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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: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-11-02 11:54:43 +02:00 committed by Paolo Bonzini
parent 3ffb24681c
commit 6d2a0526b0
1 changed files with 8 additions and 1 deletions
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9
arch/x86/kvm/emulate.c
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@ -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;
}