{"id":2197913,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2197913/?format=json","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.0/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260218-colo_unit_test_multifd-v9-10-d8dbdb0ca6f6@web.de>","date":"2026-02-18T21:29:30","name":"[v9,10/19] colo: Fix crash during device vmstate load","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"51062298277dd3c0cd2d3a1be21443294b4c998f","submitter":{"id":76468,"url":"http://patchwork.ozlabs.org/api/1.0/people/76468/?format=json","name":"Lukas Straub","email":"lukasstraub2@web.de"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260218-colo_unit_test_multifd-v9-10-d8dbdb0ca6f6@web.de/mbox/","series":[{"id":492617,"url":"http://patchwork.ozlabs.org/api/1.0/series/492617/?format=json","date":"2026-02-18T21:29:37","name":"migration: Add COLO multifd support and COLO migration unit test","version":9,"mbox":"http://patchwork.ozlabs.org/series/492617/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2197913/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=web.de header.i=lukasstraub2@web.de header.a=rsa-sha256\n header.s=s29768273 header.b=phlR9fGh;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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hIpG8vi1wjl690vqEA==","X-UI-Sender-Class":"814a7b36-bfc1-4dae-8640-3722d8ec6cd6","From":"Lukas Straub ","Date":"Wed, 18 Feb 2026 22:29:30 +0100","Subject":"[PATCH v9 10/19] colo: Fix crash during device vmstate load","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"quoted-printable","Message-Id":"<20260218-colo_unit_test_multifd-v9-10-d8dbdb0ca6f6@web.de>","References":"<20260218-colo_unit_test_multifd-v9-0-d8dbdb0ca6f6@web.de>","In-Reply-To":"<20260218-colo_unit_test_multifd-v9-0-d8dbdb0ca6f6@web.de>","To":"qemu-devel@nongnu.org","Cc":"Peter Xu , Fabiano Rosas ,\n Laurent Vivier , Paolo Bonzini ,\n Zhang Chen ,\n Hailiang Zhang ,\n Markus Armbruster , Li Zhijian ,\n \"Dr. David Alan Gilbert\" ,\n Lukas Straub ","X-Mailer":"b4 0.14.2","X-Developer-Signature":"v=1; a=openpgp-sha256; l=1224; i=lukasstraub2@web.de;\n h=from:subject:message-id; bh=Jo9ygbD9kqkeUyQ0JD+anPkAvVD/vEUQ7S+iY6iqDJE=;\n 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client-ip=212.227.15.3; envelope-from=lukasstraub2@web.de;\n helo=mout.web.de","X-Spam_score_int":"-24","X-Spam_score":"-2.5","X-Spam_bar":"--","X-Spam_report":"(-2.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7,\n RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"With colo we load device vmstate during each checkpoint, on top of\na vm that was already running. Some devices expect a reset before\nloading vmstate on such a previously running vm.\n\nThis fixes a crash when using COLO with Q35 machine.\n\nThe reset adds 10-20ms overhead to the checkpointing proces in my\ntesting.\n\nReviewed-by: Peter Xu \nSigned-off-by: Lukas Straub \n---\n migration/colo.c | 6 ++++++\n 1 file changed, 6 insertions(+)","diff":"diff --git a/migration/colo.c b/migration/colo.c\nindex 96102c9d0fb3b60e063c81ce07b730011bc4919f..dc7cfa81ef7db78e3ee372642de48567c5bc06eb 100644\n--- a/migration/colo.c\n+++ b/migration/colo.c\n@@ -729,6 +729,12 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,\n \n bql_lock();\n vmstate_loading = true;\n+ /*\n+ * With colo we load device vmstate during each checkpoint, on top of\n+ * a vm that was already running. Some devices expect a reset before\n+ * loading vmstate on such a previously running vm.\n+ */\n+ qemu_system_reset(SHUTDOWN_CAUSE_SNAPSHOT_LOAD);\n colo_flush_ram_cache();\n ret = qemu_load_device_state(fb, errp);\n if (ret < 0) {\n","prefixes":["v9","10/19"]}