Am 24.02.21 um 19:46 schrieb Jason Gunthorpe:
On Wed, Feb 24, 2021 at 09:45:51AM +0100, Daniel Vetter wrote:Hm I figured everyone just uses MAP_SHARED for buffer objects since COW really makes absolutely no sense. How would we enforce this?In RDMA we test drivers/infiniband/core/ib_core_uverbs.c: if (!(vma->vm_flags & VM_SHARED)) During mmap to reject use of MAP_PRIVATE on BAR pages.
That's a really good idea. MAP_PRIVATE and any driver mappings doesn't really work at all.
Christian.
Jason
