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

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Message-ID: <4F6A1B4D.2060908@siemens.com>
Date:	Wed, 21 Mar 2012 19:17:49 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Avi Kivity <avi@...hat.com>
CC:	"Daniel P. Berrange" <berrange@...hat.com>,
	"minyard@....org" <minyard@....org>,
	Corey Minyard <tcminyard@...il.com>,
	Gleb Natapov <gleb@...hat.com>,
	Wen Congyang <wency@...fujitsu.com>,
	kvm list <kvm@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

On 2012-03-21 18:34, Avi Kivity wrote:
> On 03/21/2012 07:04 PM, Daniel P. Berrange wrote:
>>>
>>> In fact the feature can be implemented 100% host side by searching for a
>>> panic string signature in the console logs.
>>
>> You can even go one better and search for the panic string in the
>> guest memory directly, which is what virt-dmesg does :-)
>>
>>   http://people.redhat.com/~rjones/virt-dmesg/
>>
> 
> -ETOOHACKY
> 
> Any guest change will break this, no?

/me has a simple python script (a few ten lines) to do this during
runtime (kgdb, qemu gdbstub) or post-portem (gdb -c vmcore). Ideally,
that will once come with the Linux sources where it can be kept in sync
with the kernel data structures.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
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