On 21.10.25 22:50, Michael S. Tsirkin wrote:

On Tue, Oct 21, 2025 at 02:59:09PM +0200, David Hildenbrand wrote:

quoted

Let's update the balloon page references, the balloon page list, the
BALLOON_MIGRATE counter and the isolated-pages counter in
balloon_page_migrate(), after letting the balloon->migratepage()
callback deal with the actual inflation+deflation.

Note that we now perform the balloon list modifications outside of any
implementation-specific locks: which is fine, there is nothing special
about these page actions that the lock would be protecting.

The old page is already no longer in the list (isolated) and the new page
is not yet in the list.

Let's use -ENOENT to communicate the special "inflation of new page
failed after already deflating the old page" to balloon_page_migrate() so
it can handle it accordingly.

While at it, rename balloon->b_dev_info to make it mach the other

match

Thanks!

-- 
Cheers

David / dhildenb