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KVM: 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@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Andre Przywara 2009-07-02 15:04:14 +02:00 committed by Avi Kivity
parent f691fe1da7
commit f7c6d14003
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kvm/x86.c
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@ -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: