From: Giancarlo Ferrari <giancarlo.ferrari89@gmail.com>
To: linux@armlinux.org.uk
Cc: linux-kernel@vger.kernel.org, michal.simek@xilinx.com,
linux-arm-kernel@lists.infradead.org,
giancarlo.ferrari@nokia.com
Subject: Re: [PATCH] ARM: kexec: Fix panic after TLB are invalidated
Date: Mon, 1 Feb 2021 10:10:43 +0000 [thread overview]
Message-ID: <20210201101040.GC13349@p4> (raw)
In-Reply-To: <1610470147-22641-1-git-send-email-giancarlo.ferrari89@gmail.com>
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 <valid_addr>"
>
> with FSR 0x80d.
>
> Signed-off-by: Giancarlo Ferrari <giancarlo.ferrari89@gmail.com>
> ---
> 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
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next prev parent reply other threads:[~2021-02-01 10:31 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 16:49 [PATCH] ARM: kexec: Fix panic after TLB are invalidated Giancarlo Ferrari
2021-02-01 10:10 ` Giancarlo Ferrari [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-02-01 0:44 Giancarlo Ferrari
2021-02-01 11:34 ` Russell King - ARM Linux admin
2021-02-01 12:47 ` Mark Rutland
2021-02-01 13:03 ` Russell King - ARM Linux admin
2021-02-01 13:57 ` Mark Rutland
2021-02-01 16:08 ` Russell King - ARM Linux admin
2021-02-01 16:32 ` Mark Rutland
2021-02-01 16:37 ` Russell King - ARM Linux admin
2021-02-01 20:07 ` Giancarlo Ferrari
2021-02-01 20:16 ` Russell King - ARM Linux admin
2021-02-01 22:18 ` Giancarlo Ferrari
2021-02-04 23:48 ` Giancarlo Ferrari
2021-02-05 0:18 ` Russell King - ARM Linux admin
2021-02-05 0:40 ` Giancarlo Ferrari
2021-02-05 0:45 ` Giancarlo Ferrari
2021-02-05 9:44 ` Russell King - ARM Linux admin
2021-02-05 14:36 ` Giancarlo Ferrari
2021-02-01 14:39 ` Giancarlo Ferrari
2021-02-01 15:30 ` Mark Rutland
2021-02-01 19:09 ` Giancarlo Ferrari
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