[PATCH] Ignore DEBUGCTL MSRs

[Alexander Graf <agraf@suse.de>]

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Netware writes and reads to the DEBUGCTL and LAST*IP MSRs without 
further checks and is really confused to receive a #GP during that. To 
make it happy we should just make them stubs, which is exactly what SVM 
already does.

To support VMX too, I put these in the generic code. Maybe the SVM code 
could be cleaned up to use generic code too.

Signed-off-by: Alexander Graf <agraf@suse.de>



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diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fc0721e..02f8490 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -609,6 +609,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 		pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
 			__func__, data);
 		break;
+	case MSR_IA32_DEBUGCTLMSR:
+	case MSR_IA32_LASTBRANCHFROMIP:
+	case MSR_IA32_LASTBRANCHTOIP:
+	case MSR_IA32_LASTINTFROMIP:
+	case MSR_IA32_LASTINTTOIP:
 	case MSR_IA32_UCODE_REV:
 	case MSR_IA32_UCODE_WRITE:
 		break;
@@ -705,6 +710,11 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_IA32_MC0_MISC+16:
 	case MSR_IA32_UCODE_REV:
 	case MSR_IA32_EBL_CR_POWERON:
+	case MSR_IA32_DEBUGCTLMSR:
+	case MSR_IA32_LASTBRANCHFROMIP:
+	case MSR_IA32_LASTBRANCHTOIP:
+	case MSR_IA32_LASTINTFROMIP:
+	case MSR_IA32_LASTINTTOIP:
 		data = 0;
 		break;
 	case MSR_MTRRcap: