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Date: Wed, 21 Mar 2012 19:17:49 +0100
From: Jan Kiszka <jan.kiszka@siemens.com>
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To: Avi Kivity <avi@redhat.com>
CC: "Daniel P. Berrange" <berrange@redhat.com>,
        "minyard@acm.org" <minyard@acm.org>,
        Corey Minyard <tcminyard@gmail.com>, Gleb Natapov <gleb@redhat.com>,
        Wen Congyang <wency@cn.fujitsu.com>, kvm list <kvm@vger.kernel.org>,
        qemu-devel <qemu-devel@nongnu.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 0/2 v3] kvm: notify host when guest panicked
References: <4F58664D.1070800@cn.fujitsu.com> <4F66E14F.3040809@cn.fujitsu.com> <4F6854F4.3060703@cn.fujitsu.com> <20120320154517.GG27928@redhat.com> <4F692723.8050904@cn.fujitsu.com> <20120321091127.GO22368@redhat.com> <4F69FF48.3010200@acm.org> <4F6A00EC.3060706@redhat.com> <20120321170413.GD3101@redhat.com> <4F6A1109.8060209@redhat.com>
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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

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