From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Christophe Leroy <christophe.leroy@c-s.fr>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Serge Belyshev <belyshev@depni.sinp.msu.ru>,
Segher Boessenkool <segher@kernel.crashing.org>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] powerpc/32s: fix BATs setting with CONFIG_STRICT_KERNEL_RWX
Date: Fri, 3 May 2019 17:05:52 +1000 (AEST) [thread overview]
Message-ID: <44wNSw6lq0z9sD4@ozlabs.org> (raw)
In-Reply-To: <09733bd9d90f2ab9dfee9838442e0bea01df194d.1556640535.git.christophe.leroy@c-s.fr>
On Tue, 2019-04-30 at 16:11:59 UTC, Christophe Leroy wrote:
> Serge reported some crashes with CONFIG_STRICT_KERNEL_RWX enabled
> on a book3s32 machine.
>
> Analysis shows two issues:
> - BATs addresses and sizes are not properly aligned.
> - There is a gap between the last address covered by BATs and the
> first address covered by pages.
>
> Memory mapped with DBATs:
> 0: 0xc0000000-0xc07fffff 0x00000000 Kernel RO coherent
> 1: 0xc0800000-0xc0bfffff 0x00800000 Kernel RO coherent
> 2: 0xc0c00000-0xc13fffff 0x00c00000 Kernel RW coherent
> 3: 0xc1400000-0xc23fffff 0x01400000 Kernel RW coherent
> 4: 0xc2400000-0xc43fffff 0x02400000 Kernel RW coherent
> 5: 0xc4400000-0xc83fffff 0x04400000 Kernel RW coherent
> 6: 0xc8400000-0xd03fffff 0x08400000 Kernel RW coherent
> 7: 0xd0400000-0xe03fffff 0x10400000 Kernel RW coherent
>
> Memory mapped with pages:
> 0xe1000000-0xefffffff 0x21000000 240M rw present dirty accessed
>
> This patch fixes both issues. With the patch, we get the following
> which is as expected:
>
> Memory mapped with DBATs:
> 0: 0xc0000000-0xc07fffff 0x00000000 Kernel RO coherent
> 1: 0xc0800000-0xc0bfffff 0x00800000 Kernel RO coherent
> 2: 0xc0c00000-0xc0ffffff 0x00c00000 Kernel RW coherent
> 3: 0xc1000000-0xc1ffffff 0x01000000 Kernel RW coherent
> 4: 0xc2000000-0xc3ffffff 0x02000000 Kernel RW coherent
> 5: 0xc4000000-0xc7ffffff 0x04000000 Kernel RW coherent
> 6: 0xc8000000-0xcfffffff 0x08000000 Kernel RW coherent
> 7: 0xd0000000-0xdfffffff 0x10000000 Kernel RW coherent
>
> Memory mapped with pages:
> 0xe0000000-0xefffffff 0x20000000 256M rw present dirty accessed
>
> Reported-by: Serge Belyshev <belyshev@depni.sinp.msu.ru>
> Fixes: 63b2bc619565 ("powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX")
> Cc: stable@vger.kernel.org
> Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/12f363511d47f86c49b7766c349989cb
cheers
prev parent reply other threads:[~2019-05-03 7:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 16:11 Christophe Leroy
2019-05-01 0:55 ` Michael Ellerman
2019-05-01 17:22 ` christophe leroy
2019-05-03 7:05 ` Michael Ellerman [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=44wNSw6lq0z9sD4@ozlabs.org \
--to=patch-notifications@ellerman.id.au \
--cc=belyshev@depni.sinp.msu.ru \
--cc=benh@kernel.crashing.org \
--cc=christophe.leroy@c-s.fr \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=paulus@samba.org \
--cc=segher@kernel.crashing.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®