From: Aaro Koskinen <aaro.koskinen@iki.fi>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [BISECTED] kexec regression on PowerBook G4
Date: Fri, 24 May 2019 01:23:44 +0300 [thread overview]
Message-ID: <20190523222344.GC5234@darkstar.musicnaut.iki.fi> (raw)
In-Reply-To: <dc24cfa0-cefa-3245-a9aa-5493b094ffac@c-s.fr>
Hi,
On Thu, May 23, 2019 at 08:58:11PM +0200, Christophe Leroy wrote:
> Le 23/05/2019 à 19:27, Aaro Koskinen a écrit :
> >On Thu, May 23, 2019 at 07:33:38AM +0200, Christophe Leroy wrote:
> >>Ok, the Oops confirms that the error is due to executing the kexec control
> >>code which is located outside the kernel text area.
> >>
> >>My yesterday's proposed change doesn't work because on book3S/32, NX
> >>protection is based on setting segments to NX, and using IBATs for kernel
> >>text.
> >>
> >>Can you try the patch I sent out a few minutes ago ?
> >>(https://patchwork.ozlabs.org/patch/1103827/)
> >
> >It now crashes with "BUG: Unable to handle kernel instruction fetch"
> >and the faulting address is 0xef13a000.
>
> Ok.
>
> Can you try with both changes at the same time, ie the mtsrin(...) and the
> change_page_attr() ?
>
> I suspect that allthough the HW is not able to check EXEC flag, the SW will
> check it before loading the hash entry.
Unfortunately still no luck... The crash is pretty much the same with both
changes.
A.
next prev parent reply other threads:[~2019-05-23 22:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-21 22:18 [BISECTED] kexec regression on PowerBook G4 Aaro Koskinen
2019-05-22 6:14 ` Christophe Leroy
2019-05-22 7:44 ` Christophe Leroy
2019-05-22 20:13 ` Aaro Koskinen
2019-05-22 20:33 ` LEROY Christophe
[not found] ` <20190522211724.GC456@darkstar.musicnaut.iki.fi>
2019-05-23 5:24 ` [RFC PATCH] powerpc: fix kexec failure on book3s/32 Christophe Leroy
2019-05-23 5:33 ` [BISECTED] kexec regression on PowerBook G4 Christophe Leroy
2019-05-23 17:27 ` Aaro Koskinen
2019-05-23 18:58 ` Christophe Leroy
2019-05-23 22:23 ` Aaro Koskinen [this message]
2019-05-24 5:46 ` Christophe Leroy
2019-05-24 6:08 ` Christophe Leroy
2019-05-24 7:36 ` Aaro Koskinen
2019-05-24 7:40 ` Christophe Leroy
2019-05-24 13:29 ` Aaro Koskinen
2019-05-24 13:35 ` Christophe Leroy
2019-05-24 6:05 ` [RFC PATCH v2] powerpc: fix kexec failure on book3s/32 Christophe Leroy
2019-05-24 13:38 ` Christophe Leroy
2019-05-22 20:07 ` [BISECTED] kexec regression on PowerBook G4 Aaro Koskinen
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