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

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Date:	Tue, 24 Jul 2012 14:25:44 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Sasha Levin <levinsasha928@...il.com>, mst@...hat.com,
	penberg@...nel.org, asias.hejun@...il.com
Cc:	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org, avi@...hat.com,
	anthony@...emonkey.ws, wency@...fujitsu.com,
	Sasha Levin <levinsasha928@...il.com>
Subject: Re: [RFC 0/2] virtio: provide a way for host to monitor critical events in the device

On Mon, 23 Jul 2012 22:32:39 +0200, Sasha Levin <levinsasha928@...il.com> 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.

I clearly missed the discussion.  Is this actually useful?  In practice,
won't you want the log from the guest?  What makes a virtual guest
different from a physical guest?

Guest watchdog functionality might be useful, but that's simpler to
implement via a virtio watchdog device, and more effective to implement
via a host facility that actually pings guest functionality (rather than
the kernel).

Cheers,
Rusty.
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