From patchwork Wed Apr 20 03:04:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tong Tiangen X-Patchwork-Id: 12819665 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8BFDBC433EF for ; Wed, 20 Apr 2022 02:46:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=YsSGjSbUBh0idF6HwdgLrtkufhhvY8gFKhmvTo6amkc=; b=fkZcaY+IhlMVlx eiN9CR9nWn8Yus+/cK9xtjYm9GlsrkMEV7Pc5C4a0dlFQUIv+9sorB7NAeQefG4j6Lk26uvBVn2vH 4oBDT5kLjB4DxHzNv1E6U1dpCPAOSdnRdpSLfR7X+lzGUrfPLmYaJP5eonZc8YNYBLiS61esaEztC 8nA9Mbz5o6uF4g/np8ofxfkCVKy4o2eeDmVUfScVke89lc/jsA72P8q3gCcBpDUjsSrfjDUIYaAeM 2aN2momfzAISpxr3k/OOMjrL5Y1+z3b7VBowmkZurTMxRqwt2PhKKVdDuLbSEV3CLTVR8+BW4B0Oi nw7e7ly3vn4Cz7ip2GZA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nh0Lc-006zzg-C7; Wed, 20 Apr 2022 02:45:40 +0000 Received: from szxga08-in.huawei.com ([45.249.212.255]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nh0LY-006zxH-8m for linux-arm-kernel@lists.infradead.org; Wed, 20 Apr 2022 02:45:38 +0000 Received: from kwepemi100015.china.huawei.com (unknown [172.30.72.54]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4KjlPr2R1vz1J9nr; Wed, 20 Apr 2022 10:44:48 +0800 (CST) Received: from kwepemm600017.china.huawei.com (7.193.23.234) by kwepemi100015.china.huawei.com (7.221.188.125) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Wed, 20 Apr 2022 10:45:32 +0800 Received: from localhost.localdomain (10.175.112.125) by kwepemm600017.china.huawei.com (7.193.23.234) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Wed, 20 Apr 2022 10:45:31 +0800 From: Tong Tiangen To: Mark Rutland , James Morse , Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Robin Murphy , Dave Hansen , Catalin Marinas , Will Deacon , Alexander Viro , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , , "H . Peter Anvin" CC: , , , , Kefeng Wang , Xie XiuQi , Guohanjun , Tong Tiangen Subject: [PATCH -next v4 0/7]arm64: add machine check safe support Date: Wed, 20 Apr 2022 03:04:11 +0000 Message-ID: <20220420030418.3189040-1-tongtiangen@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220419_194536_675045_BBDFBD15 X-CRM114-Status: GOOD ( 18.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org With the increase of memory capacity and density, the probability of memory error increases. The increasing size and density of server RAM in the data center and cloud have shown increased uncorrectable memory errors. Currently, the kernel has a mechanism to recover from hardware memory errors. This patchset provides an new recovery mechanism. For arm64, the hardware memory error handling is do_sea() which divided into two cases: 1. The user state consumed the memory errors, the solution is kill the user process and isolate the error page. 2. The kernel state consumed the memory errors, the solution is panic. For case 2, Undifferentiated panic maybe not the optimal choice, it can be handled better, in some scenes, we can avoid panic, such as uaccess, if the uaccess fails due to memory error, only the user process will be affected, kill the user process and isolate the user page with hardware memory errors is a better choice. This patchset can be divided into three parts: 1. Patch 0/1/4 - make some minor fixes to the associated code. 2. Patch 3 - arm64 add support for machine check safe framework. 3. Pathc 5/6/7 - arm64 add uaccess and cow to machine check safe. Since V4: 1. According to Robin's suggestion, direct modify user_ldst and user_ldp in asm-uaccess.h and modify mte.S. 2. Add new macro USER_MC in asm-uaccess.h, used in copy_from_user.S and copy_to_user.S. 3. According to Robin's suggestion, using micro in copy_page_mc.S to simplify code. 4. According to KeFeng's suggestion, modify powerpc code in patch1. 5. According to KeFeng's suggestion, modify mm/extable.c and some code optimization. Since V3: 1. According to Mark's suggestion, all uaccess can be recovered due to memory error. 2. Scenario pagecache reading is also supported as part of uaccess (copy_to_user()) and duplication code problem is also solved. Thanks for Robin's suggestion. 3. According Mark's suggestion, update commit message of patch 2/5. 4. According Borisllav's suggestion, update commit message of patch 1/5. Since V2: 1.Consistent with PPC/x86, Using CONFIG_ARCH_HAS_COPY_MC instead of ARM64_UCE_KERNEL_RECOVERY. 2.Add two new scenes, cow and pagecache reading. 3.Fix two small bug(the first two patch). V1 in here: https://lore.kernel.org/lkml/20220323033705.3966643-1-tongtiangen@huawei.com/ Robin Murphy (1): arm64: mte: Clean up user tag accessors Tong Tiangen (6): x86, powerpc: fix function define in copy_mc_to_user arm64: fix types in copy_highpage() arm64: add support for machine check error safe arm64: add copy_{to, from}_user to machine check safe arm64: add {get, put}_user to machine check safe arm64: add cow to machine check safe arch/arm64/Kconfig | 1 + arch/arm64/include/asm/asm-extable.h | 33 +++++++++++ arch/arm64/include/asm/asm-uaccess.h | 15 +++-- arch/arm64/include/asm/extable.h | 1 + arch/arm64/include/asm/page.h | 10 ++++ arch/arm64/include/asm/uaccess.h | 4 +- arch/arm64/lib/Makefile | 2 + arch/arm64/lib/copy_from_user.S | 18 +++--- arch/arm64/lib/copy_page_mc.S | 86 ++++++++++++++++++++++++++++ arch/arm64/lib/copy_to_user.S | 18 +++--- arch/arm64/lib/mte.S | 4 +- arch/arm64/mm/copypage.c | 36 ++++++++++-- arch/arm64/mm/extable.c | 33 +++++++++++ arch/arm64/mm/fault.c | 27 ++++++++- arch/powerpc/include/asm/uaccess.h | 1 + arch/x86/include/asm/uaccess.h | 1 + include/linux/highmem.h | 8 +++ include/linux/uaccess.h | 9 +++ mm/memory.c | 2 +- 19 files changed, 278 insertions(+), 31 deletions(-) create mode 100644 arch/arm64/lib/copy_page_mc.S