[Xen-changelog] [xen master] x86/vmce: enable injecting LMCE to guest on Intel host

[patchbot@xxxxxxx]

commit 6954fcd55d6d0271151d41ae58310a93cbf94744
Author:     Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
AuthorDate: Fri Jul 14 12:44:01 2017 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jul 14 12:44:01 2017 +0200

    x86/vmce: enable injecting LMCE to guest on Intel host
    
    Inject LMCE to guest if the host MCE is LMCE and the affected vcpu is
    known. Otherwise, broadcast MCE to all vcpus on Intel host.
    
    Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpu/mcheck/mcaction.c | 23 ++++++++++++++++-------
 xen/arch/x86/cpu/mcheck/vmce.c     | 11 ++++++++++-
 xen/arch/x86/cpu/mcheck/vmce.h     |  2 +-
 3 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/xen/arch/x86/cpu/mcheck/mcaction.c 
b/xen/arch/x86/cpu/mcheck/mcaction.c
index ca17d22..f959bed 100644
--- a/xen/arch/x86/cpu/mcheck/mcaction.c
+++ b/xen/arch/x86/cpu/mcheck/mcaction.c
@@ -44,6 +44,7 @@ mc_memerr_dhandler(struct mca_binfo *binfo,
     unsigned long mfn, gfn;
     uint32_t status;
     int vmce_vcpuid;
+    unsigned int mc_vcpuid;
 
     if (!mc_check_addr(bank->mc_status, bank->mc_misc, MC_ADDR_PHYSICAL)) {
         dprintk(XENLOG_WARNING,
@@ -88,18 +89,26 @@ mc_memerr_dhandler(struct mca_binfo *binfo,
                     goto vmce_failed;
                 }
 
-                if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL ||
-                    global->mc_vcpuid == XEN_MC_VCPUID_INVALID)
+                mc_vcpuid = global->mc_vcpuid;
+                if (mc_vcpuid == XEN_MC_VCPUID_INVALID ||
+                    /*
+                     * Because MC# may happen asynchronously with the actual
+                     * operation that triggers the error, the domain ID as
+                     * well as the vCPU ID collected in 'global' at MC# are
+                     * not always precise. In that case, fallback to broadcast.
+                     */
+                    global->mc_domid != bank->mc_domid ||
+                    (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+                     (!(global->mc_gstatus & MCG_STATUS_LMCE) ||
+                      !(d->vcpu[mc_vcpuid]->arch.vmce.mcg_ext_ctl &
+                        MCG_EXT_CTL_LMCE_EN))))
                     vmce_vcpuid = VMCE_INJECT_BROADCAST;
                 else
-                    vmce_vcpuid = global->mc_vcpuid;
+                    vmce_vcpuid = mc_vcpuid;
 
                 bank->mc_addr = gfn << PAGE_SHIFT |
                   (bank->mc_addr & (PAGE_SIZE -1 ));
-                /* TODO: support injecting LMCE */
-                if (fill_vmsr_data(bank, d,
-                                   global->mc_gstatus & ~MCG_STATUS_LMCE,
-                                   vmce_vcpuid == VMCE_INJECT_BROADCAST))
+                if (fill_vmsr_data(bank, d, global->mc_gstatus, vmce_vcpuid))
                 {
                     mce_printk(MCE_QUIET, "Fill vMCE# data for DOM%d "
                       "failed\n", bank->mc_domid);
diff --git a/xen/arch/x86/cpu/mcheck/vmce.c b/xen/arch/x86/cpu/mcheck/vmce.c
index 060e2d0..e2b3c5b 100644
--- a/xen/arch/x86/cpu/mcheck/vmce.c
+++ b/xen/arch/x86/cpu/mcheck/vmce.c
@@ -465,14 +465,23 @@ static int vcpu_fill_mc_msrs(struct vcpu *v, uint64_t 
mcg_status,
 }
 
 int fill_vmsr_data(struct mcinfo_bank *mc_bank, struct domain *d,
-                   uint64_t gstatus, bool broadcast)
+                   uint64_t gstatus, int vmce_vcpuid)
 {
     struct vcpu *v = d->vcpu[0];
+    bool broadcast = (vmce_vcpuid == VMCE_INJECT_BROADCAST);
     int ret, err;
 
     if ( mc_bank->mc_domid == DOMID_INVALID )
         return -EINVAL;
 
+    if ( broadcast )
+        gstatus &= ~MCG_STATUS_LMCE;
+    else if ( gstatus & MCG_STATUS_LMCE )
+    {
+        ASSERT(vmce_vcpuid >= 0 && vmce_vcpuid < d->max_vcpus);
+        v = d->vcpu[vmce_vcpuid];
+    }
+
     /*
      * vMCE with the actual error information is injected to vCPU0,
      * and, if broadcast is required, we choose to inject less severe
diff --git a/xen/arch/x86/cpu/mcheck/vmce.h b/xen/arch/x86/cpu/mcheck/vmce.h
index 74f6381..2797e00 100644
--- a/xen/arch/x86/cpu/mcheck/vmce.h
+++ b/xen/arch/x86/cpu/mcheck/vmce.h
@@ -17,7 +17,7 @@ int vmce_amd_rdmsr(const struct vcpu *, uint32_t msr, 
uint64_t *val);
 int vmce_amd_wrmsr(struct vcpu *, uint32_t msr, uint64_t val);
 
 int fill_vmsr_data(struct mcinfo_bank *mc_bank, struct domain *d,
-                   uint64_t gstatus, bool broadcast);
+                   uint64_t gstatus, int vmce_vcpuid);
 
 #define VMCE_INJECT_BROADCAST (-1)
 int inject_vmce(struct domain *d, int vcpu);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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