linux-kernel - Re: [PATCH] kvm: notify host when guest paniced

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Message-ID: <4F4DF749.7060507@redhat.com>
Date:	Wed, 29 Feb 2012 12:00:41 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Wen Congyang <wency@...fujitsu.com>,
	kvm list <kvm@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	linux-kernel@...r.kernel.org, qemu-devel <qemu-devel@...gnu.org>
Subject: Re: [PATCH] kvm: notify host when guest paniced

On 02/29/2012 11:55 AM, Gleb Natapov wrote:
> > >
> > 
> > How about using a virtio-serial channel for this?  You can transfer any
> > amount of information (including the dump itself).
> > 
> Isn't it unreliable after the guest panicked? 

So is calling hypercalls, or dumping, or writing to the screen.  Of
course calling a hypercall is simpler and so is more reliable.

> Having special kdump
> kernel that transfers dump to a host via virtio-serial channel though
> sounds interesting. May be that's what you mean.

Yes.  The "panic, starting dump" signal should be initiated by the
panicking kernel though, in case the dump fails.

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

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