From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: [PATCHv2 2/3] KVM: x86 emulator: move string instruction completion check into separate function Date: Wed, 25 Aug 2010 12:47:42 +0300 Message-ID: <1282729663-12619-2-git-send-email-gleb@redhat.com> References: <1282729663-12619-1-git-send-email-gleb@redhat.com> Cc: kvm@vger.kernel.org To: avi@redhat.com, mtosatti@redhat.com Return-path: Received: from mx1.redhat.com ([209.132.183.28]:5602 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751216Ab0HYJrp (ORCPT ); Wed, 25 Aug 2010 05:47:45 -0400 Received: from int-mx03.intmail.prod.int.phx2.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.16]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o7P9ljW2019437 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 25 Aug 2010 05:47:45 -0400 In-Reply-To: <1282729663-12619-1-git-send-email-gleb@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Signed-off-by: Gleb Natapov --- arch/x86/kvm/emulate.c | 37 ++++++++++++++++++++++++------------- 1 files changed, 24 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 8a77c99..922f874 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2938,6 +2938,28 @@ done: return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; } +static bool string_insn_completed(struct x86_emulate_ctxt *ctxt) +{ + struct decode_cache *c = &ctxt->decode; + + /* The second termination condition only applies for REPE + * and REPNE. Test if the repeat string operation prefix is + * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the + * corresponding termination condition according to: + * - if REPE/REPZ and ZF = 0 then done + * - if REPNE/REPNZ and ZF = 1 then done + */ + if (((c->b == 0xa6) || (c->b == 0xa7) || + (c->b == 0xae) || (c->b == 0xaf)) + && (((c->rep_prefix == REPE_PREFIX) && + ((ctxt->eflags & EFLG_ZF) == 0)) + || ((c->rep_prefix == REPNE_PREFIX) && + ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)))) + return true; + + return false; +} + int x86_emulate_insn(struct x86_emulate_ctxt *ctxt) { @@ -3426,19 +3448,8 @@ writeback: if (c->rep_prefix && (c->d & String)) { struct read_cache *r = &ctxt->decode.io_read; register_address_increment(c, &c->regs[VCPU_REGS_RCX], -1); - /* The second termination condition only applies for REPE - * and REPNE. Test if the repeat string operation prefix is - * REPE/REPZ or REPNE/REPNZ and if it's the case it tests the - * corresponding termination condition according to: - * - if REPE/REPZ and ZF = 0 then done - * - if REPNE/REPNZ and ZF = 1 then done - */ - if (((c->b == 0xa6) || (c->b == 0xa7) || - (c->b == 0xae) || (c->b == 0xaf)) - && (((c->rep_prefix == REPE_PREFIX) && - ((ctxt->eflags & EFLG_ZF) == 0)) - || ((c->rep_prefix == REPNE_PREFIX) && - ((ctxt->eflags & EFLG_ZF) == EFLG_ZF)))) + + if (string_insn_completed(ctxt)) ctxt->restart = false; /* * Re-enter guest when pio read ahead buffer is empty or, -- 1.7.1