Some instruction are obsolete in a long mode. Inject #UD.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
Resend with SOB. Sorry.
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 595c989..20e10a7 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1015,11 +1015,6 @@ done_prefixes:
}
}
- if (mode == X86EMUL_MODE_PROT64 && (c->d & No64)) {
- kvm_report_emulation_failure(ctxt->vcpu, "invalid x86/64 instruction");
- return -1;
- }
-
if (c->d & Group) {
group = c->d & GroupMask;
c->modrm = insn_fetch(u8, 1, c->eip);
@@ -1828,6 +1823,11 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops)
memcpy(c->regs, ctxt->vcpu->arch.regs, sizeof c->regs);
saved_eip = c->eip;
+ if (ctxt->mode == X86EMUL_MODE_PROT64 && (c->d & No64)) {
+ kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
+ goto done;
+ }
+
/* LOCK prefix is allowed only with some instructions */
if (c->lock_prefix && !(c->d & Lock)) {
kvm_queue_exception(ctxt->vcpu, UD_VECTOR);
--
Gleb.
--
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