Re: [PATCH untested] virtio: allocate extra memory before the ring ( was Re: [RFC PATCH] virtio_console: link vq to port with a private) pointer in struct virtqueue

From: Paolo Bonzini
Date: Tue May 08 2012 - 07:06:05 EST

> And it's not a problem if virtqueue is exactly at start of
> vring_virtqueue: we just need to allocate a bit more at start, and
> offset when we free. Here's how I would do this: first apply patch
> below that adds the offset parameter, then update all transports, one
> patch at a time to not use priv pointer, finally you can repurpose
> priv pointer to let devices use it.

I like it, though I prefer to have the new arguments as sizeof()
rather than offsets.

I'll pick up this and test it.

> As a bonus we get small incremental patches.

FWIW, that's possible with the patch I posted too.

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