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 E33FDC38142 for ; Tue, 24 Jan 2023 10:09:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233698AbjAXKJq (ORCPT ); Tue, 24 Jan 2023 05:09:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232963AbjAXKJp (ORCPT ); Tue, 24 Jan 2023 05:09:45 -0500 Received: from gnuweeb.org (gnuweeb.org [51.81.211.47]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1D8E40C0; Tue, 24 Jan 2023 02:09:43 -0800 (PST) Received: from localhost.localdomain (unknown [182.253.88.152]) by gnuweeb.org (Postfix) with ESMTPSA id 8A02481F43; Tue, 24 Jan 2023 10:09:37 +0000 (UTC) X-GW-Data: lPqxHiMPbJw1wb7CM9QUryAGzr0yq5atzVDdxTR0iA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gnuweeb.org; s=default; t=1674554983; bh=Ka0PR+gOrMntYuWhm7gpYFrtchUUScBBj6G6iTCQ7H4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EogxLyTeIRP8Bf3J9o6jl5n9XWNVtBCes21qAcxSEaM8Tyz4509KvB72aHFLdiIBb Q0iybni9K++MTznlFkyS1u8y8Y01qYp/YXYFdQCxpZqBeBj5eiU3TyLCa9TCMG5Qrh k1MdZ8dH+U1US2HllyuN2C+yiYIdEv47UKLzlRIxjd81DcBP14KgwUXUa+S6vPN/MX VG2KIxiyjwaIHgiko0f8SNnJ5Wk5TziXKnobE1Z1lQpHHGgvfsXvNd8tM6jJiL5g+g jnTR4dE3YRCPui6hrme2qOJhTjzk1NGEHhJQziL+bqWZ5qI7uzHfHnvix1TjdyJ8f3 AKedwO+41FCGw== From: Ammar Faizi To: "H. Peter Anvin" , x86 Mailing List Cc: Ammar Faizi , Dave Hansen , Dave Hansen , Xin Li , Thomas Gleixner , Andrew Cooper , Brian Gerst , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Shuah Khan , Ingo Molnar , Andy Lutomirski , "Kirill A. Shutemov" , Linux Kselftest Mailing List , Linux Kernel Mailing List Subject: [RFC PATCH v3 0/2] selftests/x86: sysret_rip update for FRED system Date: Tue, 24 Jan 2023 17:09:23 +0700 Message-Id: <20230124100926.637335-1-ammarfaizi2@gnuweeb.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: <25b96960-a07e-a952-5c23-786b55054126@zytor.com> <6cd0db14-c9e2-3598-fd10-4b473d78c373@citrix.com> <5ecc383c-621b-57d9-7f6d-d63496fca3b3@zytor.com> <20230124022729.596997-1-ammarfaizi2@gnuweeb.org> <20230124022729.596997-3-ammarfaizi2@gnuweeb.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ammar Faizi This is an RFC patchset v3: sysret_rip test update for Intel FRED architecture. Xin Li reported sysret_rip test fails at: assert(ctx->uc_mcontext.gregs[REG_EFL] == ctx->uc_mcontext.gregs[REG_R11]); in a FRED system. Let's handle the FRED system scenario too. The 'syscall' instruction in a FRED system doesn't set %r11=%rflags. There are two patches in this series. How to test this: $ make -C tools/testing/selftests/x86 $ tools/testing/selftests/x86/sysret_rip_64 Link: https://lore.kernel.org/lkml/5d4ad3e3-034f-c7da-d141-9c001c2343af@intel.com Fixes: 660602140103 ("selftests/x86: Add a selftest for SYSRET to noncanonical addresses") Link: https://lore.kernel.org/lkml/25b96960-a07e-a952-5c23-786b55054126@zytor.com Reported-by: Xin Li Co-developed-by: H. Peter Anvin (Intel) Signed-off-by: H. Peter Anvin (Intel) Acked-by: H. Peter Anvin (Intel) Signed-off-by: Ammar Faizi --- ## Changelog v3: - Test that we don't get a mix of REGS_SAVED and REGS_SYSRET, which is a major part of the point (hpa). ## Changelog v2: - Use "+r"(rsp) as the right way to avoid redzone problems per Andrew's comment (hpa). (Ref: https://lore.kernel.org/lkml/8f5c24df-514d-5d89-f58f-ec8c3eb1e049@zytor.com ) --- Ammar Faizi (2): selftests/x86: sysret_rip: Handle syscall in a FRED system selftests/x86: sysret_rip: Add more syscall tests with respect to `%rcx` and `%r11` tools/testing/selftests/x86/sysret_rip.c | 120 ++++++++++++++++++++++- 1 file changed, 119 insertions(+), 1 deletion(-) base-commit: e12ad468c22065a2826b2fc4c11d2113a7975301 -- Ammar Faizi