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: <87haswptgq.fsf@rustcorp.com.au>
Date:	Wed, 25 Jul 2012 10:06:37 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Sasha Levin <levinsasha928@...il.com>, dlaor@...hat.com
Cc:	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,
	"Peter Maydell" <peter.maydell@...aro.org>,
	"Amit Shah" <amit.shah@...hat.com>
Subject: Re: [RFC 0/2] virtio: provide a way for host to monitor critical events in the device

On Tue, 24 Jul 2012 15:01:59 +0200, Sasha Levin <levinsasha928@...il.com> wrote:
> virtio on it's own was introduced to help solve the fragmentation
> around virtualized devices, so I don't think that the main purpose of
> doing virtio drivers is due to any performance benefits virtio may
> provide.

There's one argument in your favor (with my Linaro hat on): ARM wants a
virtio reboot button, which would look remarkably similar.  There's no
standard ARM hardware for this.

So a more generalized virtio-event device might make sense.  But there
are almost an infinite number of guest events we might want: panics,
oom, low memory, stuck devices, deadlock, etc, etc.  I'm concerned about
trying to standardize them.  If we include a unspecified free-form
string, people will end up relying on the contents.  If we add a feature
bit for every new event, we'll end up running out of feature bits :)

CC'ing Amit for opinion over how much of this should be done via
virtio-serial.

Cheers,
Rusty.
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