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    Subject[PATCH 02/46] KVM: Ignore PCI ECS I/O enablement
    Date
    From: Andre Przywara <andre.przywara@amd.com>

    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>
    ---
    arch/x86/kvm/x86.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index 96f0ae7..af40e23 100644
    --- 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:
    --
    1.6.4.1


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