ -0,0 +1,32 @@
+#
+# Checker for paravirtualizations of privileged operations.
+#
+s/ssm.*psr\.ic.*/.warning \"ssm psr.ic should not be used directly\"/g
+s/rsm.*psr\.ic.*/.warning \"rsm psr.ic should not be used directly\"/g
+s/ssm.*psr\.i.*/.warning \"ssm psr.i should not be used directly\"/g
+s/rsm.*psr\.i.*/.warning \"rsm psr.i should not be used directly\"/g
+s/ssm.*psr\.dt.*/.warning \"ssm psr.dt should not be used directly\"/g
+s/rsm.*psr\.dt.*/.warning \"rsm psr.dt should not be used directly\"/g
+s/mov.*=.*cr\.ifa/.warning \"cr.ifa should not used directly\"/g
+s/mov.*=.*cr\.itir/.warning \"cr.itir should not used directly\"/g
+s/mov.*=.*cr\.isr/.warning \"cr.isr should not used directly\"/g
+s/mov.*=.*cr\.iha/.warning \"cr.iha should not used directly\"/g
+s/mov.*=.*cr\.ipsr/.warning \"cr.ipsr should not used directly\"/g
+s/mov.*=.*cr\.iim/.warning \"cr.iim should not used directly\"/g
+s/mov.*=.*cr\.iip/.warning \"cr.iip should not used directly\"/g
+s/mov.*=.*cr\.ivr/.warning \"cr.ivr should not used directly\"/g
+s/mov.*=[^\.]*psr/.warning \"psr should not used directly\"/g   # avoid ar.fpsr
+s/mov.*=.*ar\.eflags/.warning \"ar.eflags should not used directly\"/g
+s/mov.*cr\.ifa.*=.*/.warning \"cr.ifa should not used directly\"/g
+s/mov.*cr\.itir.*=.*/.warning \"cr.itir should not used directly\"/g
+s/mov.*cr\.iha.*=.*/.warning \"cr.iha should not used directly\"/g
+s/mov.*cr\.ipsr.*=.*/.warning \"cr.ipsr should not used directly\"/g
+s/mov.*cr\.ifs.*=.*/.warning \"cr.ifs should not used directly\"/g
+s/mov.*cr\.iip.*=.*/.warning \"cr.iip should not used directly\"/g
+s/mov.*cr\.kr.*=.*/.warning \"cr.kr should not used directly\"/g
+s/mov.*ar\.eflags.*=.*/.warning \"ar.eflags should not used directly\"/g
+s/itc\.i.*/.warning \"itc.i should not be used directly.\"/g
+s/itc\.d.*/.warning \"itc.d should not be used directly.\"/g
+s/bsw\.0/.warning \"bsw.0 should not be used directly.\"/g
+s/bsw\.1/.warning \"bsw.1 should not be used directly.\"/g
+s/ptc\.ga.*/.warning \"ptc.ga should not be used directly.\"/g
diff --git a/arch/ia64/xen/Kconfig b/arch/ia64/xen/Kconfig
new file mode 100644
index 000000000000..f1683a20275b
--- /dev/null
+++ b/arch/ia64/xen/Kconfig
@@ -0,0 +1,26 @@
+#
+# This Kconfig describes xen/ia64 options
+#
+
+config XEN
+        bool "Xen hypervisor support"
+        default y
+        depends on PARAVIRT && MCKINLEY && IA64_PAGE_SIZE_16KB && EXPERIMENTAL
+        select XEN_XENCOMM
+        select NO_IDLE_HZ
+
+        # those are required to save/restore.
+        select ARCH_SUSPEND_POSSIBLE
+        select SUSPEND
+        select PM_SLEEP
+        help
+          Enable Xen hypervisor support.  Resulting kernel runs
+          both as a guest OS on Xen and natively on hardware.
+
+config XEN_XENCOMM
+        depends on XEN
+        bool
+
+config NO_IDLE_HZ
+        depends on XEN
+        bool
diff --git a/arch/ia64/xen/Makefile b/arch/ia64/xen/Makefile
new file mode 100644
index 000000000000..0ad0224693d9
--- /dev/null
+++ b/arch/ia64/xen/Makefile
@@ -0,0 +1,22 @@
+#
+# Makefile for Xen components
+#
+
+obj-y := hypercall.o xenivt.o xensetup.o xen_pv_ops.o irq_xen.o \
+         hypervisor.o xencomm.o xcom_hcall.o grant-table.o time.o suspend.o
+
+obj-$(CONFIG_IA64_GENERIC) += machvec.o
+
+AFLAGS_xenivt.o += -D__IA64_ASM_PARAVIRTUALIZED_XEN
+
+# xen multi compile
+ASM_PARAVIRT_MULTI_COMPILE_SRCS = ivt.S entry.S
+ASM_PARAVIRT_OBJS = $(addprefix xen-,$(ASM_PARAVIRT_MULTI_COMPILE_SRCS:.S=.o))
+obj-y += $(ASM_PARAVIRT_OBJS)
+define paravirtualized_xen
+AFLAGS_$(1) += -D__IA64_ASM_PARAVIRTUALIZED_XEN
+endef
+$(foreach o,$(ASM_PARAVIRT_OBJS),$(eval $(call paravirtualized_xen,$(o))))
+
+$(obj)/xen-%.o: $(src)/../kernel/%.S FORCE
+        $(call if_changed_dep,as_o_S)
diff --git a/arch/ia64/xen/grant-table.c b/arch/ia64/xen/grant-table.c
new file mode 100644
index 000000000000..777dd9a9108b
--- /dev/null
+++ b/arch/ia64/xen/grant-table.c
@@ -0,0 +1,155 @@
+/******************************************************************************
+ * arch/ia64/xen/grant-table.c
+ *
+ * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/memory.h>
+#include <xen/grant_table.h>
+
+#include <asm/xen/hypervisor.h>
+
+struct vm_struct *xen_alloc_vm_area(unsigned long size)
+{
+        int order;
+        unsigned long virt;
+        unsigned long nr_pages;
+        struct vm_struct *area;
+
+        order = get_order(size);
+        virt = __get_free_pages(GFP_KERNEL, order);
+        if (virt == 0)
+                goto err0;
+        nr_pages = 1 << order;
+        scrub_pages(virt, nr_pages);
+
+        area = kmalloc(sizeof(*area), GFP_KERNEL);
+        if (area == NULL)
+                goto err1;
+
+        area->flags = VM_IOREMAP;
+        area->addr = (void *)virt;
+        area->size = size;
+        area->pages = NULL;
+        area->nr_pages = nr_pages;
+        area->phys_addr = 0;    /* xenbus_map_ring_valloc uses this field!  */
+
+        return area;
+
+err1:
+        free_pages(virt, order);
+err0:
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(xen_alloc_vm_area);
+
+void xen_free_vm_area(struct vm_struct *area)
+{
+        unsigned int order = get_order(area->size);
+        unsigned long i;
+        unsigned long phys_addr = __pa(area->addr);
+
+        /* This area is used for foreign page mappping.
+         * So underlying machine page may not be assigned. */
+        for (i = 0; i < (1 << order); i++) {
+                unsigned long ret;
+                unsigned long gpfn = (phys_addr >> PAGE_SHIFT) + i;
+                struct xen_memory_reservation reservation = {
+                        .nr_extents   = 1,
+                        .address_bits = 0,
+                        .extent_order = 0,
+                        .domid        = DOMID_SELF
+                };
+                set_xen_guest_handle(reservation.extent_start, &gpfn);
+                ret = HYPERVISOR_memory_op(XENMEM_populate_physmap,
+                                           &reservation);
+                BUG_ON(ret != 1);
+        }
+        free_pages((unsigned long)area->addr, order);
+        kfree(area);
+}
+EXPORT_SYMBOL_GPL(xen_free_vm_area);
+
+
+/****************************************************************************
+ * grant table hack
+ * cmd: GNTTABOP_xxx
+ */
+
+int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
+                           unsigned long max_nr_gframes,
+                           struct grant_entry **__shared)
+{
+        *__shared = __va(frames[0] << PAGE_SHIFT);
+        return 0;
+}
+
+void arch_gnttab_unmap_shared(struct grant_entry *shared,
+                              unsigned long nr_gframes)
+{
+        /* nothing */
+}
+
+static void
+gnttab_map_grant_ref_pre(struct gnttab_map_grant_ref *uop)
+{
+        uint32_t flags;
+
+        flags = uop->flags;
+
+        if (flags & GNTMAP_host_map) {
+                if (flags & GNTMAP_application_map) {
+                        printk(KERN_DEBUG
+                               "GNTMAP_application_map is not supported yet: "
+                               "flags 0x%x\n", flags);
+                        BUG();
+                }
+                if (flags & GNTMAP_contains_pte) {
+                        printk(KERN_DEBUG
+                               "GNTMAP_contains_pte is not supported yet: "
+                               "flags 0x%x\n", flags);
+                        BUG();
+                }
+        } else if (flags & GNTMAP_device_map) {
+                printk("GNTMAP_device_map is not supported yet 0x%x\n", flags);
+                BUG();  /* not yet. actually this flag is not used. */
+        } else {
+                BUG();
+        }
+}
+
+int
+HYPERVISOR_grant_table_op(unsigned int cmd, void *uop, unsigned int count)
+{
+        if (cmd == GNTTABOP_map_grant_ref) {
+                unsigned int i;
+                for (i = 0; i < count; i++) {
+                        gnttab_map_grant_ref_pre(
+                                (struct gnttab_map_grant_ref *)uop + i);
+                }
+        }
+        return xencomm_hypercall_grant_table_op(cmd, uop, count);
+}
+
+EXPORT_SYMBOL(HYPERVISOR_grant_table_op);
diff --git a/arch/ia64/xen/hypercall.S b/arch/ia64/xen/hypercall.S
new file mode 100644
index 000000000000..d4ff0b9e79f1
--- /dev/null
+++ b/arch/ia64/xen/hypercall.S
@@ -0,0 +1,91 @@
+/*
+ * Support routines for Xen hypercalls
+ *
+ * Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@hp.com>
+ * Copyright (C) 2008 Yaozu (Eddie) Dong <eddie.dong@intel.com>
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/intrinsics.h>
+#include <asm/xen/privop.h>
+
+/*
+ * Hypercalls without parameter.
+ */
+#define __HCALL0(name,hcall)            \
+        GLOBAL_ENTRY(name);             \
+        break   hcall;                  \
+        br.ret.sptk.many rp;            \
+        END(name)
+
+/*
+ * Hypercalls with 1 parameter.
+ */
+#define __HCALL1(name,hcall)            \
+        GLOBAL_ENTRY(name);             \
+        mov r8=r32;                     \
+        break   hcall;                  \
+        br.ret.sptk.many rp;            \
+        END(name)
+
+/*
+ * Hypercalls with 2 parameters.
+ */
+#define __HCALL2(name,hcall)            \
+        GLOBAL_ENTRY(name);             \
+        mov r8=r32;                     \
+        mov r9=r33;                     \
+        break   hcall;                  \
+        br.ret.sptk.many rp;            \
+        END(name)
+
+__HCALL0(xen_get_psr, HYPERPRIVOP_GET_PSR)
+__HCALL0(xen_get_ivr, HYPERPRIVOP_GET_IVR)
+__HCALL0(xen_get_tpr, HYPERPRIVOP_GET_TPR)
+__HCALL0(xen_hyper_ssm_i, HYPERPRIVOP_SSM_I)
+
+__HCALL1(xen_set_tpr, HYPERPRIVOP_SET_TPR)
+__HCALL1(xen_eoi, HYPERPRIVOP_EOI)
+__HCALL1(xen_thash, HYPERPRIVOP_THASH)
+__HCALL1(xen_set_itm, HYPERPRIVOP_SET_ITM)
+__HCALL1(xen_get_rr, HYPERPRIVOP_GET_RR)
+__HCALL1(xen_fc, HYPERPRIVOP_FC)
+__HCALL1(xen_get_cpuid, HYPERPRIVOP_GET_CPUID)
+__HCALL1(xen_get_pmd, HYPERPRIVOP_GET_PMD)
+
+__HCALL2(xen_ptcga, HYPERPRIVOP_PTC_GA)
+__HCALL2(xen_set_rr, HYPERPRIVOP_SET_RR)
+__HCALL2(xen_set_kr, HYPERPRIVOP_SET_KR)
+
+#ifdef CONFIG_IA32_SUPPORT
+__HCALL1(xen_get_eflag, HYPERPRIVOP_GET_EFLAG)
+__HCALL1(xen_set_eflag, HYPERPRIVOP_SET_EFLAG)  // refer SDM vol1 3.1.8
+#endif /* CONFIG_IA32_SUPPORT */
+
+GLOBAL_ENTRY(xen_set_rr0_to_rr4)
+        mov r8=r32
+        mov r9=r33
+        mov r10=r34
+        mov r11=r35
+        mov r14=r36
+        XEN_HYPER_SET_RR0_TO_RR4
+        br.ret.sptk.many rp
+        ;;
+END(xen_set_rr0_to_rr4)
+
+GLOBAL_ENTRY(xen_send_ipi)
+        mov r14=r32
+        mov r15=r33
+        mov r2=0x400
+        break 0x1000
+        ;;
+        br.ret.sptk.many rp
+        ;;
+END(xen_send_ipi)
+
+GLOBAL_ENTRY(__hypercall)
+        mov r2=r37
+        break 0x1000
+        br.ret.sptk.many b0
+        ;;
+END(__hypercall)
diff --git a/arch/ia64/xen/hypervisor.c b/arch/ia64/xen/hypervisor.c
new file mode 100644
index 000000000000..cac4d97c0b5a
--- /dev/null
+++ b/arch/ia64/xen/hypervisor.c
@@ -0,0 +1,96 @@
+/******************************************************************************
+ * arch/ia64/xen/hypervisor.c
+ *
+ * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/efi.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/privop.h>
+
+#include "irq_xen.h"
+
+struct shared_info *HYPERVISOR_shared_info __read_mostly =
+        (struct shared_info *)XSI_BASE;
+EXPORT_SYMBOL(HYPERVISOR_shared_info);
+
+DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
+
+struct start_info *xen_start_info;
+EXPORT_SYMBOL(xen_start_info);
+
+EXPORT_SYMBOL(xen_domain_type);
+
+EXPORT_SYMBOL(__hypercall);
+
+/* Stolen from arch/x86/xen/enlighten.c */
+/*
+ * Flag to determine whether vcpu info placement is available on all
+ * VCPUs.  We assume it is to start with, and then set it to zero on
+ * the first failure.  This is because it can succeed on some VCPUs
+ * and not others, since it can involve hypervisor memory allocation,
+ * or because the guest failed to guarantee all the appropriate
+ * constraints on all VCPUs (ie buffer can't cross a page boundary).
+ *
+ * Note that any particular CPU may be using a placed vcpu structure,
+ * but we can only optimise if the all are.
+ *
+ * 0: not available, 1: available
+ */
+
+static void __init xen_vcpu_setup(int cpu)
+{
+        /*
+         * WARNING:
+         * before changing MAX_VIRT_CPUS,
+         * check that shared_info fits on a page
+         */
+        BUILD_BUG_ON(sizeof(struct shared_info) > PAGE_SIZE);
+        per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+}
+
+void __init xen_setup_vcpu_info_placement(void)
+{
+        int cpu;
+
+        for_each_possible_cpu(cpu)
+                xen_vcpu_setup(cpu);
+}
+
+void __cpuinit
+xen_cpu_init(void)
+{
+        xen_smp_intr_init();
+}
+
+/**************************************************************************
+ * opt feature
+ */
+void
+xen_ia64_enable_opt_feature(void)
+{
+        /* Enable region 7 identity map optimizations in Xen */
+        struct xen_ia64_opt_feature optf;
+
+        optf.cmd = XEN_IA64_OPTF_IDENT_MAP_REG7;
+        optf.on = XEN_IA64_OPTF_ON;
+        optf.pgprot = pgprot_val(PAGE_KERNEL);
+        optf.key = 0;   /* No key on linux. */
+        HYPERVISOR_opt_feature(&optf);
+}
diff --git a/arch/ia64/xen/irq_xen.c b/arch/ia64/xen/irq_xen.c
new file mode 100644
index 000000000000..af93aadb68bb
--- /dev/null
+++ b/arch/ia64/xen/irq_xen.c
@@ -0,0 +1,435 @@
+/******************************************************************************
+ * arch/ia64/xen/irq_xen.c
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/cpu.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/callback.h>
+#include <xen/events.h>
+
+#include <asm/xen/privop.h>
+
+#include "irq_xen.h"
+
+/***************************************************************************
+ * pv_irq_ops
+ * irq operations
+ */
+
+static int
+xen_assign_irq_vector(int irq)
+{
+        struct physdev_irq irq_op;
+
+        irq_op.irq = irq;
+        if (HYPERVISOR_physdev_op(PHYSDEVOP_alloc_irq_vector, &irq_op))
+                return -ENOSPC;
+
+        return irq_op.vector;
+}
+
+static void
+xen_free_irq_vector(int vector)
+{
+        struct physdev_irq irq_op;
+
+        if (vector < IA64_FIRST_DEVICE_VECTOR ||
+            vector > IA64_LAST_DEVICE_VECTOR)
+                return;
+
+        irq_op.vector = vector;
+        if (HYPERVISOR_physdev_op(PHYSDEVOP_free_irq_vector, &irq_op))
+                printk(KERN_WARNING "%s: xen_free_irq_vecotr fail vector=%d\n",
+                       __func__, vector);
+}
+
+
+static DEFINE_PER_CPU(int, timer_irq) = -1;
+static DEFINE_PER_CPU(int, ipi_irq) = -1;
+static DEFINE_PER_CPU(int, resched_irq) = -1;
+static DEFINE_PER_CPU(int, cmc_irq) = -1;
+static DEFINE_PER_CPU(int, cmcp_irq) = -1;
+static DEFINE_PER_CPU(int, cpep_irq) = -1;
+#define NAME_SIZE       15
+static DEFINE_PER_CPU(char[NAME_SIZE], timer_name);
+static DEFINE_PER_CPU(char[NAME_SIZE], ipi_name);
+static DEFINE_PER_CPU(char[NAME_SIZE], resched_name);
+static DEFINE_PER_CPU(char[NAME_SIZE], cmc_name);
+static DEFINE_PER_CPU(char[NAME_SIZE], cmcp_name);
+static DEFINE_PER_CPU(char[NAME_SIZE], cpep_name);
+#undef NAME_SIZE
+
+struct saved_irq {
+        unsigned int irq;
+        struct irqaction *action;
+};
+/* 16 should be far optimistic value, since only several percpu irqs
+ * are registered early.
+ */
+#define MAX_LATE_IRQ    16
+static struct saved_irq saved_percpu_irqs[MAX_LATE_IRQ];
+static unsigned short late_irq_cnt;
+static unsigned short saved_irq_cnt;
+static int xen_slab_ready;
+
+#ifdef CONFIG_SMP
+/* Dummy stub. Though we may check XEN_RESCHEDULE_VECTOR before __do_IRQ,
+ * it ends up to issue several memory accesses upon percpu data and
+ * thus adds unnecessary traffic to other paths.
+ */
+static irqreturn_t
+xen_dummy_handler(int irq, void *dev_id)
+{
+
+        return IRQ_HANDLED;
+}
+
+static struct irqaction xen_ipi_irqaction = {
+        .handler =      handle_IPI,
+        .flags =        IRQF_DISABLED,
+        .name =         "IPI"
+};
+
+static struct irqaction xen_resched_irqaction = {
+        .handler =      xen_dummy_handler,
+        .flags =        IRQF_DISABLED,
+        .name =         "resched"
+};
+
+static struct irqaction xen_tlb_irqaction = {
+        .handler =      xen_dummy_handler,
+        .flags =        IRQF_DISABLED,
+        .name =         "tlb_flush"
+};
+#endif
+
+/*
+ * This is xen version percpu irq registration, which needs bind
+ * to xen specific evtchn sub-system. One trick here is that xen
+ * evtchn binding interface depends on kmalloc because related
+ * port needs to be freed at device/cpu down. So we cache the
+ * registration on BSP before slab is ready and then deal them
+ * at later point. For rest instances happening after slab ready,
+ * we hook them to xen evtchn immediately.
+ *
+ * FIXME: MCA is not supported by far, and thus "nomca" boot param is
+ * required.
+ */
+static void
+__xen_register_percpu_irq(unsigned int cpu, unsigned int vec,
+                        struct irqaction *action, int save)
+{
+        irq_desc_t *desc;
+        int irq = 0;
+
+        if (xen_slab_ready) {
+                switch (vec) {
+                case IA64_TIMER_VECTOR:
+                        snprintf(per_cpu(timer_name, cpu),
+                                 sizeof(per_cpu(timer_name, cpu)),
+                                 "%s%d", action->name, cpu);
+                        irq = bind_virq_to_irqhandler(VIRQ_ITC, cpu,
+                                action->handler, action->flags,
+                                per_cpu(timer_name, cpu), action->dev_id);
+                        per_cpu(timer_irq, cpu) = irq;
+                        break;
+                case IA64_IPI_RESCHEDULE:
+                        snprintf(per_cpu(resched_name, cpu),
+                                 sizeof(per_cpu(resched_name, cpu)),
+                                 "%s%d", action->name, cpu);
+                        irq = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, cpu,
+                                action->handler, action->flags,
+                                per_cpu(resched_name, cpu), action->dev_id);
+                        per_cpu(resched_irq, cpu) = irq;
+                        break;
+                case IA64_IPI_VECTOR:
+                        snprintf(per_cpu(ipi_name, cpu),
+                                 sizeof(per_cpu(ipi_name, cpu)),
+                                 "%s%d", action->name, cpu);
+                        irq = bind_ipi_to_irqhandler(XEN_IPI_VECTOR, cpu,
+                                action->handler, action->flags,
+                                per_cpu(ipi_name, cpu), action->dev_id);
+                        per_cpu(ipi_irq, cpu) = irq;
+                        break;
+                case IA64_CMC_VECTOR:
+                        snprintf(per_cpu(cmc_name, cpu),
+                                 sizeof(per_cpu(cmc_name, cpu)),
+                                 "%s%d", action->name, cpu);
+                        irq = bind_virq_to_irqhandler(VIRQ_MCA_CMC, cpu,
+                                                      action->handler,
+                                                      action->flags,
+                                                      per_cpu(cmc_name, cpu),
+                                                      action->dev_id);
+                        per_cpu(cmc_irq, cpu) = irq;
+                        break;
+                case IA64_CMCP_VECTOR:
+                        snprintf(per_cpu(cmcp_name, cpu),
+                                 sizeof(per_cpu(cmcp_name, cpu)),
+                                 "%s%d", action->name, cpu);
+                        irq = bind_ipi_to_irqhandler(XEN_CMCP_VECTOR, cpu,
+                                                     action->handler,
+                                                     action->flags,
+                                                     per_cpu(cmcp_name, cpu),
+                                                     action->dev_id);
+                        per_cpu(cmcp_irq, cpu) = irq;
+                        break;
+                case IA64_CPEP_VECTOR:
+                        snprintf(per_cpu(cpep_name, cpu),
+                                 sizeof(per_cpu(cpep_name, cpu)),
+                                 "%s%d", action->name, cpu);
+                        irq = bind_ipi_to_irqhandler(XEN_CPEP_VECTOR, cpu,
+                                                     action->handler,
+                                                     action->flags,
+                                                     per_cpu(cpep_name, cpu),
+                                                     action->dev_id);
+                        per_cpu(cpep_irq, cpu) = irq;
+                        break;
+                case IA64_CPE_VECTOR:
+                case IA64_MCA_RENDEZ_VECTOR:
+                case IA64_PERFMON_VECTOR:
+                case IA64_MCA_WAKEUP_VECTOR:
+                case IA64_SPURIOUS_INT_VECTOR:
+                        /* No need to complain, these aren't supported. */
+                        break;
+                default:
+                        printk(KERN_WARNING "Percpu irq %d is unsupported "
+                               "by xen!\n", vec);
+                        break;
+                }
+                BUG_ON(irq < 0);
+
+                if (irq > 0) {
+                        /*
+                         * Mark percpu.  Without this, migrate_irqs() will
+                         * mark the interrupt for migrations and trigger it
+                         * on cpu hotplug.
+                         */
+                        desc = irq_desc + irq;
+                        desc->status |= IRQ_PER_CPU;
+                }
+        }
+
+        /* For BSP, we cache registered percpu irqs, and then re-walk
+         * them when initializing APs
+         */
+        if (!cpu && save) {
+                BUG_ON(saved_irq_cnt == MAX_LATE_IRQ);
+                saved_percpu_irqs[saved_irq_cnt].irq = vec;
+                saved_percpu_irqs[saved_irq_cnt].action = action;
+                saved_irq_cnt++;
+                if (!xen_slab_ready)
+                        late_irq_cnt++;
+        }
+}
+
+static void
+xen_register_percpu_irq(ia64_vector vec, struct irqaction *action)
+{
+        __xen_register_percpu_irq(smp_processor_id(), vec, action, 1);
+}
+
+static void
+xen_bind_early_percpu_irq(void)
+{
+        int i;
+
+        xen_slab_ready = 1;
+        /* There's no race when accessing this cached array, since only
+         * BSP will face with such step shortly
+         */
+        for (i = 0; i < late_irq_cnt; i++)
+                __xen_register_percpu_irq(smp_processor_id(),
+                                          saved_percpu_irqs[i].irq,
+                                          saved_percpu_irqs[i].action, 0);
+}
+
+/* FIXME: There's no obvious point to check whether slab is ready. So
+ * a hack is used here by utilizing a late time hook.
+ */
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int __devinit
+unbind_evtchn_callback(struct notifier_block *nfb,
+                       unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (unsigned long)hcpu;
+
+        if (action == CPU_DEAD) {
+                /* Unregister evtchn.  */
+                if (per_cpu(cpep_irq, cpu) >= 0) {
+                        unbind_from_irqhandler(per_cpu(cpep_irq, cpu), NULL);
+                        per_cpu(cpep_irq, cpu) = -1;
+                }
+                if (per_cpu(cmcp_irq, cpu) >= 0) {
+                        unbind_from_irqhandler(per_cpu(cmcp_irq, cpu), NULL);
+                        per_cpu(cmcp_irq, cpu) = -1;
+                }
+                if (per_cpu(cmc_irq, cpu) >= 0) {
+                        unbind_from_irqhandler(per_cpu(cmc_irq, cpu), NULL);
+                        per_cpu(cmc_irq, cpu) = -1;
+                }
+                if (per_cpu(ipi_irq, cpu) >= 0) {
+                        unbind_from_irqhandler(per_cpu(ipi_irq, cpu), NULL);
+                        per_cpu(ipi_irq, cpu) = -1;
+                }
+                if (per_cpu(resched_irq, cpu) >= 0) {
+                        unbind_from_irqhandler(per_cpu(resched_irq, cpu),
+                                                NULL);
+                        per_cpu(resched_irq, cpu) = -1;
+                }
+                if (per_cpu(timer_irq, cpu) >= 0) {
+                        unbind_from_irqhandler(per_cpu(timer_irq, cpu), NULL);
+                        per_cpu(timer_irq, cpu) = -1;
+                }
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block unbind_evtchn_notifier = {
+        .notifier_call = unbind_evtchn_callback,
+        .priority = 0
+};
+#endif
+
+void xen_smp_intr_init_early(unsigned int cpu)
+{
+#ifdef CONFIG_SMP
+        unsigned int i;
+
+        for (i = 0; i < saved_irq_cnt; i++)
+                __xen_register_percpu_irq(cpu, saved_percpu_irqs[i].irq,
+                                          saved_percpu_irqs[i].action, 0);
+#endif
+}
+
+void xen_smp_intr_init(void)
+{
+#ifdef CONFIG_SMP
+        unsigned int cpu = smp_processor_id();
+        struct callback_register event = {
+                .type = CALLBACKTYPE_event,
+                .address = { .ip = (unsigned long)&xen_event_callback },
+        };
+
+        if (cpu == 0) {
+                /* Initialization was already done for boot cpu.  */
+#ifdef CONFIG_HOTPLUG_CPU
+                /* Register the notifier only once.  */
+                register_cpu_notifier(&unbind_evtchn_notifier);
+#endif
+                return;
+        }
+
+        /* This should be piggyback when setup vcpu guest context */
+        BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
+#endif /* CONFIG_SMP */
+}
+
+void __init
+xen_irq_init(void)
+{
+        struct callback_register event = {
+                .type = CALLBACKTYPE_event,
+                .address = { .ip = (unsigned long)&xen_event_callback },
+        };
+
+        xen_init_IRQ();
+        BUG_ON(HYPERVISOR_callback_op(CALLBACKOP_register, &event));
+        late_time_init = xen_bind_early_percpu_irq;
+}
+
+void
+xen_platform_send_ipi(int cpu, int vector, int delivery_mode, int redirect)
+{
+#ifdef CONFIG_SMP
+        /* TODO: we need to call vcpu_up here */
+        if (unlikely(vector == ap_wakeup_vector)) {
+                /* XXX
+                 * This should be in __cpu_up(cpu) in ia64 smpboot.c
+                 * like x86. But don't want to modify it,
+                 * keep it untouched.
+                 */
+                xen_smp_intr_init_early(cpu);
+
+                xen_send_ipi(cpu, vector);
+                /* vcpu_prepare_and_up(cpu); */
+                return;
+        }
+#endif
+
+        switch (vector) {
+        case IA64_IPI_VECTOR:
+                xen_send_IPI_one(cpu, XEN_IPI_VECTOR);
+                break;
+        case IA64_IPI_RESCHEDULE:
+                xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
+                break;
+        case IA64_CMCP_VECTOR:
+                xen_send_IPI_one(cpu, XEN_CMCP_VECTOR);
+                break;
+        case IA64_CPEP_VECTOR:
+                xen_send_IPI_one(cpu, XEN_CPEP_VECTOR);
+                break;
+        case IA64_TIMER_VECTOR: {
+                /* this is used only once by check_sal_cache_flush()
+                   at boot time */
+                static int used = 0;
+                if (!used) {
+                        xen_send_ipi(cpu, IA64_TIMER_VECTOR);
+                        used = 1;
+                        break;
+                }
+                /* fallthrough */
+        }
+        default:
+                printk(KERN_WARNING "Unsupported IPI type 0x%x\n",
+                       vector);
+                notify_remote_via_irq(0); /* defaults to 0 irq */
+                break;
+        }
+}
+
+static void __init
+xen_register_ipi(void)
+{
+#ifdef CONFIG_SMP
+        register_percpu_irq(IA64_IPI_VECTOR, &xen_ipi_irqaction);
+        register_percpu_irq(IA64_IPI_RESCHEDULE, &xen_resched_irqaction);
+        register_percpu_irq(IA64_IPI_LOCAL_TLB_FLUSH, &xen_tlb_irqaction);
+#endif
+}
+
+static void
+xen_resend_irq(unsigned int vector)
+{
+        (void)resend_irq_on_evtchn(vector);
+}
+
+const struct pv_irq_ops xen_irq_ops __initdata = {
+        .register_ipi = xen_register_ipi,
+
+        .assign_irq_vector = xen_assign_irq_vector,
+        .free_irq_vector = xen_free_irq_vector,
+        .register_percpu_irq = xen_register_percpu_irq,
+
+        .resend_irq = xen_resend_irq,
+};
diff --git a/arch/ia64/xen/irq_xen.h b/arch/ia64/xen/irq_xen.h
new file mode 100644
index 000000000000..26110f330c87
--- /dev/null
+++ b/arch/ia64/xen/irq_xen.h
@@ -0,0 +1,34 @@
+/******************************************************************************
+ * arch/ia64/xen/irq_xen.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef IRQ_XEN_H
+#define IRQ_XEN_H
+
+extern void (*late_time_init)(void);
+extern char xen_event_callback;
+void __init xen_init_IRQ(void);
+
+extern const struct pv_irq_ops xen_irq_ops __initdata;
+extern void xen_smp_intr_init(void);
+extern void xen_send_ipi(int cpu, int vec);
+
+#endif /* IRQ_XEN_H */
diff --git a/arch/ia64/xen/machvec.c b/arch/ia64/xen/machvec.c
new file mode 100644
index 000000000000..4ad588a7c279
--- /dev/null
+++ b/arch/ia64/xen/machvec.c
@@ -0,0 +1,4 @@
+#define MACHVEC_PLATFORM_NAME           xen
+#define MACHVEC_PLATFORM_HEADER         <asm/machvec_xen.h>
+#include <asm/machvec_init.h>
+
diff --git a/arch/ia64/xen/suspend.c b/arch/ia64/xen/suspend.c
new file mode 100644
index 000000000000..fd66b048c6fa
--- /dev/null
+++ b/arch/ia64/xen/suspend.c
@@ -0,0 +1,64 @@
+/******************************************************************************
+ * arch/ia64/xen/suspend.c
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * suspend/resume
+ */
+
+#include <xen/xen-ops.h>
+#include <asm/xen/hypervisor.h>
+#include "time.h"
+
+void
+xen_mm_pin_all(void)
+{
+        /* nothing */
+}
+
+void
+xen_mm_unpin_all(void)
+{
+        /* nothing */
+}
+
+void xen_pre_device_suspend(void)
+{
+        /* nothing */
+}
+
+void
+xen_pre_suspend()
+{
+        /* nothing */
+}
+
+void
+xen_post_suspend(int suspend_cancelled)
+{
+        if (suspend_cancelled)
+                return;
+
+        xen_ia64_enable_opt_feature();
+        /* add more if necessary */
+}
+
+void xen_arch_resume(void)
+{
+        xen_timer_resume_on_aps();
+}
diff --git a/arch/ia64/xen/time.c b/arch/ia64/xen/time.c
new file mode 100644
index 000000000000..d15a94c330fb
--- /dev/null
+++ b/arch/ia64/xen/time.c
@@ -0,0 +1,213 @@
+/******************************************************************************
+ * arch/ia64/xen/time.c
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/kernel_stat.h>
+#include <linux/posix-timers.h>
+#include <linux/irq.h>
+#include <linux/clocksource.h>
+
+#include <asm/timex.h>
+
+#include <asm/xen/hypervisor.h>
+
+#include <xen/interface/vcpu.h>
+
+#include "../kernel/fsyscall_gtod_data.h"
+
+DEFINE_PER_CPU(struct vcpu_runstate_info, runstate);
+DEFINE_PER_CPU(unsigned long, processed_stolen_time);
+DEFINE_PER_CPU(unsigned long, processed_blocked_time);
+
+/* taken from i386/kernel/time-xen.c */
+static void xen_init_missing_ticks_accounting(int cpu)
+{
+        struct vcpu_register_runstate_memory_area area;
+        struct vcpu_runstate_info *runstate = &per_cpu(runstate, cpu);
+        int rc;
+
+        memset(runstate, 0, sizeof(*runstate));
+
+        area.addr.v = runstate;
+        rc = HYPERVISOR_vcpu_op(VCPUOP_register_runstate_memory_area, cpu,
+                                &area);
+        WARN_ON(rc && rc != -ENOSYS);
+
+        per_cpu(processed_blocked_time, cpu) = runstate->time[RUNSTATE_blocked];
+        per_cpu(processed_stolen_time, cpu) = runstate->time[RUNSTATE_runnable]
+                                            + runstate->time[RUNSTATE_offline];
+}
+
+/*
+ * Runstate accounting
+ */
+/* stolen from arch/x86/xen/time.c */
+static void get_runstate_snapshot(struct vcpu_runstate_info *res)
+{
+        u64 state_time;
+        struct vcpu_runstate_info *state;
+
+        BUG_ON(preemptible());
+
+        state = &__get_cpu_var(runstate);
+
+        /*
+         * The runstate info is always updated by the hypervisor on
+         * the current CPU, so there's no need to use anything
+         * stronger than a compiler barrier when fetching it.
+         */
+        do {
+                state_time = state->state_entry_time;
+                rmb();
+                *res = *state;
+                rmb();
+        } while (state->state_entry_time != state_time);
+}
+
+#define NS_PER_TICK (1000000000LL/HZ)
+
+static unsigned long
+consider_steal_time(unsigned long new_itm)
+{
+        unsigned long stolen, blocked;
+        unsigned long delta_itm = 0, stolentick = 0;
+        int cpu = smp_processor_id();
+        struct vcpu_runstate_info runstate;
+        struct task_struct *p = current;
+
+        get_runstate_snapshot(&runstate);
+
+        /*
+         * Check for vcpu migration effect
+         * In this case, itc value is reversed.
+         * This causes huge stolen value.
+         * This function just checks and reject this effect.
+         */
+        if (!time_after_eq(runstate.time[RUNSTATE_blocked],
+                           per_cpu(processed_blocked_time, cpu)))
+                blocked = 0;
+
+        if (!time_after_eq(runstate.time[RUNSTATE_runnable] +
+                           runstate.time[RUNSTATE_offline],
+                           per_cpu(processed_stolen_time, cpu)))
+                stolen = 0;
+
+        if (!time_after(delta_itm + new_itm, ia64_get_itc()))
+                stolentick = ia64_get_itc() - new_itm;
+
+        do_div(stolentick, NS_PER_TICK);
+        stolentick++;
+
+        do_div(stolen, NS_PER_TICK);
+
+        if (stolen > stolentick)
+                stolen = stolentick;
+
+        stolentick -= stolen;
+        do_div(blocked, NS_PER_TICK);
+
+        if (blocked > stolentick)
+                blocked = stolentick;
+
+        if (stolen > 0 || blocked > 0) {
+                account_steal_time(NULL, jiffies_to_cputime(stolen));
+                account_steal_time(idle_task(cpu), jiffies_to_cputime(blocked));
+                run_local_timers();
+
+                if (rcu_pending(cpu))
+                        rcu_check_callbacks(cpu, user_mode(get_irq_regs()));
+
+                scheduler_tick();
+                run_posix_cpu_timers(p);
+                delta_itm += local_cpu_data->itm_delta * (stolen + blocked);
+
+                if (cpu == time_keeper_id) {
+                        write_seqlock(&xtime_lock);
+                        do_timer(stolen + blocked);
+                        local_cpu_data->itm_next = delta_itm + new_itm;
+                        write_sequnlock(&xtime_lock);
+                } else {
+                        local_cpu_data->itm_next = delta_itm + new_itm;
+                }
+                per_cpu(processed_stolen_time, cpu) += NS_PER_TICK * stolen;
+                per_cpu(processed_blocked_time, cpu) += NS_PER_TICK * blocked;
+        }
+        return delta_itm;
+}
+
+static int xen_do_steal_accounting(unsigned long *new_itm)
+{
+        unsigned long delta_itm;
+        delta_itm = consider_steal_time(*new_itm);
+        *new_itm += delta_itm;
+        if (time_after(*new_itm, ia64_get_itc()) && delta_itm)
+                return 1;
+
+        return 0;
+}
+
+static void xen_itc_jitter_data_reset(void)
+{
+        u64 lcycle, ret;
+
+        do {
+                lcycle = itc_jitter_data.itc_lastcycle;
+                ret = cmpxchg(&itc_jitter_data.itc_lastcycle, lcycle, 0);
+        } while (unlikely(ret != lcycle));
+}
+
+struct pv_time_ops xen_time_ops __initdata = {
+        .init_missing_ticks_accounting  = xen_init_missing_ticks_accounting,
+        .do_steal_accounting            = xen_do_steal_accounting,
+        .clocksource_resume             = xen_itc_jitter_data_reset,
+};
+
+/* Called after suspend, to resume time.  */
+static void xen_local_tick_resume(void)
+{
+        /* Just trigger a tick.  */
+        ia64_cpu_local_tick();
+        touch_softlockup_watchdog();
+}
+
+void
+xen_timer_resume(void)
+{
+        unsigned int cpu;
+
+        xen_local_tick_resume();
+
+        for_each_online_cpu(cpu)
+                xen_init_missing_ticks_accounting(cpu);
+}
+
+static void ia64_cpu_local_tick_fn(void *unused)
+{
+        xen_local_tick_resume();
+        xen_init_missing_ticks_accounting(smp_processor_id());
+}
+
+void
+xen_timer_resume_on_aps(void)
+{
+        smp_call_function(&ia64_cpu_local_tick_fn, NULL, 1);
+}
diff --git a/arch/ia64/xen/time.h b/arch/ia64/xen/time.h
new file mode 100644
index 000000000000..f98d7e1a42f0
--- /dev/null
+++ b/arch/ia64/xen/time.h
@@ -0,0 +1,24 @@
+/******************************************************************************
+ * arch/ia64/xen/time.h
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+extern struct pv_time_ops xen_time_ops __initdata;
+void xen_timer_resume_on_aps(void);
diff --git a/arch/ia64/xen/xcom_hcall.c b/arch/ia64/xen/xcom_hcall.c
new file mode 100644
index 000000000000..ccaf7431f7c8
--- /dev/null
+++ b/arch/ia64/xen/xcom_hcall.c
@@ -0,0 +1,441 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ *          Tristan Gingold <tristan.gingold@bull.net>
+ *
+ *          Copyright (c) 2007
+ *          Isaku Yamahata <yamahata at valinux co jp>
+ *                          VA Linux Systems Japan K.K.
+ *          consolidate mini and inline version.
+ */
+
+#include <linux/module.h>
+#include <xen/interface/xen.h>
+#include <xen/interface/memory.h>
+#include <xen/interface/grant_table.h>
+#include <xen/interface/callback.h>
+#include <xen/interface/vcpu.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/xencomm.h>
+
+/* Xencomm notes:
+ * This file defines hypercalls to be used by xencomm.  The hypercalls simply
+ * create inlines or mini descriptors for pointers and then call the raw arch
+ * hypercall xencomm_arch_hypercall_XXX
+ *
+ * If the arch wants to directly use these hypercalls, simply define macros
+ * in asm/xen/hypercall.h, eg:
+ *  #define HYPERVISOR_sched_op xencomm_hypercall_sched_op
+ *
+ * The arch may also define HYPERVISOR_xxx as a function and do more operations
+ * before/after doing the hypercall.
+ *
+ * Note: because only inline or mini descriptors are created these functions
+ * must only be called with in kernel memory parameters.
+ */
+
+int
+xencomm_hypercall_console_io(int cmd, int count, char *str)
+{
+        /* xen early printk uses console io hypercall before
+         * xencomm initialization. In that case, we just ignore it.
+         */
+        if (!xencomm_is_initialized())
+                return 0;
+
+        return xencomm_arch_hypercall_console_io
+                (cmd, count, xencomm_map_no_alloc(str, count));
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_console_io);
+
+int
+xencomm_hypercall_event_channel_op(int cmd, void *op)
+{
+        struct xencomm_handle *desc;
+        desc = xencomm_map_no_alloc(op, sizeof(struct evtchn_op));
+        if (desc == NULL)
+                return -EINVAL;
+
+        return xencomm_arch_hypercall_event_channel_op(cmd, desc);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_event_channel_op);
+
+int
+xencomm_hypercall_xen_version(int cmd, void *arg)
+{
+        struct xencomm_handle *desc;
+        unsigned int argsize;
+
+        switch (cmd) {
+        case XENVER_version:
+                /* do not actually pass an argument */
+                return xencomm_arch_hypercall_xen_version(cmd, 0);
+        case XENVER_extraversion:
+                argsize = sizeof(struct xen_extraversion);
+                break;
+        case XENVER_compile_info:
+                argsize = sizeof(struct xen_compile_info);
+                break;
+        case XENVER_capabilities:
+                argsize = sizeof(struct xen_capabilities_info);
+                break;
+        case XENVER_changeset:
+                argsize = sizeof(struct xen_changeset_info);
+                break;
+        case XENVER_platform_parameters:
+                argsize = sizeof(struct xen_platform_parameters);
+                break;
+        case XENVER_get_features:
+                argsize = (arg == NULL) ? 0 : sizeof(struct xen_feature_info);
+                break;
+
+        default:
+                printk(KERN_DEBUG
+                       "%s: unknown version op %d\n", __func__, cmd);
+                return -ENOSYS;
+        }
+
+        desc = xencomm_map_no_alloc(arg, argsize);
+        if (desc == NULL)
+                return -EINVAL;
+
+        return xencomm_arch_hypercall_xen_version(cmd, desc);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_xen_version);
+
+int
+xencomm_hypercall_physdev_op(int cmd, void *op)
+{
+        unsigned int argsize;
+
+        switch (cmd) {
+        case PHYSDEVOP_apic_read:
+        case PHYSDEVOP_apic_write:
+                argsize = sizeof(struct physdev_apic);
+                break;
+        case PHYSDEVOP_alloc_irq_vector:
+        case PHYSDEVOP_free_irq_vector:
+                argsize = sizeof(struct physdev_irq);
+                break;
+        case PHYSDEVOP_irq_status_query:
+                argsize = sizeof(struct physdev_irq_status_query);
+                break;
+
+        default:
+                printk(KERN_DEBUG
+                       "%s: unknown physdev op %d\n", __func__, cmd);
+                return -ENOSYS;
+        }
+
+        return xencomm_arch_hypercall_physdev_op
+                (cmd, xencomm_map_no_alloc(op, argsize));
+}
+
+static int
+xencommize_grant_table_op(struct xencomm_mini **xc_area,
+                          unsigned int cmd, void *op, unsigned int count,
+                          struct xencomm_handle **desc)
+{
+        struct xencomm_handle *desc1;
+        unsigned int argsize;
+
+        switch (cmd) {
+        case GNTTABOP_map_grant_ref:
+                argsize = sizeof(struct gnttab_map_grant_ref);
+                break;
+        case GNTTABOP_unmap_grant_ref:
+                argsize = sizeof(struct gnttab_unmap_grant_ref);
+                break;
+        case GNTTABOP_setup_table:
+        {
+                struct gnttab_setup_table *setup = op;
+
+                argsize = sizeof(*setup);
+
+                if (count != 1)
+                        return -EINVAL;
+                desc1 = __xencomm_map_no_alloc
+                        (xen_guest_handle(setup->frame_list),
+                         setup->nr_frames *
+                         sizeof(*xen_guest_handle(setup->frame_list)),
+                         *xc_area);
+                if (desc1 == NULL)
+                        return -EINVAL;
+                (*xc_area)++;
+                set_xen_guest_handle(setup->frame_list, (void *)desc1);
+                break;
+        }
+        case GNTTABOP_dump_table:
+                argsize = sizeof(struct gnttab_dump_table);
+                break;
+        case GNTTABOP_transfer:
+                argsize = sizeof(struct gnttab_transfer);
+                break;
+        case GNTTABOP_copy:
+                argsize = sizeof(struct gnttab_copy);
+                break;
+        case GNTTABOP_query_size:
+                argsize = sizeof(struct gnttab_query_size);
+                break;
+        default:
+                printk(KERN_DEBUG "%s: unknown hypercall grant table op %d\n",
+                       __func__, cmd);
+                BUG();
+        }
+
+        *desc = __xencomm_map_no_alloc(op, count * argsize, *xc_area);
+        if (*desc == NULL)
+                return -EINVAL;
+        (*xc_area)++;
+
+        return 0;
+}
+
+int
+xencomm_hypercall_grant_table_op(unsigned int cmd, void *op,
+                                 unsigned int count)
+{
+        int rc;
+        struct xencomm_handle *desc;
+        XENCOMM_MINI_ALIGNED(xc_area, 2);
+
+        rc = xencommize_grant_table_op(&xc_area, cmd, op, count, &desc);
+        if (rc)
+                return rc;
+
+        return xencomm_arch_hypercall_grant_table_op(cmd, desc, count);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_grant_table_op);
+
+int
+xencomm_hypercall_sched_op(int cmd, void *arg)
+{
+        struct xencomm_handle *desc;
+        unsigned int argsize;
+
+        switch (cmd) {
+        case SCHEDOP_yield:
+        case SCHEDOP_block:
+                argsize = 0;
+                break;
+        case SCHEDOP_shutdown:
+                argsize = sizeof(struct sched_shutdown);
+                break;
+        case SCHEDOP_poll:
+        {
+                struct sched_poll *poll = arg;
+                struct xencomm_handle *ports;
+
+                argsize = sizeof(struct sched_poll);
+                ports = xencomm_map_no_alloc(xen_guest_handle(poll->ports),
+                                     sizeof(*xen_guest_handle(poll->ports)));
+
+                set_xen_guest_handle(poll->ports, (void *)ports);
+                break;
+        }
+        default:
+                printk(KERN_DEBUG "%s: unknown sched op %d\n", __func__, cmd);
+                return -ENOSYS;
+        }
+
+        desc = xencomm_map_no_alloc(arg, argsize);
+        if (desc == NULL)
+                return -EINVAL;
+
+        return xencomm_arch_hypercall_sched_op(cmd, desc);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_sched_op);
+
+int
+xencomm_hypercall_multicall(void *call_list, int nr_calls)
+{
+        int rc;
+        int i;
+        struct multicall_entry *mce;
+        struct xencomm_handle *desc;
+        XENCOMM_MINI_ALIGNED(xc_area, nr_calls * 2);
+
+        for (i = 0; i < nr_calls; i++) {
+                mce = (struct multicall_entry *)call_list + i;
+
+                switch (mce->op) {
+                case __HYPERVISOR_update_va_mapping:
+                case __HYPERVISOR_mmu_update:
+                        /* No-op on ia64.  */
+                        break;
+                case __HYPERVISOR_grant_table_op:
+                        rc = xencommize_grant_table_op
+                                (&xc_area,
+                                 mce->args[0], (void *)mce->args[1],
+                                 mce->args[2], &desc);
+                        if (rc)
+                                return rc;
+                        mce->args[1] = (unsigned long)desc;
+                        break;
+                case __HYPERVISOR_memory_op:
+                default:
+                        printk(KERN_DEBUG
+                               "%s: unhandled multicall op entry op %lu\n",
+                               __func__, mce->op);
+                        return -ENOSYS;
+                }
+        }
+
+        desc = xencomm_map_no_alloc(call_list,
+                                    nr_calls * sizeof(struct multicall_entry));
+        if (desc == NULL)
+                return -EINVAL;
+
+        return xencomm_arch_hypercall_multicall(desc, nr_calls);
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_multicall);
+
+int
+xencomm_hypercall_callback_op(int cmd, void *arg)
+{
+        unsigned int argsize;
+        switch (cmd) {
+        case CALLBACKOP_register:
+                argsize = sizeof(struct callback_register);
+                break;
+        case CALLBACKOP_unregister:
+                argsize = sizeof(struct callback_unregister);
+                break;
+        default:
+                printk(KERN_DEBUG
+                       "%s: unknown callback op %d\n", __func__, cmd);
+                return -ENOSYS;
+        }
+
+        return xencomm_arch_hypercall_callback_op
+                (cmd, xencomm_map_no_alloc(arg, argsize));
+}
+
+static int
+xencommize_memory_reservation(struct xencomm_mini *xc_area,
+                              struct xen_memory_reservation *mop)
+{
+        struct xencomm_handle *desc;
+
+        desc = __xencomm_map_no_alloc(xen_guest_handle(mop->extent_start),
+                        mop->nr_extents *
+                        sizeof(*xen_guest_handle(mop->extent_start)),
+                        xc_area);
+        if (desc == NULL)
+                return -EINVAL;
+
+        set_xen_guest_handle(mop->extent_start, (void *)desc);
+        return 0;
+}
+
+int
+xencomm_hypercall_memory_op(unsigned int cmd, void *arg)
+{
+        GUEST_HANDLE(xen_pfn_t) extent_start_va[2] = { {NULL}, {NULL} };
+        struct xen_memory_reservation *xmr = NULL;
+        int rc;
+        struct xencomm_handle *desc;
+        unsigned int argsize;
+        XENCOMM_MINI_ALIGNED(xc_area, 2);
+
+        switch (cmd) {
+        case XENMEM_increase_reservation:
+        case XENMEM_decrease_reservation:
+        case XENMEM_populate_physmap:
+                xmr = (struct xen_memory_reservation *)arg;
+                set_xen_guest_handle(extent_start_va[0],
+                                     xen_guest_handle(xmr->extent_start));
+
+                argsize = sizeof(*xmr);
+                rc = xencommize_memory_reservation(xc_area, xmr);
+                if (rc)
+                        return rc;
+                xc_area++;
+                break;
+
+        case XENMEM_maximum_ram_page:
+                argsize = 0;
+                break;
+
+        case XENMEM_add_to_physmap:
+                argsize = sizeof(struct xen_add_to_physmap);
+                break;
+
+        default:
+                printk(KERN_DEBUG "%s: unknown memory op %d\n", __func__, cmd);
+                return -ENOSYS;
+        }
+
+        desc = xencomm_map_no_alloc(arg, argsize);
+        if (desc == NULL)
+                return -EINVAL;
+
+        rc = xencomm_arch_hypercall_memory_op(cmd, desc);
+
+        switch (cmd) {
+        case XENMEM_increase_reservation:
+        case XENMEM_decrease_reservation:
+        case XENMEM_populate_physmap:
+                set_xen_guest_handle(xmr->extent_start,
+                                     xen_guest_handle(extent_start_va[0]));
+                break;
+        }
+
+        return rc;
+}
+EXPORT_SYMBOL_GPL(xencomm_hypercall_memory_op);
+
+int
+xencomm_hypercall_suspend(unsigned long srec)
+{
+        struct sched_shutdown arg;
+
+        arg.reason = SHUTDOWN_suspend;
+
+        return xencomm_arch_hypercall_sched_op(
+                SCHEDOP_shutdown, xencomm_map_no_alloc(&arg, sizeof(arg)));
+}
+
+long
+xencomm_hypercall_vcpu_op(int cmd, int cpu, void *arg)
+{
+        unsigned int argsize;
+        switch (cmd) {
+        case VCPUOP_register_runstate_memory_area: {
+                struct vcpu_register_runstate_memory_area *area =
+                        (struct vcpu_register_runstate_memory_area *)arg;
+                argsize = sizeof(*arg);
+                set_xen_guest_handle(area->addr.h,
+                     (void *)xencomm_map_no_alloc(area->addr.v,
+                                                  sizeof(area->addr.v)));
+                break;
+        }
+
+        default:
+                printk(KERN_DEBUG "%s: unknown vcpu op %d\n", __func__, cmd);
+                return -ENOSYS;
+        }
+
+        return xencomm_arch_hypercall_vcpu_op(cmd, cpu,
+                                        xencomm_map_no_alloc(arg, argsize));
+}
+
+long
+xencomm_hypercall_opt_feature(void *arg)
+{
+        return xencomm_arch_hypercall_opt_feature(
+                xencomm_map_no_alloc(arg,
+                                     sizeof(struct xen_ia64_opt_feature)));
+}
diff --git a/arch/ia64/xen/xen_pv_ops.c b/arch/ia64/xen/xen_pv_ops.c
new file mode 100644
index 000000000000..04cd12350455
--- /dev/null
+++ b/arch/ia64/xen/xen_pv_ops.c
@@ -0,0 +1,364 @@
+/******************************************************************************
+ * arch/ia64/xen/xen_pv_ops.c
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/console.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/pm.h>
+
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/xencomm.h>
+#include <asm/xen/privop.h>
+
+#include "irq_xen.h"
+#include "time.h"
+
+/***************************************************************************
+ * general info
+ */
+static struct pv_info xen_info __initdata = {
+        .kernel_rpl = 2,        /* or 1: determin at runtime */
+        .paravirt_enabled = 1,
+        .name = "Xen/ia64",
+};
+
+#define IA64_RSC_PL_SHIFT       2
+#define IA64_RSC_PL_BIT_SIZE    2
+#define IA64_RSC_PL_MASK        \
+        (((1UL << IA64_RSC_PL_BIT_SIZE) - 1) << IA64_RSC_PL_SHIFT)
+
+static void __init
+xen_info_init(void)
+{
+        /* Xenified Linux/ia64 may run on pl = 1 or 2.
+         * determin at run time. */
+        unsigned long rsc = ia64_getreg(_IA64_REG_AR_RSC);
+        unsigned int rpl = (rsc & IA64_RSC_PL_MASK) >> IA64_RSC_PL_SHIFT;
+        xen_info.kernel_rpl = rpl;
+}
+
+/***************************************************************************
+ * pv_init_ops
+ * initialization hooks.
+ */
+
+static void
+xen_panic_hypercall(struct unw_frame_info *info, void *arg)
+{
+        current->thread.ksp = (__u64)info->sw - 16;
+        HYPERVISOR_shutdown(SHUTDOWN_crash);
+        /* we're never actually going to get here... */
+}
+
+static int
+xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+        unw_init_running(xen_panic_hypercall, NULL);
+        /* we're never actually going to get here... */
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block xen_panic_block = {
+        xen_panic_event, NULL, 0 /* try to go last */
+};
+
+static void xen_pm_power_off(void)
+{
+        local_irq_disable();
+        HYPERVISOR_shutdown(SHUTDOWN_poweroff);
+}
+
+static void __init
+xen_banner(void)
+{
+        printk(KERN_INFO
+               "Running on Xen! pl = %d start_info_pfn=0x%lx nr_pages=%ld "
+               "flags=0x%x\n",
+               xen_info.kernel_rpl,
+               HYPERVISOR_shared_info->arch.start_info_pfn,
+               xen_start_info->nr_pages, xen_start_info->flags);
+}
+
+static int __init
+xen_reserve_memory(struct rsvd_region *region)
+{
+        region->start = (unsigned long)__va(
+                (HYPERVISOR_shared_info->arch.start_info_pfn << PAGE_SHIFT));
+        region->end   = region->start + PAGE_SIZE;
+        return 1;
+}
+
+static void __init
+xen_arch_setup_early(void)
+{
+        struct shared_info *s;
+        BUG_ON(!xen_pv_domain());
+
+        s = HYPERVISOR_shared_info;
+        xen_start_info = __va(s->arch.start_info_pfn << PAGE_SHIFT);
+
+        /* Must be done before any hypercall.  */
+        xencomm_initialize();
+
+        xen_setup_features();
+        /* Register a call for panic conditions. */
+        atomic_notifier_chain_register(&panic_notifier_list,
+                                       &xen_panic_block);
+        pm_power_off = xen_pm_power_off;
+
+        xen_ia64_enable_opt_feature();
+}
+
+static void __init
+xen_arch_setup_console(char **cmdline_p)
+{
+        add_preferred_console("xenboot", 0, NULL);
+        add_preferred_console("tty", 0, NULL);
+        /* use hvc_xen */
+        add_preferred_console("hvc", 0, NULL);
+
+#if !defined(CONFIG_VT) || !defined(CONFIG_DUMMY_CONSOLE)
+        conswitchp = NULL;
+#endif
+}
+
+static int __init
+xen_arch_setup_nomca(void)
+{
+        return 1;
+}
+
+static void __init
+xen_post_smp_prepare_boot_cpu(void)
+{
+        xen_setup_vcpu_info_placement();
+}
+
+static const struct pv_init_ops xen_init_ops __initdata = {
+        .banner = xen_banner,
+
+        .reserve_memory = xen_reserve_memory,
+
+        .arch_setup_early = xen_arch_setup_early,
+        .arch_setup_console = xen_arch_setup_console,
+        .arch_setup_nomca = xen_arch_setup_nomca,
+
+        .post_smp_prepare_boot_cpu = xen_post_smp_prepare_boot_cpu,
+};
+
+/***************************************************************************
+ * pv_cpu_ops
+ * intrinsics hooks.
+ */
+
+static void xen_setreg(int regnum, unsigned long val)
+{
+        switch (regnum) {
+        case _IA64_REG_AR_KR0 ... _IA64_REG_AR_KR7:
+                xen_set_kr(regnum - _IA64_REG_AR_KR0, val);
+                break;
+#ifdef CONFIG_IA32_SUPPORT
+        case _IA64_REG_AR_EFLAG:
+                xen_set_eflag(val);
+                break;
+#endif
+        case _IA64_REG_CR_TPR:
+                xen_set_tpr(val);
+                break;
+        case _IA64_REG_CR_ITM:
+                xen_set_itm(val);
+                break;
+        case _IA64_REG_CR_EOI:
+                xen_eoi(val);
+                break;
+        default:
+                ia64_native_setreg_func(regnum, val);
+                break;
+        }
+}
+
+static unsigned long xen_getreg(int regnum)
+{
+        unsigned long res;
+
+        switch (regnum) {
+        case _IA64_REG_PSR:
+                res = xen_get_psr();
+                break;
+#ifdef CONFIG_IA32_SUPPORT
+        case _IA64_REG_AR_EFLAG:
+                res = xen_get_eflag();
+                break;
+#endif
+        case _IA64_REG_CR_IVR:
+                res = xen_get_ivr();
+                break;
+        case _IA64_REG_CR_TPR:
+                res = xen_get_tpr();
+                break;
+        default:
+                res = ia64_native_getreg_func(regnum);
+                break;
+        }
+        return res;
+}
+
+/* turning on interrupts is a bit more complicated.. write to the
+ * memory-mapped virtual psr.i bit first (to avoid race condition),
+ * then if any interrupts were pending, we have to execute a hyperprivop
+ * to ensure the pending interrupt gets delivered; else we're done! */
+static void
+xen_ssm_i(void)
+{
+        int old = xen_get_virtual_psr_i();
+        xen_set_virtual_psr_i(1);
+        barrier();
+        if (!old && xen_get_virtual_pend())
+                xen_hyper_ssm_i();
+}
+
+/* turning off interrupts can be paravirtualized simply by writing
+ * to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
+static void
+xen_rsm_i(void)
+{
+        xen_set_virtual_psr_i(0);
+        barrier();
+}
+
+static unsigned long
+xen_get_psr_i(void)
+{
+        return xen_get_virtual_psr_i() ? IA64_PSR_I : 0;
+}
+
+static void
+xen_intrin_local_irq_restore(unsigned long mask)
+{
+        if (mask & IA64_PSR_I)
+                xen_ssm_i();
+        else
+                xen_rsm_i();
+}
+
+static const struct pv_cpu_ops xen_cpu_ops __initdata = {
+        .fc             = xen_fc,
+        .thash          = xen_thash,
+        .get_cpuid      = xen_get_cpuid,
+        .get_pmd        = xen_get_pmd,
+        .getreg         = xen_getreg,
+        .setreg         = xen_setreg,
+        .ptcga          = xen_ptcga,
+        .get_rr         = xen_get_rr,
+        .set_rr         = xen_set_rr,
+        .set_rr0_to_rr4 = xen_set_rr0_to_rr4,
+        .ssm_i          = xen_ssm_i,
+        .rsm_i          = xen_rsm_i,
+        .get_psr_i      = xen_get_psr_i,
+        .intrin_local_irq_restore
+                        = xen_intrin_local_irq_restore,
+};
+
+/******************************************************************************
+ * replacement of hand written assembly codes.
+ */
+
+extern char xen_switch_to;
+extern char xen_leave_syscall;
+extern char xen_work_processed_syscall;
+extern char xen_leave_kernel;
+
+const struct pv_cpu_asm_switch xen_cpu_asm_switch = {
+        .switch_to              = (unsigned long)&xen_switch_to,
+        .leave_syscall          = (unsigned long)&xen_leave_syscall,
+        .work_processed_syscall = (unsigned long)&xen_work_processed_syscall,
+        .leave_kernel           = (unsigned long)&xen_leave_kernel,
+};
+
+/***************************************************************************
+ * pv_iosapic_ops
+ * iosapic read/write hooks.
+ */
+static void
+xen_pcat_compat_init(void)
+{
+        /* nothing */
+}
+
+static struct irq_chip*
+xen_iosapic_get_irq_chip(unsigned long trigger)
+{
+        return NULL;
+}
+
+static unsigned int
+xen_iosapic_read(char __iomem *iosapic, unsigned int reg)
+{
+        struct physdev_apic apic_op;
+        int ret;
+
+        apic_op.apic_physbase = (unsigned long)iosapic -
+                                        __IA64_UNCACHED_OFFSET;
+        apic_op.reg = reg;
+        ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
+        if (ret)
+                return ret;
+        return apic_op.value;
+}
+
+static void
+xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
+{
+        struct physdev_apic apic_op;
+
+        apic_op.apic_physbase = (unsigned long)iosapic -
+                                        __IA64_UNCACHED_OFFSET;
+        apic_op.reg = reg;
+        apic_op.value = val;
+        HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
+}
+
+static const struct pv_iosapic_ops xen_iosapic_ops __initdata = {
+        .pcat_compat_init = xen_pcat_compat_init,
+        .__get_irq_chip = xen_iosapic_get_irq_chip,
+
+        .__read = xen_iosapic_read,
+        .__write = xen_iosapic_write,
+};
+
+/***************************************************************************
+ * pv_ops initialization
+ */
+
+void __init
+xen_setup_pv_ops(void)
+{
+        xen_info_init();
+        pv_info = xen_info;
+        pv_init_ops = xen_init_ops;
+        pv_cpu_ops = xen_cpu_ops;
+        pv_iosapic_ops = xen_iosapic_ops;
+        pv_irq_ops = xen_irq_ops;
+        pv_time_ops = xen_time_ops;
+
+        paravirt_cpu_asm_init(&xen_cpu_asm_switch);
+}
diff --git a/arch/ia64/xen/xencomm.c b/arch/ia64/xen/xencomm.c
new file mode 100644
index 000000000000..1f5d7ac82e97
--- /dev/null
+++ b/arch/ia64/xen/xencomm.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2006 Hollis Blanchard <hollisb@us.ibm.com>, IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/mm.h>
+
+static unsigned long kernel_virtual_offset;
+static int is_xencomm_initialized;
+
+/* for xen early printk. It uses console io hypercall which uses xencomm.
+ * However early printk may use it before xencomm initialization.
+ */
+int
+xencomm_is_initialized(void)
+{
+        return is_xencomm_initialized;
+}
+
+void
+xencomm_initialize(void)
+{
+        kernel_virtual_offset = KERNEL_START - ia64_tpa(KERNEL_START);
+        is_xencomm_initialized = 1;
+}
+
+/* Translate virtual address to physical address.  */
+unsigned long
+xencomm_vtop(unsigned long vaddr)
+{
+        struct page *page;
+        struct vm_area_struct *vma;
+
+        if (vaddr == 0)
+                return 0UL;
+
+        if (REGION_NUMBER(vaddr) == 5) {
+                pgd_t *pgd;
+                pud_t *pud;
+                pmd_t *pmd;
+                pte_t *ptep;
+
+                /* On ia64, TASK_SIZE refers to current.  It is not initialized
+                   during boot.
+                   Furthermore the kernel is relocatable and __pa() doesn't
+                   work on  addresses.  */
+                if (vaddr >= KERNEL_START
+                    && vaddr < (KERNEL_START + KERNEL_TR_PAGE_SIZE))
+                        return vaddr - kernel_virtual_offset;
+
+                /* In kernel area -- virtually mapped.  */
+                pgd = pgd_offset_k(vaddr);
+                if (pgd_none(*pgd) || pgd_bad(*pgd))
+                        return ~0UL;
+
+                pud = pud_offset(pgd, vaddr);
+                if (pud_none(*pud) || pud_bad(*pud))
+                        return ~0UL;
+
+                pmd = pmd_offset(pud, vaddr);
+                if (pmd_none(*pmd) || pmd_bad(*pmd))
+                        return ~0UL;
+
+                ptep = pte_offset_kernel(pmd, vaddr);
+                if (!ptep)
+                        return ~0UL;
+
+                return (pte_val(*ptep) & _PFN_MASK) | (vaddr & ~PAGE_MASK);
+        }
+
+        if (vaddr > TASK_SIZE) {
+                /* percpu variables */
+                if (REGION_NUMBER(vaddr) == 7 &&
+                    REGION_OFFSET(vaddr) >= (1ULL << IA64_MAX_PHYS_BITS))
+                        ia64_tpa(vaddr);
+
+                /* kernel address */
+                return __pa(vaddr);
+        }
+
+        /* XXX double-check (lack of) locking */
+        vma = find_extend_vma(current->mm, vaddr);
+        if (!vma)
+                return ~0UL;
+
+        /* We assume the page is modified.  */
+        page = follow_page(vma, vaddr, FOLL_WRITE | FOLL_TOUCH);
+        if (!page)
+                return ~0UL;
+
+        return (page_to_pfn(page) << PAGE_SHIFT) | (vaddr & ~PAGE_MASK);
+}
diff --git a/arch/ia64/xen/xenivt.S b/arch/ia64/xen/xenivt.S
new file mode 100644
index 000000000000..3e71d50584d9
--- /dev/null
+++ b/arch/ia64/xen/xenivt.S
@@ -0,0 +1,52 @@
+/*
+ * arch/ia64/xen/ivt.S
+ *
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *      Dan Magenheimer <dan.magenheimer@hp.com>
+ *
+ * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *                    pv_ops.
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/kregs.h>
+#include <asm/pgtable.h>
+
+#include "../kernel/minstate.h"
+
+        .section .text,"ax"
+GLOBAL_ENTRY(xen_event_callback)
+        mov r31=pr              // prepare to save predicates
+        ;;
+        SAVE_MIN_WITH_COVER     // uses r31; defines r2 and r3
+        ;;
+        movl r3=XSI_PSR_IC
+        mov r14=1
+        ;;
+        st4 [r3]=r14
+        ;;
+        adds r3=8,r2            // set up second base pointer for SAVE_REST
+        srlz.i                  // ensure everybody knows psr.ic is back on
+        ;;
+        SAVE_REST
+        ;;
+1:
+        alloc r14=ar.pfs,0,0,1,0 // must be first in an insn group
+        add out0=16,sp          // pass pointer to pt_regs as first arg
+        ;;
+        br.call.sptk.many b0=xen_evtchn_do_upcall
+        ;;
+        movl r20=XSI_PSR_I_ADDR
+        ;;
+        ld8 r20=[r20]
+        ;;
+        adds r20=-1,r20         // vcpu_info->evtchn_upcall_pending
+        ;;
+        ld1 r20=[r20]
+        ;;
+        cmp.ne p6,p0=r20,r0     // if there are pending events,
+        (p6) br.spnt.few 1b     // call evtchn_do_upcall again.
+        br.sptk.many xen_leave_kernel   // we know ia64_leave_kernel is
+                                        // paravirtualized as xen_leave_kernel
+END(xen_event_callback)
diff --git a/arch/ia64/xen/xensetup.S b/arch/ia64/xen/xensetup.S
new file mode 100644
index 000000000000..28fed1fcc079
--- /dev/null
+++ b/arch/ia64/xen/xensetup.S
@@ -0,0 +1,83 @@
+/*
+ * Support routines for Xen
+ *
+ * Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@hp.com>
+ */
+
+#include <asm/processor.h>
+#include <asm/asmmacro.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/paravirt.h>
+#include <asm/xen/privop.h>
+#include <linux/elfnote.h>
+#include <linux/init.h>
+#include <xen/interface/elfnote.h>
+
+        .section .data.read_mostly
+        .align 8
+        .global xen_domain_type
+xen_domain_type:
+        data4 XEN_NATIVE_ASM
+        .previous
+
+        __INIT
+ENTRY(startup_xen)
+        // Calculate load offset.
+        // The constant, LOAD_OFFSET, can't be used because the boot
+        // loader doesn't always load to the LMA specified by the vmlinux.lds.
+        mov r9=ip       // must be the first instruction to make sure
+                        // that r9 = the physical address of startup_xen.
+                        // Usually r9 = startup_xen - LOAD_OFFSET
+        movl r8=startup_xen
+        ;;
+        sub r9=r9,r8    // Usually r9 = -LOAD_OFFSET.
+
+        mov r10=PARAVIRT_HYPERVISOR_TYPE_XEN
+        movl r11=_start
+        ;;
+        add r11=r11,r9
+        movl r8=hypervisor_type
+        ;;
+        add r8=r8,r9
+        mov b0=r11
+        ;;
+        st8 [r8]=r10
+        br.cond.sptk.many b0
+        ;;
+END(startup_xen)
+
+        ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS,      .asciz "linux")
+        ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
+        ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION,   .asciz "xen-3.0")
+        ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,         data8.ua startup_xen - LOAD_OFFSET)
+
+#define isBP    p3      // are we the Bootstrap Processor?
+
+        .text
+
+GLOBAL_ENTRY(xen_setup_hook)
+        mov r8=XEN_PV_DOMAIN_ASM
+(isBP)  movl r9=xen_domain_type;;
+(isBP)  st4 [r9]=r8
+        movl r10=xen_ivt;;
+
+        mov cr.iva=r10
+
+        /* Set xsi base.  */
+#define FW_HYPERCALL_SET_SHARED_INFO_VA                 0x600
+(isBP)  mov r2=FW_HYPERCALL_SET_SHARED_INFO_VA
+(isBP)  movl r28=XSI_BASE;;
+(isBP)  break 0x1000;;
+
+        /* setup pv_ops */
+(isBP)  mov r4=rp
+        ;;
+(isBP)  br.call.sptk.many rp=xen_setup_pv_ops
+        ;;
+(isBP)  mov rp=r4
+        ;;
+
+        br.ret.sptk.many rp
+        ;;
+END(xen_setup_hook)