From patchwork Tue Aug 28 15:51:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Thierry X-Patchwork-Id: 10578831 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A6E09139B for ; Tue, 28 Aug 2018 16:10:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 93A302A684 for ; Tue, 28 Aug 2018 16:10:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 854B52A68B; Tue, 28 Aug 2018 16:10:03 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 09E482A684 for ; Tue, 28 Aug 2018 16:10:03 +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=Xg/nbLRjdEWRWWSZE9wsmwcPESLSOCCU4HGVK4rt42E=; b=g+eT8u0OntQlzbOpbBORRBRX4Z PelPXCPHbVaaGpybgO8thEWIpgT0c2SYGQmi+iYf1HkBbwpfXsnDU/FXZqJ41XMRkUyYp86N+3ATr G9v2UPAFehEBxNsAkucPWSW/NBVMKLNzHLEOh2BqiD0c+beDf7en1+NOMWsi2bTK1a9DZpTUvglu9 JDCS9gRUXwD6RNRHe+aFaB4hI1u4vVFM2i9J3LGND2b7rHpfccFFAUPtg5e4frUHJnQgek3L+pRVn ip4aUDO0QwtsDaatLHf/5JLaqDtu6Zebl7l3pUutazT/DB3L91miwUH1dxyfdm9uPMieGzuMBAr5M sEiGOjQg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fugYy-0007yv-Ut; Tue, 28 Aug 2018 16:09:52 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fugIY-0005RY-Sd for linux-arm-kernel@lists.infradead.org; Tue, 28 Aug 2018 15:53:04 +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 927B2174E; Tue, 28 Aug 2018 08:52:42 -0700 (PDT) Received: from e112298-lin.Emea.Arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 80CC23F557; Tue, 28 Aug 2018 08:52:40 -0700 (PDT) From: Julien Thierry To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 23/27] arm64: Handle serror in NMI context Date: Tue, 28 Aug 2018 16:51:33 +0100 Message-Id: <1535471497-38854-24-git-send-email-julien.thierry@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1535471497-38854-1-git-send-email-julien.thierry@arm.com> References: <1535471497-38854-1-git-send-email-julien.thierry@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180828_085255_111485_5B7C9F65 X-CRM114-Status: GOOD ( 10.68 ) 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: mark.rutland@arm.com, daniel.thompson@linaro.org, Julien Thierry , marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, christoffer.dall@arm.com, james.morse@arm.com, joel@joelfernandes.org, Dave Martin 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 Per definition of the daifflags, Serrors can occur during any interrupt context, that includes NMI contexts. Trying to nmi_enter in an nmi context will crash. Skip nmi_enter/nmi_exit when serror occurred during an NMI. Suggested-by: James Morse Signed-off-by: Julien Thierry Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: Dave Martin Cc: James Morse --- arch/arm64/kernel/traps.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 039e9ff..4955ec6 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -713,13 +713,17 @@ bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr) asmlinkage void do_serror(struct pt_regs *regs, unsigned int esr) { - nmi_enter(); + const bool was_in_nmi = in_nmi(); + + if (!was_in_nmi) + nmi_enter(); /* non-RAS errors are not containable */ if (!arm64_is_ras_serror(esr) || arm64_is_fatal_ras_serror(regs, esr)) arm64_serror_panic(regs, esr); - nmi_exit(); + if (!was_in_nmi) + nmi_exit(); } void __pte_error(const char *file, int line, unsigned long val)