Emulation of undefined opcode should inject #UD instead of causing
emulation failure. Do that by moving Undefined flag check to emulation
stage and injection #UD there.
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index c2b7f33..2f66e98 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4374,7 +4374,7 @@ done_prefixes:
ctxt->intercept = opcode.intercept;
/* Unrecognised? */
- if ((ctxt->d & NotImpl) || (ctxt->d & Undefined))
+ if ((ctxt->d & NotImpl))
return EMULATION_FAILED;
if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
@@ -4512,7 +4512,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
ctxt->mem_read.pos = 0;
- if (ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) {
+ if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
+ (ctxt->d & Undefined)) {
rc = emulate_ud(ctxt);
goto done;
}
--
1.7.10.4
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