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Date:	Mon, 6 Oct 2014 17:29:42 +0200
From:	Cornelia Huck <>
To:	"Michael S. Tsirkin" <>
Subject: Re: [PATCH v2 10/15] virtio: add API to enable VQs early

On Mon, 6 Oct 2014 18:11:16 +0300
"Michael S. Tsirkin" <> wrote:

> virtio spec 0.9.X requires DRIVER_OK to be set before
> VQs are used, but some drivers use VQs before probe
> function returns.
> Since DRIVER_OK is set after probe, this violates the spec.
> Even though under virtio 1.0 transitional devices support this
> behaviour, we want to make it possible for those early callers to become
> spec compliant and eventually support non-transitional devices.
> Add API for drivers to call before using VQs.
> Sets DRIVER_OK internally.
> Signed-off-by: Michael S. Tsirkin <>
> ---
>  include/linux/virtio_config.h | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)

Reviewed-by: Cornelia Huck <>

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