Re: [virtio-dev] Re: [PATCH v2 4/5] virtio-mmio: add MSI interrupt feature support

[Michael S. Tsirkin]

On Wed, Feb 12, 2020 at 05:03:00PM +0800, Jason Wang wrote:
> 
> On 2020/2/11 下午10:00, Michael S. Tsirkin wrote:
> > > Yes, it can work but it may bring extra effort when you want to mask a
> > > vector which is was shared by a lot of queues.
> > > 
> > > Thanks
> > > 
> > masking should be per vq too.
> > 
> > -- 
> 
> 
> Yes, but if the vector is shard by e.g 16 queues, then all those virtqueues
> needs to be masked which is expensive.
> 
> Thanks

I think that's ok - masking is rare. in fact if vectors can be
changed atomically I'm no longer sure they are needed,
maybe a destructive "disable" which can lose interrupts
is enough.

-- 
MST