From: Will Deacon <will.deacon@arm.com>
To: Simon Horman <horms@verge.net.au>
Cc: Dave Martin <dave.martin@linaro.org>,
"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>,
Magnus Damm <magnus.damm@gmail.com>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
Frank Hofmann <frank.hofmann@tomtom.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: Possible regression in kexec on ARM ARMv6 and ARMv7 cores
Date: Fri, 21 Oct 2011 09:46:41 +0100 [thread overview]
Message-ID: <20111021084641.GA30168@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <20111021083426.GA16088@verge.net.au>
On Fri, Oct 21, 2011 at 09:34:26AM +0100, Simon Horman wrote:
> I have tested the kexec/mmu-off branch of your tree on the UP board
> I mentioned above and kexec works :)
Hurrah! Thanks for giving it a spin.
> > You mention UP in particular, which I will test.
> > Do you have any thoughts on SMP?
Yes. Currently [i.e. on my branch above] you can do SMP kexec using the CPU
hotplug platform_cpu_kill callback to take down the CPUs in some
platform-specific manner.
The more difficult case is when you want to offline the secondary CPUs into
a pen and then boot them in the new kernel. I did get some of this working,
but there are outstanding issues with whether the pen should be at a fixed
location or not. If not, then we need a way to tell the new kernel where it
is, which may involve updating the DT blob...
Will
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kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will.deacon@arm.com>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: Possible regression in kexec on ARM ARMv6 and ARMv7 cores
Date: Fri, 21 Oct 2011 08:46:41 +0000 [thread overview]
Message-ID: <20111021084641.GA30168@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <20111021083426.GA16088@verge.net.au>
On Fri, Oct 21, 2011 at 09:34:26AM +0100, Simon Horman wrote:
> I have tested the kexec/mmu-off branch of your tree on the UP board
> I mentioned above and kexec works :)
Hurrah! Thanks for giving it a spin.
> > You mention UP in particular, which I will test.
> > Do you have any thoughts on SMP?
Yes. Currently [i.e. on my branch above] you can do SMP kexec using the CPU
hotplug platform_cpu_kill callback to take down the CPUs in some
platform-specific manner.
The more difficult case is when you want to offline the secondary CPUs into
a pen and then boot them in the new kernel. I did get some of this working,
but there are outstanding issues with whether the pen should be at a fixed
location or not. If not, then we need a way to tell the new kernel where it
is, which may involve updating the DT blob...
Will
WARNING: multiple messages have this Message-ID (diff)
From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: Possible regression in kexec on ARM ARMv6 and ARMv7 cores
Date: Fri, 21 Oct 2011 09:46:41 +0100 [thread overview]
Message-ID: <20111021084641.GA30168@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <20111021083426.GA16088@verge.net.au>
On Fri, Oct 21, 2011 at 09:34:26AM +0100, Simon Horman wrote:
> I have tested the kexec/mmu-off branch of your tree on the UP board
> I mentioned above and kexec works :)
Hurrah! Thanks for giving it a spin.
> > You mention UP in particular, which I will test.
> > Do you have any thoughts on SMP?
Yes. Currently [i.e. on my branch above] you can do SMP kexec using the CPU
hotplug platform_cpu_kill callback to take down the CPUs in some
platform-specific manner.
The more difficult case is when you want to offline the secondary CPUs into
a pen and then boot them in the new kernel. I did get some of this working,
but there are outstanding issues with whether the pen should be at a fixed
location or not. If not, then we need a way to tell the new kernel where it
is, which may involve updating the DT blob...
Will
next prev parent reply other threads:[~2011-10-21 8:46 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-20 4:24 Possible regression in kexec on ARM ARMv6 and ARMv7 cores Simon Horman
2011-10-20 4:24 ` Simon Horman
2011-10-20 4:24 ` Simon Horman
2011-10-20 7:01 ` Will Deacon
2011-10-20 7:01 ` Will Deacon
2011-10-20 7:01 ` Will Deacon
2011-10-20 8:08 ` Simon Horman
2011-10-20 8:08 ` Simon Horman
2011-10-20 8:08 ` Simon Horman
2011-10-21 8:34 ` Simon Horman
2011-10-21 8:34 ` Simon Horman
2011-10-21 8:34 ` Simon Horman
2011-10-21 8:46 ` Will Deacon [this message]
2011-10-21 8:46 ` Will Deacon
2011-10-21 8:46 ` Will Deacon
2011-10-21 8:59 ` Simon Horman
2011-10-21 8:59 ` Simon Horman
2011-10-21 8:59 ` Simon Horman
2011-10-21 9:15 ` Will Deacon
2011-10-21 9:15 ` Will Deacon
2011-10-21 9:15 ` Will Deacon
2011-10-22 2:20 ` Simon Horman
2011-10-22 2:20 ` Simon Horman
2011-10-22 2:20 ` Simon Horman
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