On Thu, Sep 26, 2019 at 09:26:22AM -0400, Michael S. Tsirkin wrote:

On Thu, Sep 26, 2019 at 09:14:39PM +0800, Tiwei Bie wrote:

quoted

quoted

4. Does device need to limit max ring size?
5. Does device need to limit max number of queues?

I think so. It's helpful to have ioctls to report the max
ring size and max number of queues.

Also, let's not repeat the vhost net mistakes, let's lock
everything to the order required by the virtio spec,
checking status bits at each step.
E.g.:
	set backend features
	set features
	detect and program vqs
	enable vqs
	enable driver

and check status at each step to force the correct order.
e.g. don't allow enabling vqs after driver ok, etc

Got it. Thanks a lot!

Regards,
Tiwei

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MST