From patchwork Wed May 17 15:23:35 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 9731451 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 C6F3B602DB for ; Wed, 17 May 2017 15:24:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B82B8287C1 for ; Wed, 17 May 2017 15:24:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id ACCD5287CA; Wed, 17 May 2017 15:24:53 +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 3F420287C1 for ; Wed, 17 May 2017 15:24:53 +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=DK8ODPT6ITLzx8Z2mSkXu2bQNGnKJIYyIsuQCJPKo08=; b=ujwfCW4rsP2xKffcbbXuKhRFjn KgxPfxUB7S1XzJ0KEKGZUhhs/uMidLSpviKnG9QRTQqhlRkhRftpgtuhUAPwOvSHbhc3DjsQF2CJd Bdbyqy9G3mIg3jNIeCQ7bELsobk+YVQecIfJEfPfODFqVBwiNclSmrzkv1e/IN8KAnaKiW9bM1eaZ cdDN0ilVDhiYdhn4KUbo98YH3ynaj+wAk1/5zSDEpkyYGhsn7qvafTEAaQ/5tW44Tirkc+x/1Ena4 k6PCEIa5fzoIj/QAxxJfnpaAjK57/bFQXXkJUajHhVuFljBmB0Tr2nRDQZsT/WHKZxEuxVN2eohsr MCxm2Shg==; 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 1dB0om-0002al-5U; Wed, 17 May 2017 15:24:52 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dB0oZ-0001xO-JO for linux-arm-kernel@lists.infradead.org; Wed, 17 May 2017 15:24:43 +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 CF8681435; Wed, 17 May 2017 08:24:20 -0700 (PDT) Received: from localhost (e105922-lin.cambridge.arm.com [10.1.207.56]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9F4EE3F41F; Wed, 17 May 2017 08:24:20 -0700 (PDT) From: Punit Agrawal To: catalin.marinas@arm.com, will.deacon@arm.com Subject: [PATCH v2 2/3] arm64: hwpoison: add VM_FAULT_HWPOISON[_LARGE] handling Date: Wed, 17 May 2017 16:23:35 +0100 Message-Id: <20170517152336.6052-3-punit.agrawal@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170517152336.6052-1-punit.agrawal@arm.com> References: <20170517152336.6052-1-punit.agrawal@arm.com> X-ARM-No-Footer: FoSSMail X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170517_082440_435661_6FC140C1 X-CRM114-Status: GOOD ( 13.12 ) 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 , steve.capper@arm.com, tbaicar@codeaurora.org, linux-kernel@vger.kernel.org, "Jonathan \(Zhixiong\) Zhang" , linux-arm-kernel@lists.infradead.org, manoj.iyer@canonical.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 (fix new __do_user_fault call-site) Signed-off-by: Punit Agrawal Acked-by: Steve Capper --- 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 37b95dff0b07..a85b44343ac6 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -239,10 +240,11 @@ 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; const struct fault_info *inf; + unsigned int lsb = 0; if (unhandled_signal(tsk, sig) && show_unhandled_signals_ratelimited()) { inf = esr_to_fault_info(esr); @@ -259,6 +261,17 @@ 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); } @@ -274,7 +287,7 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re */ if (user_mode(regs)) { inf = esr_to_fault_info(esr); - __do_user_fault(tsk, addr, esr, inf->sig, inf->code, regs); + __do_user_fault(tsk, addr, esr, inf->sig, inf->code, regs, 0); } else __do_kernel_fault(mm, addr, esr, regs); } @@ -461,6 +474,9 @@ 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 @@ -471,7 +487,7 @@ 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: