From a81aba14dc0ea499f4c218b5db0303b2ea8151d3 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Tue, 21 Aug 2012 17:07:10 +0300 Subject: [PATCH] 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 Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/vmx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 62b2d0cf2a7f..248c2b490e9b 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; -- 2.20.1