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Mon, 19 Apr 2021 11:43:54 +0800 (HKT) Received: from alex-virtual-machine (10.88.1.103) by KSBJMAIL4.kingsoft.cn (10.88.1.79) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Mon, 19 Apr 2021 11:43:54 +0800 Date: Mon, 19 Apr 2021 11:43:53 +0800 From: Aili Yao To: Naoya Horiguchi CC: "linux-mm@kvack.org" , Tony Luck , Andrew Morton , "Oscar Salvador" , David Hildenbrand , Borislav Petkov , Andy Lutomirski , "linux-kernel@vger.kernel.org" , "HORIGUCHI =?UTF-8?B?TkFPWUE=?=(=?UTF-8?B?5aCA5Y+j44CA55u05Lmf?=)" , Subject: Re: [PATCH v2 3/3] mm,hwpoison: add kill_accessing_process() to find error virtual address Message-ID: <20210419114353.3fdeb3ba@alex-virtual-machine> In-Reply-To: <20210419023658.GA1962954@u2004> References: <20210412224320.1747638-1-nao.horiguchi@gmail.com> <20210417134751.0bee9e73@alex-virtual-machine> <20210419010955.GA17180@hori.linux.bs1.fc.nec.co.jp> <20210419023658.GA1962954@u2004> Organization: kingsoft X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.30; 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identity=mailfrom; envelope-from=""; helo=mail.kingsoft.com; client-ip=114.255.44.146 X-HE-DKIM-Result: none/none X-HE-Tag: 1618803817-88734 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 19 Apr 2021 11:36:58 +0900 Naoya Horiguchi wrote: > > > 2. In the function hwpoison_pte_range(): > > > if (pfn <= hwp->pfn && hwp->pfn < pfn + PMD_SIZE) this check seem we should use PMD_SIZE/PAGE_SIZE or some macro like this? > > > > Thanks, that's right. HPAGE_PMD_NR seems to fit here. > > We also need "#ifdef CONFIG_TRANSPARENT_HUGEPAGE" to use it. > > I found that the #ifdef is not necessary because the whole > "if (ptl)" is compiled out. So I don't add #ifdef. > > Here's the v2 of 3/3. > > Aili, could you test with it? > > Thanks, > Naoya Horiguchi > I tested this v2 version, In my test, this patches worked as expected and the previous issues didn't happen again. Test-by: Aili Yao Thanks, Aili Yao > ----- > From: Naoya Horiguchi > Date: Tue, 13 Apr 2021 07:26:25 +0900 > Subject: [PATCH v2 3/3] mm,hwpoison: add kill_accessing_process() to find error > virtual address > > The previous patch solves the infinite MCE loop issue when multiple > MCE events races. The remaining issue is to make sure that all threads > processing Action Required MCEs send to the current processes the > SIGBUS with the proper virtual address and the error size. > > This patch suggests to do page table walk to find the error virtual > address. If we find multiple virtual addresses in walking, we now can't > determine which one is correct, so we fall back to sending SIGBUS in > kill_me_maybe() without error info as we do now. This corner case needs > to be solved in the future. > > Signed-off-by: Naoya Horiguchi > --- > change log v1 -> v2: > - initialize local variables in check_hwpoisoned_entry() and > hwpoison_pte_range() > - fix and improve logic to calculate error address offset. > --- > arch/x86/kernel/cpu/mce/core.c | 13 ++- > include/linux/swapops.h | 5 ++ > mm/memory-failure.c | 147 ++++++++++++++++++++++++++++++++- > 3 files changed, 161 insertions(+), 4 deletions(-) >