Merge branch 'upstream/pvhvm' into upstream/xen

* upstream/pvhvm:
  Introduce CONFIG_XEN_PVHVM compile option
  blkfront: do not create a PV cdrom device if xen_hvm_guest
  support multiple .discard.* sections to avoid section type conflicts
  xen/pvhvm: fix build problem when !CONFIG_XEN
  xenfs: enable for HVM domains too
  x86: Call HVMOP_pagetable_dying on exit_mmap.
  x86: Unplug emulated disks and nics.
  x86: Use xen_vcpuop_clockevent, xen_clocksource and xen wallclock.
  xen: Fix find_unbound_irq in presence of ioapic irqs.
  xen: Add suspend/resume support for PV on HVM guests.
  xen: Xen PCI platform device driver.
  x86/xen: event channels delivery on HVM.
  x86: early PV on HVM features initialization.
  xen: Add support for HVM hypercalls.

Conflicts:
	arch/x86/xen/enlighten.c
	arch/x86/xen/time.c

9 files changed, 396 insertions, 22 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..930954685980 100644
--- a/arch/x86/xen/Makefile
+++ b/arch/x86/xen/Makefile
@@ -12,7 +12,7 @@ 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
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 3c4da8bee06f..d4ff5e83621d 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.
@@ -938,10 +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_clocksource_read,
-};
-
 static const struct pv_cpu_ops xen_cpu_ops __initdata = {
         .cpuid = xen_cpuid,
 
@@ -1096,7 +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;
 
@@ -1104,13 +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.
@@ -1235,3 +1233,139 @@ 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 914f04695ce5..413b19b3d0fe 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -58,6 +58,7 @@
 
 #include <xen/page.h>
 #include <xen/interface/xen.h>
+#include <xen/interface/hvm/hvm_op.h>
 #include <xen/interface/version.h>
 #include <xen/hvc-console.h>
 
@@ -1941,6 +1942,40 @@ void __init xen_init_mmu_ops(void)
         pv_mmu_ops = xen_mmu_ops;
 }
 
+#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/platform-pci-unplug.c b/arch/x86/xen/platform-pci-unplug.c
new file mode 100644
index 000000000000..554c002a1e1a
--- /dev/null
+++ b/arch/x86/xen/platform-pci-unplug.c
@@ -0,0 +1,137 @@
+/******************************************************************************
+ * 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;
+
+        /* 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 version is really old
+         * and the user told us to ignore it. */
+        if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
+                        (xen_emul_unplug & XEN_UNPLUG_IGNORE)))
+                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_IGNORE))
+                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, "ignore", l))
+                        xen_emul_unplug |= XEN_UNPLUG_IGNORE;
+                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/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 a86df42e46ad..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>
 
@@ -156,7 +157,7 @@ static void do_stolen_accounting(void)
 }
 
 /* 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;
@@ -191,7 +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;
 
@@ -199,7 +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;
@@ -434,7 +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;
@@ -458,3 +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 00d59d608edf..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);