Re: [PATCH 1/2] virtio: introduce selective queue enabling

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Jun 06, 2023 at 07:55:10PM +0200, Eugenio Pérez wrote:
> This patch allows the driver to start the device (as set DRIVER_OK) with only
> some queues enabled, and then enable another queues later.
> 
> This is the current way to migrate net device state through control
> virtqueue, in a software assisted framework with vDPA:
> * First, only net CVQ is enabled at DRIVER_OK
> * All the control commands (mac address, mq, etc) needed for the device
> to behave the same as the source of migration are sent
> * Finally all the dataplane queues are enabled.
> 
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>


I realized I never asked. *Why* enable CVQ so early?
I think it's so that commands take effect before any
buffers are processed? So maybe it's a net specific
issue?

-- 
MST