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migration: simplify blockers

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Modify migrate_add_blocker and migrate_del_blocker to take an Error **
reason.  This allows migration to own the Error object, so that if
an error occurs in migrate_add_blocker, migration code can free the Error
and clear the client handle, simplifying client code.  It also simplifies
the migrate_del_blocker call site.

In addition, this is a pre-requisite for a proposed future patch that would
add a mode argument to migration requests to support live update, and
maintain a list of blockers for each mode.  A blocker may apply to a single
mode or to multiple modes, and passing Error** will allow one Error object
to be registered for multiple modes.

No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Tested-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Michael Galaxy <mgalaxy@akamai.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <1697634216-84215-1-git-send-email-steven.sistare@oracle.com>
This commit is contained in:
Steve Sistare 2023-10-18 06:03:36 -07:00 • committed by Juan Quintela
parent 04131e0009
commit c8a7fc5179
33 changed files with 92 additions and 150 deletions
Download patch file Download diff file Expand all files Collapse all files

10
backends/tpm/tpm_emulator.c
View file

@ -534,11 +534,8 @@ static int tpm_emulator_block_migration(TPMEmulator *tpm_emu)
error_setg(&tpm_emu->migration_blocker,
"Migration disabled: TPM emulator does not support "
"migration");
if (migrate_add_blocker(tpm_emu->migration_blocker, &err) < 0) {
if (migrate_add_blocker(&tpm_emu->migration_blocker, &err) < 0) {
error_report_err(err);
error_free(tpm_emu->migration_blocker);
tpm_emu->migration_blocker = NULL;
return -1;
}
}
@ -1016,10 +1013,7 @@ static void tpm_emulator_inst_finalize(Object *obj)
qapi_free_TPMEmulatorOptions(tpm_emu->options);
if (tpm_emu->migration_blocker) {
migrate_del_blocker(tpm_emu->migration_blocker);
error_free(tpm_emu->migration_blocker);
}
migrate_del_blocker(&tpm_emu->migration_blocker);
tpm_sized_buffer_reset(&state_blobs->volatil);
tpm_sized_buffer_reset(&state_blobs->permanent);