Re: [PATCH v2 03/23] migration/multifd: Drop MultiFDSendParams.quit, cleanup error paths

[Fabiano Rosas <farosas@suse.de>]

peterx@redhat.com writes:

> From: Peter Xu <peterx@redhat.com>
>
> Multifd send side has two fields to indicate error quits:
>
>   - MultiFDSendParams.quit
>   - &multifd_send_state->exiting
>
> Merge them into the global one.  The replacement is done by changing all
> p->quit checks into the global var check.  The global check doesn't need
> any lock.
>
> A few more things done on top of this altogether:
>
>   - multifd_send_terminate_threads()
>
>     Moving the xchg() of &multifd_send_state->exiting upper, so as to cover
>     the tracepoint, migrate_set_error() and migrate_set_state().
>
>   - multifd_send_sync_main()
>
>     In the 2nd loop, add one more check over the global var to make sure we
>     don't keep the looping if QEMU already decided to quit.
>
>   - multifd_tls_outgoing_handshake()
>
>     Use multifd_send_terminate_threads() to set the error state.  That has
>     a benefit of updating MigrationState.error to that error too, so we can
>     persist that 1st error we hit in that specific channel.
>
>   - multifd_new_send_channel_async()
>
>     Take similar approach like above, drop the migrate_set_error() because
>     multifd_send_terminate_threads() already covers that.  Unwrap the helper
>     multifd_new_send_channel_cleanup() along the way; not really needed.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Fabiano Rosas <farosas@suse.de>