KVM: VMX: enable guest access to LMCE related MSRs
On Intel platforms, this patch adds LMCE to KVM MCE supported
capabilities and handles guest access to LMCE related MSRs.
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
[Haozhong: macro KVM_MCE_CAP_SUPPORTED => variable kvm_mce_cap_supported
Only enable LMCE on Intel platform
Check MSR_IA32_FEATURE_CONTROL when handling guest
access to MSR_IA32_MCG_EXT_CTL]
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2992196..0a42fc7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -70,7 +70,8 @@
#define MAX_IO_MSRS 256
#define KVM_MAX_MCE_BANKS 32
-#define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
+u64 __read_mostly kvm_mce_cap_supported = MCG_CTL_P | MCG_SER_P;
+EXPORT_SYMBOL_GPL(kvm_mce_cap_supported);
#define emul_to_vcpu(ctxt) \
container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
@@ -984,6 +985,7 @@
MSR_IA32_MISC_ENABLE,
MSR_IA32_MCG_STATUS,
MSR_IA32_MCG_CTL,
+ MSR_IA32_MCG_EXT_CTL,
MSR_IA32_SMBASE,
};
@@ -2685,11 +2687,9 @@
break;
}
case KVM_X86_GET_MCE_CAP_SUPPORTED: {
- u64 mce_cap;
-
- mce_cap = KVM_MCE_CAP_SUPPORTED;
r = -EFAULT;
- if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
+ if (copy_to_user(argp, &kvm_mce_cap_supported,
+ sizeof(kvm_mce_cap_supported)))
goto out;
r = 0;
break;
@@ -2872,7 +2872,7 @@
r = -EINVAL;
if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
goto out;
- if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
+ if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000))
goto out;
r = 0;
vcpu->arch.mcg_cap = mcg_cap;
@@ -2882,6 +2882,9 @@
/* Init IA32_MCi_CTL to all 1s */
for (bank = 0; bank < bank_num; bank++)
vcpu->arch.mce_banks[bank*4] = ~(u64)0;
+
+ if (kvm_x86_ops->setup_mce)
+ kvm_x86_ops->setup_mce(vcpu);
out:
return r;
}