diff options
| -rw-r--r-- | migration/migration.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/migration/migration.c b/migration/migration.c index 7bc406a870..253395c3c2 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -720,6 +720,7 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, { MigrationState *s = migrate_get_current(); MigrationCapabilityStatusList *cap; + bool old_postcopy_cap = migrate_postcopy_ram(); if (migration_is_setup_or_active(s->state)) { error_setg(errp, QERR_MIGRATION_ACTIVE); @@ -742,6 +743,19 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = false; } + /* This check is reasonably expensive, so only when it's being + * set the first time, also it's only the destination that needs + * special support. + */ + if (!old_postcopy_cap && runstate_check(RUN_STATE_INMIGRATE) && + !postcopy_ram_supported_by_host()) { + /* postcopy_ram_supported_by_host will have emitted a more + * detailed message + */ + error_report("Postcopy is not supported"); + s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] = + false; + } } } |