linux-kernel - Re: [PATCH V2 3/5] ara virt interface of perf to support kvm guest os statistics collection in guest os

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Message-ID: <4C21C136.9070708@redhat.com>
Date:	Wed, 23 Jun 2010 11:09:26 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	Gleb Natapov <gleb@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Sheng Yang <sheng@...ux.intel.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com,
	tim.c.chen@...el.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH V2 3/5] ara virt interface of perf to support kvm guest
 os statistics collection in guest os

On 06/23/2010 04:43 AM, Zhang, Yanmin wrote:
>
>> A reset does not involve destroying a vm; you have to clean up as part
>> of the rest process.
>>      
> What does 'reset' here mean? Is it a reboot or halt? If it's a halt, it involves
> destroying a vm. If a host user just kills the qemu process, is it a reset involving
> destroying a vm?
>    

'reset' is either a complete reset ('system_reset' on the qemu monitor, 
cycles through the bios etc.) or just an INIT signal to one vcpu.  
Neither involves destroying a vm.

>> You aren't guaranteed a reboot notifier will be called.  On the other
>> hand, we need a kexec handler.
>>      
> ordinary kexec calls all reboot notifiers. Only crash kexec doesn't call them.
> I will implement a machine_ops.crash_shutdown callback.
>    

Thanks.

-- 
error compiling committee.c: too many arguments to function

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