From: Gleb Natapov <[email protected]> When x86_emulate_insn() does not know how to emulate instruction it exits via cannot_emulate label in all cases except when emulating grp3. Fix that.
Signed-off-by: Gleb Natapov <[email protected]> Signed-off-by: Marcelo Tosatti <[email protected]> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 46a7ee3..d696cbd 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -1397,7 +1397,6 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) { struct decode_cache *c = &ctxt->decode; - int rc = X86EMUL_CONTINUE; switch (c->modrm_reg) { case 0 ... 1: /* test */ @@ -1410,11 +1409,9 @@ static inline int emulate_grp3(struct x86_emulate_ctxt *ctxt, emulate_1op("neg", c->dst, ctxt->eflags); break; default: - DPRINTF("Cannot emulate %02x\n", c->b); - rc = X86EMUL_UNHANDLEABLE; - break; + return 0; } - return rc; + return 1; } static inline int emulate_grp45(struct x86_emulate_ctxt *ctxt, @@ -2374,9 +2371,8 @@ special_insn: c->dst.type = OP_NONE; /* Disable writeback. */ break; case 0xf6 ... 0xf7: /* Grp3 */ - rc = emulate_grp3(ctxt, ops); - if (rc != X86EMUL_CONTINUE) - goto done; + if (!emulate_grp3(ctxt, ops)) + goto cannot_emulate; break; case 0xf8: /* clc */ ctxt->eflags &= ~EFLG_CF; -- To unsubscribe from this list: send the line "unsubscribe kvm-commits" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
