Re: [PATCH v5 4/8] vfio: Wait for dma-buf invalidation to complete

[Jason Gunthorpe]

On Fri, Jan 30, 2026 at 03:11:48PM +0100, Christian König wrote:
> On 1/30/26 14:56, Jason Gunthorpe wrote:
> > On Fri, Jan 30, 2026 at 02:21:08PM +0100, Christian König wrote:
> > 
> >> That would work for me.
> >>
> >> Question is if you really want to do it this way? See usually
> >> exporters try to avoid blocking such functions.
> > 
> > Yes, it has to be this way, revoke is a synchronous user space
> > triggered operation around things like FLR or device close. We can't
> > defer it into some background operation like pm.
> 
> Yeah, but you only need that in a couple of use cases and not all.

Not all, that is why the dma_buf_attach_revocable() is there to
distinguish this case from others.

Jason