From: Takuya Yoshikawa <yoshikawa.takuya@xxxxxxxxxxxxx>
Return EMULATION_OK/FAILED consistently. Also treat instruction fetch
errors, not restricted to X86EMUL_UNHANDLEABLE, as EMULATION_FAILED;
although this cannot happen in practice, the current logic will continue
the emulation even if the decoder fails to fetch the instruction.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@xxxxxxxxxxxxx>
---
arch/x86/kvm/emulate.c | 12 ++++++------
arch/x86/kvm/x86.c | 2 +-
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ae8d23c..0453c07 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3373,7 +3373,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
break;
#endif
default:
- return -1;
+ return EMULATION_FAILED;
}
ctxt->op_bytes = def_op_bytes;
@@ -3465,7 +3465,7 @@ done_prefixes:
break;
case Prefix:
if (ctxt->rep_prefix && op_prefix)
- return X86EMUL_UNHANDLEABLE;
+ return EMULATION_FAILED;
simd_prefix = op_prefix ? 0x66 : ctxt->rep_prefix;
switch (simd_prefix) {
case 0x00: opcode = opcode.u.gprefix->pfx_no; break;
@@ -3475,7 +3475,7 @@ done_prefixes:
}
break;
default:
- return X86EMUL_UNHANDLEABLE;
+ return EMULATION_FAILED;
}
ctxt->d &= ~GroupMask;
@@ -3488,10 +3488,10 @@ done_prefixes:
/* Unrecognised? */
if (ctxt->d == 0 || (ctxt->d & Undefined))
- return -1;
+ return EMULATION_FAILED;
if (!(ctxt->d & VendorSpecific) && ctxt->only_vendor_specific_insn)
- return -1;
+ return EMULATION_FAILED;
if (mode == X86EMUL_MODE_PROT64 && (ctxt->d & Stack))
ctxt->op_bytes = 8;
@@ -3683,7 +3683,7 @@ done:
if (memopp && memopp->type == OP_MEM && ctxt->rip_relative)
memopp->addr.mem.ea += ctxt->_eip;
- return (rc == X86EMUL_UNHANDLEABLE) ? EMULATION_FAILED : EMULATION_OK;
+ return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
}
static bool string_insn_completed(struct x86_emulate_ctxt *ctxt)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6cb353c..baa427a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4833,7 +4833,7 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu,
trace_kvm_emulate_insn_start(vcpu);
++vcpu->stat.insn_emulation;
- if (r) {
+ if (r != EMULATION_OK) {
if (emulation_type & EMULTYPE_TRAP_UD)
return EMULATE_FAIL;
if (reexecute_instruction(vcpu, cr2))
--
1.7.4.1
--
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