linux-kernel - Re: [RFC 2/4] arm64: kexec: fix kvm issue

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Date:	Tue, 24 Mar 2015 08:46:31 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Geoff Levand <geoff@...radead.org>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"david.griego@...aro.org" <david.griego@...aro.org>,
	"freddy77@...il.com" <freddy77@...il.com>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 2/4] arm64: kexec: fix kvm issue

On 23/03/15 15:56, Geoff Levand wrote:
> On Mon, 2015-03-23 at 20:53 +0900, AKASHI Takahiro wrote:
>> The current kvm implementation keeps EL2 vector table installed even
>> when the system is shut down. This prevents kexec from putting the system
>> with kvm back into EL2 when starting a new kernel.
> 
> This is a kvm bug fix, so I think the subject should
> be something like 'arm64/kvm: Fix shutdown issue'.

Not quite. On its own, this doesn't fix anything in KVM. It simply plugs
a deficiency in the arm64 kexec implementation. If you want to be
completely true to the content of the patch, it should read:

"arm64: KVM: Allow EL2 context to be reset on shutdown"

Can we now drop the blame game and get back to the actual code?

Thanks,

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