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Commit f7c6d140 authored by Andre Przywara's avatar Andre Przywara Committed by Avi Kivity
Browse files

KVM: fix MMIO_CONF_BASE MSR access 



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: default avatarAndre Przywara <andre.przywara@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent f691fe1d

arch/x86/kvm/x86.c

+8 −0
Original line number Diff line number Diff line
@@ -844,6 +844,13 @@ 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:
@@ -1055,6 +1062,7 @@ 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: