Re: [virtio-comment] Question regarding packed ring Virtio 1.1 feature

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

On Thu, Nov 21, 2019 at 08:40:29AM -0500, Yuri Benditovich wrote:
> Hi,
> 
> From the spec it looks like the device must maintain backward compatibility
> with Virt 1.0 split queue implementation and use the packed one only when
> negotiated.
> What is the rational of such limitation, especially in case of true hardware
> device?
> 
> Thanks,
> Yuri Benditovich


I don't think that's intentional. Any device without a split queue
implementation will fail negotiation if PACKED_RING has not been
negotiated. It's more of a SHOULD since split ring support
allows backwards compatibility with deployed software.

-- 
MST


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