Patch Detail

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{
    "id": 2194095,
    "url": "http://patchwork.ozlabs.org/api/patches/2194095/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260206-colo_unit_test_multifd-v6-11-27779dda139d@web.de/",
    "project": {
        "id": 14,
        "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api",
        "name": "QEMU Development",
        "link_name": "qemu-devel",
        "list_id": "qemu-devel.nongnu.org",
        "list_email": "qemu-devel@nongnu.org",
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    "msgid": "<20260206-colo_unit_test_multifd-v6-11-27779dda139d@web.de>",
    "list_archive_url": null,
    "date": "2026-02-06T20:03:09",
    "name": "[v6,11/18] 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/people/76468/?format=api",
        "name": "Lukas Straub",
        "email": "lukasstraub2@web.de"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260206-colo_unit_test_multifd-v6-11-27779dda139d@web.de/mbox/",
    "series": [
        {
            "id": 491328,
            "url": "http://patchwork.ozlabs.org/api/series/491328/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491328",
            "date": "2026-02-06T20:02:58",
            "name": "migration: Add COLO multifd support and COLO migration unit test",
            "version": 6,
            "mbox": "http://patchwork.ozlabs.org/series/491328/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2194095/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2194095/checks/",
    "tags": {},
    "related": [],
    "headers": {
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        "From": "Lukas Straub <lukasstraub2@web.de>",
        "Date": "Fri, 06 Feb 2026 21:03:09 +0100",
        "Subject": "[PATCH v6 11/18] colo: Fix crash during device vmstate load",
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        "Message-Id": "<20260206-colo_unit_test_multifd-v6-11-27779dda139d@web.de>",
        "References": "<20260206-colo_unit_test_multifd-v6-0-27779dda139d@web.de>",
        "In-Reply-To": "<20260206-colo_unit_test_multifd-v6-0-27779dda139d@web.de>",
        "To": "qemu-devel@nongnu.org",
        "Cc": "Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>,\n Laurent Vivier <lvivier@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>,\n Zhang Chen <zhangckid@gmail.com>,\n Hailiang Zhang <zhanghailiang@xfusion.com>,\n Markus Armbruster <armbru@redhat.com>, Li Zhijian <lizhijian@fujitsu.com>,\n \"Dr. David Alan Gilbert\" <dave@treblig.org>,\n Lukas Straub <lukasstraub2@web.de>",
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    },
    "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 <peterx@redhat.com>\nSigned-off-by: Lukas Straub <lukasstraub2@web.de>\n---\n migration/colo.c | 6 ++++++\n 1 file changed, 6 insertions(+)",
    "diff": "diff --git a/migration/colo.c b/migration/colo.c\nindex d3534d1a32ad82f02101ac092ebf818a0caee6f2..afab8eeb14d09c1db9b235121c5845b11a80deba 100644\n--- a/migration/colo.c\n+++ b/migration/colo.c\n@@ -727,6 +727,12 @@ 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": [
        "v6",
        "11/18"
    ]
}