Re: [PATCH v3 3/4] content: Introduce driver/device auxiliary notifications for MMIO

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

On Thu, Oct 27, 2022 at 05:27:28PM -0400, Stefan Hajnoczi wrote:
> On Fri, Oct 07, 2022 at 05:56:42PM +0100, Usama Arif wrote:
> > This includes the additions to the corresponding device and driver
> > conformances.
> > 
> > Signed-off-by: Usama Arif <usama.arif@bytedance.com>
> > Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> 
> You can keep this. One thought:
> 
> I realized that virtio-mmio support won't be very useful until
> virtio-mmio gets MSI-X support because drivers currently cannot
> differentiate between device auxiliary notifications.
> 
> Stefan


The big issue with MSI is it actually needs a ton of registers
for interrupt rebalancing, masking etc and they need to be fast.
Maybe a status bit like pci has makes sense here.

-- 
MST