/* * GNTTABOP_unmap_and_replace: Destroy one or more grant-reference mappings * tracked by <handle> but atomically replace the page table entry with one * pointing to the machine address under <new_addr>. <new_addr> will be * redirected to the null entry. * NOTES: * 1. The call may fail in an undefined manner if either mapping is not * tracked by <handle>. * 2. After executing a batch of unmaps, it is guaranteed that no stale * mappings will remain in the device or host TLBs. */