From: Rusty Russell <rusty@rustcorp.com.au>
Date: Tue, 5 Feb 2008 04:50:03 +0000 (-0500)
Subject: virtio: reset function
X-Git-Tag: v2.6.25-rc1~1058^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e5aa7efb27aec7e55b6463fa2c8db594c4226fa;p=pandora-kernel.git

virtio: reset function

A reset function solves three problems:

1) It allows us to renegotiate features, eg. if we want to upgrade a
   guest driver without rebooting the guest.

2) It gives us a clean way of shutting down virtqueues: after a reset,
   we know that the buffers won't be used by the host, and

3) It helps the guest recover from messed-up drivers.

So we remove the ->shutdown hook, and the only way we now remove
feature bits is via reset.

We leave it to the driver to do the reset before it deletes queues:
the balloon driver, for example, needs to chat to the host in its
remove function.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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