Il 26/06/2014 14:22, Matthias Lange ha scritto:
Linux' AMD MCE code tries to read from the MC4_MISC1 (0xc0000408) MSR. Because
this read is not virtualized within KVM, a GPE is injected into the guest.
This patch handles guest reads from MC4_MISC and returns 0 to the guest.
Signed-off-by: Matthias Lange <[email protected]>
---
arch/x86/kvm/x86.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 24d70d4..d5a305b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2530,6 +2530,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr,
u64 *pdata)
return 1;
data = vcpu->arch.osvw.status;
break;
+ case 0xc0000408: /* MC4_MISC1 */
+ data = 0;
+ break;
default:
if (kvm_pmu_msr(vcpu, msr))
return kvm_pmu_get_msr(vcpu, msr, pdata);
Why don't you have to do the same with MC4_MISC0?
Is your kernel compiled with or without CONFIG_PARAVIRT? Paravirt does
.read_msr = native_read_msr_safe,
.write_msr = native_write_msr_safe,
so you shouldn't get these #GP exceptions.
Paolo
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