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Commit 6d2a0526 authored by Nadav Amit's avatar Nadav Amit Committed by Paolo Bonzini
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KVM: x86: Emulator should set DR6 upon GD like real CPU 



It should clear B0-B3 and set BD.

Signed-off-by: default avatarNadav Amit <namit@cs.technion.ac.il>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 3ffb2468

arch/x86/kvm/emulate.c

+8 −1
Original line number Diff line number Diff line
@@ -3588,8 +3588,15 @@ static int check_dr_read(struct x86_emulate_ctxt *ctxt) 
	if ((cr4 & X86_CR4_DE) && (dr == 4 || dr == 5))

		return emulate_ud(ctxt);



	if (check_dr7_gd(ctxt))

	if (check_dr7_gd(ctxt)) {

		ulong dr6;



		ctxt->ops->get_dr(ctxt, 6, &dr6);

		dr6 &= ~15;

		dr6 |= DR6_BD | DR6_RTM;

		ctxt->ops->set_dr(ctxt, 6, dr6);

		return emulate_db(ctxt);

	}



	return X86EMUL_CONTINUE;

}