Re: [PATCH v2 5/6] migration/postcopy: Handle RAMBlocks with a RamDiscardManager on the destination

[Peter Xu]

On Fri, Jul 23, 2021 at 09:01:42PM +0200, David Hildenbrand wrote:
> It can happen in corner cases and is valid: with the current virtio-mem
> spec, guests are allowed to read unplugged memory. This will, for example,
> happen on older Linux guests when reading /proc/kcore or (with even older
> guests) when dumping guest memory via kdump. These corner cases were the
> main reason why the spec allows for it -- until we have guests properly
> adjusted such that it won't happen even in corner cases.
> 
> A future feature bit will disallow it for the guest: required for supporting
> shmem/hugetlb cleanly. With that in place, I agree that we would want to
> warn in this case!

OK that makes sense; with the page_size change, feel free to add:

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu