Re: [PATCH v11 04/10] admin: introduce virtio admin virtqueues

[Stefan Hajnoczi <stefanha@redhat.com>]

On Mon, Apr 03, 2023 at 11:03:23AM -0400, Michael S. Tsirkin wrote:
> The admin virtqueues will be the first interface used to issue admin commands.
> 
> Currently the virtio specification defines control virtqueue to manipulate
> features and configuration of the device it operates on:
> virtio-net, virtio-scsi, etc all have existing control virtqueues. However,
> control virtqueue commands are device type specific, which makes it very
> difficult to extend for device agnostic commands.
> 
> Keeping the device-specific virtqueue separate from the admin virtqueue
> is simpler and has fewer potential problems. I don't think creating
> common infrastructure for device-specific control virtqueues across
> device types worthwhile or within the scope of this patch series.
> 
> To support this requirement in a more generic way, this patch introduces
> a new admin virtqueue interface.
> The admin virtqueue can be seen as the virtqueue analog to a transport.
> The admin queue thus does nothing device type-specific (net, scsi, etc)
> and instead focuses on transporting the admin commands.
> 
> We also support more than one admin virtqueue, for QoS and
> scalability requirements.
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> 
> ---
> explain ordering of commands as suggested by Stefan
> dropped Max's S.O.B
> reword commit log as suggested by David
> minor wording fixes suggested by David
> ---
>  admin.tex   | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>  content.tex |  7 +++--
>  2 files changed, 80 insertions(+), 2 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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