[PATCH] KVM: VMX: Fix check guest state validity if a guest is in VM86 mode

[Gleb Natapov <gleb@xxxxxxxxxx>]

If guest vcpu is in VM86 mode the vcpu state should be checked as if in
real mode.

Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index d268677..fec7c48 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3554,7 +3554,7 @@ static bool guest_state_valid(struct kvm_vcpu *vcpu)
 		return true;
 
 	/* real mode guest state checks */
-	if (!is_protmode(vcpu)) {
+	if (!is_protmode(vcpu) || (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) {
 		if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
 			return false;
 		if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
--
			Gleb.
--
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