From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 189C6C433FE for ; Thu, 10 Dec 2020 08:16:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D12EC23D56 for ; Thu, 10 Dec 2020 08:16:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387657AbgLJIQ1 (ORCPT ); Thu, 10 Dec 2020 03:16:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387639AbgLJIQL (ORCPT ); Thu, 10 Dec 2020 03:16:11 -0500 Received: from mail-pl1-x642.google.com (mail-pl1-x642.google.com [IPv6:2607:f8b0:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37F03C061794; Thu, 10 Dec 2020 00:15:31 -0800 (PST) Received: by mail-pl1-x642.google.com with SMTP id u4so2372289plr.12; Thu, 10 Dec 2020 00:15:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=1rCIZ2aFQJb9JggKwJdiRgk6PJ0mPfhOdiJnDt3jhOo=; b=lFPUvVgKLCb8cKfBI6Axvd/IQCepYEs4CksDpqIJjvTNRMkbc7z8zsgW0LM+RLJorT NKQR/c6VdD5A71ojCvDSNOj0wTszbLhRSsRY8Qha7utYuuo91F/OaFrFRQumz+LQHuBH CWuiFtNbDBp8Dd32oWDu+EMpuG88Q1sqLIXeq7OCF21l5sE008HV1sSZ2vLKstkT19v9 SpiUUJomSwL+q8HgC3ifq22IKALy3WoBnhDw5LX5r4qLBBAadwG944I3gdcQs3mVH9v4 0YO+/jxtEB5PBMBZcXUDt0XAKNzj24FOsJLOy/ZA/SzRspXV9tm3rt2ojlyLcBAbc4wT McTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=1rCIZ2aFQJb9JggKwJdiRgk6PJ0mPfhOdiJnDt3jhOo=; b=qyd+5LMW73EOgQ2DYO8BtJehzfqLU+MocqLHbkV5TQw9fZetwutQMIYpTEkIx4TEol x/b5W0xU3ZNerKBGDIjI1pl89DgsdWd68C1nU/reaidJ4rXtXPfjmeZhiXt9v3ZXsPtz QXHYbXH+/xNviQEaqUomf2vFU4w4OyvaSjGv50QtXeqJC371s3mJHWK11aUbP8ngqW0U jn1N/c4V469CEMcSJy0YrzilZH0apm9YBYVHECbE77uyW87tRp2fj+04eKsphn/KhA6f IEyKSkGhhYRcu3gzj5UEz8IvcNfTpG3+gZLnL7R3v7ARRiZ2PO9Wh94CEtsbbAW+51A/ cvnQ== X-Gm-Message-State: AOAM532OfjA55rsjq9wTL0PgpQsMLoB4OQ4+Ti40Ip8Aw3k3T5z6qaQN vBf9lsZr4zlQAa0Dw4EAtIY= X-Google-Smtp-Source: ABdhPJwm8acp3VmSgLF4pkd4f+rev8FIhe932yQHoQ7mQ7d4+mL2H0/sL0SbBBfGsl4vQ+vszUpsAw== X-Received: by 2002:a17:902:ea89:b029:da:539e:9bb with SMTP id x9-20020a170902ea89b02900da539e09bbmr5826549plb.52.1607588130780; Thu, 10 Dec 2020 00:15:30 -0800 (PST) Received: from localhost.localdomain (ec2-18-162-59-208.ap-east-1.compute.amazonaws.com. [18.162.59.208]) by smtp.gmail.com with ESMTPSA id q70sm5129650pja.39.2020.12.10.00.15.27 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Dec 2020 00:15:30 -0800 (PST) From: Stephen Zhang To: pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Stephen Zhang Subject: [PATCH] kvm:vmx:code changes in handle_io() to save some CPU cycles. Date: Thu, 10 Dec 2020 16:15:15 +0800 Message-Id: <1607588115-29971-1-git-send-email-starzhangzsd@gmail.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org code changes in handle_io() to save some CPU cycles. Signed-off-by: Stephen Zhang --- arch/x86/kvm/vmx/vmx.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 47b8357..109bcf64 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -4899,15 +4899,14 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu) static int handle_io(struct kvm_vcpu *vcpu) { unsigned long exit_qualification; - int size, in, string; + int size, in; unsigned port; exit_qualification = vmx_get_exit_qual(vcpu); - string = (exit_qualification & 16) != 0; ++vcpu->stat.io_exits; - if (string) + if (exit_qualification & 16) return kvm_emulate_instruction(vcpu, 0); port = exit_qualification >> 16; -- 1.8.3.1