Commit 495e1166 authored Aug 21, 2012 by Avi Kivity Committed by Marcelo Tosatti Aug 27, 2012

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: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo 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;