It should clear B0-B3 and set BD.
Signed-off-by: Nadav Amit <na...@cs.technion.ac.il>
---
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 efe7239..273c37e 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3568,8 +3568,15 @@ 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;
}
--
1.9.1
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