From patchwork Thu Mar 30 16:38:48 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 9654803 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8E4B160349 for ; Thu, 30 Mar 2017 16:41:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7FB9F285B0 for ; Thu, 30 Mar 2017 16:41:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 724E0285BE; Thu, 30 Mar 2017 16:41:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 014A7285B0 for ; Thu, 30 Mar 2017 16:41:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=0WIxaNrIt8QOcSEGGI/15r7xG1qah+a6vVcCl36h+HQ=; b=H6Ju9Ett7VPd0ah4C/C/A9raAW Gt34XNpcqWwe3zRxEfeFdEo9C/6J+fybQMHEjlFEKiiST0sIEcMzcgGNeyOmOd8g9WjyZxK2w2zop x7U0MmLh+g1lmKolG/zzvpfMg32AHDfzIkYoZQjlhn9bcWuaJ7k+j0Aghv59meNHp2ZdndPbQW1ex dsjUh6E8nstCaX92oYYO/ro8xRz5vkW2uA6ipW5WHOymWClKdceY0LQ4z9m93VOGwgmbdUGNisjEl 7nZmOTYvMj+N0t7r4bQfbpiGdYjXtLTrwXFz9s1WJoEt4S5iEmHq9Wt7Hw1WdAt2nSYGv+sf6AlYF e8EK+xlw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1ctd88-0004Ni-2J; Thu, 30 Mar 2017 16:41:00 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1ctd7C-00029j-SK for linux-arm-kernel@lists.infradead.org; Thu, 30 Mar 2017 16:40:14 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id EC2D215AB; Thu, 30 Mar 2017 09:39:43 -0700 (PDT) Received: from localhost (e105922-lin.cambridge.arm.com [10.1.195.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BDBC63F220; Thu, 30 Mar 2017 09:39:43 -0700 (PDT) From: Punit Agrawal To: catalin.marinas@arm.com, will.deacon@arm.com, akpm@linux-foundation.org Subject: [PATCH 3/4] arm64: hwpoison: add VM_FAULT_HWPOISON[_LARGE] handling Date: Thu, 30 Mar 2017 17:38:48 +0100 Message-Id: <20170330163849.18402-4-punit.agrawal@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170330163849.18402-1-punit.agrawal@arm.com> References: <20170330163849.18402-1-punit.agrawal@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170330_094003_420261_C575D1D0 X-CRM114-Status: GOOD ( 12.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Punit Agrawal , "Jonathan \(Zhixiong\) Zhang" , tbaicar@codeaurora.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, kirill.shutemov@linux.intel.com, mike.kravetz@oracle.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Jonathan (Zhixiong) Zhang" Add VM_FAULT_HWPOISON[_LARGE] handling to the arm64 page fault handler. Handling of VM_FAULT_HWPOISON[_LARGE] is very similar to VM_FAULT_OOM, the only difference is that a different si_code (BUS_MCEERR_AR) is passed to user space and si_addr_lsb field is initialized. Signed-off-by: Jonathan (Zhixiong) Zhang Signed-off-by: Tyler Baicar Signed-off-by: Punit Agrawal --- arch/arm64/mm/fault.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 4bf899fb451b..212c862b2fd0 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -194,9 +195,10 @@ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr, */ static void __do_user_fault(struct task_struct *tsk, unsigned long addr, unsigned int esr, unsigned int sig, int code, - struct pt_regs *regs) + struct pt_regs *regs, int fault) { struct siginfo si; + unsigned int lsb = 0; if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) { pr_info("%s[%d]: unhandled %s (%d) at 0x%08lx, esr 0x%03x\n", @@ -212,6 +214,17 @@ static void __do_user_fault(struct task_struct *tsk, unsigned long addr, si.si_errno = 0; si.si_code = code; si.si_addr = (void __user *)addr; + /* + * Either small page or large page may be poisoned. + * In other words, VM_FAULT_HWPOISON_LARGE and + * VM_FAULT_HWPOISON are mutually exclusive. + */ + if (fault & VM_FAULT_HWPOISON_LARGE) + lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault)); + else if (fault & VM_FAULT_HWPOISON) + lsb = PAGE_SHIFT; + si.si_addr_lsb = lsb; + force_sig_info(sig, &si, tsk); } @@ -225,7 +238,7 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re * handle this fault with. */ if (user_mode(regs)) - __do_user_fault(tsk, addr, esr, SIGSEGV, SEGV_MAPERR, regs); + __do_user_fault(tsk, addr, esr, SIGSEGV, SEGV_MAPERR, regs, 0); else __do_kernel_fault(mm, addr, esr, regs); } @@ -427,6 +440,9 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr, */ sig = SIGBUS; code = BUS_ADRERR; + } else if (fault & (VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE)) { + sig = SIGBUS; + code = BUS_MCEERR_AR; } else { /* * Something tried to access memory that isn't in our memory @@ -437,7 +453,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr, SEGV_ACCERR : SEGV_MAPERR; } - __do_user_fault(tsk, addr, esr, sig, code, regs); + __do_user_fault(tsk, addr, esr, sig, code, regs, fault); return 0; no_context: