Convert the code in migrate_params_test_apply() from an open-coded
copy of every migration parameter to a copy using visitors. The
current code has conditionals for each parameter's has_* field, which
is exactly what the visitors do.
This hides the details of QAPI from the migration code and avoids the
need to update migrate_params_test_apply() every time a new migration
parameter is added. Both were very confusing and while the visitor
code can become a bit involved, there is no need for new contributors
to ever touch it.
Move the QAPI_CLONE_MEMBERS into the caller, so QAPI_CLONE can be used
and there's no need to allocate memory in the migration
code. Similarly, turn 'tmp' into a pointer so the proper qapi_free_
routine can be used.
An extra call to migrate_mark_all_params_present() is now needed
because the visitors update the has_ field for non-present fields, but
we actually want them all set so QAPI_CLONE_MEMBERS copies all of
them.
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
migration/options.c | 145 +++-----------------------------------------
1 file changed, 10 insertions(+), 135 deletions(-)
diff --git a/migration/options.c b/migration/options.c
index 3c80cdfd3a..180ebed51c 100644
--- a/migration/options.c
+++ b/migration/options.c
@@ -19,6 +19,7 @@
#include "qapi/qapi-commands-migration.h"
#include "qapi/qapi-visit-migration.h"
#include "qapi/qmp/qerror.h"
+#include "qapi/type-helpers.h"
#include "qobject/qnull.h"
#include "system/runstate.h"
#include "migration/colo.h"
@@ -1265,133 +1266,6 @@ bool migrate_params_check(MigrationParameters *params, Error **errp)
return true;
}
-static void migrate_params_test_apply(MigrationParameters *params,
- MigrationParameters *dest)
-{
- MigrationState *s = migrate_get_current();
-
- QAPI_CLONE_MEMBERS(MigrationParameters, dest, &s->parameters);
-
- if (params->has_throttle_trigger_threshold) {
- dest->throttle_trigger_threshold = params->throttle_trigger_threshold;
- }
-
- if (params->has_cpu_throttle_initial) {
- dest->cpu_throttle_initial = params->cpu_throttle_initial;
- }
-
- if (params->has_cpu_throttle_increment) {
- dest->cpu_throttle_increment = params->cpu_throttle_increment;
- }
-
- if (params->has_cpu_throttle_tailslow) {
- dest->cpu_throttle_tailslow = params->cpu_throttle_tailslow;
- }
-
- if (params->tls_creds) {
- qapi_free_StrOrNull(dest->tls_creds);
- dest->tls_creds = QAPI_CLONE(StrOrNull, params->tls_creds);
- }
-
- if (params->tls_hostname) {
- qapi_free_StrOrNull(dest->tls_hostname);
- dest->tls_hostname = QAPI_CLONE(StrOrNull, params->tls_hostname);
- }
-
- if (params->tls_authz) {
- qapi_free_StrOrNull(dest->tls_authz);
- dest->tls_authz = QAPI_CLONE(StrOrNull, params->tls_authz);
- }
-
- if (params->has_max_bandwidth) {
- dest->max_bandwidth = params->max_bandwidth;
- }
-
- if (params->has_avail_switchover_bandwidth) {
- dest->avail_switchover_bandwidth = params->avail_switchover_bandwidth;
- }
-
- if (params->has_downtime_limit) {
- dest->downtime_limit = params->downtime_limit;
- }
-
- if (params->has_x_checkpoint_delay) {
- dest->x_checkpoint_delay = params->x_checkpoint_delay;
- }
-
- if (params->has_multifd_channels) {
- dest->multifd_channels = params->multifd_channels;
- }
- if (params->has_multifd_compression) {
- dest->multifd_compression = params->multifd_compression;
- }
- if (params->has_multifd_qatzip_level) {
- dest->multifd_qatzip_level = params->multifd_qatzip_level;
- }
- if (params->has_multifd_zlib_level) {
- dest->multifd_zlib_level = params->multifd_zlib_level;
- }
- if (params->has_multifd_zstd_level) {
- dest->multifd_zstd_level = params->multifd_zstd_level;
- }
- if (params->has_xbzrle_cache_size) {
- dest->xbzrle_cache_size = params->xbzrle_cache_size;
- }
- if (params->has_max_postcopy_bandwidth) {
- dest->max_postcopy_bandwidth = params->max_postcopy_bandwidth;
- }
- if (params->has_max_cpu_throttle) {
- dest->max_cpu_throttle = params->max_cpu_throttle;
- }
- if (params->has_announce_initial) {
- dest->announce_initial = params->announce_initial;
- }
- if (params->has_announce_max) {
- dest->announce_max = params->announce_max;
- }
- if (params->has_announce_rounds) {
- dest->announce_rounds = params->announce_rounds;
- }
- if (params->has_announce_step) {
- dest->announce_step = params->announce_step;
- }
-
- if (params->has_block_bitmap_mapping) {
- qapi_free_BitmapMigrationNodeAliasList(dest->block_bitmap_mapping);
- dest->block_bitmap_mapping = QAPI_CLONE(BitmapMigrationNodeAliasList,
- params->block_bitmap_mapping);
- }
-
- if (params->has_x_vcpu_dirty_limit_period) {
- dest->x_vcpu_dirty_limit_period =
- params->x_vcpu_dirty_limit_period;
- }
- if (params->has_vcpu_dirty_limit) {
- dest->vcpu_dirty_limit = params->vcpu_dirty_limit;
- }
-
- if (params->has_mode) {
- dest->mode = params->mode;
- }
-
- if (params->has_zero_page_detection) {
- dest->zero_page_detection = params->zero_page_detection;
- }
-
- if (params->has_direct_io) {
- dest->direct_io = params->direct_io;
- }
-
- if (params->has_cpr_exec_command) {
- qapi_free_strList(dest->cpr_exec_command);
- dest->cpr_exec_command = QAPI_CLONE(strList, params->cpr_exec_command);
- }
-}
-
-/*
- * Caller must ensure the has_* fields of @params are true so they all
- * get copied and the pointer members don't dangle.
- */
static void migrate_params_apply(MigrationParameters *params)
{
MigrationState *s = migrate_get_current();
@@ -1400,12 +1274,17 @@ static void migrate_params_apply(MigrationParameters *params)
migrate_tls_opts_free(cur);
qapi_free_BitmapMigrationNodeAliasList(cur->block_bitmap_mapping);
qapi_free_strList(cur->cpr_exec_command);
+
+ /* mark all present, so they're all copied */
+ migrate_mark_all_params_present(params);
QAPI_CLONE_MEMBERS(MigrationParameters, cur, params);
}
void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp)
{
- MigrationParameters tmp;
+ MigrationState *s = migrate_get_current();
+ g_autoptr(MigrationParameters) tmp = QAPI_CLONE(MigrationParameters,
+ &s->parameters);
/*
* Convert QTYPE_QNULL and NULL to the empty string (""). Even
@@ -1419,14 +1298,10 @@ void qmp_migrate_set_parameters(MigrationParameters *params, Error **errp)
tls_opt_to_str(params->tls_hostname);
tls_opt_to_str(params->tls_authz);
- migrate_params_test_apply(params, &tmp);
+ QAPI_MERGE(MigrationParameters, tmp, params);
- if (migrate_params_check(&tmp, errp)) {
- migrate_params_apply(&tmp);
+ if (migrate_params_check(tmp, errp)) {
+ migrate_params_apply(tmp);
migrate_post_update_params(params, errp);
}
-
- migrate_tls_opts_free(&tmp);
- qapi_free_BitmapMigrationNodeAliasList(tmp.block_bitmap_mapping);
- qapi_free_strList(tmp.cpr_exec_command);
}
--
2.51.0