From mboxrd@z Thu Jan  1 00:00:00 1970
From: marc.zyngier@arm.com (Marc Zyngier)
Date: Tue, 17 Nov 2015 09:07:36 +0000
Subject: A problem about interrupt when booting a captured kernel
In-Reply-To: <564A7D53.6010906@linaro.org>
References: <5645B6D3.60305@huawei.com> <564A2DE4.4030702@arm.com>
 <564A7D53.6010906@linaro.org>
Message-ID: <20151117090736.7db5e646@arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Tue, 17 Nov 2015 10:05:23 +0900
AKASHI Takahiro <takahiro.akashi@linaro.org> wrote:

> Marc,
> (Cc: Mark)
> 
> On 11/17/2015 04:26 AM, Marc Zyngier wrote:
> > On 13/11/15 10:09, Yang Yingliang wrote:
> >> Hi, Marc
> >>
> >>
> >>       The kexec will boot a captured kernel while the kernel panic. But
> >> it boots failed if the kernel panic in handler function of PPI. The
> >> reason is that the PPI has not been 'eoi', other interrupts can not be
> >> handled when booting  the captured kernel.
> >>
> >>       The kexec will call irq_eoi to end the irqs that have
> >> IRQD_IRQ_INPROGRESS flag. But PPIs don't have this flag, so it won't be
> >> ended.
> >>
> >>      Three ways to solve this problem we can think :
> >>      1. Is there a way to reset gic like its_reset ?
> >>      2. Can we add some flag for calling irq_eoi ?
> >>      3. Just 'eoi' all PPIs without checking flags in kexec.
> >>
> >>       Please give some advice.
> >
> > Good timing. Please see:
> >
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2015-November/385383.html
> 
> I removed machine_kexec_mask_interrupts() from my arm64 kdump patch series[1]
> due to the past discussions[2].
> 
> Is it the time that I should resurrect the code?

Probably.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny.