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authorAvi Kivity <avi@redhat.com>2012-08-21 17:07:10 +0300
committerMarcelo Tosatti <mtosatti@redhat.com>2012-08-27 20:02:21 -0300
commita81aba14dc0ea499f4c218b5db0303b2ea8151d3 (patch)
treeee2394f2db2507661eadcf0a6f4c7e1097395540 /arch/x86
parentce5668034752e52e995c8dc625337380099a088a (diff)
KVM: VMX: Ignore segment G and D bits when considering whether we can virtualize
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/vmx.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 62b2d0cf2a7..248c2b490e9 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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;