linux-kernel - Re: [PATCH 4/5] Intel MIC Card Driver Changes for Virtio Devices.

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Message-ID: <87txje6s9p.fsf@rustcorp.com.au>
Date:	Mon, 29 Jul 2013 11:28:58 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Sudeep Dutt <sudeep.dutt@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-doc@...r.kernel.org
Cc:	Nikhil Rao <nikhil.rao@...el.com>,
	Ashutosh Dixit <ashutosh.dixit@...el.com>,
	Caz Yokoyama <Caz.Yokoyama@...el.com>,
	Dasaratharaman Chandramouli 
	<dasaratharaman.chandramouli@...el.com>,
	Harshavardhan R Kharche <harshavardhan.r.kharche@...el.com>,
	"Yaozu \(Eddie\) Dong" <eddie.dong@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Sudeep Dutt <sudeep.dutt@...el.com>
Subject: Re: [PATCH 4/5] Intel MIC Card Driver Changes for Virtio Devices.

Sudeep Dutt <sudeep.dutt@...el.com> writes:
> From: Ashutosh Dixit <ashutosh.dixit@...el.com>
>
> This patch introduces the card "Virtio over PCIe" interface for
> Intel MIC. It allows virtio drivers on the card to communicate with their
> user space backends on the host via a device page. Ring 3 apps on the host
> can add, remove and configure virtio devices. A thin MIC specific
> virtio_config_ops is implemented which is borrowed heavily from previous
> similar implementations in lguest and s390 @
> drivers/lguest/lguest_device.c
> drivers/s390/kvm/kvm_virtio.c

Wow, this is pretty cool!

Note that the lguest implementation is a bit limited, but lguest doesn't
have a real ABI, so we can simply change it if we wanted to.  I assume
you don't have that luxury.

In particular, you may want to get rid of the historical align constant,
and have explicit avail and used addresses.

Cheers,
Rusty.
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