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authorAndre Przywara <andre.przywara@amd.com>2009-07-02 15:04:14 +0200
committerAvi Kivity <avi@redhat.com>2009-09-10 08:33:10 +0300
commitf7c6d140032ae7e80df36d350c6edc41f92b2f94 (patch)
tree4d69b6bc63e25b2e6599575c7377af71f82ea58d
parentf691fe1da7e2715137d21ae5a80bec64db4625db (diff)
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: Andre Przywara <andre.przywara@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--arch/x86/kvm/x86.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0e74d98641a..95fa45c0f16 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: