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-rw-r--r--Documentation/ABI/testing/sysfs-devices-system-xen_cpu20
-rw-r--r--arch/x86/include/asm/xen/hypercall.h8
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c4
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce_amd.c22
-rw-r--r--arch/x86/xen/enlighten.c224
-rw-r--r--arch/x86/xen/mmu.c39
-rw-r--r--arch/x86/xen/setup.c23
-rw-r--r--arch/x86/xen/suspend.c2
-rw-r--r--arch/x86/xen/xen-ops.h2
-rw-r--r--drivers/tty/hvc/hvc_xen.c15
-rw-r--r--drivers/xen/Kconfig8
-rw-r--r--drivers/xen/Makefile2
-rw-r--r--drivers/xen/mcelog.c414
-rw-r--r--drivers/xen/pcpu.c371
-rw-r--r--drivers/xen/platform-pci.c18
-rw-r--r--drivers/xen/xen-acpi-processor.c9
-rw-r--r--drivers/xen/xenbus/xenbus_xs.c20
-rw-r--r--include/linux/miscdevice.h1
-rw-r--r--include/xen/events.h2
-rw-r--r--include/xen/interface/io/xs_wire.h3
-rw-r--r--include/xen/interface/platform.h8
-rw-r--r--include/xen/interface/xen-mca.h385
-rw-r--r--include/xen/interface/xen.h1
23 files changed, 1511 insertions, 90 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-xen_cpu b/Documentation/ABI/testing/sysfs-devices-system-xen_cpu
new file mode 100644
index 0000000..9ca02fb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-system-xen_cpu
@@ -0,0 +1,20 @@
+What: /sys/devices/system/xen_cpu/
+Date: May 2012
+Contact: Liu, Jinsong <jinsong.liu@intel.com>
+Description:
+ A collection of global/individual Xen physical cpu attributes
+
+ Individual physical cpu attributes are contained in
+ subdirectories named by the Xen's logical cpu number, e.g.:
+ /sys/devices/system/xen_cpu/xen_cpu#/
+
+
+What: /sys/devices/system/xen_cpu/xen_cpu#/online
+Date: May 2012
+Contact: Liu, Jinsong <jinsong.liu@intel.com>
+Description:
+ Interface to online/offline Xen physical cpus
+
+ When running under Xen platform, it provide user interface
+ to online/offline physical cpus, except cpu0 due to several
+ logic restrictions and assumptions.
diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
index 5728852..59c226d 100644
--- a/arch/x86/include/asm/xen/hypercall.h
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -48,6 +48,7 @@
#include <xen/interface/sched.h>
#include <xen/interface/physdev.h>
#include <xen/interface/platform.h>
+#include <xen/interface/xen-mca.h>
/*
* The hypercall asms have to meet several constraints:
@@ -302,6 +303,13 @@ HYPERVISOR_set_timer_op(u64 timeout)
}
static inline int
+HYPERVISOR_mca(struct xen_mc *mc_op)
+{
+ mc_op->interface_version = XEN_MCA_INTERFACE_VERSION;
+ return _hypercall1(int, mca, mc_op);
+}
+
+static inline int
HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
{
platform_op->interface_version = XENPF_INTERFACE_VERSION;
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 9473e87..5e095f8 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -60,8 +60,6 @@ static DEFINE_MUTEX(mce_chrdev_read_mutex);
int mce_disabled __read_mostly;
-#define MISC_MCELOG_MINOR 227
-
#define SPINUNIT 100 /* 100ns */
atomic_t mce_entry;
@@ -2346,7 +2344,7 @@ static __init int mcheck_init_device(void)
return err;
}
-device_initcall(mcheck_init_device);
+device_initcall_sync(mcheck_init_device);
/*
* Old style boot options parsing. Only for compatibility.
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 671b95a..c4e916d 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -759,4 +759,24 @@ static __init int threshold_init_device(void)
return 0;
}
-device_initcall(threshold_init_device);
+/*
+ * there are 3 funcs which need to be _initcalled in a logic sequence:
+ * 1. xen_late_init_mcelog
+ * 2. mcheck_init_device
+ * 3. threshold_init_device
+ *
+ * xen_late_init_mcelog must register xen_mce_chrdev_device before
+ * native mce_chrdev_device registration if running under xen platform;
+ *
+ * mcheck_init_device should be inited before threshold_init_device to
+ * initialize mce_device, otherwise a NULL ptr dereference will cause panic.
+ *
+ * so we use following _initcalls
+ * 1. device_initcall(xen_late_init_mcelog);
+ * 2. device_initcall_sync(mcheck_init_device);
+ * 3. late_initcall(threshold_init_device);
+ *
+ * when running under xen, the initcall order is 1,2,3;
+ * on baremetal, we skip 1 and we do only 2 and 3.
+ */
+late_initcall(threshold_init_device);
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index ed7d549..bf4bda6 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -31,6 +31,7 @@
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
+#include <linux/syscore_ops.h>
#include <xen/xen.h>
#include <xen/interface/xen.h>
@@ -38,6 +39,7 @@
#include <xen/interface/physdev.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/memory.h>
+#include <xen/interface/xen-mca.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/hvm.h>
@@ -107,7 +109,7 @@ 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.
*/
-struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
+struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
/*
* Flag to determine whether vcpu info placement is available on all
@@ -124,6 +126,19 @@ struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
*/
static int have_vcpu_info_placement = 1;
+struct tls_descs {
+ struct desc_struct desc[3];
+};
+
+/*
+ * Updating the 3 TLS descriptors in the GDT on every task switch is
+ * surprisingly expensive so we avoid updating them if they haven't
+ * changed. Since Xen writes different descriptors than the one
+ * passed in the update_descriptor hypercall we keep shadow copies to
+ * compare against.
+ */
+static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
+
static void clamp_max_cpus(void)
{
#ifdef CONFIG_SMP
@@ -341,9 +356,7 @@ static void __init xen_init_cpuid_mask(void)
unsigned int xsave_mask;
cpuid_leaf1_edx_mask =
- ~((1 << X86_FEATURE_MCE) | /* disable MCE */
- (1 << X86_FEATURE_MCA) | /* disable MCA */
- (1 << X86_FEATURE_MTRR) | /* disable MTRR */
+ ~((1 << X86_FEATURE_MTRR) | /* disable MTRR */
(1 << X86_FEATURE_ACC)); /* thermal monitoring */
if (!xen_initial_domain())
@@ -540,12 +553,28 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr)
BUG();
}
+static inline bool desc_equal(const struct desc_struct *d1,
+ const struct desc_struct *d2)
+{
+ return d1->a == d2->a && d1->b == d2->b;
+}
+
static void load_TLS_descriptor(struct thread_struct *t,
unsigned int cpu, unsigned int i)
{
- struct desc_struct *gdt = get_cpu_gdt_table(cpu);
- xmaddr_t maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
- struct multicall_space mc = __xen_mc_entry(0);
+ struct desc_struct *shadow = &per_cpu(shadow_tls_desc, cpu).desc[i];
+ struct desc_struct *gdt;
+ xmaddr_t maddr;
+ struct multicall_space mc;
+
+ if (desc_equal(shadow, &t->tls_array[i]))
+ return;
+
+ *shadow = t->tls_array[i];
+
+ gdt = get_cpu_gdt_table(cpu);
+ maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
+ mc = __xen_mc_entry(0);
MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
}
@@ -627,8 +656,8 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
/*
* Look for known traps using IST, and substitute them
* appropriately. The debugger ones are the only ones we care
- * about. Xen will handle faults like double_fault and
- * machine_check, so we should never see them. Warn if
+ * about. Xen will handle faults like double_fault,
+ * so we should never see them. Warn if
* there's an unexpected IST-using fault handler.
*/
if (addr == (unsigned long)debug)
@@ -643,7 +672,11 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
return 0;
#ifdef CONFIG_X86_MCE
} else if (addr == (unsigned long)machine_check) {
- return 0;
+ /*
+ * when xen hypervisor inject vMCE to guest,
+ * use native mce handler to handle it
+ */
+ ;
#endif
} else {
/* Some other trap using IST? */
@@ -1437,64 +1470,155 @@ asmlinkage void __init xen_start_kernel(void)
#endif
}
-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.name = "Xen HVM";
-
- xen_domain_type = XEN_HVM_DOMAIN;
+#ifdef CONFIG_XEN_PVHVM
+/*
+ * The pfn containing the shared_info is located somewhere in RAM. This
+ * will cause trouble if the current kernel is doing a kexec boot into a
+ * new kernel. The new kernel (and its startup code) can not know where
+ * the pfn is, so it can not reserve the page. The hypervisor will
+ * continue to update the pfn, and as a result memory corruption occours
+ * in the new kernel.
+ *
+ * One way to work around this issue is to allocate a page in the
+ * xen-platform pci device's BAR memory range. But pci init is done very
+ * late and the shared_info page is already in use very early to read
+ * the pvclock. So moving the pfn from RAM to MMIO is racy because some
+ * code paths on other vcpus could access the pfn during the small
+ * window when the old pfn is moved to the new pfn. There is even a
+ * small window were the old pfn is not backed by a mfn, and during that
+ * time all reads return -1.
+ *
+ * Because it is not known upfront where the MMIO region is located it
+ * can not be used right from the start in xen_hvm_init_shared_info.
+ *
+ * To minimise trouble the move of the pfn is done shortly before kexec.
+ * This does not eliminate the race because all vcpus are still online
+ * when the syscore_ops will be called. But hopefully there is no work
+ * pending at this point in time. Also the syscore_op is run last which
+ * reduces the risk further.
+ */
- return 0;
-}
+static struct shared_info *xen_hvm_shared_info;
-void __ref xen_hvm_init_shared_info(void)
+static void xen_hvm_connect_shared_info(unsigned long pfn)
{
- 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;
+ xatp.gpfn = pfn;
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
- HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
+}
+static void xen_hvm_set_shared_info(struct shared_info *sip)
+{
+ int cpu;
+
+ HYPERVISOR_shared_info = sip;
/* 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
+ * When xen_hvm_set_shared_info is run at boot time only vcpu 0 is
+ * online but xen_hvm_set_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
+/* Reconnect the shared_info pfn to a mfn */
+void xen_hvm_resume_shared_info(void)
+{
+ xen_hvm_connect_shared_info(__pa(xen_hvm_shared_info) >> PAGE_SHIFT);
+}
+
+#ifdef CONFIG_KEXEC
+static struct shared_info *xen_hvm_shared_info_kexec;
+static unsigned long xen_hvm_shared_info_pfn_kexec;
+
+/* Remember a pfn in MMIO space for kexec reboot */
+void __devinit xen_hvm_prepare_kexec(struct shared_info *sip, unsigned long pfn)
+{
+ xen_hvm_shared_info_kexec = sip;
+ xen_hvm_shared_info_pfn_kexec = pfn;
+}
+
+static void xen_hvm_syscore_shutdown(void)
+{
+ struct xen_memory_reservation reservation = {
+ .domid = DOMID_SELF,
+ .nr_extents = 1,
+ };
+ unsigned long prev_pfn;
+ int rc;
+
+ if (!xen_hvm_shared_info_kexec)
+ return;
+
+ prev_pfn = __pa(xen_hvm_shared_info) >> PAGE_SHIFT;
+ set_xen_guest_handle(reservation.extent_start, &prev_pfn);
+
+ /* Move pfn to MMIO, disconnects previous pfn from mfn */
+ xen_hvm_connect_shared_info(xen_hvm_shared_info_pfn_kexec);
+
+ /* Update pointers, following hypercall is also a memory barrier */
+ xen_hvm_set_shared_info(xen_hvm_shared_info_kexec);
+
+ /* Allocate new mfn for previous pfn */
+ do {
+ rc = HYPERVISOR_memory_op(XENMEM_populate_physmap, &reservation);
+ if (rc == 0)
+ msleep(123);
+ } while (rc == 0);
+
+ /* Make sure the previous pfn is really connected to a (new) mfn */
+ BUG_ON(rc != 1);
+}
+
+static struct syscore_ops xen_hvm_syscore_ops = {
+ .shutdown = xen_hvm_syscore_shutdown,
+};
+#endif
+
+/* Use a pfn in RAM, may move to MMIO before kexec. */
+static void __init xen_hvm_init_shared_info(void)
+{
+ /* Remember pointer for resume */
+ xen_hvm_shared_info = extend_brk(PAGE_SIZE, PAGE_SIZE);
+ xen_hvm_connect_shared_info(__pa(xen_hvm_shared_info) >> PAGE_SHIFT);
+ xen_hvm_set_shared_info(xen_hvm_shared_info);
+}
+
+static void __init init_hvm_pv_info(void)
+{
+ int major, 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.name = "Xen HVM";
+
+ xen_domain_type = XEN_HVM_DOMAIN;
+}
+
static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
@@ -1517,14 +1641,12 @@ static struct notifier_block xen_hvm_cpu_notifier __cpuinitdata = {
static void __init xen_hvm_guest_init(void)
{
- int r;
- int major, minor;
-
- r = init_hvm_pv_info(&major, &minor);
- if (r < 0)
- return;
+ init_hvm_pv_info();
xen_hvm_init_shared_info();
+#ifdef CONFIG_KEXEC
+ register_syscore_ops(&xen_hvm_syscore_ops);
+#endif
if (xen_feature(XENFEAT_hvm_callback_vector))
xen_have_vector_callback = 1;
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 3a73785..27336df 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -308,8 +308,20 @@ static bool xen_batched_set_pte(pte_t *ptep, pte_t pteval)
static inline void __xen_set_pte(pte_t *ptep, pte_t pteval)
{
- if (!xen_batched_set_pte(ptep, pteval))
- native_set_pte(ptep, pteval);
+ if (!xen_batched_set_pte(ptep, pteval)) {
+ /*
+ * Could call native_set_pte() here and trap and
+ * emulate the PTE write but with 32-bit guests this
+ * needs two traps (one for each of the two 32-bit
+ * words in the PTE) so do one hypercall directly
+ * instead.
+ */
+ struct mmu_update u;
+
+ u.ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;
+ u.val = pte_val_ma(pteval);
+ HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF);
+ }
}
static void xen_set_pte(pte_t *ptep, pte_t pteval)
@@ -1416,13 +1428,28 @@ static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
}
#endif /* CONFIG_X86_64 */
-/* Init-time set_pte while constructing initial pagetables, which
- doesn't allow RO pagetable pages to be remapped RW */
+/*
+ * Init-time set_pte while constructing initial pagetables, which
+ * doesn't allow RO page table pages to be remapped RW.
+ *
+ * If there is no MFN for this PFN then this page is initially
+ * ballooned out so clear the PTE (as in decrease_reservation() in
+ * drivers/xen/balloon.c).
+ *
+ * Many of these PTE updates are done on unpinned and writable pages
+ * and doing a hypercall for these is unnecessary and expensive. At
+ * this point it is not possible to tell if a page is pinned or not,
+ * so always write the PTE directly and rely on Xen trapping and
+ * emulating any updates as necessary.
+ */
static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
{
- pte = mask_rw_pte(ptep, pte);
+ if (pte_mfn(pte) != INVALID_P2M_ENTRY)
+ pte = mask_rw_pte(ptep, pte);
+ else
+ pte = __pte_ma(0);
- xen_set_pte(ptep, pte);
+ native_set_pte(ptep, pte);
}
static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a4790bf..ead8557 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -157,25 +157,24 @@ static unsigned long __init xen_populate_chunk(
unsigned long dest_pfn;
for (i = 0, entry = list; i < map_size; i++, entry++) {
- unsigned long credits = credits_left;
unsigned long s_pfn;
unsigned long e_pfn;
unsigned long pfns;
long capacity;
- if (credits <= 0)
+ if (credits_left <= 0)
break;
if (entry->type != E820_RAM)
continue;
- e_pfn = PFN_UP(entry->addr + entry->size);
+ e_pfn = PFN_DOWN(entry->addr + entry->size);
/* We only care about E820 after the xen_start_info->nr_pages */
if (e_pfn <= max_pfn)
continue;
- s_pfn = PFN_DOWN(entry->addr);
+ s_pfn = PFN_UP(entry->addr);
/* If the E820 falls within the nr_pages, we want to start
* at the nr_pages PFN.
* If that would mean going past the E820 entry, skip it
@@ -184,23 +183,19 @@ static unsigned long __init xen_populate_chunk(
capacity = e_pfn - max_pfn;
dest_pfn = max_pfn;
} else {
- /* last_pfn MUST be within E820_RAM regions */
- if (*last_pfn && e_pfn >= *last_pfn)
- s_pfn = *last_pfn;
capacity = e_pfn - s_pfn;
dest_pfn = s_pfn;
}
- /* If we had filled this E820_RAM entry, go to the next one. */
- if (capacity <= 0)
- continue;
- if (credits > capacity)
- credits = capacity;
+ if (credits_left < capacity)
+ capacity = credits_left;
- pfns = xen_do_chunk(dest_pfn, dest_pfn + credits, false);
+ pfns = xen_do_chunk(dest_pfn, dest_pfn + capacity, false);
done += pfns;
- credits_left -= pfns;
*last_pfn = (dest_pfn + pfns);
+ if (pfns < capacity)
+ break;
+ credits_left -= pfns;
}
return done;
}
diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index 45329c8..ae8a00c 100644
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -30,7 +30,7 @@ void xen_arch_hvm_post_suspend(int suspend_cancelled)
{
#ifdef CONFIG_XEN_PVHVM
int cpu;
- xen_hvm_init_shared_info();
+ xen_hvm_resume_shared_info();
xen_callback_vector();
xen_unplug_emulated_devices();
if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 202d4c1..1e4329e 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -41,7 +41,7 @@ void xen_enable_syscall(void);
void xen_vcpu_restore(void);
void xen_callback_vector(void);
-void xen_hvm_init_shared_info(void);
+void xen_hvm_resume_shared_info(void);
void xen_unplug_emulated_devices(void);
void __init xen_build_dynamic_phys_to_machine(void);
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index 944eaeb..1e456dc 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -209,11 +209,10 @@ static int xen_hvm_console_init(void)
info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
if (!info)
return -ENOMEM;
- }
-
- /* already configured */
- if (info->intf != NULL)
+ } else if (info->intf != NULL) {
+ /* already configured */
return 0;
+ }
/*
* If the toolstack (or the hypervisor) hasn't set these values, the
* default value is 0. Even though mfn = 0 and evtchn = 0 are
@@ -259,12 +258,10 @@ static int xen_pv_console_init(void)
info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
if (!info)
return -ENOMEM;
- }
-
- /* already configured */
- if (info->intf != NULL)
+ } else if (info->intf != NULL) {
+ /* already configured */
return 0;
-
+ }
info->evtchn = xen_start_info->console.domU.evtchn;
info->intf = mfn_to_virt(xen_start_info->console.domU.mfn);
info->vtermno = HVC_COOKIE;
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 8d2501e..d4dffcd 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -196,4 +196,12 @@ config XEN_ACPI_PROCESSOR
called xen_acpi_processor If you do not know what to choose, select
M here. If the CPUFREQ drivers are built in, select Y here.
+config XEN_MCE_LOG
+ bool "Xen platform mcelog"
+ depends on XEN_DOM0 && X86_64 && X86_MCE
+ default n
+ help
+ Allow kernel fetching MCE error from Xen platform and
+ converting it into Linux mcelog format for mcelog tools
+
endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index fc34886..d80bea5 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -17,7 +17,9 @@ obj-$(CONFIG_XEN_SYS_HYPERVISOR) += sys-hypervisor.o
obj-$(CONFIG_XEN_PVHVM) += platform-pci.o
obj-$(CONFIG_XEN_TMEM) += tmem.o
obj-$(CONFIG_SWIOTLB_XEN) += swiotlb-xen.o
+obj-$(CONFIG_XEN_DOM0) += pcpu.o
obj-$(CONFIG_XEN_DOM0) += pci.o acpi.o
+obj-$(CONFIG_XEN_MCE_LOG) += mcelog.o
obj-$(CONFIG_XEN_PCIDEV_BACKEND) += xen-pciback/
obj-$(CONFIG_XEN_PRIVCMD) += xen-privcmd.o
obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o
diff --git a/drivers/xen/mcelog.c b/drivers/xen/mcelog.c
new file mode 100644
index 0000000..8feee08
--- /dev/null
+++ b/drivers/xen/mcelog.c
@@ -0,0 +1,414 @@
+/******************************************************************************
+ * mcelog.c
+ * Driver for receiving and transferring machine check error infomation
+ *
+ * Copyright (c) 2012 Intel Corporation
+ * Author: Liu, Jinsong <jinsong.liu@intel.com>
+ * Author: Jiang, Yunhong <yunhong.jiang@intel.com>
+ * Author: Ke, Liping <liping.ke@intel.com>
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/uaccess.h>
+#include <linux/capability.h>
+#include <linux/poll.h>
+#include <linux/sched.h>
+
+#include <xen/interface/xen.h>
+#include <xen/events.h>
+#include <xen/interface/vcpu.h>
+#include <xen/xen.h>
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+#define XEN_MCELOG "xen_mcelog: "
+
+static struct mc_info g_mi;
+static struct mcinfo_logical_cpu *g_physinfo;
+static uint32_t ncpus;
+
+static DEFINE_MUTEX(mcelog_lock);
+
+static struct xen_mce_log xen_mcelog = {
+ .signature = XEN_MCE_LOG_SIGNATURE,
+ .len = XEN_MCE_LOG_LEN,
+ .recordlen = sizeof(struct xen_mce),
+};
+
+static DEFINE_SPINLOCK(xen_mce_chrdev_state_lock);
+static int xen_mce_chrdev_open_count; /* #times opened */
+static int xen_mce_chrdev_open_exclu; /* already open exclusive? */
+
+static DECLARE_WAIT_QUEUE_HEAD(xen_mce_chrdev_wait);
+
+static int xen_mce_chrdev_open(struct inode *inode, struct file *file)
+{
+ spin_lock(&xen_mce_chrdev_state_lock);
+
+ if (xen_mce_chrdev_open_exclu ||
+ (xen_mce_chrdev_open_count && (file->f_flags & O_EXCL))) {
+ spin_unlock(&xen_mce_chrdev_state_lock);
+
+ return -EBUSY;
+ }
+
+ if (file->f_flags & O_EXCL)
+ xen_mce_chrdev_open_exclu = 1;
+ xen_mce_chrdev_open_count++;
+
+ spin_unlock(&xen_mce_chrdev_state_lock);
+
+ return nonseekable_open(inode, file);
+}
+
+static int xen_mce_chrdev_release(struct inode *inode, struct file *file)
+{
+ spin_lock(&xen_mce_chrdev_state_lock);
+
+ xen_mce_chrdev_open_count--;
+ xen_mce_chrdev_open_exclu = 0;
+
+ spin_unlock(&xen_mce_chrdev_state_lock);
+
+ return 0;
+}
+
+static ssize_t xen_mce_chrdev_read(struct file *filp, char __user *ubuf,
+ size_t usize, loff_t *off)
+{
+ char __user *buf = ubuf;
+ unsigned num;
+ int i, err;
+
+ mutex_lock(&mcelog_lock);
+
+ num = xen_mcelog.next;
+
+ /* Only supports full reads right now */
+ err = -EINVAL;
+ if (*off != 0 || usize < XEN_MCE_LOG_LEN*sizeof(struct xen_mce))
+ goto out;
+
+ err = 0;
+ for (i = 0; i < num; i++) {
+ struct xen_mce *m = &xen_mcelog.entry[i];
+
+ err |= copy_to_user(buf, m, sizeof(*m));
+ buf += sizeof(*m);
+ }
+
+ memset(xen_mcelog.entry, 0, num * sizeof(struct xen_mce));
+ xen_mcelog.next = 0;
+
+ if (err)
+ err = -EFAULT;
+
+out:
+ mutex_unlock(&mcelog_lock);
+
+ return err ? err : buf - ubuf;
+}
+
+static unsigned int xen_mce_chrdev_poll(struct file *file, poll_table *wait)
+{
+ poll_wait(file, &xen_mce_chrdev_wait, wait);
+
+ if (xen_mcelog.next)
+ return POLLIN | POLLRDNORM;
+
+ return 0;
+}
+
+static long xen_mce_chrdev_ioctl(struct file *f, unsigned int cmd,
+ unsigned long arg)
+{
+ int __user *p = (int __user *)arg;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ switch (cmd) {
+ case MCE_GET_RECORD_LEN:
+ return put_user(sizeof(struct xen_mce), p);
+ case MCE_GET_LOG_LEN:
+ return put_user(XEN_MCE_LOG_LEN, p);
+ case MCE_GETCLEAR_FLAGS: {
+ unsigned flags;
+
+ do {
+ flags = xen_mcelog.flags;
+ } while (cmpxchg(&xen_mcelog.flags, flags, 0) != flags);
+
+ return put_user(flags, p);
+ }
+ default:
+ return -ENOTTY;
+ }
+}
+
+static const struct file_operations xen_mce_chrdev_ops = {
+ .open = xen_mce_chrdev_open,
+ .release = xen_mce_chrdev_release,
+ .read = xen_mce_chrdev_read,
+ .poll = xen_mce_chrdev_poll,
+ .unlocked_ioctl = xen_mce_chrdev_ioctl,
+ .llseek = no_llseek,
+};
+
+static struct miscdevice xen_mce_chrdev_device = {
+ MISC_MCELOG_MINOR,
+ "mcelog",
+ &xen_mce_chrdev_ops,
+};
+
+/*
+ * Caller should hold the mcelog_lock
+ */
+static void xen_mce_log(struct xen_mce *mce)
+{
+ unsigned entry;
+
+ entry = xen_mcelog.next;
+
+ /*
+ * When the buffer fills up discard new entries.
+ * Assume that the earlier errors are the more
+ * interesting ones:
+ */
+ if (entry >= XEN_MCE_LOG_LEN) {
+ set_bit(XEN_MCE_OVERFLOW,
+ (unsigned long *)&xen_mcelog.flags);
+ return;
+ }
+
+ memcpy(xen_mcelog.entry + entry, mce, sizeof(struct xen_mce));
+
+ xen_mcelog.next++;
+}
+
+static int convert_log(struct mc_info *mi)
+{
+ struct mcinfo_common *mic;
+ struct mcinfo_global *mc_global;
+ struct mcinfo_bank *mc_bank;
+ struct xen_mce m;
+ uint32_t i;
+
+ mic = NULL;
+ x86_mcinfo_lookup(&mic, mi, MC_TYPE_GLOBAL);
+ if (unlikely(!mic)) {
+ pr_warning(XEN_MCELOG "Failed to find global error info\n");
+ return -ENODEV;
+ }
+
+ memset(&m, 0, sizeof(struct xen_mce));
+
+ mc_global = (struct mcinfo_global *)mic;
+ m.mcgstatus = mc_global->mc_gstatus;
+ m.apicid = mc_global->mc_apicid;
+
+ for (i = 0; i < ncpus; i++)
+ if (g_physinfo[i].mc_apicid == m.apicid)
+ break;
+ if (unlikely(i == ncpus)) {
+ pr_warning(XEN_MCELOG "Failed to match cpu with apicid %d\n",
+ m.apicid);
+ return -ENODEV;
+ }
+
+ m.socketid = g_physinfo[i].mc_chipid;
+ m.cpu = m.extcpu = g_physinfo[i].mc_cpunr;
+ m.cpuvendor = (__u8)g_physinfo[i].mc_vendor;
+ m.mcgcap = g_physinfo[i].mc_msrvalues[__MC_MSR_MCGCAP].value;
+
+ mic = NULL;
+ x86_mcinfo_lookup(&mic, mi, MC_TYPE_BANK);
+ if (unlikely(!mic)) {
+ pr_warning(XEN_MCELOG "Fail to find bank error info\n");
+ return -ENODEV;
+ }
+
+ do {
+ if ((!mic) || (mic->size == 0) ||
+ (mic->type != MC_TYPE_GLOBAL &&
+ mic->type != MC_TYPE_BANK &&
+ mic->type != MC_TYPE_EXTENDED &&
+ mic->type != MC_TYPE_RECOVERY))
+ break;
+
+ if (mic->type == MC_TYPE_BANK) {
+ mc_bank = (struct mcinfo_bank *)mic;
+ m.misc = mc_bank->mc_misc;
+ m.status = mc_bank->mc_status;
+ m.addr = mc_bank->mc_addr;
+ m.tsc = mc_bank->mc_tsc;
+ m.bank = mc_bank->mc_bank;
+ m.finished = 1;
+ /*log this record*/
+ xen_mce_log(&m);
+ }
+ mic = x86_mcinfo_next(mic);
+ } while (1);
+
+ return 0;
+}
+
+static int mc_queue_handle(uint32_t flags)
+{
+ struct xen_mc mc_op;
+ int ret = 0;
+
+ mc_op.cmd = XEN_MC_fetch;
+ mc_op.interface_version = XEN_MCA_INTERFACE_VERSION;
+ set_xen_guest_handle(mc_op.u.mc_fetch.data, &g_mi);
+ do {
+ mc_op.u.mc_fetch.flags = flags;
+ ret = HYPERVISOR_mca(&mc_op);
+ if (ret) {
+ pr_err(XEN_MCELOG "Failed to fetch %s error log\n",
+ (flags == XEN_MC_URGENT) ?
+ "urgnet" : "nonurgent");
+ break;
+ }
+
+ if (mc_op.u.mc_fetch.flags & XEN_MC_NODATA ||
+ mc_op.u.mc_fetch.flags & XEN_MC_FETCHFAILED)
+ break;
+ else {
+ ret = convert_log(&g_mi);
+ if (ret)
+ pr_warning(XEN_MCELOG
+ "Failed to convert this error log, "
+ "continue acking it anyway\n");
+
+ mc_op.u.mc_fetch.flags = flags | XEN_MC_ACK;
+ ret = HYPERVISOR_mca(&mc_op);
+ if (ret) {
+ pr_err(XEN_MCELOG
+ "Failed to ack previous error log\n");
+ break;
+ }
+ }
+ } while (1);
+
+ return ret;
+}
+
+/* virq handler for machine check error info*/
+static void xen_mce_work_fn(struct work_struct *work)
+{
+ int err;
+
+ mutex_lock(&mcelog_lock);
+
+ /* urgent mc_info */
+ err = mc_queue_handle(XEN_MC_URGENT);
+ if (err)
+ pr_err(XEN_MCELOG
+ "Failed to handle urgent mc_info queue, "
+ "continue handling nonurgent mc_info queue anyway.\n");
+
+ /* nonurgent mc_info */
+ err = mc_queue_handle(XEN_MC_NONURGENT);
+ if (err)
+ pr_err(XEN_MCELOG
+ "Failed to handle nonurgent mc_info queue.\n");
+
+ /* wake processes polling /dev/mcelog */
+ wake_up_interruptible(&xen_mce_chrdev_wait);
+
+ mutex_unlock(&mcelog_lock);
+}
+static DECLARE_WORK(xen_mce_work, xen_mce_work_fn);
+
+static irqreturn_t xen_mce_interrupt(int irq, void *dev_id)
+{
+ schedule_work(&xen_mce_work);
+ return IRQ_HANDLED;
+}
+
+static int bind_virq_for_mce(void)
+{
+ int ret;
+ struct xen_mc mc_op;
+
+ memset(&mc_op, 0, sizeof(struct xen_mc));
+
+ /* Fetch physical CPU Numbers */
+ mc_op.cmd = XEN_MC_physcpuinfo;
+ mc_op.interface_version = XEN_MCA_INTERFACE_VERSION;
+ set_xen_guest_handle(mc_op.u.mc_physcpuinfo.info, g_physinfo);
+ ret = HYPERVISOR_mca(&mc_op);
+ if (ret) {
+ pr_err(XEN_MCELOG "Failed to get CPU numbers\n");
+ return ret;
+ }
+
+ /* Fetch each CPU Physical Info for later reference*/
+ ncpus = mc_op.u.mc_physcpuinfo.ncpus;
+ g_physinfo = kcalloc(ncpus, sizeof(struct mcinfo_logical_cpu),
+ GFP_KERNEL);
+ if (!g_physinfo)
+ return -ENOMEM;
+ set_xen_guest_handle(mc_op.u.mc_physcpuinfo.info, g_physinfo);
+ ret = HYPERVISOR_mca(&mc_op);
+ if (ret) {
+ pr_err(XEN_MCELOG "Failed to get CPU info\n");
+ kfree(g_physinfo);
+ return ret;
+ }
+
+ ret = bind_virq_to_irqhandler(VIRQ_MCA, 0,
+ xen_mce_interrupt, 0, "mce", NULL);
+ if (ret < 0) {
+ pr_err(XEN_MCELOG "Failed to bind virq\n");
+ kfree(g_physinfo);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int __init xen_late_init_mcelog(void)
+{
+ /* Only DOM0 is responsible for MCE logging */
+ if (xen_initial_domain()) {
+ /* register character device /dev/mcelog for xen mcelog */
+ if (misc_register(&xen_mce_chrdev_device))
+ return -ENODEV;
+ return bind_virq_for_mce();
+ }
+
+ return -ENODEV;
+}
+device_initcall(xen_late_init_mcelog);
diff --git a/drivers/xen/pcpu.c b/drivers/xen/pcpu.c
new file mode 100644
index 0000000..067fcfa
--- /dev/null
+++ b/drivers/xen/pcpu.c
@@ -0,0 +1,371 @@
+/******************************************************************************
+ * pcpu.c
+ * Management physical cpu in dom0, get pcpu info and provide sys interface
+ *
+ * Copyright (c) 2012 Intel Corporation
+ * Author: Liu, Jinsong <jinsong.liu@intel.com>
+ * Author: Jiang, Yunhong <yunhong.jiang@intel.com>
+ *
+ * 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.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/cpu.h>
+#include <linux/stat.h>
+#include <linux/capability.h>
+
+#include <xen/xen.h>
+#include <xen/xenbus.h>
+#include <xen/events.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/hypercall.h>
+
+#define XEN_PCPU "xen_cpu: "
+
+/*
+ * @cpu_id: Xen physical cpu logic number
+ * @flags: Xen physical cpu status flag
+ * - XEN_PCPU_FLAGS_ONLINE: cpu is online
+ * - XEN_PCPU_FLAGS_INVALID: cpu is not present
+ */
+struct pcpu {
+ struct list_head list;
+ struct device dev;
+ uint32_t cpu_id;
+ uint32_t flags;
+};
+
+static struct bus_type xen_pcpu_subsys = {
+ .name = "xen_cpu",
+ .dev_name = "xen_cpu",
+};
+
+static DEFINE_MUTEX(xen_pcpu_lock);
+
+static LIST_HEAD(xen_pcpus);
+
+static int xen_pcpu_down(uint32_t cpu_id)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_cpu_offline,
+ .interface_version = XENPF_INTERFACE_VERSION,
+ .u.cpu_ol.cpuid = cpu_id,
+ };
+
+ return HYPERVISOR_dom0_op(&op);
+}
+
+static int xen_pcpu_up(uint32_t cpu_id)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_cpu_online,
+ .interface_version = XENPF_INTERFACE_VERSION,
+ .u.cpu_ol.cpuid = cpu_id,
+ };
+
+ return HYPERVISOR_dom0_op(&op);
+}
+
+static ssize_t show_online(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct pcpu *cpu = container_of(dev, struct pcpu, dev);
+
+ return sprintf(buf, "%u\n", !!(cpu->flags & XEN_PCPU_FLAGS_ONLINE));
+}
+
+static ssize_t __ref store_online(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pcpu *pcpu = container_of(dev, struct pcpu, dev);
+ unsigned long long val;
+ ssize_t ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (kstrtoull(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ switch (val) {
+ case 0:
+ ret = xen_pcpu_down(pcpu->cpu_id);
+ break;
+ case 1:
+ ret = xen_pcpu_up(pcpu->cpu_id);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (ret >= 0)
+ ret = count;
+ return ret;
+}
+static DEVICE_ATTR(online, S_IRUGO | S_IWUSR, show_online, store_online);
+
+static bool xen_pcpu_online(uint32_t flags)
+{
+ return !!(flags & XEN_PCPU_FLAGS_ONLINE);
+}
+
+static void pcpu_online_status(struct xenpf_pcpuinfo *info,
+ struct pcpu *pcpu)
+{
+ if (xen_pcpu_online(info->flags) &&
+ !xen_pcpu_online(pcpu->flags)) {
+ /* the pcpu is onlined */
+ pcpu->flags |= XEN_PCPU_FLAGS_ONLINE;
+ kobject_uevent(&pcpu->dev.kobj, KOBJ_ONLINE);
+ } else if (!xen_pcpu_online(info->flags) &&
+ xen_pcpu_online(pcpu->flags)) {
+ /* The pcpu is offlined */
+ pcpu->flags &= ~XEN_PCPU_FLAGS_ONLINE;
+ kobject_uevent(&pcpu->dev.kobj, KOBJ_OFFLINE);
+ }
+}
+
+static struct pcpu *get_pcpu(uint32_t cpu_id)
+{
+ struct pcpu *pcpu;
+
+ list_for_each_entry(pcpu, &xen_pcpus, list) {
+ if (pcpu->cpu_id == cpu_id)
+ return pcpu;
+ }
+
+ return NULL;
+}
+
+static void pcpu_release(struct device *dev)
+{
+ struct pcpu *pcpu = container_of(dev, struct pcpu, dev);
+
+ list_del(&pcpu->list);
+ kfree(pcpu);
+}
+
+static void unregister_and_remove_pcpu(struct pcpu *pcpu)
+{
+ struct device *dev;
+
+ if (!pcpu)
+ return;
+
+ dev = &pcpu->dev;
+ if (dev->id)
+ device_remove_file(dev, &dev_attr_online);
+
+ /* pcpu remove would be implicitly done */
+ device_unregister(dev);
+}
+
+static int register_pcpu(struct pcpu *pcpu)
+{
+ struct device *dev;
+ int err = -EINVAL;
+
+ if (!pcpu)
+ return err;
+
+ dev = &pcpu->dev;
+ dev->bus = &xen_pcpu_subsys;
+ dev->id = pcpu->cpu_id;
+ dev->release = pcpu_release;
+
+ err = device_register(dev);
+ if (err) {
+ pcpu_release(dev);
+ return err;
+ }
+
+ /*
+ * Xen never offline cpu0 due to several restrictions
+ * and assumptions. This basically doesn't add a sys control
+ * to user, one cannot attempt to offline BSP.
+ */
+ if (dev->id) {
+ err = device_create_file(dev, &dev_attr_online);
+ if (err) {
+ device_unregister(dev);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static struct pcpu *create_and_register_pcpu(struct xenpf_pcpuinfo *info)
+{
+ struct pcpu *pcpu;
+ int err;
+
+ if (info->flags & XEN_PCPU_FLAGS_INVALID)
+ return ERR_PTR(-ENODEV);
+
+ pcpu = kzalloc(sizeof(struct pcpu), GFP_KERNEL);
+ if (!pcpu)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&pcpu->list);
+ pcpu->cpu_id = info->xen_cpuid;
+ pcpu->flags = info->flags;
+
+ /* Need hold on xen_pcpu_lock before pcpu list manipulations */
+ list_add_tail(&pcpu->list, &xen_pcpus);
+
+ err = register_pcpu(pcpu);
+ if (err) {
+ pr_warning(XEN_PCPU "Failed to register pcpu%u\n",
+ info->xen_cpuid);
+ return ERR_PTR(-ENOENT);
+ }
+
+ return pcpu;
+}
+
+/*
+ * Caller should hold the xen_pcpu_lock
+ */
+static int sync_pcpu(uint32_t cpu, uint32_t *max_cpu)
+{
+ int ret;
+ struct pcpu *pcpu = NULL;
+ struct xenpf_pcpuinfo *info;
+ struct xen_platform_op op = {
+ .cmd = XENPF_get_cpuinfo,
+ .interface_version = XENPF_INTERFACE_VERSION,
+ .u.pcpu_info.xen_cpuid = cpu,
+ };
+
+ ret = HYPERVISOR_dom0_op(&op);
+ if (ret)
+ return ret;
+
+ info = &op.u.pcpu_info;
+ if (max_cpu)
+ *max_cpu = info->max_present;
+
+ pcpu = get_pcpu(cpu);
+
+ /*
+ * Only those at cpu present map has its sys interface.
+ */
+ if (info->flags & XEN_PCPU_FLAGS_INVALID) {
+ if (pcpu)
+ unregister_and_remove_pcpu(pcpu);
+ return 0;
+ }
+
+ if (!pcpu) {
+ pcpu = create_and_register_pcpu(info);
+ if (IS_ERR_OR_NULL(pcpu))
+ return -ENODEV;
+ } else
+ pcpu_online_status(info, pcpu);
+
+ return 0;
+}
+
+/*
+ * Sync dom0's pcpu information with xen hypervisor's
+ */
+static int xen_sync_pcpus(void)
+{
+ /*
+ * Boot cpu always have cpu_id 0 in xen
+ */
+ uint32_t cpu = 0, max_cpu = 0;
+ int err = 0;
+ struct pcpu *pcpu, *tmp;
+
+ mutex_lock(&xen_pcpu_lock);
+
+ while (!err && (cpu <= max_cpu)) {
+ err = sync_pcpu(cpu, &max_cpu);
+ cpu++;
+ }
+
+ if (err)
+ list_for_each_entry_safe(pcpu, tmp, &xen_pcpus, list)
+ unregister_and_remove_pcpu(pcpu);
+
+ mutex_unlock(&xen_pcpu_lock);
+
+ return err;
+}
+
+static void xen_pcpu_work_fn(struct work_struct *work)
+{
+ xen_sync_pcpus();
+}
+static DECLARE_WORK(xen_pcpu_work, xen_pcpu_work_fn);
+
+static irqreturn_t xen_pcpu_interrupt(int irq, void *dev_id)
+{
+ schedule_work(&xen_pcpu_work);
+ return IRQ_HANDLED;
+}
+
+static int __init xen_pcpu_init(void)
+{
+ int irq, ret;
+
+ if (!xen_initial_domain())
+ return -ENODEV;
+
+ irq = bind_virq_to_irqhandler(VIRQ_PCPU_STATE, 0,
+ xen_pcpu_interrupt, 0,
+ "xen-pcpu", NULL);
+ if (irq < 0) {
+ pr_warning(XEN_PCPU "Failed to bind pcpu virq\n");
+ return irq;
+ }
+
+ ret = subsys_system_register(&xen_pcpu_subsys, NULL);
+ if (ret) {
+ pr_warning(XEN_PCPU "Failed to register pcpu subsys\n");
+ goto err1;
+ }
+
+ ret = xen_sync_pcpus();
+ if (ret) {
+ pr_warning(XEN_PCPU "Failed to sync pcpu info\n");
+ goto err2;
+ }
+
+ return 0;
+
+err2:
+ bus_unregister(&xen_pcpu_subsys);
+err1:
+ unbind_from_irqhandler(irq, NULL);
+ return ret;
+}
+arch_initcall(xen_pcpu_init);
diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index 2389e58..d4c50d6 100644
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -101,6 +101,19 @@ static int platform_pci_resume(struct pci_dev *pdev)
return 0;
}
+static void __devinit prepare_shared_info(void)
+{
+#ifdef CONFIG_KEXEC
+ unsigned long addr;
+ struct shared_info *hvm_shared_info;
+
+ addr = alloc_xen_mmio(PAGE_SIZE);
+ hvm_shared_info = ioremap(addr, PAGE_SIZE);
+ memset(hvm_shared_info, 0, PAGE_SIZE);
+ xen_hvm_prepare_kexec(hvm_shared_info, addr >> PAGE_SHIFT);
+#endif
+}
+
static int __devinit platform_pci_init(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -109,6 +122,9 @@ static int __devinit platform_pci_init(struct pci_dev *pdev,
long mmio_addr, mmio_len;
unsigned int max_nr_gframes;
+ if (!xen_domain())
+ return -ENODEV;
+
i = pci_enable_device(pdev);
if (i)
return i;
@@ -135,6 +151,8 @@ static int __devinit platform_pci_init(struct pci_dev *pdev,
platform_mmio = mmio_addr;
platform_mmiolen = mmio_len;
+ prepare_shared_info();
+
if (!xen_have_vector_callback) {
ret = xen_allocate_irq(pdev);
if (ret) {
diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index 7ff2569..b590ee0 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -520,15 +520,18 @@ static int __init xen_acpi_processor_init(void)
if (!pr_backup) {
pr_backup = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
- memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
+ if (pr_backup)
+ memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
}
(void)upload_pm_data(_pr);
}
rc = check_acpi_ids(pr_backup);
- if (rc)
- goto err_unregister;
kfree(pr_backup);
+ pr_backup = NULL;
+
+ if (rc)
+ goto err_unregister;
return 0;
err_unregister:
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index d1c217b..bce15cf 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -618,6 +618,23 @@ static struct xenbus_watch *find_watch(const char *token)
return NULL;
}
+static void xs_reset_watches(void)
+{
+ int err, supported = 0;
+
+ if (!xen_hvm_domain())
+ return;
+
+ err = xenbus_scanf(XBT_NIL, "control",
+ "platform-feature-xs_reset_watches", "%d", &supported);
+ if (err != 1 || !supported)
+ return;
+
+ err = xs_error(xs_single(XBT_NIL, XS_RESET_WATCHES, "", NULL));
+ if (err && err != -EEXIST)
+ printk(KERN_WARNING "xs_reset_watches failed: %d\n", err);
+}
+
/* Register callback to watch this node. */
int register_xenbus_watch(struct xenbus_watch *watch)
{
@@ -900,5 +917,8 @@ int xs_init(void)
if (IS_ERR(task))
return PTR_ERR(task);
+ /* shutdown watches for kexec boot */
+ xs_reset_watches();
+
return 0;
}
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 0549d211..e0deeb2 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -35,6 +35,7 @@
#define MPT_MINOR 220
#define MPT2SAS_MINOR 221
#define UINPUT_MINOR 223
+#define MISC_MCELOG_MINOR 227
#define HPET_MINOR 228
#define FUSE_MINOR 229
#define KVM_MINOR 232
diff --git a/include/xen/events.h b/include/xen/events.h
index 04399b2..9c641de 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -58,6 +58,8 @@ void notify_remote_via_irq(int irq);
void xen_irq_resume(void);
+void xen_hvm_prepare_kexec(struct shared_info *sip, unsigned long pfn);
+
/* Clear an irq's pending state, in preparation for polling on it */
void xen_clear_irq_pending(int irq);
void xen_set_irq_pending(int irq);
diff --git a/include/xen/interface/io/xs_wire.h b/include/xen/interface/io/xs_wire.h
index 7cdfca2..794deb0 100644
--- a/include/xen/interface/io/xs_wire.h
+++ b/include/xen/interface/io/xs_wire.h
@@ -29,7 +29,8 @@ enum xsd_sockmsg_type
XS_IS_DOMAIN_INTRODUCED,
XS_RESUME,
XS_SET_TARGET,
- XS_RESTRICT
+ XS_RESTRICT,
+ XS_RESET_WATCHES,
};
#define XS_WRITE_NONE "NONE"
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index 486653f..61fa661 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -314,6 +314,13 @@ struct xenpf_pcpuinfo {
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_pcpuinfo);
+#define XENPF_cpu_online 56
+#define XENPF_cpu_offline 57
+struct xenpf_cpu_ol {
+ uint32_t cpuid;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xenpf_cpu_ol);
+
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -330,6 +337,7 @@ struct xen_platform_op {
struct xenpf_getidletime getidletime;
struct xenpf_set_processor_pminfo set_pminfo;
struct xenpf_pcpuinfo pcpu_info;
+ struct xenpf_cpu_ol cpu_ol;
uint8_t pad[128];
} u;
};
diff --git a/include/xen/interface/xen-mca.h b/include/xen/interface/xen-mca.h
new file mode 100644
index 0000000..73a4ea7
--- /dev/null
+++ b/include/xen/interface/xen-mca.h
@@ -0,0 +1,385 @@
+/******************************************************************************
+ * arch-x86/mca.h
+ * Guest OS machine check interface to x86 Xen.
+ *
+ * Contributed by Advanced Micro Devices, Inc.
+ * Author: Christoph Egger <Christoph.Egger@amd.com>
+ *
+ * Updated by Intel Corporation
+ * Author: Liu, Jinsong <jinsong.liu@intel.com>
+ *
+ * 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.
+ */
+
+#ifndef __XEN_PUBLIC_ARCH_X86_MCA_H__
+#define __XEN_PUBLIC_ARCH_X86_MCA_H__
+
+/* Hypercall */
+#define __HYPERVISOR_mca __HYPERVISOR_arch_0
+
+#define XEN_MCA_INTERFACE_VERSION 0x01ecc003
+
+/* IN: Dom0 calls hypercall to retrieve nonurgent error log entry */
+#define XEN_MC_NONURGENT 0x1
+/* IN: Dom0 calls hypercall to retrieve urgent error log entry */
+#define XEN_MC_URGENT 0x2
+/* IN: Dom0 acknowledges previosly-fetched error log entry */
+#define XEN_MC_ACK 0x4
+
+/* OUT: All is ok */
+#define XEN_MC_OK 0x0
+/* OUT: Domain could not fetch data. */
+#define XEN_MC_FETCHFAILED 0x1
+/* OUT: There was no machine check data to fetch. */
+#define XEN_MC_NODATA 0x2
+
+#ifndef __ASSEMBLY__
+/* vIRQ injected to Dom0 */
+#define VIRQ_MCA VIRQ_ARCH_0
+
+/*
+ * mc_info entry types
+ * mca machine check info are recorded in mc_info entries.
+ * when fetch mca info, it can use MC_TYPE_... to distinguish
+ * different mca info.
+ */
+#define MC_TYPE_GLOBAL 0
+#define MC_TYPE_BANK 1
+#define MC_TYPE_EXTENDED 2
+#define MC_TYPE_RECOVERY 3
+
+struct mcinfo_common {
+ uint16_t type; /* structure type */
+ uint16_t size; /* size of this struct in bytes */
+};
+
+#define MC_FLAG_CORRECTABLE (1 << 0)
+#define MC_FLAG_UNCORRECTABLE (1 << 1)
+#define MC_FLAG_RECOVERABLE (1 << 2)
+#define MC_FLAG_POLLED (1 << 3)
+#define MC_FLAG_RESET (1 << 4)
+#define MC_FLAG_CMCI (1 << 5)
+#define MC_FLAG_MCE (1 << 6)
+
+/* contains x86 global mc information */
+struct mcinfo_global {
+ struct mcinfo_common common;
+
+ uint16_t mc_domid; /* running domain at the time in error */
+ uint16_t mc_vcpuid; /* virtual cpu scheduled for mc_domid */
+ uint32_t mc_socketid; /* physical socket of the physical core */
+ uint16_t mc_coreid; /* physical impacted core */
+ uint16_t mc_core_threadid; /* core thread of physical core */
+ uint32_t mc_apicid;
+ uint32_t mc_flags;
+ uint64_t mc_gstatus; /* global status */
+};
+
+/* contains x86 bank mc information */
+struct mcinfo_bank {
+ struct mcinfo_common common;
+
+ uint16_t mc_bank; /* bank nr */
+ uint16_t mc_domid; /* domain referenced by mc_addr if valid */
+ uint64_t mc_status; /* bank status */
+ uint64_t mc_addr; /* bank address */
+ uint64_t mc_misc;
+ uint64_t mc_ctrl2;
+ uint64_t mc_tsc;
+};
+
+struct mcinfo_msr {
+ uint64_t reg; /* MSR */
+ uint64_t value; /* MSR value */
+};
+
+/* contains mc information from other or additional mc MSRs */
+struct mcinfo_extended {
+ struct mcinfo_common common;
+ uint32_t mc_msrs; /* Number of msr with valid values. */
+ /*
+ * Currently Intel extended MSR (32/64) include all gp registers
+ * and E(R)FLAGS, E(R)IP, E(R)MISC, up to 11/19 of them might be
+ * useful at present. So expand this array to 16/32 to leave room.
+ */
+ struct mcinfo_msr mc_msr[sizeof(void *) * 4];
+};
+
+/* Recovery Action flags. Giving recovery result information to DOM0 */
+
+/* Xen takes successful recovery action, the error is recovered */
+#define REC_ACTION_RECOVERED (0x1 << 0)
+/* No action is performed by XEN */
+#define REC_ACTION_NONE (0x1 << 1)
+/* It's possible DOM0 might take action ownership in some case */
+#define REC_ACTION_NEED_RESET (0x1 << 2)
+
+/*
+ * Different Recovery Action types, if the action is performed successfully,
+ * REC_ACTION_RECOVERED flag will be returned.
+ */
+
+/* Page Offline Action */
+#define MC_ACTION_PAGE_OFFLINE (0x1 << 0)
+/* CPU offline Action */
+#define MC_ACTION_CPU_OFFLINE (0x1 << 1)
+/* L3 cache disable Action */
+#define MC_ACTION_CACHE_SHRINK (0x1 << 2)
+
+/*
+ * Below interface used between XEN/DOM0 for passing XEN's recovery action
+ * information to DOM0.
+ */
+struct page_offline_action {
+ /* Params for passing the offlined page number to DOM0 */
+ uint64_t mfn;
+ uint64_t status;
+};
+
+struct cpu_offline_action {
+ /* Params for passing the identity of the offlined CPU to DOM0 */
+ uint32_t mc_socketid;
+ uint16_t mc_coreid;
+ uint16_t mc_core_threadid;
+};
+
+#define MAX_UNION_SIZE 16
+struct mcinfo_recovery {
+ struct mcinfo_common common;
+ uint16_t mc_bank; /* bank nr */
+ uint8_t action_flags;
+ uint8_t action_types;
+ union {
+ struct page_offline_action page_retire;
+ struct cpu_offline_action cpu_offline;
+ uint8_t pad[MAX_UNION_SIZE];
+ } action_info;
+};
+
+
+#define MCINFO_MAXSIZE 768
+struct mc_info {
+ /* Number of mcinfo_* entries in mi_data */
+ uint32_t mi_nentries;
+ uint32_t flags;
+ uint64_t mi_data[(MCINFO_MAXSIZE - 1) / 8];
+};
+DEFINE_GUEST_HANDLE_STRUCT(mc_info);
+
+#define __MC_MSR_ARRAYSIZE 8
+#define __MC_MSR_MCGCAP 0
+#define __MC_NMSRS 1
+#define MC_NCAPS 7
+struct mcinfo_logical_cpu {
+ uint32_t mc_cpunr;
+ uint32_t mc_chipid;
+ uint16_t mc_coreid;
+ uint16_t mc_threadid;
+ uint32_t mc_apicid;
+ uint32_t mc_clusterid;
+ uint32_t mc_ncores;
+ uint32_t mc_ncores_active;
+ uint32_t mc_nthreads;
+ uint32_t mc_cpuid_level;
+ uint32_t mc_family;
+ uint32_t mc_vendor;
+ uint32_t mc_model;
+ uint32_t mc_step;
+ char mc_vendorid[16];
+ char mc_brandid[64];
+ uint32_t mc_cpu_caps[MC_NCAPS];
+ uint32_t mc_cache_size;
+ uint32_t mc_cache_alignment;
+ uint32_t mc_nmsrvals;
+ struct mcinfo_msr mc_msrvalues[__MC_MSR_ARRAYSIZE];
+};
+DEFINE_GUEST_HANDLE_STRUCT(mcinfo_logical_cpu);
+
+/*
+ * Prototype:
+ * uint32_t x86_mcinfo_nentries(struct mc_info *mi);
+ */
+#define x86_mcinfo_nentries(_mi) \
+ ((_mi)->mi_nentries)
+/*
+ * Prototype:
+ * struct mcinfo_common *x86_mcinfo_first(struct mc_info *mi);
+ */
+#define x86_mcinfo_first(_mi) \
+ ((struct mcinfo_common *)(_mi)->mi_data)
+/*
+ * Prototype:
+ * struct mcinfo_common *x86_mcinfo_next(struct mcinfo_common *mic);
+ */
+#define x86_mcinfo_next(_mic) \
+ ((struct mcinfo_common *)((uint8_t *)(_mic) + (_mic)->size))
+
+/*
+ * Prototype:
+ * void x86_mcinfo_lookup(void *ret, struct mc_info *mi, uint16_t type);
+ */
+static inline void x86_mcinfo_lookup(struct mcinfo_common **ret,
+ struct mc_info *mi, uint16_t type)
+{
+ uint32_t i;
+ struct mcinfo_common *mic;
+ bool found = 0;
+
+ if (!ret || !mi)
+ return;
+
+ mic = x86_mcinfo_first(mi);
+ for (i = 0; i < x86_mcinfo_nentries(mi); i++) {
+ if (mic->type == type) {
+ found = 1;
+ break;
+ }
+ mic = x86_mcinfo_next(mic);
+ }
+
+ *ret = found ? mic : NULL;
+}
+
+/*
+ * Fetch machine check data from hypervisor.
+ */
+#define XEN_MC_fetch 1
+struct xen_mc_fetch {
+ /*
+ * IN: XEN_MC_NONURGENT, XEN_MC_URGENT,
+ * XEN_MC_ACK if ack'king an earlier fetch
+ * OUT: XEN_MC_OK, XEN_MC_FETCHAILED, XEN_MC_NODATA
+ */
+ uint32_t flags;
+ uint32_t _pad0;
+ /* OUT: id for ack, IN: id we are ack'ing */
+ uint64_t fetch_id;
+
+ /* OUT variables. */
+ GUEST_HANDLE(mc_info) data;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xen_mc_fetch);
+
+
+/*
+ * This tells the hypervisor to notify a DomU about the machine check error
+ */
+#define XEN_MC_notifydomain 2
+struct xen_mc_notifydomain {
+ /* IN variables */
+ uint16_t mc_domid; /* The unprivileged domain to notify */
+ uint16_t mc_vcpuid; /* The vcpu in mc_domid to notify */
+
+ /* IN/OUT variables */
+ uint32_t flags;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xen_mc_notifydomain);
+
+#define XEN_MC_physcpuinfo 3
+struct xen_mc_physcpuinfo {
+ /* IN/OUT */
+ uint32_t ncpus;
+ uint32_t _pad0;
+ /* OUT */
+ GUEST_HANDLE(mcinfo_logical_cpu) info;
+};
+
+#define XEN_MC_msrinject 4
+#define MC_MSRINJ_MAXMSRS 8
+struct xen_mc_msrinject {
+ /* IN */
+ uint32_t mcinj_cpunr; /* target processor id */
+ uint32_t mcinj_flags; /* see MC_MSRINJ_F_* below */
+ uint32_t mcinj_count; /* 0 .. count-1 in array are valid */
+ uint32_t _pad0;
+ struct mcinfo_msr mcinj_msr[MC_MSRINJ_MAXMSRS];
+};
+
+/* Flags for mcinj_flags above; bits 16-31 are reserved */
+#define MC_MSRINJ_F_INTERPOSE 0x1
+
+#define XEN_MC_mceinject 5
+struct xen_mc_mceinject {
+ unsigned int mceinj_cpunr; /* target processor id */
+};
+
+struct xen_mc {
+ uint32_t cmd;
+ uint32_t interface_version; /* XEN_MCA_INTERFACE_VERSION */
+ union {
+ struct xen_mc_fetch mc_fetch;
+ struct xen_mc_notifydomain mc_notifydomain;
+ struct xen_mc_physcpuinfo mc_physcpuinfo;
+ struct xen_mc_msrinject mc_msrinject;
+ struct xen_mc_mceinject mc_mceinject;
+ } u;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xen_mc);
+
+/* Fields are zero when not available */
+struct xen_mce {
+ __u64 status;
+ __u64 misc;
+ __u64 addr;
+ __u64 mcgstatus;
+ __u64 ip;
+ __u64 tsc; /* cpu time stamp counter */
+ __u64 time; /* wall time_t when error was detected */
+ __u8 cpuvendor; /* cpu vendor as encoded in system.h */
+ __u8 inject_flags; /* software inject flags */
+ __u16 pad;
+ __u32 cpuid; /* CPUID 1 EAX */
+ __u8 cs; /* code segment */
+ __u8 bank; /* machine check bank */
+ __u8 cpu; /* cpu number; obsolete; use extcpu now */
+ __u8 finished; /* entry is valid */
+ __u32 extcpu; /* linux cpu number that detected the error */
+ __u32 socketid; /* CPU socket ID */
+ __u32 apicid; /* CPU initial apic ID */
+ __u64 mcgcap; /* MCGCAP MSR: machine check capabilities of CPU */
+};
+
+/*
+ * This structure contains all data related to the MCE log. Also
+ * carries a signature to make it easier to find from external
+ * debugging tools. Each entry is only valid when its finished flag
+ * is set.
+ */
+
+#define XEN_MCE_LOG_LEN 32
+
+struct xen_mce_log {
+ char signature[12]; /* "MACHINECHECK" */
+ unsigned len; /* = XEN_MCE_LOG_LEN */
+ unsigned next;
+ unsigned flags;
+ unsigned recordlen; /* length of struct xen_mce */
+ struct xen_mce entry[XEN_MCE_LOG_LEN];
+};
+
+#define XEN_MCE_OVERFLOW 0 /* bit 0 in flags means overflow */
+
+#define XEN_MCE_LOG_SIGNATURE "MACHINECHECK"
+
+#define MCE_GET_RECORD_LEN _IOR('M', 1, int)
+#define MCE_GET_LOG_LEN _IOR('M', 2, int)
+#define MCE_GETCLEAR_FLAGS _IOR('M', 3, int)
+
+#endif /* __ASSEMBLY__ */
+#endif /* __XEN_PUBLIC_ARCH_X86_MCA_H__ */
diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index a890804..0801468 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -80,6 +80,7 @@
#define VIRQ_CONSOLE 2 /* (DOM0) Bytes received on emergency console. */
#define VIRQ_DOM_EXC 3 /* (DOM0) Exceptional event for some domain. */
#define VIRQ_DEBUGGER 6 /* (DOM0) A domain has paused for debugging. */
+#define VIRQ_PCPU_STATE 9 /* (DOM0) PCPU state changed */
/* Architecture-specific VIRQ definitions. */
#define VIRQ_ARCH_0 16
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