On Thu, Mar 25, 2021 at 4:10 PM Joao Martins [off-list ref] wrote:
@altmap is stored in a dev_pagemap, but it will be repurposed for
hotplug memory for storing the memmap in the hotplugged memory[*] and
reusing the altmap infrastructure to that end. This is to say that
altmap can't be replaced with a @pgmap as it is going to cover more than
dev_pagemap backend altmaps.
I was going to say, just pass the pgmap and lookup the altmap from
pgmap, but Oscar added a use case for altmap independent of pgmap. So
you might refresh this commit message to clarify why passing pgmap by
itself is not sufficient.
Other than that, looks good.