From: Andre Przywara <andre.przywara@xxxxxxx>
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>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0e74d98..95fa45c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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:
--
1.6.4.1
--
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