On 14.12.20 14:36, Jason Gunthorpe wrote:

On Sat, Dec 12, 2020 at 08:29:11AM +0100, David Hildenbrand wrote:

quoted

quoted

Racing with another GUP in another thread is also not reasonable, so
failing to isolate can't be a failure

Having VMs with multiple vfio containers is certainly realistic, and
optimizing in user space to do vfio mappings concurrently doesn‘t
sound too crazy to me. But I haven‘t checked if vfio common code
already handles such concurrency.

There is a lot more out there than vfio.. RDMA already does concurrent
pin_user_pages in real apps

I actually misread your comment. I think we both agree that temporary
isolation failures must not lead to a failure.

-- 
Thanks,

David / dhildenb