From: Michael Ellerman <mpe@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>, linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
Sourabh Jain <sourabhjain@linux.ibm.com>
Subject: Re: [PATCH] powerpc/pseries: Fix scv instruction crash with kexec
Date: Wed, 26 Jun 2024 19:27:45 +1000 [thread overview]
Message-ID: <87sex0oxym.fsf@mail.lhotse> (raw)
In-Reply-To: <20240625134047.298759-1-npiggin@gmail.com>
Nicholas Piggin <npiggin@gmail.com> writes:
> kexec on pseries disables AIL (reloc_on_exc), required for scv
> instruction support, before other CPUs have been shut down. This means
> they can execute scv instructions after AIL is disabled, which causes an
> interrupt at an unexpected entry location that crashes the kernel.
>
> Change the kexec sequence to disable AIL after other CPUs have been
> brought down.
>
> As a refresher, the real-mode scv interrupt vector is 0x17000, and the
> fixed-location head code probably couldn't easily deal with implementing
> such high addresses so it was just decided not to support that interrupt
> at all.
>
> Reported-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Was this reported publicly? I don't remember it.
cheers
next prev parent reply other threads:[~2024-06-26 9:28 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-25 13:40 [PATCH] powerpc/pseries: Fix scv instruction crash with kexec Nicholas Piggin
2024-06-26 9:27 ` Michael Ellerman [this message]
2024-06-26 9:46 ` Sourabh Jain
2024-06-28 12:01 ` Michael Ellerman
2024-06-26 9:40 ` Gautam Menghani
2024-07-01 4:16 ` Sourabh Jain
2024-07-06 22:49 ` Michael Ellerman
2024-07-09 10:53 ` Michal Suchánek
2024-07-09 13:03 ` Michael Ellerman
2024-07-09 13:10 ` Michal Suchánek
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