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=-14.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,HK_RANDOM_FROM,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_2 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 1ADBDC433E6 for ; Tue, 23 Feb 2021 12:45:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E220164DDA for ; Tue, 23 Feb 2021 12:45:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232489AbhBWMpZ (ORCPT ); Tue, 23 Feb 2021 07:45:25 -0500 Received: from mail.kingsoft.com ([114.255.44.145]:12139 "EHLO mail.kingsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232452AbhBWMpX (ORCPT ); Tue, 23 Feb 2021 07:45:23 -0500 X-AuditID: 0a580155-713ff700000550c6-4e-6034f1ae9785 Received: from mail.kingsoft.com (localhost [10.88.1.32]) (using TLS with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mail.kingsoft.com (SMG-2-NODE-85) with SMTP id 6C.18.20678.EA1F4306; Tue, 23 Feb 2021 20:14:38 +0800 (HKT) Received: from alex-virtual-machine (172.16.253.254) by KSBJMAIL2.kingsoft.cn (10.88.1.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Tue, 23 Feb 2021 20:44:37 +0800 Date: Tue, 23 Feb 2021 20:44:36 +0800 From: Aili Yao To: "HORIGUCHI =?UTF-8?B?TkFPWUE=?=(=?UTF-8?B?5aCA5Y+j44CA55u05Lmf?=)" CC: "tony.luck@intel.com" , "dave.hansen@linux.intel.com" , "luto@kernel.org" , "peterz@infradead.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "hpa@zytor.com" , "x86@kernel.org" , "YANGFENG1@kingsoft.com" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access. Message-ID: <20210223204436.1df73153@alex-virtual-machine> In-Reply-To: <20210205170135.22f771a2@alex-virtual-machine> References: <20210201161749.0e8dc212.yaoaili@kingsoft.com> <20210204072555.GA22850@hori.linux.bs1.fc.nec.co.jp> <20210205170135.22f771a2@alex-virtual-machine> Organization: kingsoft X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.30; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [172.16.253.254] X-ClientProxiedBy: KSBJMAIL1.kingsoft.cn (10.88.1.31) To KSBJMAIL2.kingsoft.cn (10.88.1.32) X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprOIsWRmVeSWpSXmKPExsXCFcGooLvuo0mCwa9fVhafN/xjs3ixoZ3R YtpGcYvLu+awWdxb85/V4vyutawWlw4sYLK42HiA0eJ47wEmi82bpjJbvLlwj8Xix4bHrA48 Ht9b+1g8Nq/Q8li85yWTx6ZVnWwemz5NYvd4d+4cu8e8k4EeL65uZPF4v+8qm8fnTXIeJ1q+ sAZwR3HZpKTmZJalFunbJXBlLL08l6ngJVvF9wUZDYx7WbsYOTkkBEwkPj/7yNTFyMUhJDCd SWLmuZmsEM4rRokXb+4wglSxCKhKTH+8hR3EZgOyd92bBdYtIpAksXj2V7BuZoEFLBLz1kIU CQskS5yZ9ACsmVfASuLQ44MsIDangLXEzY2XWCA2LGKU2Pv+JzNIgl9ATKL3yn8miJvsJdq2 LIJqFpQ4OfMJWDOzgI7EiVXHmCFseYntb+eA2UICihKHl/xih+hVkjjSPYMNwo6VWDbvFesE RuFZSEbNQjJqFpJRCxiZVzGyFOemG21ihMRd6A7GGU0f9Q4xMnEwHmKU4GBWEuFlu2uUIMSb klhZlVqUH19UmpNafIhRmoNFSZx36laTBCGB9MSS1OzU1ILUIpgsEwenVAOTiKPksZT0aXaW qZpTTVqaf4V0ruMxN963O+FaQmdXxrXGm5fmNnXWyFiXv9q/8oVEgWiGh2eF+NNZ7QoOjpHu W0yfbZyY+G9+16PSq+zFh5mXRJzfvLi78+l1gULpu+9Da4xto64f27rsEctfEbn9+094bIoR s5n88TrvNvGGc92amwLju8UPTWUxXSj+tH4Fg/exj0z/ohZH8kqbvjhza7V8w3V3x+d6rGcv G0qtTVcLlD2/aUPcRL22G1PKHb/rryvi/y7nPllW+MUk9qfdfluVOP59++n78WJeor7FnsPp 4UrHYg2eOC40NzPa5NqwbfGvhMkGq8WKjoqJC96dWHZf+dPT1E3beHTv769QYinOSDTUYi4q TgQAYhT6lSoDAAA= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 5 Feb 2021 17:01:35 +0800 Aili Yao wrote: > When one page is already hwpoisoned by MCE AO action, processes may not > be killed, processes mapping this page may make a syscall include this > page and result to trigger a VM_FAULT_HWPOISON fault, as it's in kernel > mode it may be fixed by fixup_exception, current code will just return > error code to user code. > > This is not sufficient, we should send a SIGBUS to the process and log > the info to console, as we can't trust the process will handle the error > correctly. > > Suggested-by: Feng Yang > Signed-off-by: Aili Yao > --- > arch/x86/mm/fault.c | 62 +++++++++++++++++++++++++++++---------------- > 1 file changed, 40 insertions(+), 22 deletions(-) > Hi luto; Is there any feedback? Thanks Aili Yao