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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EEB7C433EF for ; Thu, 28 Apr 2022 15:58:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343948AbiD1QB1 (ORCPT ); Thu, 28 Apr 2022 12:01:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232991AbiD1QBZ (ORCPT ); Thu, 28 Apr 2022 12:01:25 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5027DAD136 for ; Thu, 28 Apr 2022 08:58:11 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id n8so4763845plh.1 for ; Thu, 28 Apr 2022 08:58:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=D5W8BN5fLNgb1BgZas8DGUwqs+FBpTKYjzFWJMRULiM=; b=qsI0KU2AcANsDpqsXtUnUZJOk0dmozYqNgewlnAM2LK8cA/kQnraOZY7+1eCfPzfOh VwJvcRX6gaupGUFTEoGwtjBH2rxZONEC3Zta+7r0FY6N+XCvRNP1UQ2txhDbO+9kq3ZT ZqMDeIzd0hlCqzQKVKpkJvoBvoAzbauay59lfSR28dsAbkar5A0Gq64Ee/UBcdYIGrgJ VMxK/Zu0j6QXj1u0KNoZovieRC/mE8ftoOmOH7OsOZtYMgXjaECbAcy5PtSjMBMSp+vv qu2Y1yxr+RrGscUX1XyivmJA40iQB6uwNfjlHfGk1FmwMEcPNd+EVZOUUy5pCiPME+1z 46Tw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=D5W8BN5fLNgb1BgZas8DGUwqs+FBpTKYjzFWJMRULiM=; b=QjEUAzrK6R4948SJ/XYScrm6KVI+3gob2g7aZlV6cLneCx7sW7eUHYXhu+4bv5+ahj TCLXnESyif2x7MaI3AgvUSgE2+pZpH3ylqpb9M1CSui8AciOts08oo24PR9zILwFKU8O xxFX6qyuEOWFpyxdyx/HPgSlADDxzgGgh90kUtRVE1knZcQbODyFxX8xJT8/x356ADJm IQFOMWtPrA+MMTnOGnHpevrD0K0AhDXdZ2LoMfSlKQZstz5/DVrkP0SdKufalW8nYGW1 g2V31gNXpL6t9a2Q+S86kbIfj3ag4+W2O96pUxGv+Dx3cvL8x7ew+2rKJWAH8Y/4Be7K L5oA== X-Gm-Message-State: AOAM531NXCrLhGQLPqwjO9bFVuOm8H3PBPx/jeu3Y0I/FYBSHEsUuPu6 4dfOEj5zmLXm+WscpFBTmijVFg== X-Google-Smtp-Source: ABdhPJzfpQ9n5T0M/1gYzl/ihQ2cFlEXZ4t7vzP2iLTgnTlDoFcNQteDvy2UeFVkTh+pRLULL2NAdA== X-Received: by 2002:a17:902:e847:b0:15d:1533:3053 with SMTP id t7-20020a170902e84700b0015d15333053mr21056164plg.49.1651161490637; Thu, 28 Apr 2022 08:58:10 -0700 (PDT) Received: from google.com (157.214.185.35.bc.googleusercontent.com. [35.185.214.157]) by smtp.gmail.com with ESMTPSA id h132-20020a62838a000000b0050d3d6ad020sm242380pfe.205.2022.04.28.08.58.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Apr 2022 08:58:10 -0700 (PDT) Date: Thu, 28 Apr 2022 15:58:06 +0000 From: Sean Christopherson To: SU Hang Cc: drjones@redhat.com, kvm@vger.kernel.org, pbonzini@redhat.com, thuth@redhat.com Subject: Re: [kvm-unit-tests PATCH 2/2] x86: replace `int 0x20` with `syscall` Message-ID: References: <20220427092700.98464-1-darcy.sh@antgroup.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20220427092700.98464-1-darcy.sh@antgroup.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Wed, Apr 27, 2022, SU Hang wrote: > > It doesn't matter at this time because this framework doesn't ses SYSRET, but > > this should be USER_CS or USER_CS64. > Oops, intel SDM vol.3 says: > """ > When SYSRET transfers control to 64-bit mode user code using REX.W, the > processor gets the privilege level 3 target code segment, instruction pointer, > stack segment, and flags as follows: > • Target code segment — Reads a non-NULL selector from IA32_STAR[63:48] + 16. Ugh, missed that detail. > • Stack segment — IA32_STAR[63:48] + 8. > """