KVM: Ignore PCI ECS I/O enablement

Linux guests will try to enable access to the extended PCI config space
via the I/O ports 0xCF8/0xCFC on AMD Fam10h CPU. Since we (currently?)
don't use ECS, simply ignore write and read attempts.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 96f0ae7d97b66c6353a33644fb9818eb60252b16..af40e23df25108de08315d86ba1c0483804a0f78 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -844,6 +844,8 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
                        return 1;
                }
                break;
+       case MSR_AMD64_NB_CFG:
+               break;
        case MSR_IA32_DEBUGCTLMSR:
                if (!data) {
                        /* We support the non-activated case already */
@@ -1049,6 +1051,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
        case MSR_P6_EVNTSEL1:
        case MSR_K7_EVNTSEL0:
        case MSR_K8_INT_PENDING_MSG:
+       case MSR_AMD64_NB_CFG:
                data = 0;
                break;
        case MSR_MTRRcap: