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Fri, 4 Sep 2026 13:41:23 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id lzyKI4PKmmo1GAAAD6G6ig (envelope-from ); Fri, 04 Sep 2026 13:41:23 +0000 From: Fabiano Rosas To: Peter Xu Cc: qemu-devel@nongnu.org Subject: Re: [PATCH 13/18] migration: Use output visitor in info command In-Reply-To: References: <20260902221547.1812481-1-farosas@suse.de> <20260902221547.1812481-14-farosas@suse.de> Date: Fri, 04 Sep 2026 10:41:21 -0300 Message-ID: <87zexx6sn2.fsf@suse.de> MIME-Version: 1.0 Content-Type: text/plain X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; RCPT_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; MISSING_XM_UA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_VIA_SMTP_AUTH(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid, suse.de:email, imap1.dmz-prg2.suse.org:helo] Received-SPF: pass client-ip=195.135.223.131; envelope-from=farosas@suse.de; helo=smtp-out2.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Peter Xu writes: > On Wed, Sep 02, 2026 at 07:15:41PM -0300, Fabiano Rosas wrote: >> The hmp_info_migrate_parameters function currently open-codes the >> mon_printf calls for each migration parameter. As with the set command >> in the last patch, this should not be necessary as the QAPI >> infrastructure already has generated code that takes type and struct >> member names into account, including converting _ from C into the '-' >> character as part of parameter names strings. >> >> The current code is also quite painful to rebase if a series has been >> carried for a long time while parameters have been added in master. >> >> Replace all of this with a conversion from MigrationParameters to >> QDict using an output visitor and a loop over the QDict that prints >> per-QAPI-type formatted strings. >> >> Modelled after block/qapi.c:dump_qobject, but with some changes to >> keep the migration command output formatting. >> >> Note that this was not a for-free improvement, the HMP command format >> output was changed incompatibly in a previous patch. It doesn't output >> units anymore. > > IIUC both qlist and qdict are only used in BitmapMigrationNodeAlias only. > It would be nice to attach an example of HMP dump before/after the change > of these two patches, either in previous patch or here (assuming the layout > changed once). In case HMP has some suggestion in general, I suggest copy > Dave when repost in case he has something to say. > Will do. >> >> Signed-off-by: Fabiano Rosas >> --- >> migration/migration-hmp-cmds.c | 243 ++++++++++++++------------------- >> 1 file changed, 100 insertions(+), 143 deletions(-) >> >> diff --git a/migration/migration-hmp-cmds.c b/migration/migration-hmp-cmds.c >> index 089c6d4ff46..dff69650a0c 100644 >> --- a/migration/migration-hmp-cmds.c >> +++ b/migration/migration-hmp-cmds.c >> @@ -25,7 +25,12 @@ >> #include "qapi/qapi-commands-migration.h" >> #include "qapi/qapi-visit-migration.h" >> #include "qapi/qobject-input-visitor.h" >> +#include "qapi/qobject-output-visitor.h" >> +#include "qobject/qbool.h" >> #include "qobject/qdict.h" >> +#include "qobject/qjson.h" >> +#include "qobject/qlist.h" >> +#include "qobject/qnum.h" >> #include "qobject/qstring.h" >> #include "qapi/string-input-visitor.h" >> #include "qapi/string-output-visitor.h" >> @@ -316,170 +321,122 @@ void hmp_info_migrate_capabilities(Monitor *mon, const QDict *qdict) >> qapi_free_MigrationCapabilityStatusList(caps); >> } >> >> -static void monitor_print_cpr_exec_command(Monitor *mon, strList *args) >> +static QDict *migrate_params_to_dict(MigrationParameters *p, Error **errp) >> { >> - monitor_printf(mon, "%s:", >> - MigrationParameter_str(MIGRATION_PARAMETER_CPR_EXEC_COMMAND)); >> + QObject *obj = NULL; >> + Visitor *v = qobject_output_visitor_new(&obj); >> >> - while (args) { >> - monitor_printf(mon, " %s", args->value); >> - args = args->next; >> + if (visit_type_MigrationParameters(v, NULL, &p, errp)) { >> + visit_complete(v, &obj); >> } >> - monitor_printf(mon, "\n"); >> + visit_free(v); >> + return qobject_to(QDict, obj); >> } > > This exact function also exists in options.c (with the same name and > impl). Can reuse. > Of course! I just forgot to do it. Thanks. >> >> -void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict) >> +static void hmp_migrate_print_qobject(Monitor *mon, const char *label, >> + QObject *obj) >> { >> - MigrationParameters *params; >> - MigrationState *s = migrate_get_current(); >> + const char *sep; >> >> - params = qmp_query_migrate_parameters(NULL); >> + if (!obj) { >> + return; >> + } >> >> - if (params) { >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_INITIAL), >> - params->announce_initial); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_MAX), >> - params->announce_max); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_ROUNDS), >> - params->announce_rounds); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_ANNOUNCE_STEP), >> - params->announce_step); >> - assert(params->has_throttle_trigger_threshold); >> - monitor_printf(mon, "%s: %u\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_THROTTLE_TRIGGER_THRESHOLD), >> - params->throttle_trigger_threshold); >> - assert(params->has_cpu_throttle_initial); >> - monitor_printf(mon, "%s: %u\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_INITIAL), >> - params->cpu_throttle_initial); >> - assert(params->has_cpu_throttle_increment); >> - monitor_printf(mon, "%s: %u\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_INCREMENT), >> - params->cpu_throttle_increment); >> - assert(params->has_cpu_throttle_tailslow); >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_CPU_THROTTLE_TAILSLOW), >> - params->cpu_throttle_tailslow ? "on" : "off"); >> - assert(params->has_max_cpu_throttle); >> - monitor_printf(mon, "%s: %u\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_MAX_CPU_THROTTLE), >> - params->max_cpu_throttle); >> - assert(params->tls_creds); >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_TLS_CREDS), >> - params->tls_creds->u.s); >> - assert(params->tls_hostname); >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_TLS_HOSTNAME), >> - params->tls_hostname->u.s); >> - assert(params->tls_authz); >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_TLS_AUTHZ), >> - params->tls_authz->u.s); >> - assert(params->has_max_bandwidth); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_MAX_BANDWIDTH), >> - params->max_bandwidth); >> - assert(params->has_avail_switchover_bandwidth); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_AVAIL_SWITCHOVER_BANDWIDTH), >> - params->avail_switchover_bandwidth); >> - assert(params->has_max_postcopy_bandwidth); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_MAX_POSTCOPY_BANDWIDTH), >> - params->max_postcopy_bandwidth); >> - assert(params->has_downtime_limit); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_DOWNTIME_LIMIT), >> - params->downtime_limit); >> - assert(params->has_x_checkpoint_delay); >> - monitor_printf(mon, "%s: %u\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_X_CHECKPOINT_DELAY), >> - params->x_checkpoint_delay); >> - monitor_printf(mon, "%s: %u\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_CHANNELS), >> - params->multifd_channels); >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_MULTIFD_COMPRESSION), >> - MultiFDCompression_str(params->multifd_compression)); >> - assert(params->has_zero_page_detection); >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_ZERO_PAGE_DETECTION), >> - qapi_enum_lookup(&ZeroPageDetection_lookup, >> - params->zero_page_detection)); >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_XBZRLE_CACHE_SIZE), >> - params->xbzrle_cache_size); >> + /* >> + * Put a space after labels >> + * foo: bar >> + * ^ >> + */ >> + if (label && label[0] && label[strlen(label) - 1] == ':') { >> + sep = " "; >> + } else { >> + sep = ""; >> + } >> >> - if (s->has_block_bitmap_mapping) { >> - BitmapMigrationNodeAliasList *nal; >> - BitmapMigrationNodeAlias *na; >> - BitmapMigrationBitmapAliasList *bal; >> - BitmapMigrationBitmapAlias *ba; >> - BitmapMigrationBitmapAliasTransform *bat; >> + switch (qobject_type(obj)) { >> + case QTYPE_NONE: >> + g_assert_not_reached(); >> + case QTYPE_QNULL: >> + break; > > Shall we assert too if we don't expect it? > Could be, I'll check. >> + case QTYPE_QNUM: { >> + int64_t i64; >> >> - monitor_printf(mon, "%s:", >> - MigrationParameter_str( >> - MIGRATION_PARAMETER_BLOCK_BITMAP_MAPPING)); >> + if (qnum_get_try_int(qobject_to(QNum, obj), &i64)) { >> + monitor_printf(mon, "%s%s%" PRId64, label, sep, i64); > > Should we use qnum_to_string() like what dump_qobject() does? > I missed that helper, let me see. > Logically any size/u64 parameter (which may not be a normal use case..) can > be set larger than INT64_MAX, so qnum_get_try_int() may return false? Here > skipping to print anything is benign if it only happens with a malicious > monitor client, but I think we should try to capture all cases. > Yeah, makes sense. >> + } >> + break; >> + } >> + case QTYPE_QSTRING: { >> + QString *str = qobject_to(QString, obj); >> >> - for (nal = params->block_bitmap_mapping; nal; nal = nal->next) >> - { >> - na = nal->value; >> - monitor_printf(mon, " bitmaps:"); >> - for (bal = na->bitmaps; bal; bal = bal->next) { >> - ba = bal->value; >> - bat = ba->transform; >> + if (str) { > > Any chance str==NULL here? > Yes. But I get your point, see below. >> + monitor_printf(mon, "%s%s%s", label, sep, qstring_get_str(str)); >> + } >> + break; >> + } >> + case QTYPE_QDICT: { >> + QDict *d = qobject_to(QDict, obj); >> + const QDictEntry *e; >> + int i = 0; >> >> - monitor_printf(mon, " name: %s", ba->name); >> - if (bat && bat->has_persistent) { >> - if (bat->persistent) { >> - monitor_printf(mon, " persistent: on"); >> - } else { >> - monitor_printf(mon, " persistent: off"); >> - } >> - } >> - monitor_printf(mon, " alias: %s", ba->alias); >> + if (d) { >> + for (e = qdict_first(d); e; e = qdict_next(d, e), i++) { >> + g_autofree char *l = g_strdup_printf("%s:", qdict_entry_key(e)); >> + if (i) { >> + monitor_printf(mon, " "); >> } >> - monitor_printf(mon, " node-name: %s alias: %s", >> - na->node_name, na->alias); >> + hmp_migrate_print_qobject(mon, l, qdict_entry_value(e)); >> } >> - >> - monitor_printf(mon, "\n"); >> } >> + break; >> + } >> + case QTYPE_QLIST: { >> + QList *l = qobject_to(QList, obj); >> + const QListEntry *e; >> >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_X_VCPU_DIRTY_LIMIT_PERIOD), >> - params->x_vcpu_dirty_limit_period); >> + if (l) { >> + monitor_printf(mon, "%s", label); >> >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_VCPU_DIRTY_LIMIT), >> - params->vcpu_dirty_limit); >> + for (e = qlist_first(l); e; e = qlist_next(e)) { >> + /* >> + * In the first iteration, this is the space after the >> + * colon, otherwise it's the space between list >> + * elements. >> + */ >> + monitor_printf(mon, " "); >> + hmp_migrate_print_qobject(mon, "", e->value); >> + } >> + } >> + break; >> + } >> + case QTYPE_QBOOL: { >> + QBool *b = qobject_to(QBool, obj); >> + if (b) { > > Similarly, I'd drop "if" if it will always happen, making qbool_get_bool() > assert itself by deref. > I'd rather not have such asserts in user-facing code. Even with testing, it's hard to ensure this 'obj' will reach here in integrity. >> + monitor_printf(mon, "%s%s%s", label, sep, >> + qbool_get_bool(b) ? "on" : "off"); >> + } >> + break; >> + } >> + default: >> + g_assert_not_reached(); >> + break; >> + } >> +} >> >> - assert(params->has_mode); >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str(MIGRATION_PARAMETER_MODE), >> - qapi_enum_lookup(&MigMode_lookup, params->mode)); >> +void hmp_info_migrate_parameters(Monitor *mon, const QDict *qdict) >> +{ >> + MigrationParameters *params = qmp_query_migrate_parameters(NULL); >> + g_autoptr(QDict) d; >> + const QDictEntry *e; >> >> - if (params->has_direct_io) { >> - monitor_printf(mon, "%s: %s\n", >> - MigrationParameter_str( >> - MIGRATION_PARAMETER_DIRECT_IO), >> - params->direct_io ? "on" : "off"); >> - } >> + assert(params); >> >> - if (params->has_x_rdma_chunk_size) { >> - monitor_printf(mon, "%s: %" PRIu64 "\n", >> - MigrationParameter_str( >> - MIGRATION_PARAMETER_X_RDMA_CHUNK_SIZE), >> - params->x_rdma_chunk_size); >> - } >> + d = migrate_params_to_dict(params, NULL); >> + for (e = qdict_first(d); e; e = qdict_next(d, e)) { >> + g_autofree char *label = g_strdup_printf("%s:", qdict_entry_key(e)); >> >> - assert(params->has_cpr_exec_command); >> - monitor_print_cpr_exec_command(mon, params->cpr_exec_command); >> + hmp_migrate_print_qobject(mon, label, qdict_entry_value(e)); >> + monitor_printf(mon, "\n"); >> } >> >> qapi_free_MigrationParameters(params); >> -- >> 2.53.0 >>