From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Laurent Vivier <lvivier@redhat.com>, David Gibson <dgibson@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
thuth@redhat.com
Subject: Re: [PATCH] powerpc: on crash, kexec'ed kernel needs all CPUs are online
Date: Sat, 17 Oct 2015 07:33:53 +0530 [thread overview]
Message-ID: <1445047433.24309.40.camel@kernel.crashing.org> (raw)
In-Reply-To: <5620ADE4.9060701@redhat.com>
On Fri, 2015-10-16 at 09:57 +0200, Laurent Vivier wrote:
> For me the problem is: as these CPUs are offline, I guess the core has
> been switched to 1 thread per core, so the CPUs (1 to 7 for core 0)
> don't exist anymore, how can we return them to OPAL ?
Another option is to make the new kernel kick_cpu fallback, if it knows
it's coming as a crashdump, to sending IPIs.
We would need some sane way to catch the guys coming it at 0x100 and
route the to secondary start.
Cheers,
Ben.
next prev parent reply other threads:[~2015-10-17 2:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-15 19:00 [PATCH] powerpc: on crash, kexec'ed kernel needs all CPUs are online Laurent Vivier
2015-10-16 0:27 ` kbuild test robot
2015-10-16 2:14 ` Michael Ellerman
2015-10-16 7:48 ` Laurent Vivier
2015-10-17 2:01 ` Benjamin Herrenschmidt
2015-10-16 2:29 ` David Gibson
2015-10-16 7:57 ` Laurent Vivier
2015-10-17 2:03 ` Benjamin Herrenschmidt [this message]
2015-11-04 12:34 ` Hari Bathini
2015-11-04 13:54 ` Laurent Vivier
2015-11-05 1:32 ` David Gibson
2015-11-05 6:59 ` Stewart Smith
2015-11-05 10:23 ` Hari Bathini
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