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    Subject[PATCH 13/37] KVM: VMX: don't clobber segment AR if emulating invalid state
    Date
    The ususable bit is important for determining state validity; don't
    clobber it.

    Signed-off-by: Avi Kivity <avi@redhat.com>
    ---
    arch/x86/kvm/vmx.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
    index be94410..a6598cb 100644
    --- a/arch/x86/kvm/vmx.c
    +++ b/arch/x86/kvm/vmx.c
    @@ -1649,7 +1649,7 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu,
    var->limit = vmcs_read32(sf->limit);
    var->selector = vmcs_read16(sf->selector);
    ar = vmcs_read32(sf->ar_bytes);
    - if (ar & AR_UNUSABLE_MASK)
    + if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
    ar = 0;
    var->type = ar & 15;
    var->s = (ar >> 4) & 1;
    --
    1.6.0.6


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