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Thu, 21 Aug 2025 01:45:51 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEaLZWBQB1w092XmkT9ahW3rNYHnJjovPCV+qye6bZNZXd0Dsshe+JAzoxEp9TVrTX50HJxYA== X-Received: by 2002:a17:903:2f0c:b0:240:a53:dd37 with SMTP id d9443c01a7336-245febff389mr23658465ad.21.1755765950353; Thu, 21 Aug 2025 01:45:50 -0700 (PDT) From: Arun Menon Date: Thu, 21 Aug 2025 14:14:01 +0530 Subject: [PATCH v12 07/27] migration: push Error **errp into qemu_loadvm_state() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250821-propagate_tpm_error-v12-7-72b803e707dc@redhat.com> References: <20250821-propagate_tpm_error-v12-0-72b803e707dc@redhat.com> In-Reply-To: <20250821-propagate_tpm_error-v12-0-72b803e707dc@redhat.com> To: qemu-devel@nongnu.org Cc: Peter Xu , Fabiano Rosas , =?utf-8?q?Alex_Benn=C3=A9e?= , Akihiko Odaki , Dmitry Osipenko , "Michael S. Tsirkin" , Marcel Apfelbaum , Cornelia Huck , Halil Pasic , Eric Farman , Thomas Huth , Christian Borntraeger , Matthew Rosato , Richard Henderson , David Hildenbrand , Ilya Leoshkevich , Nicholas Piggin , Harsh Prateek Bora , Paolo Bonzini , Fam Zheng , Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_Goater?= , Steve Sistare , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , qemu-s390x@nongnu.org, qemu-ppc@nongnu.org, Hailiang Zhang , Stefan Berger , Peter Maydell , qemu-arm@nongnu.org, Arun Menon X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=6166; i=armenon@redhat.com; h=from:subject:message-id; bh=2GPGf4Sq7y6kiBRdOroq30uHxsa4iqqhvb39fHUhlZ4=; b=owGbwMvMwCWWVaVqcZPfqI/xtFoSQ8ayO8mtBXnvnthdnuWoOp91wk+JeczfTzw4k3Jp8fat0 T59EkviOkpZGMS4GGTFFFkavgbINgUURkTavrwOM4eVCWQIAxenAExk9WNGhonfJocoOrJ8LV0c W/Gm8eTuJ4G3P2+cp89UEvvfw4ZT9AIjQ1fxiyKdxNVdO26oiL+dO39eyotFLde2b5inOG8Z33q XWE4A X-Developer-Key: i=armenon@redhat.com; a=openpgp; fpr=80F5501D82507158593DE9D76A7A2538D90F328E Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=armenon@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1755766078441124100 This is an incremental step in converting vmstate loading code to report error via Error objects instead of directly printing it to console/monitor. It is ensured that qemu_loadvm_state() must report an error in errp, in case of failure. When postcopy live migration runs, the device states are loaded by both the qemu coroutine process_incoming_migration_co() and the postcopy_ram_listen_thread(). Therefore, it is important that the coroutine also reports the error in case of failure, with error_report_err(). Otherwise, the source qemu will not display any errors before going into the postcopy pause state. Reviewed-by: Marc-Andr=C3=A9 Lureau Signed-off-by: Arun Menon Reviewed-by: Fabiano Rosas --- migration/migration.c | 9 +++++---- migration/savevm.c | 30 ++++++++++++++++++------------ migration/savevm.h | 2 +- 3 files changed, 24 insertions(+), 17 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 10c216d25dec01f206eacad2edd24d21f00e614c..c6768d88f45c870c7fad9b99573= 00766ff69effc 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -881,7 +881,7 @@ process_incoming_migration_co(void *opaque) MIGRATION_STATUS_ACTIVE); =20 mis->loadvm_co =3D qemu_coroutine_self(); - ret =3D qemu_loadvm_state(mis->from_src_file); + ret =3D qemu_loadvm_state(mis->from_src_file, &local_err); mis->loadvm_co =3D NULL; =20 trace_vmstate_downtime_checkpoint("dst-precopy-loadvm-completed"); @@ -908,7 +908,8 @@ process_incoming_migration_co(void *opaque) } =20 if (ret < 0) { - error_setg(&local_err, "load of migration failed: %s", strerror(-r= et)); + error_prepend(&local_err, "load of migration failed: %s: ", + strerror(-ret)); goto fail; } =20 @@ -924,13 +925,13 @@ fail: migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, MIGRATION_STATUS_FAILED); migrate_set_error(s, local_err); - error_free(local_err); + error_report_err(local_err); =20 migration_incoming_state_destroy(); =20 if (mis->exit_on_error) { WITH_QEMU_LOCK_GUARD(&s->error_mutex) { - error_report_err(s->error); + error_free(s->error); s->error =3D NULL; } =20 diff --git a/migration/savevm.c b/migration/savevm.c index 5793bbfdda593c984bd2230f4052c3e68808acf1..b4d21a4814d3b706e6b89b39528= ca269559e2e0d 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -3161,28 +3161,24 @@ out: return ret; } =20 -int qemu_loadvm_state(QEMUFile *f) +int qemu_loadvm_state(QEMUFile *f, Error **errp) { MigrationState *s =3D migrate_get_current(); MigrationIncomingState *mis =3D migration_incoming_get_current(); - Error *local_err =3D NULL; int ret; =20 - if (qemu_savevm_state_blocked(&local_err)) { - error_report_err(local_err); + if (qemu_savevm_state_blocked(errp)) { return -EINVAL; } =20 qemu_loadvm_thread_pool_create(mis); =20 - ret =3D qemu_loadvm_state_header(f, &local_err); + ret =3D qemu_loadvm_state_header(f, errp); if (ret) { - error_report_err(local_err); return ret; } =20 - if (qemu_loadvm_state_setup(f, &local_err) !=3D 0) { - error_report_err(local_err); + if (qemu_loadvm_state_setup(f, errp) !=3D 0) { return -EINVAL; } =20 @@ -3193,6 +3189,9 @@ int qemu_loadvm_state(QEMUFile *f) cpu_synchronize_all_pre_loadvm(); =20 ret =3D qemu_loadvm_state_main(f, mis); + if (ret < 0) { + error_setg(errp, "Load VM state failed: %d", ret); + } qemu_event_set(&mis->main_thread_load_event); =20 trace_qemu_loadvm_state_post_main(ret); @@ -3210,8 +3209,15 @@ int qemu_loadvm_state(QEMUFile *f) if (migrate_has_error(migrate_get_current()) || !qemu_loadvm_thread_pool_wait(s, mis)) { ret =3D -EINVAL; + error_setg(errp, + "Error while loading vmstate"); } else { ret =3D qemu_file_get_error(f); + if (ret < 0) { + error_setg(errp, + "Error while loading vmstate: stream error: %d", + ret); + } } } /* @@ -3476,6 +3482,7 @@ void qmp_xen_save_devices_state(const char *filename,= bool has_live, bool live, =20 void qmp_xen_load_devices_state(const char *filename, Error **errp) { + ERRP_GUARD(); QEMUFile *f; QIOChannelFile *ioc; int ret; @@ -3497,10 +3504,10 @@ void qmp_xen_load_devices_state(const char *filenam= e, Error **errp) f =3D qemu_file_new_input(QIO_CHANNEL(ioc)); object_unref(OBJECT(ioc)); =20 - ret =3D qemu_loadvm_state(f); + ret =3D qemu_loadvm_state(f, errp); qemu_fclose(f); if (ret < 0) { - error_setg(errp, "loading Xen device state failed"); + error_prepend(errp, "loading Xen device state failed: "); } migration_incoming_state_destroy(); } @@ -3571,13 +3578,12 @@ bool load_snapshot(const char *name, const char *vm= state, ret =3D -EINVAL; goto err_drain; } - ret =3D qemu_loadvm_state(f); + ret =3D qemu_loadvm_state(f, errp); migration_incoming_state_destroy(); =20 bdrv_drain_all_end(); =20 if (ret < 0) { - error_setg(errp, "Error %d while loading VM state", ret); return false; } =20 diff --git a/migration/savevm.h b/migration/savevm.h index 2d5e9c716686f06720325e82fe90c75335ced1de..b80770b7461a60e2ad6ba5e24a7= baeae73d90955 100644 --- a/migration/savevm.h +++ b/migration/savevm.h @@ -64,7 +64,7 @@ void qemu_savevm_send_colo_enable(QEMUFile *f); void qemu_savevm_live_state(QEMUFile *f); int qemu_save_device_state(QEMUFile *f); =20 -int qemu_loadvm_state(QEMUFile *f); +int qemu_loadvm_state(QEMUFile *f, Error **errp); void qemu_loadvm_state_cleanup(MigrationIncomingState *mis); int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis); int qemu_load_device_state(QEMUFile *f); --=20 2.50.1