Commit 495e1166 authored by Avi Kivity's avatar Avi Kivity Committed by Marcelo Tosatti
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KVM: VMX: Allow real mode emulation using vm86 with dpl=0 



Real mode is always entered from protected mode with dpl=0.  Since
the dpl doesn't affect execution, and we already override it to 3
in the vmcs (as vmx requires), we can allow execution in that state.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent c865c43d

arch/x86/kvm/vmx.c

+1 −1
Original line number Diff line number Diff line
@@ -3317,7 +3317,7 @@ static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg) 
		return false;

	if (var.limit != 0xffff)

		return false;

	if (ar != 0xf3)

	if ((ar | (3 << AR_DPL_SHIFT)) != 0xf3)

		return false;



	return true;