On Wed, Mar 11, 2026 at 01:16:58PM +0800, Yanfei Xu wrote:
/old-style vmstate doesn't use vmsd and instead rely on SaveStateEntry/
/ops. Check is_active for old-style vmstate to determine whether they/
/should be skipped during migration./
Would you please dscribe the use case?
We only have two users in upstream tree that provided is_active(), and
neither of them provided save_state(). IOW, so far it works kind of mutual
exclusively v.s. save_state(), afaict.
Sorry for the lack of background information.
We follow the vfio SaveVMHandlers and add an extra vfio SaveVMHandlers
variant with is_active. In our internal codebase, we set it inactive
during migration but active in a specific scenario.
You are right that upstream tree works well. I sent this patch because I
assumed the semantics of is_active is similiar to the "needed" field in
vmsd.
I'd like to get your opinion on this. Perhaps this case we used won't
occur in upstream?
Thanks,
Yanfei
