[{"id":1846259,"web_url":"http://patchwork.ozlabs.org/comment/1846259/","msgid":"","list_archive_url":null,"date":"2018-01-25T17:11:09","subject":"Re: [PATCH v4 0/4] arm64/ras: support sea error recovery","submitter":{"id":69885,"url":"http://patchwork.ozlabs.org/api/people/69885/","name":"Tyler Baicar","email":"tbaicar@codeaurora.org"},"content":"Hello Xie,\n\n\nOn 9/27/2017 8:50 AM, Xie XiuQi wrote:\n> With ARM v8.2 RAS Extension, SEA are usually triggered when memory errors\n> are consumed. According to the existing process, errors occurred in the\n> kernel, leading to direct panic, if it occurred the user-space, we should\n> just kill process.\n>\n> But there is a class of error, in fact, is not necessary to kill\n> process, you can recover and continue to run the process. Such as\n> the instruction data corrupted, where the memory page might be\n> read-only, which is has not been modified, the disk might have the\n> correct data, so you can directly drop the page, ant reload it when\n> necessary.\n>\n> So this patchset is just try to solve such problem: if the error is\n> consumed in user-space and the error occurs on a clean page, you can\n> directly drop the memory page without killing process.\n>\n> If the corrupted page is clean, just dropped it and return to user-space\n> without side effects. And if corrupted page is dirty, memory_failure()\n> will send SIGBUS with code=BUS_MCEERR_AR. While without this patchset,\n> do_sea() will just send SIGBUS, so the process was killed in the same place.\n>\n> Because memory_failure() may sleep, we can not call it directly in SEA\n> exception context. So we saved faulting physical address associated with\n> a process in the ghes handler and set __TIF_SEA_NOTIFY. When we return\n> from SEA exception context and get into do_notify_resume() before the\n> process running, we could check it and call memory_failure() to do\n> recovery. It's safe, because we are in process context.\n>\n> In some platform, when SEA triggerred, physical address could be reported\n> by memory section or by processor section, so we save address at this two\n> place.\nFor this series - Tested-by: Tyler Baicar \n\nNote that this will probably need to be rebased on top of these patches:\n\nhttps://patchwork.codeaurora.org/patch/415877/\nhttps://patchwork.codeaurora.org/patch/415879/\n\nWith that, the first patch should be able to be removed because the above \npatches already define the ARM error types:\n\n+#define CPER_ARM_CACHE_ERROR            0\n+#define CPER_ARM_TLB_ERROR            1\n+#define CPER_ARM_BUS_ERROR            2\n+#define CPER_ARM_VENDOR_ERROR            3\n\nThanks,\nTyler","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; 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WOW64; rv:52.0) Gecko/20100101\n\tThunderbird/52.5.2","MIME-Version":"1.0","In-Reply-To":"<1506516620-20033-1-git-send-email-xiexiuqi@huawei.com>","Content-Language":"en-US","X-Spam-Note":"CRM114 invocation failed","X-Spam-Score":"-4.3 (----)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-4.3 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/,\n\tmedium trust [198.145.29.96 listed in list.dnswl.org]\n\t-0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay\n\tdomain\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]\n\t0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n\tnot necessarily valid\n\t-0.1 DKIM_VALID Message has at least one valid DKIM or DK signature\n\t-0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n\tauthor's domain","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"wangkefeng.wang@huawei.com, cj.chengjian@huawei.com,\n\tlinux-kernel@vger.kernel.org, gengdongjiu@huawei.com,\n\tlijinyue@huawei.com, linux-acpi@vger.kernel.org, hanjun.guo@linaro.org,\n\thuawei.libin@huawei.com, guohanjun@huawei.com, zhengqiang10@huawei.com,\n\twangxiongfeng2@huawei.com, linux-arm-kernel@lists.infradead.org","Content-Transfer-Encoding":"base64","Content-Type":"text/plain; charset=\"utf-8\"; Format=\"flowed\"","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1846469,"web_url":"http://patchwork.ozlabs.org/comment/1846469/","msgid":"<7a14f1fb-6176-1033-8121-87c872c99c8c@huawei.com>","list_archive_url":null,"date":"2018-01-26T02:09:23","subject":"Re: [PATCH v4 0/4] arm64/ras: support sea error recovery","submitter":{"id":24815,"url":"http://patchwork.ozlabs.org/api/people/24815/","name":"Xie XiuQi","email":"xiexiuqi@huawei.com"},"content":"Hi Tyler,\n\nOn 2018/1/26 1:11, Tyler Baicar wrote:\n> For this series - Tested-by: Tyler Baicar \n> \n> Note that this will probably need to be rebased on top of these patches:\n\nThank you for your testing, I'll rebase then.\n\n> \n> https://patchwork.codeaurora.org/patch/415877/\n> https://patchwork.codeaurora.org/patch/415879/\n> \n> With that, the first patch should be able to be removed because the above patches already define the ARM error types:\n> \n> +#define CPER_ARM_CACHE_ERROR 0\n> +#define CPER_ARM_TLB_ERROR 1\n> +#define CPER_ARM_BUS_ERROR 2\n> +#define CPER_ARM_VENDOR_ERROR 3","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; 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a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20170209; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post:\n\tList-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:\n\tMessage-ID:From:References:To:Subject:Reply-To:Content-ID:Content-Description\n\t:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=C/NGqmgGSOVYOdTL64X2LjmDEVcHi7bUvsDApH26dUg=;\n\tb=b7/IBkTbUPUCQH\n\tiSYX7l5x+MgEhhA47TskppYF2FCHgv6s6JsBsM29tXpRr6Fpw7W5hy5hTq3QbUr4Rac2neScds7ZD\n\tijlA78nXm3YGnwG5SOUuy02SwaAIG4rsNAxPsJ9F0n3R5VhKMlYzW2qykM2qqOPtxnvD1tYufwysi\n\tj4pazQd3uyz1fTwQaJylnmjg/gvuwjxe66ENYZlLUcQjkohBHgtor8ZVTDe+P4u8UmbHqNvUKRjAc\n\tApDWQSIGW+nG/DE5IPL+FZson4PfhsB72b8fyg40N1FeyarxSBt8wqMIVia725Tq2yeixlVyRbM+p\n\tH603PpGrdNrFj3plhSeA==;","Subject":"Re: [PATCH v4 0/4] arm64/ras: support sea error recovery","To":"Tyler Baicar , ,\n\t, , ,\n\t, ,\n\t, \n\t, , ,\n\t, ,\n\t","References":"<1506516620-20033-1-git-send-email-xiexiuqi@huawei.com>\n\t","From":"Xie XiuQi ","Message-ID":"<7a14f1fb-6176-1033-8121-87c872c99c8c@huawei.com>","Date":"Fri, 26 Jan 2018 10:09:23 +0800","User-Agent":"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101\n\tThunderbird/45.8.0","MIME-Version":"1.0","In-Reply-To":"","X-Originating-IP":"[10.177.19.210]","X-CFilter-Loop":"Reflected","X-Spam-Note":"CRM114 invocation failed","X-Spam-Score":"-1.9 (-)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-1.9 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/,\n\tno trust [45.249.212.190 listed in list.dnswl.org]\n\t-0.0 SPF_HELO_PASS SPF: HELO matches SPF record\n\t-0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay\n\tdomain\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"wangkefeng.wang@huawei.com, cj.chengjian@huawei.com,\n\tlinux-kernel@vger.kernel.org, gengdongjiu@huawei.com,\n\tlijinyue@huawei.com, linux-acpi@vger.kernel.org, hanjun.guo@linaro.org,\n\thuawei.libin@huawei.com, guohanjun@huawei.com, zhengqiang10@huawei.com,\n\twangxiongfeng2@huawei.com, linux-arm-kernel@lists.infradead.org","Content-Type":"text/plain; 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