From 6d2a0526b09e551d0f395cfb63e7cb965db825af Mon Sep 17 00:00:00 2001 From: Nadav Amit Date: Sun, 2 Nov 2014 11:54:43 +0200 Subject: [PATCH] KVM: x86: Emulator should set DR6 upon GD like real CPU It should clear B0-B3 and set BD. Signed-off-by: Nadav Amit Signed-off-by: Paolo Bonzini --- arch/x86/kvm/emulate.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index a4703eb9c1ed..736a49f218ff 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -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; } -- 2.20.1