diff options
| author | Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> | 2011-07-30 11:03:34 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-09-25 18:18:01 +0200 |
| commit | 1d2887e2d849969f58ce79203f9785ebe065d494 (patch) | |
| tree | 9ca6e1bfdf14e646b9816aa45a18230e1880784d /arch/x86/kvm/emulate.c | |
| parent | KVM: x86 emulator: Let compiler know insn_fetch() rarely fails (diff) | |
| download | linux-1d2887e2d849969f58ce79203f9785ebe065d494.tar.xz linux-1d2887e2d849969f58ce79203f9785ebe065d494.zip | |
KVM: x86 emulator: Make x86_decode_insn() return proper macros
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@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/emulate.c')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 191bc9be4946..fe5eb6d9b3e1 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) |