Re: [PATCH v1 4/5] migration/ram: Rely on used_length for uffd_change_protection()

[Juan Quintela]

David Hildenbrand <david@redhat.com> wrote:
> ram_mig_ram_block_resized() will abort migration (including background
> snapshots) when resizing a RAMBlock. ram_block_populate_read() will only
> populate RAM up to used_length, so at least for anonymous memory
> protecting everything between used_length and max_length won't
> actually be protected and is just a NOP.
>
> So let's only protect everything up to used_length.
>
> Note: it still makes sense to register uffd-wp for max_length, such
> that RAM_UF_WRITEPROTECT is independent of a changing used_length.
>
> Signed-off-by: David Hildenbrand <david@redhat.com>

Reviewed-by: Juan Quintela <quintela@redhat.com>