Merge tag 'stable/for-linus-3.6-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

Pull Xen update from Konrad Rzeszutek Wilk:
 "Features:
   * Performance improvement to lower the amount of traps the hypervisor
     has to do 32-bit guests.  Mainly for setting PTE entries and
     updating TLS descriptors.
   * MCE polling driver to collect hypervisor MCE buffer and present
     them to /dev/mcelog.
   * Physical CPU online/offline support.  When an privileged guest is
     booted it is present with virtual CPUs, which might have an 1:1 to
     physical CPUs but usually don't.  This provides mechanism to
     offline/online physical CPUs.
  Bug-fixes for:
   * Coverity found fixes in the console and ACPI processor driver.
   * PVonHVM kexec fixes along with some cleanups.
   * Pages that fall within E820 gaps and non-RAM regions (and had been
     released to hypervisor) would be populated back, but potentially in
     non-RAM regions."

* tag 'stable/for-linus-3.6-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen: populate correct number of pages when across mem boundary (v2)
  xen PVonHVM: move shared_info to MMIO before kexec
  xen: simplify init_hvm_pv_info
  xen: remove cast from HYPERVISOR_shared_info assignment
  xen: enable platform-pci only in a Xen guest
  xen/pv-on-hvm kexec: shutdown watches from old kernel
  xen/x86: avoid updating TLS descriptors if they haven't changed
  xen/x86: add desc_equal() to compare GDT descriptors
  xen/mm: zero PTEs for non-present MFNs in the initial page table
  xen/mm: do direct hypercall in xen_set_pte() if batching is unavailable
  xen/hvc: Fix up checks when the info is allocated.
  xen/acpi: Fix potential memory leak.
  xen/mce: add .poll method for mcelog device driver
  xen/mce: schedule a workqueue to avoid sleep in atomic context
  xen/pcpu: Xen physical cpus online/offline sys interface
  xen/mce: Register native mce handler as vMCE bounce back point
  x86, MCE, AMD: Adjust initcall sequence for xen
  xen/mce: Add mcelog support for Xen platform

6 files changed, 399 insertions, 1 deletions

diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 0549d2115507..e0deeb2cc939 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 04399b28e821..9c641deb65d2 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 7cdfca24eafb..794deb07eb53 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 486653f0dd8f..61fa66160983 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 000000000000..73a4ea714d93
--- /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 a890804945e3..0801468f9abe 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