On Sat, 25 Nov 2023 15:51:04 -0800, Haren Myneni wrote:

The hypervisor returns migration failure if all VAS windows are not
closed. During pre-migration stage, vas_migration_handler() sets
migration_in_progress flag and closes all windows from the list.
The allocate VAS window routine checks the migration flag, setup
the window and then add it to the list. So there is possibility of
the migration handler missing the window that is still in the
process of setup.

[...]

Applied to powerpc/fixes.

[1/1] powerpc/pseries/vas: Migration suspend waits for no in-progress open windows
      https://git.kernel.org/powerpc/c/0cf72f7f14d12cb065c3d01954cf42fc5638aa69

cheers