linux-kernel - Re: [PATCH RFC 1/5] vringfd syscall

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Message-ID: <12555.1207590874@vena.lwn.net>
Date:	Mon, 07 Apr 2008 11:54:34 -0600
From:	corbet@....net (Jonathan Corbet)
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	Max Krasnyansky <maxk@...lcomm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/5] vringfd syscall 

Hey, Rusty,

> For virtualization, we've developed virtio_ring for efficient communication.
> This would also work well for userspace-kernel communication, particularly
> for things like the tun device.  By using the same ABI, we can join guests
> to the host kernel trivially.

I'm *sure* you meant to document that somewhat non-trivial proposed new
kernel API as soon as you got a moment.  But, since I went to the
trouble of reverse engineering it, I decided not to wait and to make a
little unreliable guide of my own.  For those who are curious about how
vringfd() is meant to work (or about how badly I misunderstood it), the
info is at:

	http://lwn.net/SubscriberLink/276856/8c927025c53ad7ce/

Hopefully it will be helpful,

jon
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