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[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 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-Disposition: inline In-Reply-To: <1610470147-22641-1-git-send-email-giancarlo.ferrari89@gmail.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210201_051048_983268_F2893E8A X-CRM114-Status: GOOD ( 17.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, michal.simek@xilinx.com, linux-arm-kernel@lists.infradead.org, giancarlo.ferrari@nokia.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel