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

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Date:	Tue, 13 Mar 2012 10:54:14 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Wen Congyang <wency@...fujitsu.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

On 03/13/2012 08:44 AM, Wen Congyang wrote:
> 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.

You can use virtio-serial with any guest that has a driver.  There are
drivers available for Windows.

> 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.
>

The hypercall implementation must exist in the hypervisor.

virtio-serial is used by the guest agent, so it's likely to be
availalble in all cloud or data center deployments.

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

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