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authorEric Blake <eblake@redhat.com>2016-09-08 22:14:15 -0500
committerJuan Quintela <quintela@trasno.org>2016-10-13 17:23:53 +0200
commitde63ab61241b44598cdfd30060ef23d46d368f9d (patch)
treebad73f323cbab948879b2c5534384790b5032d2e
parentbb2b777cf9a2862fe31a40256659ff49ae3d2006 (diff)
downloadqemu-de63ab61241b44598cdfd30060ef23d46d368f9d.tar.gz
migrate: Share common MigrationParameters struct
It is rather verbose, and slightly error-prone, to repeat the same set of parameters for input (migrate-set-parameters) as for output (query-migrate-parameters), where the only difference is whether the members are optional. We can just document that the optional members will always be present on output, and then share a common struct between both commands. The next patch can then reduce the amount of code needed on input. Also, we made a mistake in qemu 2.7 of returning an empty string during 'query-migrate-parameters' when there is no TLS, rather than omitting TLS details entirely. Technically, this change risks breaking any 2.7 client that is hard-coded to expect the parameter's existence; on the other hand, clients that are portable to 2.6 already must be prepared for those members to not be present. And this gets rid of yet one more place where the QMP output visitor is silently converting a NULL string into "" (which is a hack I ultimately want to kill off). Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
-rw-r--r--hmp.c9
-rw-r--r--migration/migration.c7
-rw-r--r--qapi-schema.json85
3 files changed, 41 insertions, 60 deletions
diff --git a/hmp.c b/hmp.c
index 9509596e1b..c405d3ea0c 100644
--- a/hmp.c
+++ b/hmp.c
@@ -284,27 +284,32 @@ void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict)
if (params) {
monitor_printf(mon, "parameters:");
+ assert(params->has_compress_level);
monitor_printf(mon, " %s: %" PRId64,
MigrationParameter_lookup[MIGRATION_PARAMETER_COMPRESS_LEVEL],
params->compress_level);
+ assert(params->has_compress_threads);
monitor_printf(mon, " %s: %" PRId64,
MigrationParameter_lookup[MIGRATION_PARAMETER_COMPRESS_THREADS],
params->compress_threads);
+ assert(params->has_decompress_threads);
monitor_printf(mon, " %s: %" PRId64,
MigrationParameter_lookup[MIGRATION_PARAMETER_DECOMPRESS_THREADS],
params->decompress_threads);
+ assert(params->has_cpu_throttle_initial);
monitor_printf(mon, " %s: %" PRId64,
MigrationParameter_lookup[MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL],
params->cpu_throttle_initial);
+ assert(params->has_cpu_throttle_increment);
monitor_printf(mon, " %s: %" PRId64,
MigrationParameter_lookup[MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT],
params->cpu_throttle_increment);
monitor_printf(mon, " %s: '%s'",
MigrationParameter_lookup[MIGRATION_PARAMETER_TLS_CREDS],
- params->tls_creds ? : "");
+ params->has_tls_creds ? params->tls_creds : "");
monitor_printf(mon, " %s: '%s'",
MigrationParameter_lookup[MIGRATION_PARAMETER_TLS_HOSTNAME],
- params->tls_hostname ? : "");
+ params->has_tls_hostname ? params->tls_hostname : "");
monitor_printf(mon, "\n");
}
diff --git a/migration/migration.c b/migration/migration.c
index 955d5ee38c..1a8f26b3e9 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -559,12 +559,19 @@ MigrationParameters *qmp_query_migrate_parameters(Error **errp)
MigrationState *s = migrate_get_current();
params = g_malloc0(sizeof(*params));
+ params->has_compress_level = true;
params->compress_level = s->parameters.compress_level;
+ params->has_compress_threads = true;
params->compress_threads = s->parameters.compress_threads;
+ params->has_decompress_threads = true;
params->decompress_threads = s->parameters.decompress_threads;
+ params->has_cpu_throttle_initial = true;
params->cpu_throttle_initial = s->parameters.cpu_throttle_initial;
+ params->has_cpu_throttle_increment = true;
params->cpu_throttle_increment = s->parameters.cpu_throttle_increment;
+ params->has_tls_creds = !!s->parameters.tls_creds;
params->tls_creds = g_strdup(s->parameters.tls_creds);
+ params->has_tls_hostname = !!s->parameters.tls_hostname;
params->tls_hostname = g_strdup(s->parameters.tls_hostname);
return params;
diff --git a/qapi-schema.json b/qapi-schema.json
index 9e47b47cc7..e16e889505 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -668,75 +668,45 @@
#
# @migrate-set-parameters
#
-# Set the following migration parameters
-#
-# @compress-level: compression level
-#
-# @compress-threads: compression thread count
-#
-# @decompress-threads: decompression thread count
-#
-# @cpu-throttle-initial: Initial percentage of time guest cpus are throttled
-# when migration auto-converge is activated. The
-# default value is 20. (Since 2.7)
-#
-# @cpu-throttle-increment: throttle percentage increase each time
-# auto-converge detects that migration is not making
-# progress. The default value is 10. (Since 2.7)
-#
-# @tls-creds: ID of the 'tls-creds' object that provides credentials for
-# establishing a TLS connection over the migration data channel.
-# On the outgoing side of the migration, the credentials must
-# be for a 'client' endpoint, while for the incoming side the
-# credentials must be for a 'server' endpoint. Setting this
-# will enable TLS for all migrations. The default is unset,
-# resulting in unsecured migration at the QEMU level. (Since 2.7)
-#
-# @tls-hostname: hostname of the target host for the migration. This is
-# required when using x509 based TLS credentials and the
-# migration URI does not already include a hostname. For
-# example if using fd: or exec: based migration, the
-# hostname must be provided so that the server's x509
-# certificate identity can be validated. (Since 2.7)
+# Set various migration parameters. See MigrationParameters for details.
#
# Since: 2.4
##
{ 'command': 'migrate-set-parameters',
- 'data': { '*compress-level': 'int',
- '*compress-threads': 'int',
- '*decompress-threads': 'int',
- '*cpu-throttle-initial': 'int',
- '*cpu-throttle-increment': 'int',
- '*tls-creds': 'str',
- '*tls-hostname': 'str'} }
+ 'data': 'MigrationParameters' }
#
# @MigrationParameters
#
-# @compress-level: compression level
+# Optional members can be omitted on input ('migrate-set-parameters')
+# but most members will always be present on output
+# ('query-migrate-parameters'), with the exception of tls-creds and
+# tls-hostname.
#
-# @compress-threads: compression thread count
+# @compress-level: #optional compression level
#
-# @decompress-threads: decompression thread count
+# @compress-threads: #optional compression thread count
#
-# @cpu-throttle-initial: Initial percentage of time guest cpus are throttled
-# when migration auto-converge is activated. The
-# default value is 20. (Since 2.7)
+# @decompress-threads: #optional decompression thread count
#
-# @cpu-throttle-increment: throttle percentage increase each time
+# @cpu-throttle-initial: #optional Initial percentage of time guest cpus are
+# throttledwhen migration auto-converge is activated.
+# The default value is 20. (Since 2.7)
+#
+# @cpu-throttle-increment: #optional throttle percentage increase each time
# auto-converge detects that migration is not making
# progress. The default value is 10. (Since 2.7)
#
-# @tls-creds: ID of the 'tls-creds' object that provides credentials for
-# establishing a TLS connection over the migration data channel.
-# On the outgoing side of the migration, the credentials must
-# be for a 'client' endpoint, while for the incoming side the
+# @tls-creds: #optional ID of the 'tls-creds' object that provides credentials
+# for establishing a TLS connection over the migration data
+# channel. On the outgoing side of the migration, the credentials
+# must be for a 'client' endpoint, while for the incoming side the
# credentials must be for a 'server' endpoint. Setting this
# will enable TLS for all migrations. The default is unset,
# resulting in unsecured migration at the QEMU level. (Since 2.7)
#
-# @tls-hostname: hostname of the target host for the migration. This is
-# required when using x509 based TLS credentials and the
+# @tls-hostname: #optional hostname of the target host for the migration. This
+# is required when using x509 based TLS credentials and the
# migration URI does not already include a hostname. For
# example if using fd: or exec: based migration, the
# hostname must be provided so that the server's x509
@@ -745,14 +715,13 @@
# Since: 2.4
##
{ 'struct': 'MigrationParameters',
- 'data': { 'compress-level': 'int',
- 'compress-threads': 'int',
- 'decompress-threads': 'int',
- 'cpu-throttle-initial': 'int',
- 'cpu-throttle-increment': 'int',
- 'tls-creds': 'str',
- 'tls-hostname': 'str'} }
-
+ 'data': { '*compress-level': 'int',
+ '*compress-threads': 'int',
+ '*decompress-threads': 'int',
+ '*cpu-throttle-initial': 'int',
+ '*cpu-throttle-increment': 'int',
+ '*tls-creds': 'str',
+ '*tls-hostname': 'str'} }
##
# @query-migrate-parameters
#