From patchwork Thu Apr 9 12:04:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Uros Bizjak X-Patchwork-Id: 11481665 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 95AFF81 for ; Thu, 9 Apr 2020 12:04:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B619208FE for ; Thu, 9 Apr 2020 12:04:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="LyKE1uLA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726687AbgDIMEu (ORCPT ); Thu, 9 Apr 2020 08:04:50 -0400 Received: from mail-wr1-f67.google.com ([209.85.221.67]:37498 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725971AbgDIMEt (ORCPT ); Thu, 9 Apr 2020 08:04:49 -0400 Received: by mail-wr1-f67.google.com with SMTP id w10so11639989wrm.4 for ; Thu, 09 Apr 2020 05:04:47 -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=lCmPfTqm1cRtMIpvXq734SPUvTONQxpqo1sItgL7b4o=; b=LyKE1uLASPzUYs4GBcNp6r5h5YHAV2+DPhgSp5owG1mKLASYAvj0K/6/XGLWYj+ueC bPzhcZV40BHD59DIOki8xpnTLkDbNmVQkdl8zVyRD8SNO8TB69lfArzq/xpdDWxrkJTl kv+sArnR3jUnnLxlq01av6GlHGLZ5Uhe/Axq6Sfc3zVc5aUvkwis9errWskiyTwH0nha Sq0ZeUR4foe5hvgURdApv6TtaJV9ObwqlOceRyhgHfdaWKT414QUxjK5jfTt8UGofQTX tDWASp/CacC8RIPtD3Pa/kX8JIVEzBmCzL8fbDFDYmrtqiIHtPr2WiFFe6dNwnxBrGQu tbKA== 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=lCmPfTqm1cRtMIpvXq734SPUvTONQxpqo1sItgL7b4o=; b=jywSNMpyWrTbhRi16h2C26yzP3c8yF4LBNy+FeqVptEFDaHA3Qvlj3tN9iFnt+9wXU iVjaRcHXdr40lWFyF0PpgrppmykfPrTSmFoY9T2pkoRUXKIK2nzXQw0yEERZH03dN7tZ dJ3uoi9zOKFUrLGBOVbShtBTP5PP3aeF3pO3AGCNhGS3NhueUUmX01hS2iH8Dc/T9vrx aiWI6633ccTNAgaI6P+xQ/WnicMFFQdUuUQK73fA/wfMaKnsT3gber6dSoBGyfa49NKw ozp7rnRj421Utl9Patktb8BOKUduKlR0e6D4oYcn62UHK3N++Bc76xWq+wkqtG4tFdJi zHBw== X-Gm-Message-State: AGi0PuZZUnWedOHe/WBkt4sDKzqrCSbMSreoddPUADCBxVOAiudorsVc /PMirJGwzYkXNvRbolB/mQSBxvRYC2k= X-Google-Smtp-Source: APiQypKOdYcsZ7tQmIT9Bg2GAIpd7YZFeplUbWXhnfvRK6Cb62GWg59W4mb0M2Hr44hx5k4YjxMJ9w== X-Received: by 2002:adf:f8cd:: with SMTP id f13mr13466696wrq.119.1586433886815; Thu, 09 Apr 2020 05:04:46 -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 e5sm41110117wru.92.2020.04.09.05.04.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Apr 2020 05:04:46 -0700 (PDT) From: Uros Bizjak To: kvm@vger.kernel.org Cc: Uros Bizjak , Paolo Bonzini Subject: [PATCH] KVM: SVM: Do not setup frame pointer in __svm_vcpu_run Date: Thu, 9 Apr 2020 14:04:40 +0200 Message-Id: <20200409120440.1427215-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.25.2 MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org __svm_vcpu_run is a leaf function and does not need a frame pointer. %rbp is also destroyed a few instructions later when guest registers are loaded. Cc: Paolo Bonzini Signed-off-by: Uros Bizjak --- arch/x86/kvm/svm/vmenter.S | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S index fa1af90067e9..c87119a7a0c9 100644 --- a/arch/x86/kvm/svm/vmenter.S +++ b/arch/x86/kvm/svm/vmenter.S @@ -35,7 +35,6 @@ */ SYM_FUNC_START(__svm_vcpu_run) push %_ASM_BP - mov %_ASM_SP, %_ASM_BP #ifdef CONFIG_X86_64 push %r15 push %r14