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[Xen-devel] Re: [kvm-devel] [PATCH RFC 1/3] virtio infrastructure

To: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [kvm-devel] [PATCH RFC 1/3] virtio infrastructure
From: Carsten Otte <cotte@xxxxxxxxxx>
Date: Thu, 31 May 2007 14:53:08 +0200
Cc: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Xen Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxx>, "jmk@xxxxxxxxxxxxxxxxxxx" <jmk@xxxxxxxxxxxxxxxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, kvm-devel <kvm-devel@xxxxxxxxxxxxxxxxxxxxx>, mschwid2@xxxxxxxxxxxxxxxxxx, virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Christian Borntraeger <cborntra@xxxxxxxxxx>, Suzanne McIntosh <skranjac@xxxxxxxxxx>
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Rusty Russell wrote:
This attempts to implement a "virtual I/O" layer which should allow
common drivers to be efficiently used across most virtual I/O
mechanisms.  It will no-doubt need further enhancement.

The details of probing the device are left to hypervisor-specific
code: it simple constructs the "struct virtio_device" and hands it to
the probe function (eg. virtnet_probe() or virtblk_probe()).

The virtio drivers add and detach input and output buffers; as the
buffers are used up their associated "used" pointers are filled in.

I have written two virtio device drivers (net and block) and two
virtio implementations (for lguest): a read-write socket-style
implementation, and a more efficient descriptor-based implementation).
These should work for s390 afaics. They seem to fit the requirements of network IO.

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