linux-kernel - Re: [RFC 0/2] virtio: provide a way for host to monitor critical events in the device

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Message-ID: <500E9479.3050405@gmail.com>
Date:	Tue, 24 Jul 2012 14:26:33 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	rusty@...tcorp.com.au, mst@...hat.com, penberg@...nel.org,
	asias.hejun@...il.com, virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, avi@...hat.com,
	anthony@...emonkey.ws, wency@...fujitsu.com
Subject: Re: [RFC 0/2] virtio: provide a way for host to monitor critical
 events in the device

On 07/24/2012 09:44 AM, Gleb Natapov wrote:
> On Mon, Jul 23, 2012 at 10:32:39PM +0200, Sasha Levin wrote:
>> As it was discussed recently, there's currently no way for the guest to notify
>> the host about panics. Further more, there's no reasonable way to notify the
>> host of other critical events such as an OOM kill.
>>
>> This short patch series introduces a new device named virtio-notifier which
>> does two simple things:
>>
>>  1. Provide a simple interface for the guest to notify the host of critical
> To get early OOPSes virtio will have to be compiled into the kernel. If
> your are so keen on using virtio for this though, why not just use
> dedicated virtio serial channel?

Let's separate between having log for these events and receiving notifications about them.

For the log part, I can already run a simple serial console to dump everything somewhere. I'm more concerned about having notifications about something critical happening when the guest is already up and running.


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