On 28/05/20 13:39, Vitaly Kuznetsov wrote: >> How is the pageready_pending flag migrated? Should we revert the >> direction of the MSR (i.e. read the flag, and write 0 to clear it)? > The flag is not migrated so it will be 'false'. This can just cause an > extra kick in kvm_arch_async_page_present_queued() but this shouldn't be > a big deal. Also, after migration we will just send 'wakeup all' event, > async pf queue will be empty. Ah, that's kvm_pv_enable_async_pf, where the destination writes to MSR_KVM_ASYNC_PF. Cool. > MSR_KVM_ASYNC_PF_ACK by itself is not > migrated, we don't even store it, not sure how invering it would change > things. Yes, it would only be useful to invert it if it needs to be stored and migrated. Thanks, Paolo
