Merge commit 'v2.6.36-rc3' into x86/memblock

Conflicts:
	arch/x86/kernel/trampoline.c
	mm/memblock.c

Merge reason: Resolve the conflicts, update to latest upstream.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

12 files changed, 863 insertions, 71 deletions

diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index b83e119fbeb0..68128a1b401a 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -13,6 +13,11 @@ config XEN
           kernel to boot in a paravirtualized environment under the
           Xen hypervisor.
 
+config XEN_PVHVM
+        def_bool y
+        depends on XEN
+        depends on X86_LOCAL_APIC
+
 config XEN_MAX_DOMAIN_MEMORY
        int "Maximum allowed size of a domain in gigabytes"
        default 8 if X86_32
diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
index 3bb4fc21f4f2..779385158915 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -12,9 +12,10 @@ CFLAGS_mmu.o			:= $(nostackp)
 
 obj-y           := enlighten.o setup.o multicalls.o mmu.o irq.o \
                         time.o xen-asm.o xen-asm_$(BITS).o \
-                        grant-table.o suspend.o
+                        grant-table.o suspend.o platform-pci-unplug.o
 
 obj-$(CONFIG_SMP)               += smp.o
 obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
 obj-$(CONFIG_XEN_DEBUG_FS)      += debugfs.o
 
+obj-$(CONFIG_SWIOTLB_XEN)       += pci-swiotlb-xen.o
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 65d8d79b46a8..7d46c8441418 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -11,6 +11,7 @@
  * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
  */
 
+#include <linux/cpu.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/smp.h>
@@ -35,8 +36,10 @@
 #include <xen/interface/version.h>
 #include <xen/interface/physdev.h>
 #include <xen/interface/vcpu.h>
+#include <xen/interface/memory.h>
 #include <xen/features.h>
 #include <xen/page.h>
+#include <xen/hvm.h>
 #include <xen/hvc-console.h>
 
 #include <asm/paravirt.h>
@@ -55,7 +58,9 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 #include <asm/reboot.h>
+#include <asm/setup.h>
 #include <asm/stackprotector.h>
+#include <asm/hypervisor.h>
 
 #include "xen-ops.h"
 #include "mmu.h"
@@ -76,6 +81,10 @@ struct shared_info xen_dummy_shared_info;
 
 void *xen_initial_gdt;
 
+RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
+__read_mostly int xen_have_vector_callback;
+EXPORT_SYMBOL_GPL(xen_have_vector_callback);
+
 /*
  * Point at some empty memory to start with. We map the real shared_info
  * page as soon as fixmap is up and running.
@@ -97,6 +106,14 @@ struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
  */
 static int have_vcpu_info_placement = 1;
 
+static void clamp_max_cpus(void)
+{
+#ifdef CONFIG_SMP
+        if (setup_max_cpus > MAX_VIRT_CPUS)
+                setup_max_cpus = MAX_VIRT_CPUS;
+#endif
+}
+
 static void xen_vcpu_setup(int cpu)
 {
         struct vcpu_register_vcpu_info info;
@@ -104,13 +121,17 @@ static void xen_vcpu_setup(int cpu)
         struct vcpu_info *vcpup;
 
         BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
-        per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
 
-        if (!have_vcpu_info_placement)
-                return;         /* already tested, not available */
+        if (cpu < MAX_VIRT_CPUS)
+                per_cpu(xen_vcpu,cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
 
-        vcpup = &per_cpu(xen_vcpu_info, cpu);
+        if (!have_vcpu_info_placement) {
+                if (cpu >= MAX_VIRT_CPUS)
+                        clamp_max_cpus();
+                return;
+        }
 
+        vcpup = &per_cpu(xen_vcpu_info, cpu);
         info.mfn = arbitrary_virt_to_mfn(vcpup);
         info.offset = offset_in_page(vcpup);
 
@@ -125,6 +146,7 @@ static void xen_vcpu_setup(int cpu)
         if (err) {
                 printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
                 have_vcpu_info_placement = 0;
+                clamp_max_cpus();
         } else {
                 /* This cpu is using the registered vcpu info, even if
                    later ones fail to. */
@@ -731,7 +753,6 @@ static void set_xen_basic_apic_ops(void)
 
 #endif
 
-
 static void xen_clts(void)
 {
         struct multicall_space mcs;
@@ -926,10 +947,6 @@ static const struct pv_init_ops xen_init_ops __initdata = {
         .patch = xen_patch,
 };
 
-static const struct pv_time_ops xen_time_ops __initdata = {
-        .sched_clock = xen_sched_clock,
-};
-
 static const struct pv_cpu_ops xen_cpu_ops __initdata = {
         .cpuid = xen_cpuid,
 
@@ -1028,6 +1045,23 @@ static void xen_crash_shutdown(struct pt_regs *regs)
         xen_reboot(SHUTDOWN_crash);
 }
 
+static int
+xen_panic_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+        xen_reboot(SHUTDOWN_crash);
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block xen_panic_block = {
+        .notifier_call= xen_panic_event,
+};
+
+int xen_panic_handler_init(void)
+{
+        atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
+        return 0;
+}
+
 static const struct machine_ops __initdata xen_machine_ops = {
         .restart = xen_restart,
         .halt = xen_machine_halt,
@@ -1067,7 +1101,6 @@ asmlinkage void __init xen_start_kernel(void)
         /* Install Xen paravirt ops */
         pv_info = xen_info;
         pv_init_ops = xen_init_ops;
-        pv_time_ops = xen_time_ops;
         pv_cpu_ops = xen_cpu_ops;
         pv_apic_ops = xen_apic_ops;
 
@@ -1075,13 +1108,7 @@ asmlinkage void __init xen_start_kernel(void)
         x86_init.oem.arch_setup = xen_arch_setup;
         x86_init.oem.banner = xen_banner;
 
-        x86_init.timers.timer_init = xen_time_init;
-        x86_init.timers.setup_percpu_clockev = x86_init_noop;
-        x86_cpuinit.setup_percpu_clockev = x86_init_noop;
-
-        x86_platform.calibrate_tsc = xen_tsc_khz;
-        x86_platform.get_wallclock = xen_get_wallclock;
-        x86_platform.set_wallclock = xen_set_wallclock;
+        xen_init_time_ops();
 
         /*
          * Set up some pagetable state before starting to set any ptes.
@@ -1145,6 +1172,10 @@ asmlinkage void __init xen_start_kernel(void)
 
         pgd = (pgd_t *)xen_start_info->pt_base;
 
+        if (!xen_initial_domain())
+                __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
+
+        __supported_pte_mask |= _PAGE_IOMAP;
         /* Don't do the full vcpu_info placement stuff until we have a
            possible map and a non-dummy shared_info. */
         per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
@@ -1206,3 +1237,139 @@ asmlinkage void __init xen_start_kernel(void)
         x86_64_start_reservations((char *)__pa_symbol(&boot_params));
 #endif
 }
+
+static uint32_t xen_cpuid_base(void)
+{
+        uint32_t base, eax, ebx, ecx, edx;
+        char signature[13];
+
+        for (base = 0x40000000; base < 0x40010000; base += 0x100) {
+                cpuid(base, &eax, &ebx, &ecx, &edx);
+                *(uint32_t *)(signature + 0) = ebx;
+                *(uint32_t *)(signature + 4) = ecx;
+                *(uint32_t *)(signature + 8) = edx;
+                signature[12] = 0;
+
+                if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
+                        return base;
+        }
+
+        return 0;
+}
+
+static int init_hvm_pv_info(int *major, int *minor)
+{
+        uint32_t eax, ebx, ecx, edx, pages, msr, base;
+        u64 pfn;
+
+        base = xen_cpuid_base();
+        cpuid(base + 1, &eax, &ebx, &ecx, &edx);
+
+        *major = eax >> 16;
+        *minor = eax & 0xffff;
+        printk(KERN_INFO "Xen version %d.%d.\n", *major, *minor);
+
+        cpuid(base + 2, &pages, &msr, &ecx, &edx);
+
+        pfn = __pa(hypercall_page);
+        wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
+
+        xen_setup_features();
+
+        pv_info = xen_info;
+        pv_info.kernel_rpl = 0;
+
+        xen_domain_type = XEN_HVM_DOMAIN;
+
+        return 0;
+}
+
+void xen_hvm_init_shared_info(void)
+{
+        int cpu;
+        struct xen_add_to_physmap xatp;
+        static struct shared_info *shared_info_page = 0;
+
+        if (!shared_info_page)
+                shared_info_page = (struct shared_info *)
+                        extend_brk(PAGE_SIZE, PAGE_SIZE);
+        xatp.domid = DOMID_SELF;
+        xatp.idx = 0;
+        xatp.space = XENMAPSPACE_shared_info;
+        xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
+        if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
+                BUG();
+
+        HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
+
+        /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
+         * page, we use it in the event channel upcall and in some pvclock
+         * related functions. We don't need the vcpu_info placement
+         * optimizations because we don't use any pv_mmu or pv_irq op on
+         * HVM.
+         * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
+         * online but xen_hvm_init_shared_info is run at resume time too and
+         * in that case multiple vcpus might be online. */
+        for_each_online_cpu(cpu) {
+                per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+        }
+}
+
+#ifdef CONFIG_XEN_PVHVM
+static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self,
+                                    unsigned long action, void *hcpu)
+{
+        int cpu = (long)hcpu;
+        switch (action) {
+        case CPU_UP_PREPARE:
+                per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+                break;
+        default:
+                break;
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata xen_hvm_cpu_notifier = {
+        .notifier_call  = xen_hvm_cpu_notify,
+};
+
+static void __init xen_hvm_guest_init(void)
+{
+        int r;
+        int major, minor;
+
+        r = init_hvm_pv_info(&major, &minor);
+        if (r < 0)
+                return;
+
+        xen_hvm_init_shared_info();
+
+        if (xen_feature(XENFEAT_hvm_callback_vector))
+                xen_have_vector_callback = 1;
+        register_cpu_notifier(&xen_hvm_cpu_notifier);
+        xen_unplug_emulated_devices();
+        have_vcpu_info_placement = 0;
+        x86_init.irqs.intr_init = xen_init_IRQ;
+        xen_hvm_init_time_ops();
+        xen_hvm_init_mmu_ops();
+}
+
+static bool __init xen_hvm_platform(void)
+{
+        if (xen_pv_domain())
+                return false;
+
+        if (!xen_cpuid_base())
+                return false;
+
+        return true;
+}
+
+const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = {
+        .name                   = "Xen HVM",
+        .detect                 = xen_hvm_platform,
+        .init_platform          = xen_hvm_guest_init,
+};
+EXPORT_SYMBOL(x86_hyper_xen_hvm);
+#endif
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index b511f1986911..4fe04ac0bae0 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -42,6 +42,7 @@
 #include <linux/highmem.h>
 #include <linux/debugfs.h>
 #include <linux/bug.h>
+#include <linux/vmalloc.h>
 #include <linux/module.h>
 #include <linux/gfp.h>
 #include <linux/memblock.h>
@@ -52,14 +53,19 @@
 #include <asm/mmu_context.h>
 #include <asm/setup.h>
 #include <asm/paravirt.h>
+#include <asm/e820.h>
 #include <asm/linkage.h>
+#include <asm/page.h>
 
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
 
+#include <xen/xen.h>
 #include <xen/page.h>
 #include <xen/interface/xen.h>
+#include <xen/interface/hvm/hvm_op.h>
 #include <xen/interface/version.h>
+#include <xen/interface/memory.h>
 #include <xen/hvc-console.h>
 
 #include "multicalls.h"
@@ -68,6 +74,13 @@
 
 #define MMU_UPDATE_HISTO        30
 
+/*
+ * Protects atomic reservation decrease/increase against concurrent increases.
+ * Also protects non-atomic updates of current_pages and driver_pages, and
+ * balloon lists.
+ */
+DEFINE_SPINLOCK(xen_reservation_lock);
+
 #ifdef CONFIG_XEN_DEBUG_FS
 
 static struct {
@@ -378,6 +391,28 @@ static bool xen_page_pinned(void *ptr)
         return PagePinned(page);
 }
 
+static bool xen_iomap_pte(pte_t pte)
+{
+        return pte_flags(pte) & _PAGE_IOMAP;
+}
+
+static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval)
+{
+        struct multicall_space mcs;
+        struct mmu_update *u;
+
+        mcs = xen_mc_entry(sizeof(*u));
+        u = mcs.args;
+
+        /* ptep might be kmapped when using 32-bit HIGHPTE */
+        u->ptr = arbitrary_virt_to_machine(ptep).maddr;
+        u->val = pte_val_ma(pteval);
+
+        MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_IO);
+
+        xen_mc_issue(PARAVIRT_LAZY_MMU);
+}
+
 static void xen_extend_mmu_update(const struct mmu_update *update)
 {
         struct multicall_space mcs;
@@ -454,6 +489,11 @@ void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
 void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
                     pte_t *ptep, pte_t pteval)
 {
+        if (xen_iomap_pte(pteval)) {
+                xen_set_iomap_pte(ptep, pteval);
+                goto out;
+        }
+
         ADD_STATS(set_pte_at, 1);
 //      ADD_STATS(set_pte_at_pinned, xen_page_pinned(ptep));
         ADD_STATS(set_pte_at_current, mm == current->mm);
@@ -524,8 +564,25 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
         return val;
 }
 
+static pteval_t iomap_pte(pteval_t val)
+{
+        if (val & _PAGE_PRESENT) {
+                unsigned long pfn = (val & PTE_PFN_MASK) >> PAGE_SHIFT;
+                pteval_t flags = val & PTE_FLAGS_MASK;
+
+                /* We assume the pte frame number is a MFN, so
+                   just use it as-is. */
+                val = ((pteval_t)pfn << PAGE_SHIFT) | flags;
+        }
+
+        return val;
+}
+
 pteval_t xen_pte_val(pte_t pte)
 {
+        if (xen_initial_domain() && (pte.pte & _PAGE_IOMAP))
+                return pte.pte;
+
         return pte_mfn_to_pfn(pte.pte);
 }
 PV_CALLEE_SAVE_REGS_THUNK(xen_pte_val);
@@ -538,7 +595,22 @@ PV_CALLEE_SAVE_REGS_THUNK(xen_pgd_val);
 
 pte_t xen_make_pte(pteval_t pte)
 {
-        pte = pte_pfn_to_mfn(pte);
+        phys_addr_t addr = (pte & PTE_PFN_MASK);
+
+        /*
+         * Unprivileged domains are allowed to do IOMAPpings for
+         * PCI passthrough, but not map ISA space.  The ISA
+         * mappings are just dummy local mappings to keep other
+         * parts of the kernel happy.
+         */
+        if (unlikely(pte & _PAGE_IOMAP) &&
+            (xen_initial_domain() || addr >= ISA_END_ADDRESS)) {
+                pte = iomap_pte(pte);
+        } else {
+                pte &= ~_PAGE_IOMAP;
+                pte = pte_pfn_to_mfn(pte);
+        }
+
         return native_make_pte(pte);
 }
 PV_CALLEE_SAVE_REGS_THUNK(xen_make_pte);
@@ -594,6 +666,11 @@ void xen_set_pud(pud_t *ptr, pud_t val)
 
 void xen_set_pte(pte_t *ptep, pte_t pte)
 {
+        if (xen_iomap_pte(pte)) {
+                xen_set_iomap_pte(ptep, pte);
+                return;
+        }
+
         ADD_STATS(pte_update, 1);
 //      ADD_STATS(pte_update_pinned, xen_page_pinned(ptep));
         ADD_STATS(pte_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
@@ -610,6 +687,11 @@ void xen_set_pte(pte_t *ptep, pte_t pte)
 #ifdef CONFIG_X86_PAE
 void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
 {
+        if (xen_iomap_pte(pte)) {
+                xen_set_iomap_pte(ptep, pte);
+                return;
+        }
+
         set_64bit((u64 *)ptep, native_pte_val(pte));
 }
 
@@ -936,8 +1018,6 @@ static int xen_pin_page(struct mm_struct *mm, struct page *page,
    read-only, and can be pinned. */
 static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
 {
-        vm_unmap_aliases();
-
         xen_mc_batch();
 
         if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
@@ -1501,7 +1581,6 @@ static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned l
         if (PagePinned(virt_to_page(mm->pgd))) {
                 SetPagePinned(page);
 
-                vm_unmap_aliases();
                 if (!PageHighMem(page)) {
                         make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
                         if (level == PT_PTE && USE_SPLIT_PTLOCKS)
@@ -1812,9 +1891,16 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
                 pte = pfn_pte(phys, prot);
                 break;
 
-        default:
+        case FIX_PARAVIRT_BOOTMAP:
+                /* This is an MFN, but it isn't an IO mapping from the
+                   IO domain */
                 pte = mfn_pte(phys, prot);
                 break;
+
+        default:
+                /* By default, set_fixmap is used for hardware mappings */
+                pte = mfn_pte(phys, __pgprot(pgprot_val(prot) | _PAGE_IOMAP));
+                break;
         }
 
         __native_set_fixmap(idx, pte);
@@ -1940,8 +2026,240 @@ void __init xen_init_mmu_ops(void)
         x86_init.paging.pagetable_setup_start = xen_pagetable_setup_start;
         x86_init.paging.pagetable_setup_done = xen_pagetable_setup_done;
         pv_mmu_ops = xen_mmu_ops;
+
+        vmap_lazy_unmap = false;
+}
+
+/* Protected by xen_reservation_lock. */
+#define MAX_CONTIG_ORDER 9 /* 2MB */
+static unsigned long discontig_frames[1<<MAX_CONTIG_ORDER];
+
+#define VOID_PTE (mfn_pte(0, __pgprot(0)))
+static void xen_zap_pfn_range(unsigned long vaddr, unsigned int order,
+                                unsigned long *in_frames,
+                                unsigned long *out_frames)
+{
+        int i;
+        struct multicall_space mcs;
+
+        xen_mc_batch();
+        for (i = 0; i < (1UL<<order); i++, vaddr += PAGE_SIZE) {
+                mcs = __xen_mc_entry(0);
+
+                if (in_frames)
+                        in_frames[i] = virt_to_mfn(vaddr);
+
+                MULTI_update_va_mapping(mcs.mc, vaddr, VOID_PTE, 0);
+                set_phys_to_machine(virt_to_pfn(vaddr), INVALID_P2M_ENTRY);
+
+                if (out_frames)
+                        out_frames[i] = virt_to_pfn(vaddr);
+        }
+        xen_mc_issue(0);
+}
+
+/*
+ * Update the pfn-to-mfn mappings for a virtual address range, either to
+ * point to an array of mfns, or contiguously from a single starting
+ * mfn.
+ */
+static void xen_remap_exchanged_ptes(unsigned long vaddr, int order,
+                                     unsigned long *mfns,
+                                     unsigned long first_mfn)
+{
+        unsigned i, limit;
+        unsigned long mfn;
+
+        xen_mc_batch();
+
+        limit = 1u << order;
+        for (i = 0; i < limit; i++, vaddr += PAGE_SIZE) {
+                struct multicall_space mcs;
+                unsigned flags;
+
+                mcs = __xen_mc_entry(0);
+                if (mfns)
+                        mfn = mfns[i];
+                else
+                        mfn = first_mfn + i;
+
+                if (i < (limit - 1))
+                        flags = 0;
+                else {
+                        if (order == 0)
+                                flags = UVMF_INVLPG | UVMF_ALL;
+                        else
+                                flags = UVMF_TLB_FLUSH | UVMF_ALL;
+                }
+
+                MULTI_update_va_mapping(mcs.mc, vaddr,
+                                mfn_pte(mfn, PAGE_KERNEL), flags);
+
+                set_phys_to_machine(virt_to_pfn(vaddr), mfn);
+        }
+
+        xen_mc_issue(0);
+}
+
+/*
+ * Perform the hypercall to exchange a region of our pfns to point to
+ * memory with the required contiguous alignment.  Takes the pfns as
+ * input, and populates mfns as output.
+ *
+ * Returns a success code indicating whether the hypervisor was able to
+ * satisfy the request or not.
+ */
+static int xen_exchange_memory(unsigned long extents_in, unsigned int order_in,
+                               unsigned long *pfns_in,
+                               unsigned long extents_out,
+                               unsigned int order_out,
+                               unsigned long *mfns_out,
+                               unsigned int address_bits)
+{
+        long rc;
+        int success;
+
+        struct xen_memory_exchange exchange = {
+                .in = {
+                        .nr_extents   = extents_in,
+                        .extent_order = order_in,
+                        .extent_start = pfns_in,
+                        .domid        = DOMID_SELF
+                },
+                .out = {
+                        .nr_extents   = extents_out,
+                        .extent_order = order_out,
+                        .extent_start = mfns_out,
+                        .address_bits = address_bits,
+                        .domid        = DOMID_SELF
+                }
+        };
+
+        BUG_ON(extents_in << order_in != extents_out << order_out);
+
+        rc = HYPERVISOR_memory_op(XENMEM_exchange, &exchange);
+        success = (exchange.nr_exchanged == extents_in);
+
+        BUG_ON(!success && ((exchange.nr_exchanged != 0) || (rc == 0)));
+        BUG_ON(success && (rc != 0));
+
+        return success;
 }
 
+int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
+                                 unsigned int address_bits)
+{
+        unsigned long *in_frames = discontig_frames, out_frame;
+        unsigned long  flags;
+        int            success;
+
+        /*
+         * Currently an auto-translated guest will not perform I/O, nor will
+         * it require PAE page directories below 4GB. Therefore any calls to
+         * this function are redundant and can be ignored.
+         */
+
+        if (xen_feature(XENFEAT_auto_translated_physmap))
+                return 0;
+
+        if (unlikely(order > MAX_CONTIG_ORDER))
+                return -ENOMEM;
+
+        memset((void *) vstart, 0, PAGE_SIZE << order);
+
+        spin_lock_irqsave(&xen_reservation_lock, flags);
+
+        /* 1. Zap current PTEs, remembering MFNs. */
+        xen_zap_pfn_range(vstart, order, in_frames, NULL);
+
+        /* 2. Get a new contiguous memory extent. */
+        out_frame = virt_to_pfn(vstart);
+        success = xen_exchange_memory(1UL << order, 0, in_frames,
+                                      1, order, &out_frame,
+                                      address_bits);
+
+        /* 3. Map the new extent in place of old pages. */
+        if (success)
+                xen_remap_exchanged_ptes(vstart, order, NULL, out_frame);
+        else
+                xen_remap_exchanged_ptes(vstart, order, in_frames, 0);
+
+        spin_unlock_irqrestore(&xen_reservation_lock, flags);
+
+        return success ? 0 : -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(xen_create_contiguous_region);
+
+void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order)
+{
+        unsigned long *out_frames = discontig_frames, in_frame;
+        unsigned long  flags;
+        int success;
+
+        if (xen_feature(XENFEAT_auto_translated_physmap))
+                return;
+
+        if (unlikely(order > MAX_CONTIG_ORDER))
+                return;
+
+        memset((void *) vstart, 0, PAGE_SIZE << order);
+
+        spin_lock_irqsave(&xen_reservation_lock, flags);
+
+        /* 1. Find start MFN of contiguous extent. */
+        in_frame = virt_to_mfn(vstart);
+
+        /* 2. Zap current PTEs. */
+        xen_zap_pfn_range(vstart, order, NULL, out_frames);
+
+        /* 3. Do the exchange for non-contiguous MFNs. */
+        success = xen_exchange_memory(1, order, &in_frame, 1UL << order,
+                                        0, out_frames, 0);
+
+        /* 4. Map new pages in place of old pages. */
+        if (success)
+                xen_remap_exchanged_ptes(vstart, order, out_frames, 0);
+        else
+                xen_remap_exchanged_ptes(vstart, order, NULL, in_frame);
+
+        spin_unlock_irqrestore(&xen_reservation_lock, flags);
+}
+EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region);
+
+#ifdef CONFIG_XEN_PVHVM
+static void xen_hvm_exit_mmap(struct mm_struct *mm)
+{
+        struct xen_hvm_pagetable_dying a;
+        int rc;
+
+        a.domid = DOMID_SELF;
+        a.gpa = __pa(mm->pgd);
+        rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
+        WARN_ON_ONCE(rc < 0);
+}
+
+static int is_pagetable_dying_supported(void)
+{
+        struct xen_hvm_pagetable_dying a;
+        int rc = 0;
+
+        a.domid = DOMID_SELF;
+        a.gpa = 0x00;
+        rc = HYPERVISOR_hvm_op(HVMOP_pagetable_dying, &a);
+        if (rc < 0) {
+                printk(KERN_DEBUG "HVMOP_pagetable_dying not supported\n");
+                return 0;
+        }
+        return 1;
+}
+
+void __init xen_hvm_init_mmu_ops(void)
+{
+        if (is_pagetable_dying_supported())
+                pv_mmu_ops.exit_mmap = xen_hvm_exit_mmap;
+}
+#endif
+
 #ifdef CONFIG_XEN_DEBUG_FS
 
 static struct dentry *d_mmu_debug;
diff --git a/arch/x86/xen/mmu.h b/arch/x86/xen/mmu.h
index 5fe6bc7f5ecf..fa938c4aa2f7 100644
--- a/arch/x86/xen/mmu.h
+++ b/arch/x86/xen/mmu.h
@@ -60,4 +60,5 @@ void  xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 unsigned long xen_read_cr2_direct(void);
 
 extern void xen_init_mmu_ops(void);
+extern void xen_hvm_init_mmu_ops(void);
 #endif  /* _XEN_MMU_H */
diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
new file mode 100644
index 000000000000..a013ec9d0c54
--- /dev/null
+++ b/arch/x86/xen/pci-swiotlb-xen.c
@@ -0,0 +1,58 @@
+/* Glue code to lib/swiotlb-xen.c */
+
+#include <linux/dma-mapping.h>
+#include <xen/swiotlb-xen.h>
+
+#include <asm/xen/hypervisor.h>
+#include <xen/xen.h>
+
+int xen_swiotlb __read_mostly;
+
+static struct dma_map_ops xen_swiotlb_dma_ops = {
+        .mapping_error = xen_swiotlb_dma_mapping_error,
+        .alloc_coherent = xen_swiotlb_alloc_coherent,
+        .free_coherent = xen_swiotlb_free_coherent,
+        .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
+        .sync_single_for_device = xen_swiotlb_sync_single_for_device,
+        .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
+        .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
+        .map_sg = xen_swiotlb_map_sg_attrs,
+        .unmap_sg = xen_swiotlb_unmap_sg_attrs,
+        .map_page = xen_swiotlb_map_page,
+        .unmap_page = xen_swiotlb_unmap_page,
+        .dma_supported = xen_swiotlb_dma_supported,
+};
+
+/*
+ * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
+ *
+ * This returns non-zero if we are forced to use xen_swiotlb (by the boot
+ * option).
+ */
+int __init pci_xen_swiotlb_detect(void)
+{
+
+        /* If running as PV guest, either iommu=soft, or swiotlb=force will
+         * activate this IOMMU. If running as PV privileged, activate it
+         * irregardlesss.
+         */
+        if ((xen_initial_domain() || swiotlb || swiotlb_force) &&
+            (xen_pv_domain()))
+                xen_swiotlb = 1;
+
+        /* If we are running under Xen, we MUST disable the native SWIOTLB.
+         * Don't worry about swiotlb_force flag activating the native, as
+         * the 'swiotlb' flag is the only one turning it on. */
+        if (xen_pv_domain())
+                swiotlb = 0;
+
+        return xen_swiotlb;
+}
+
+void __init pci_xen_swiotlb_init(void)
+{
+        if (xen_swiotlb) {
+                xen_swiotlb_init(1);
+                dma_ops = &xen_swiotlb_dma_ops;
+        }
+}
diff --git a/arch/x86/xen/platform-pci-unplug.c b/arch/x86/xen/platform-pci-unplug.c
new file mode 100644
index 000000000000..0f456386cce5
--- /dev/null
+++ b/arch/x86/xen/platform-pci-unplug.c
@@ -0,0 +1,143 @@
+/******************************************************************************
+ * platform-pci-unplug.c
+ *
+ * Xen platform PCI device driver
+ * Copyright (c) 2010, Citrix
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+#include <xen/platform_pci.h>
+
+#define XEN_PLATFORM_ERR_MAGIC -1
+#define XEN_PLATFORM_ERR_PROTOCOL -2
+#define XEN_PLATFORM_ERR_BLACKLIST -3
+
+/* store the value of xen_emul_unplug after the unplug is done */
+int xen_platform_pci_unplug;
+EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
+#ifdef CONFIG_XEN_PVHVM
+static int xen_emul_unplug;
+
+static int __init check_platform_magic(void)
+{
+        short magic;
+        char protocol;
+
+        magic = inw(XEN_IOPORT_MAGIC);
+        if (magic != XEN_IOPORT_MAGIC_VAL) {
+                printk(KERN_ERR "Xen Platform PCI: unrecognised magic value\n");
+                return XEN_PLATFORM_ERR_MAGIC;
+        }
+
+        protocol = inb(XEN_IOPORT_PROTOVER);
+
+        printk(KERN_DEBUG "Xen Platform PCI: I/O protocol version %d\n",
+                        protocol);
+
+        switch (protocol) {
+        case 1:
+                outw(XEN_IOPORT_LINUX_PRODNUM, XEN_IOPORT_PRODNUM);
+                outl(XEN_IOPORT_LINUX_DRVVER, XEN_IOPORT_DRVVER);
+                if (inw(XEN_IOPORT_MAGIC) != XEN_IOPORT_MAGIC_VAL) {
+                        printk(KERN_ERR "Xen Platform: blacklisted by host\n");
+                        return XEN_PLATFORM_ERR_BLACKLIST;
+                }
+                break;
+        default:
+                printk(KERN_WARNING "Xen Platform PCI: unknown I/O protocol version");
+                return XEN_PLATFORM_ERR_PROTOCOL;
+        }
+
+        return 0;
+}
+
+void __init xen_unplug_emulated_devices(void)
+{
+        int r;
+
+        /* user explicitly requested no unplug */
+        if (xen_emul_unplug & XEN_UNPLUG_NEVER)
+                return;
+        /* check the version of the xen platform PCI device */
+        r = check_platform_magic();
+        /* If the version matches enable the Xen platform PCI driver.
+         * Also enable the Xen platform PCI driver if the host does
+         * not support the unplug protocol (XEN_PLATFORM_ERR_MAGIC)
+         * but the user told us that unplugging is unnecessary. */
+        if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
+                        (xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)))
+                return;
+        /* Set the default value of xen_emul_unplug depending on whether or
+         * not the Xen PV frontends and the Xen platform PCI driver have
+         * been compiled for this kernel (modules or built-in are both OK). */
+        if (!xen_emul_unplug) {
+                if (xen_must_unplug_nics()) {
+                        printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
+                                        "been compiled for this kernel: unplug emulated NICs.\n");
+                        xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
+                }
+                if (xen_must_unplug_disks()) {
+                        printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
+                                        "been compiled for this kernel: unplug emulated disks.\n"
+                                        "You might have to change the root device\n"
+                                        "from /dev/hd[a-d] to /dev/xvd[a-d]\n"
+                                        "in your root= kernel command line option\n");
+                        xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
+                }
+        }
+        /* Now unplug the emulated devices */
+        if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))
+                outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
+        xen_platform_pci_unplug = xen_emul_unplug;
+}
+
+static int __init parse_xen_emul_unplug(char *arg)
+{
+        char *p, *q;
+        int l;
+
+        for (p = arg; p; p = q) {
+                q = strchr(p, ',');
+                if (q) {
+                        l = q - p;
+                        q++;
+                } else {
+                        l = strlen(p);
+                }
+                if (!strncmp(p, "all", l))
+                        xen_emul_unplug |= XEN_UNPLUG_ALL;
+                else if (!strncmp(p, "ide-disks", l))
+                        xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
+                else if (!strncmp(p, "aux-ide-disks", l))
+                        xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS;
+                else if (!strncmp(p, "nics", l))
+                        xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
+                else if (!strncmp(p, "unnecessary", l))
+                        xen_emul_unplug |= XEN_UNPLUG_UNNECESSARY;
+                else if (!strncmp(p, "never", l))
+                        xen_emul_unplug |= XEN_UNPLUG_NEVER;
+                else
+                        printk(KERN_WARNING "unrecognised option '%s' "
+                                 "in parameter 'xen_emul_unplug'\n", p);
+        }
+        return 0;
+}
+early_param("xen_emul_unplug", parse_xen_emul_unplug);
+#endif
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 2ac8f29f89cb..9729c903404b 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -21,6 +21,7 @@
 #include <xen/page.h>
 #include <xen/interface/callback.h>
 #include <xen/interface/physdev.h>
+#include <xen/interface/memory.h>
 #include <xen/features.h>
 
 #include "xen-ops.h"
@@ -33,6 +34,73 @@ extern void xen_sysenter_target(void);
 extern void xen_syscall_target(void);
 extern void xen_syscall32_target(void);
 
+static unsigned long __init xen_release_chunk(phys_addr_t start_addr,
+                                              phys_addr_t end_addr)
+{
+        struct xen_memory_reservation reservation = {
+                .address_bits = 0,
+                .extent_order = 0,
+                .domid        = DOMID_SELF
+        };
+        unsigned long start, end;
+        unsigned long len = 0;
+        unsigned long pfn;
+        int ret;
+
+        start = PFN_UP(start_addr);
+        end = PFN_DOWN(end_addr);
+
+        if (end <= start)
+                return 0;
+
+        printk(KERN_INFO "xen_release_chunk: looking at area pfn %lx-%lx: ",
+               start, end);
+        for(pfn = start; pfn < end; pfn++) {
+                unsigned long mfn = pfn_to_mfn(pfn);
+
+                /* Make sure pfn exists to start with */
+                if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
+                        continue;
+
+                set_xen_guest_handle(reservation.extent_start, &mfn);
+                reservation.nr_extents = 1;
+
+                ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
+                                           &reservation);
+                WARN(ret != 1, "Failed to release memory %lx-%lx err=%d\n",
+                     start, end, ret);
+                if (ret == 1) {
+                        set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
+                        len++;
+                }
+        }
+        printk(KERN_CONT "%ld pages freed\n", len);
+
+        return len;
+}
+
+static unsigned long __init xen_return_unused_memory(unsigned long max_pfn,
+                                                     const struct e820map *e820)
+{
+        phys_addr_t max_addr = PFN_PHYS(max_pfn);
+        phys_addr_t last_end = 0;
+        unsigned long released = 0;
+        int i;
+
+        for (i = 0; i < e820->nr_map && last_end < max_addr; i++) {
+                phys_addr_t end = e820->map[i].addr;
+                end = min(max_addr, end);
+
+                released += xen_release_chunk(last_end, end);
+                last_end = e820->map[i].addr + e820->map[i].size;
+        }
+
+        if (last_end < max_addr)
+                released += xen_release_chunk(last_end, max_addr);
+
+        printk(KERN_INFO "released %ld pages of unused memory\n", released);
+        return released;
+}
 
 /**
  * machine_specific_memory_setup - Hook for machine specific memory setup.
@@ -68,6 +136,8 @@ char * __init xen_memory_setup(void)
 
         sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 
+        xen_return_unused_memory(xen_start_info->nr_pages, &e820);
+
         return "Xen";
 }
 
@@ -157,6 +227,8 @@ void __init xen_arch_setup(void)
         struct physdev_set_iopl set_iopl;
         int rc;
 
+        xen_panic_handler_init();
+
         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
         HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
 
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index a29693fd3138..25f232b18a82 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -394,6 +394,8 @@ static void stop_self(void *v)
         load_cr3(swapper_pg_dir);
         /* should set up a minimal gdt */
 
+        set_cpu_online(cpu, false);
+
         HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
         BUG();
 }
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index a9c661108034..1d789d56877c 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -26,6 +26,18 @@ void xen_pre_suspend(void)
                 BUG();
 }
 
+void xen_hvm_post_suspend(int suspend_cancelled)
+{
+        int cpu;
+        xen_hvm_init_shared_info();
+        xen_callback_vector();
+        if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
+                for_each_online_cpu(cpu) {
+                        xen_setup_runstate_info(cpu);
+                }
+        }
+}
+
 void xen_post_suspend(int suspend_cancelled)
 {
         xen_build_mfn_list_list();
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index b3c6c59ed302..1a5353a753fc 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -20,6 +20,7 @@
 #include <asm/xen/hypercall.h>
 
 #include <xen/events.h>
+#include <xen/features.h>
 #include <xen/interface/xen.h>
 #include <xen/interface/vcpu.h>
 
@@ -155,47 +156,8 @@ static void do_stolen_accounting(void)
         account_idle_ticks(ticks);
 }
 
-/*
- * Xen sched_clock implementation.  Returns the number of unstolen
- * nanoseconds, which is nanoseconds the VCPU spent in RUNNING+BLOCKED
- * states.
- */
-unsigned long long xen_sched_clock(void)
-{
-        struct vcpu_runstate_info state;
-        cycle_t now;
-        u64 ret;
-        s64 offset;
-
-        /*
-         * Ideally sched_clock should be called on a per-cpu basis
-         * anyway, so preempt should already be disabled, but that's
-         * not current practice at the moment.
-         */
-        preempt_disable();
-
-        now = xen_clocksource_read();
-
-        get_runstate_snapshot(&state);
-
-        WARN_ON(state.state != RUNSTATE_running);
-
-        offset = now - state.state_entry_time;
-        if (offset < 0)
-                offset = 0;
-
-        ret = state.time[RUNSTATE_blocked] +
-                state.time[RUNSTATE_running] +
-                offset;
-
-        preempt_enable();
-
-        return ret;
-}
-
-
 /* Get the TSC speed from Xen */
-unsigned long xen_tsc_khz(void)
+static unsigned long xen_tsc_khz(void)
 {
         struct pvclock_vcpu_time_info *info =
                 &HYPERVISOR_shared_info->vcpu_info[0].time;
@@ -230,7 +192,7 @@ static void xen_read_wallclock(struct timespec *ts)
         put_cpu_var(xen_vcpu);
 }
 
-unsigned long xen_get_wallclock(void)
+static unsigned long xen_get_wallclock(void)
 {
         struct timespec ts;
 
@@ -238,7 +200,7 @@ unsigned long xen_get_wallclock(void)
         return ts.tv_sec;
 }
 
-int xen_set_wallclock(unsigned long now)
+static int xen_set_wallclock(unsigned long now)
 {
         /* do nothing for domU */
         return -1;
@@ -473,7 +435,11 @@ void xen_timer_resume(void)
         }
 }
 
-__init void xen_time_init(void)
+static const struct pv_time_ops xen_time_ops __initdata = {
+        .sched_clock = xen_clocksource_read,
+};
+
+static __init void xen_time_init(void)
 {
         int cpu = smp_processor_id();
         struct timespec tp;
@@ -497,3 +463,47 @@ __init void xen_time_init(void)
         xen_setup_timer(cpu);
         xen_setup_cpu_clockevents();
 }
+
+__init void xen_init_time_ops(void)
+{
+        pv_time_ops = xen_time_ops;
+
+        x86_init.timers.timer_init = xen_time_init;
+        x86_init.timers.setup_percpu_clockev = x86_init_noop;
+        x86_cpuinit.setup_percpu_clockev = x86_init_noop;
+
+        x86_platform.calibrate_tsc = xen_tsc_khz;
+        x86_platform.get_wallclock = xen_get_wallclock;
+        x86_platform.set_wallclock = xen_set_wallclock;
+}
+
+#ifdef CONFIG_XEN_PVHVM
+static void xen_hvm_setup_cpu_clockevents(void)
+{
+        int cpu = smp_processor_id();
+        xen_setup_runstate_info(cpu);
+        xen_setup_timer(cpu);
+        xen_setup_cpu_clockevents();
+}
+
+__init void xen_hvm_init_time_ops(void)
+{
+        /* vector callback is needed otherwise we cannot receive interrupts
+         * on cpu > 0 */
+        if (!xen_have_vector_callback && num_present_cpus() > 1)
+                return;
+        if (!xen_feature(XENFEAT_hvm_safe_pvclock)) {
+                printk(KERN_INFO "Xen doesn't support pvclock on HVM,"
+                                "disable pv timer\n");
+                return;
+        }
+
+        pv_time_ops = xen_time_ops;
+        x86_init.timers.setup_percpu_clockev = xen_time_init;
+        x86_cpuinit.setup_percpu_clockev = xen_hvm_setup_cpu_clockevents;
+
+        x86_platform.calibrate_tsc = xen_tsc_khz;
+        x86_platform.get_wallclock = xen_get_wallclock;
+        x86_platform.set_wallclock = xen_set_wallclock;
+}
+#endif
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index f9153a300bce..7c8ab86163e9 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -38,6 +38,10 @@ void xen_enable_sysenter(void);
 void xen_enable_syscall(void);
 void xen_vcpu_restore(void);
 
+void xen_callback_vector(void);
+void xen_hvm_init_shared_info(void);
+void __init xen_unplug_emulated_devices(void);
+
 void __init xen_build_dynamic_phys_to_machine(void);
 
 void xen_init_irq_ops(void);
@@ -46,11 +50,8 @@ void xen_setup_runstate_info(int cpu);
 void xen_teardown_timer(int cpu);
 cycle_t xen_clocksource_read(void);
 void xen_setup_cpu_clockevents(void);
-unsigned long xen_tsc_khz(void);
-void __init xen_time_init(void);
-unsigned long xen_get_wallclock(void);
-int xen_set_wallclock(unsigned long time);
-unsigned long long xen_sched_clock(void);
+void __init xen_init_time_ops(void);
+void __init xen_hvm_init_time_ops(void);
 
 irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
 
@@ -101,4 +102,6 @@ void xen_sysret32(void);
 void xen_sysret64(void);
 void xen_adjust_exception_frame(void);
 
+extern int xen_panic_handler_init(void);
+
 #endif /* XEN_OPS_H */