[PATCH] fix MMIO_CONF_BASE MSR access

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 Some Windows versions check whether the BIOS has setup MMI/O for
 config space accesses on AMD Fam10h CPUs, we say "no" by returning 0 on
 reads and only allow disabling of MMI/O CfgSpace setup by igoring "0" writes.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 arch/x86/kvm/x86.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

This obsoletes the patch: "fix AMD Fam10h unhandled MSRs" from yesterday,
since part of it has already been applied with an older patch. This
contains only the remaining part.

Thanks and Regards,
Andre.

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6263991..60b2527 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -846,6 +846,13 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 			return 1;
 		}
 		break;
+	case MSR_FAM10H_MMIO_CONF_BASE:
+		if (data != 0) {
+			pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
+				"0x%llx\n", data);
+			return 1;
+		}
+		break;
 	case MSR_AMD64_NB_CFG:
 		break;
 	case MSR_IA32_DEBUGCTLMSR:
@@ -1054,6 +1061,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_K7_EVNTSEL0:
 	case MSR_K8_INT_PENDING_MSG:
 	case MSR_AMD64_NB_CFG:
+	case MSR_FAM10H_MMIO_CONF_BASE:
 		data = 0;
 		break;
 	case MSR_MTRRcap:
-- 
1.6.1.3


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