linux-kernel - Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

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Message-ID: <4F5EECD9.8050508@cn.fujitsu.com>
Date:	Tue, 13 Mar 2012 14:44:41 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	kvm list <kvm@...r.kernel.org>, qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

At 03/12/2012 06:33 PM, Avi Kivity Wrote:
> On 03/12/2012 11:04 AM, Wen Congyang wrote:
>> Do you have any other comments about this patch?
>>
> 
> Not really, but I'm not 100% convinced the patch is worthwhile.  It's
> likely to only be used by Linux, which has kexec facilities, and you can
> put talk to management via virtio-serial and describe the crash in more
> details than a simple hypercall.

Hmm, can we use virtio-serial to talk with not-linux OS? I guess the answer
is no. If so, virtio-serial is also used by linux.

Another problem is: virtio-serial is available on many deployed versions
but the guest must have virtio-serial device. So we cannot know the guest
is panicked if it does not have virtio-serial device while the hypercall does
not depend on any device.

Thanks
Wen Congyang
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