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=-14.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 E77F1C433E0 for ; Mon, 1 Feb 2021 10:12:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98C8064DF5 for ; Mon, 1 Feb 2021 10:12:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233104AbhBAKM6 (ORCPT ); Mon, 1 Feb 2021 05:12:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232943AbhBAKL4 (ORCPT ); Mon, 1 Feb 2021 05:11:56 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AADF4C061786 for ; Mon, 1 Feb 2021 02:10:48 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id g10so15915806wrx.1 for ; Mon, 01 Feb 2021 02:10:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=pVJj2fCNRWDjUKRwKtv4goRlFguknC7kv1PKeYxdDv0=; b=QpSF/puU9glqsBVwzcqqEmZ+yqtBGPHqZ4Wx3nKZSW0hDu5DzYxl8MFw2IAbz3QwU4 ZRV0Q1yXyYh+KJHbYdonUwJ5UhccmdjM2/4fGWbMpfGUfT5xpVV0fKN01/emB1ZaGftc pRVwankpaNsK0b/YN482tYTe/VLH4zN3eSIkSQkvAtds3EEiBSwrNfeYLpfDRMnH9CkO oag9NCeb5dor7Vy7JFf+3iroi4KkoQT7zGEfUkM+MQpuKS25jhWmaFa6HFB8NP/vL1o4 lxb4pRkykaEVegRAITjQpeMMEEpXkwUIJVcbe9yHrmVS4A+s7GEBMkCU0MDYGi/WLKnA fVhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=pVJj2fCNRWDjUKRwKtv4goRlFguknC7kv1PKeYxdDv0=; b=oY6qg5J29PzssJgfxKExTefLrB4FHwMjNzrrSsdo7BSXouaE8dzLZX8GYyf9+TQU33 38rK86cuK8//5Y3G6OTQaMRZsDI1nq27nJwiUGw+nUO4gIG87IGIfeX46BIqcLDOWzbD Hm+6f2wQeYzXf0ksBMShZxv2Bmy2ULMbmgHldIX0BhT1rRrpy5gTnrS+wFbCk6n6UskN 3zJHf8U7gX1ngwhlAPoQLKcHagNZXUwHJDvrt+2hulrChHA9jUpZHWT8HMGNu7Vmen08 jOHCDFV+ibMHjAG2aTDwZK9Ma1siRqgUsqkaQACY2djF+lb8Mk/WNuDT0LO89EpU1rQ5 V3NQ== X-Gm-Message-State: AOAM530VfyR5xKNU/+JcS9++Qwo7CZ3EHWlKd0Cr8rDHfHx6KlC9SO9g XnZnb0xV9Ivalm4TRK2fMso= X-Google-Smtp-Source: ABdhPJyUB5Ka00Ak9FmyIPy5DCcHp6v+/2ialUaMqLt+5D2jZXLZyrm6xe+A0qYitj8K6swxCuuxgw== X-Received: by 2002:a5d:4b46:: with SMTP id w6mr17343321wrs.346.1612174247504; Mon, 01 Feb 2021 02:10:47 -0800 (PST) Received: from p4 (net-93-70-85-165.cust.vodafonedsl.it. [93.70.85.165]) by smtp.gmail.com with ESMTPSA id q4sm26762945wrg.22.2021.02.01.02.10.46 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 01 Feb 2021 02:10:47 -0800 (PST) Date: Mon, 1 Feb 2021 10:10:43 +0000 From: Giancarlo Ferrari To: linux@armlinux.org.uk Cc: giancarlo.ferrari@nokia.com, michal.simek@xilinx.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ARM: kexec: Fix panic after TLB are invalidated Message-ID: <20210201101040.GC13349@p4> References: <1610470147-22641-1-git-send-email-giancarlo.ferrari89@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1610470147-22641-1-git-send-email-giancarlo.ferrari89@gmail.com> User-Agent: Mutt/1.5.24 (2015-08-30) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, On Tue, Jan 12, 2021 at 04:49:06PM +0000, Giancarlo Ferrari wrote: > machine_kexec() need to set rw permission in text and rodata sections > to assign some variables (e.g. kexec_start_address). To do that at > the end (after flushing pdm in memory, inv D-Cache, etc.) it needs to > invalidate TLB [section] entries. > > If during the TLB invalidation an interrupt occours, which might cause > a context switch, there is the risk to inject invalid TLBs, with ro > permissions. > > When trying to assign .text labels, this lead to the following issue: > > "Unable to handle kernel paging request at virtual address " > > with FSR 0x80d. > > Signed-off-by: Giancarlo Ferrari > --- > arch/arm/kernel/machine_kexec.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) has been re-submitted here: https://lore.kernel.org/lkml/1612140296-12546-1-git-send-email-giancarlo.ferrari89@gmail.com/ GF