Excerpts from Nathan Lynch's message of March 15, 2021 6:00 pm: > pseries VMs in shared processor mode are susceptible to failed > migrations becasue stray H_PRODs from the paravirt spinlock > implementation can bump threads out of joining state before the > suspend has occurred. Fix this by adding a small amount of shared > state and ordering accesses to it with respect to H_PROD and H_JOIN.
Oh, tricky problem. Nice work on finding and fixing it. The patches seem okay to me. Thanks, Nick
