linux-kernel - Re: [RFC v2 0/5] arm64: kvm: reset hyp context for kexec

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Date:	Fri, 27 Mar 2015 15:37:04 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Kyle McMartin <kmcmarti@...hat.com>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"geoff@...radead.org" <geoff@...radead.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"david.griego@...aro.org" <david.griego@...aro.org>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"freddy77@...il.com" <freddy77@...il.com>
Subject: Re: [RFC v2 0/5] arm64: kvm: reset hyp context for kexec

On 27/03/15 15:31, Kyle McMartin wrote:
> On Thu, Mar 26, 2015 at 05:25:21PM +0900, AKASHI Takahiro wrote:
>> 1) Call kvm_cpu_reset() on non-boot cpus in reboot notifier
>>    We don't have to do so in kexec-specific case. But the current code runs
>>    the function on each cpu for safety since we use a general reboot hook.
>> 2) Flush D$ in kvm_cpu_reset()
>>    Currently doesn't do so because all the cpus are just going to shut down,
>>    and we actually flush D$ on boot cpu in Geoff's cpu_reset().
>> 3) Compatibility with arm implementation
>>    Frediano[2] is no longer working on this issue on arm as he left his
>>    company. But my approach here is based on a generic interface and can be
>>    applied to arm in a similar way.
>>
> 
> i'm hitting this when rebooting with your patchset applied...
> 
> Rebooting.
> [  236.260863] Kernel panic - not syncing: HYP panic:
> [  236.260863] PS:600003c9 PC:000003ffffff0830 ESR:0000000096000006

It would be interesting if you could find out what you have at offset
0x830 of hyp-init.o (the stack trace is for EL1, and is not going to
help much).

Thanks,

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