Steve Sistare <steven.sist...@oracle.com> writes:
> Initialize the migration object as early as possible so that migration
> configuration commands may be sent during the precreate phase. Also,
> start listening for the incoming migration connection during precreate,
> so that the listen port number is assigned (if dynamic), and the user
> can discover it during precreate via query-migrate. The precreate phase
> will be delineated in a subsequent patch.
>
> The code previously called migration_object_init after memory backends
> were created so that a subsequent migrate-set-capabilities call to set
> MIGRATION_CAPABILITY_POSTCOPY_RAM would verify all backends support
> postcopy. See migrate_caps_check and postcopy_ram_supported_by_host.
> The new code calls migration_object_init before backends are created.
> However, migrate-set-capabilities will only be received during the
> precreate phase for CPR, and CPR does not support postcopy. If the
> precreate phase is generalized in the future, then the ram compatibility
> check must be deferred to the start of migration.
>
> Signed-off-by: Steve Sistare <steven.sist...@oracle.com>
> ---
> system/vl.c | 35 +++++++++++++----------------------
> 1 file changed, 13 insertions(+), 22 deletions(-)
>
> diff --git a/system/vl.c b/system/vl.c
> index bca2292..d32203c 100644
> --- a/system/vl.c
> +++ b/system/vl.c
> @@ -2753,17 +2753,7 @@ void qmp_x_exit_preconfig(Error **errp)
> replay_vmstate_init();
> }
>
> - if (incoming) {
> - Error *local_err = NULL;
> - if (strcmp(incoming, "defer") != 0) {
> - qmp_migrate_incoming(incoming, false, NULL, true, true,
> - &local_err);
> - if (local_err) {
> - error_reportf_err(local_err, "-incoming %s: ", incoming);
> - exit(1);
> - }
> - }
> - } else if (autostart) {
> + if (!incoming && autostart) {
> qmp_cont(NULL);
> }
> }
> @@ -3751,6 +3741,18 @@ void qemu_init(int argc, char **argv)
> * called from do_configure_accelerator().
> */
>
> + /* Creates a QOM object */
> + migration_object_init();
> +
> + if (incoming && !g_str_equal(incoming, "defer")) {
> + Error *local_err = NULL;
> + qmp_migrate_incoming(incoming, false, NULL, true, true, &local_err);
> + if (local_err) {
> + error_reportf_err(local_err, "-incoming %s: ", incoming);
> + exit(1);
> + }
> + }
Doesn't this break preconfig? Now migrate_incoming happens without user
input so there's no time to set migration options before incoming code
starts using them.
> +
> suspend_mux_open();
>
> qemu_disable_default_devices();
> @@ -3773,20 +3775,9 @@ void qemu_init(int argc, char **argv)
> machine_class->name, machine_class->deprecation_reason);
> }
>
> - /*
> - * Create backends before creating migration objects, so that it can
> - * check against compatibilities on the backend memories (e.g. postcopy
> - * over memory-backend-file objects).
> - */
> qemu_create_late_backends();
> phase_advance(PHASE_LATE_BACKENDS_CREATED);
>
> - /*
> - * Note: creates a QOM object, must run only after global and
> - * compat properties have been set up.
> - */
> - migration_object_init();
> -
> /* parse features once if machine provides default cpu_type */
> current_machine->cpu_type =
> machine_class_default_cpu_type(machine_class);
> if (cpu_option) {
