[PATCH v2 3/3] KVM: x86: set ctxt->have_exception in x86_decode_insn()

[Jan Dakinevich]

x86_emulate_instruction() takes into account ctxt->have_exception flag
during instruction decoding, but in practice this flag is never set in
x86_decode_insn().

Fixes: 6ea6e84 ("KVM: x86: inject exceptions produced by x86_decode_insn")
Cc: Denis Lunev <den@xxxxxxxxxxxxx>
Cc: Roman Kagan <rkagan@xxxxxxxxxxxxx>
Cc: Denis Plotnikov <dplotnikov@xxxxxxxxxxxxx>
Signed-off-by: Jan Dakinevich <jan.dakinevich@xxxxxxxxxxxxx>
---
 arch/x86/kvm/emulate.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index bef3c3c..74b4d79 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -5416,6 +5416,11 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
 					ctxt->memopp->addr.mem.ea + ctxt->_eip);
 
 done:
+	if (rc == X86EMUL_PROPAGATE_FAULT) {
+		WARN_ON_ONCE(ctxt->exception.vector == UD_VECTOR ||
+			     exception_type(ctxt->exception.vector) == EXCPT_TRAP);
+		ctxt->have_exception = true;
+	}
 	return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
 }
 
-- 
2.1.4