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KVM: VMX: Ignore segment G and D bits when considering whether we can virtualize

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We will enter the guest with G and D cleared; as real hardware ignores D in
real mode, and G is taken care of by the limit test, we allow more code to
run in vm86 mode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2012-08-21 17:07:10 +03:00 committed by Marcelo Tosatti
parent ce56680347
commit a81aba14dc
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/vmx.c
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@ -3320,7 +3320,7 @@ static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
return false;
if (var.limit < 0xffff)
return false;
if ((ar | (3 << AR_DPL_SHIFT)) != 0xf3)
if (((ar | (3 << AR_DPL_SHIFT)) & ~(AR_G_MASK | AR_DB_MASK)) != 0xf3)
return false;
return true;