Function register_regions

pub unsafe fn register_regions(
    regions: &[Range<usize>],
    uffds: &[Userfaultfd],
) -> Result<()>

Register all the regions to all the userfaultfd

Arguments

• regions - the list of address range of regions.
• uffds - the reference to the list of Userfaultfd for all the processes which may touch the address_range to be registered.

Safety

Each address range in regions must be from guest memory.

The uffds must cover all the processes which may touch the address_range. otherwise some pages are zeroed by kernel on the unregistered process instead of swapping in from the swap file.