From patchwork Thu Oct 29 14:04:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Uros Bizjak X-Patchwork-Id: 11866489 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=-12.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 680C7C4363A for ; Thu, 29 Oct 2020 14:05:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F01DD2076B for ; Thu, 29 Oct 2020 14:05:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="NUtVMLv4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725848AbgJ2OFF (ORCPT ); Thu, 29 Oct 2020 10:05:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33128 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725710AbgJ2OFE (ORCPT ); Thu, 29 Oct 2020 10:05:04 -0400 Received: from mail-ed1-x541.google.com (mail-ed1-x541.google.com [IPv6:2a00:1450:4864:20::541]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 247A0C0613D3 for ; Thu, 29 Oct 2020 07:05:04 -0700 (PDT) Received: by mail-ed1-x541.google.com with SMTP id l24so3140840edj.8 for ; Thu, 29 Oct 2020 07:05:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/zaI+f/txWOZ0xKOmo7GdxyYlTLY1JVfc3R7UeR/0Es=; b=NUtVMLv4Bw7ze5Ck+7us9te0gtcg1z4NRTZNEWPgyk/T2jMCyV9AUI9YICZITwZxxa DZCM/DQum2kGGYx33N9OA3m5cVXOLukr9kIsetNG3I5duYRuOsXVHkooHjCQMQMZpb6S QPkgTI8WqqSJEU4Oit1abBpgv4Sp700qQd0df/zuLN2VL4wEOhIOZPe/8M0FduGQlHJA Yu3D7Fhke592NYsAxHlsKNDyFMaQVNrEdMcw/PCVr5fmMMt79nBeW47sixhNSgCZ335A 9KLETq/nTN9Z6AiBWV0D80IjXDkubykVmZXT2+t/GcpMu81ANSQN3i0MnbLrdaHn4bVl MZ+g== 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:mime-version :content-transfer-encoding; bh=/zaI+f/txWOZ0xKOmo7GdxyYlTLY1JVfc3R7UeR/0Es=; b=btWhCh14fq2nkK8WUPXXF30WsJ47G4V0qALoY7ze+C2ffa/rBvBkGhac/GEeeHucr9 qENMBrfpryhMpai8FOMwq2u4EsQ6fYiJRPTD+QcZpyrlplbDEu/KWBmpkPu4fHP5nRVl 37Gp2FSZEHP593uhjmB7euJlxPDh8L0NLU+4efCZRoejdPkeSPBrRJQ+PCOToZxR1iSh swJY+y9SvVoblLVdpTOIbLkK19PJI/jk+uB8YXGsdP/xqr39jTIU8Ow1uHNLM8DS0/Ld 9xOp5zWD4geP2gGcWPo7rcTuiP6fCBOfb7Jt4i+KQu/N/a7tNguh1co9yubk4ww6f+5/ PLJQ== X-Gm-Message-State: AOAM533ZY7C5JN6vTuFetD36Je/FZgp0HcGDqeepzCOCgQxeld0FEBj/ Lh5815xC9y9nQB5BSgyCrg9OKmxviCZ2eQ== X-Google-Smtp-Source: ABdhPJxwb7oKIvHT9vRy1RoHHsA6AkMv8uH5TUVNJM0gxmq1bUNDVbeL243iCPUrY6wPUDId2h7F8g== X-Received: by 2002:a05:6402:207c:: with SMTP id bd28mr4016747edb.316.1603980302527; Thu, 29 Oct 2020 07:05:02 -0700 (PDT) Received: from localhost.localdomain (93-103-18-160.static.t-2.net. [93.103.18.160]) by smtp.gmail.com with ESMTPSA id u23sm1531809ejy.87.2020.10.29.07.05.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Oct 2020 07:05:01 -0700 (PDT) From: Uros Bizjak To: kvm@vger.kernel.org Cc: Uros Bizjak , Paolo Bonzini , Sean Christopherson Subject: [PATCH] KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S Date: Thu, 29 Oct 2020 15:04:57 +0100 Message-Id: <20201029140457.126965-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Saves one byte in __vmx_vcpu_run for the same functionality. Cc: Paolo Bonzini Cc: Sean Christopherson Signed-off-by: Uros Bizjak --- arch/x86/kvm/vmx/vmenter.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S index 90ad7a6246e3..e85aa5faa22d 100644 --- a/arch/x86/kvm/vmx/vmenter.S +++ b/arch/x86/kvm/vmx/vmenter.S @@ -132,7 +132,7 @@ SYM_FUNC_START(__vmx_vcpu_run) mov (%_ASM_SP), %_ASM_AX /* Check if vmlaunch or vmresume is needed */ - cmpb $0, %bl + testb %bl, %bl /* Load guest registers. Don't clobber flags. */ mov VCPU_RCX(%_ASM_AX), %_ASM_CX