From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0512C10F14 for ; Sun, 6 Oct 2019 17:23:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D6BB20862 for ; Sun, 6 Oct 2019 17:23:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570382589; bh=yXB39dAJ0OPDeSOHA2m2wMUfQ/NcOLpxgJl/vscunP4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0jEIBXAYmbC6EymR7MsjpjssKCEFheciK7d7MDr+dmkJeld99j93QNZWNBtb8zWOd v6sGiVHJTQZTeZ+rAzZs2T2ahlqeYpKVOVHf5KAx/5gFsvt2F3wFlbQVX54G7saCN9 904q8QwwV4ZZvg85rkN+TtxfpDFAqpWYOej8Hb/o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726916AbfJFRXJ (ORCPT ); Sun, 6 Oct 2019 13:23:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:47492 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726508AbfJFRXH (ORCPT ); Sun, 6 Oct 2019 13:23:07 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D9C6E2077B; Sun, 6 Oct 2019 17:23:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570382587; bh=yXB39dAJ0OPDeSOHA2m2wMUfQ/NcOLpxgJl/vscunP4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lUtG3X5AgSITwFxU1XEHWdrvjmQwemTgLQFkz/lUewfl4PCzs3vdyu8n6Hude72O/ MiYjdyHwaGO1VSwbOJ/LweUfQBu0Hd38VfZHcPYH8E0MiB+1cYnCpfBHxB0S/2kcOn MJqzxI0S5b4/NitzkPBufe6Mm/525Z2NmyW3v69E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nicholas Piggin , Michael Ellerman , Sasha Levin Subject: [PATCH 4.9 14/47] powerpc/64s/exception: machine check use correct cfar for late handler Date: Sun, 6 Oct 2019 19:21:01 +0200 Message-Id: <20191006172017.639416159@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191006172016.873463083@linuxfoundation.org> References: <20191006172016.873463083@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nicholas Piggin [ Upstream commit 0b66370c61fcf5fcc1d6901013e110284da6e2bb ] Bare metal machine checks run an "early" handler in real mode before running the main handler which reports the event. The main handler runs exactly as a normal interrupt handler, after the "windup" which sets registers back as they were at interrupt entry. CFAR does not get restored by the windup code, so that will be wrong when the handler is run. Restore the CFAR to the saved value before running the late handler. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20190802105709.27696-8-npiggin@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/kernel/exceptions-64s.S | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 92474227262b4..0c8b966e80702 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -467,6 +467,10 @@ EXC_COMMON_BEGIN(machine_check_handle_early) RFI_TO_USER_OR_KERNEL 9: /* Deliver the machine check to host kernel in V mode. */ +BEGIN_FTR_SECTION + ld r10,ORIG_GPR3(r1) + mtspr SPRN_CFAR,r10 +END_FTR_SECTION_IFSET(CPU_FTR_CFAR) MACHINE_CHECK_HANDLER_WINDUP b machine_check_pSeries -- 2.20.1