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{
    "id": 2195200,
    "url": "http://patchwork.ozlabs.org/api/patches/2195200/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260210-colo_unit_test_multifd-v7-18-23bd32f36828@web.de/",
    "project": {
        "id": 14,
        "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api",
        "name": "QEMU Development",
        "link_name": "qemu-devel",
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    "msgid": "<20260210-colo_unit_test_multifd-v7-18-23bd32f36828@web.de>",
    "list_archive_url": null,
    "date": "2026-02-10T14:26:30",
    "name": "[v7,18/18] qemu-colo.rst: Simplify the block replication setup",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "e068c6a5f11fbd5fead9c91524bca08ba4234d7b",
    "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/20260210-colo_unit_test_multifd-v7-18-23bd32f36828@web.de/mbox/",
    "series": [
        {
            "id": 491685,
            "url": "http://patchwork.ozlabs.org/api/series/491685/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491685",
            "date": "2026-02-10T14:26:13",
            "name": "migration: Add COLO multifd support and COLO migration unit test",
            "version": 7,
            "mbox": "http://patchwork.ozlabs.org/series/491685/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2195200/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2195200/checks/",
    "tags": {},
    "related": [],
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        "X-UI-Sender-Class": "814a7b36-bfc1-4dae-8640-3722d8ec6cd6",
        "From": "Lukas Straub <lukasstraub2@web.de>",
        "Date": "Tue, 10 Feb 2026 15:26:30 +0100",
        "Subject": "[PATCH v7 18/18] qemu-colo.rst: Simplify the block replication setup",
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        "Message-Id": "<20260210-colo_unit_test_multifd-v7-18-23bd32f36828@web.de>",
        "References": "<20260210-colo_unit_test_multifd-v7-0-23bd32f36828@web.de>",
        "In-Reply-To": "<20260210-colo_unit_test_multifd-v7-0-23bd32f36828@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": "On the primary side we don't actually need the replication\nblock driver, since it only passes trough all IO.\nSo simplify the setup and also use 'blockdev-add' instead of\n'human-monitor-command'.\n\nThis is how my clients use colo in production.\n\nSigned-off-by: Lukas Straub <lukasstraub2@web.de>\n---\n docs/system/qemu-colo.rst | 14 +++++++-------\n 1 file changed, 7 insertions(+), 7 deletions(-)",
    "diff": "diff --git a/docs/system/qemu-colo.rst b/docs/system/qemu-colo.rst\nindex 75abbd80298df79223cb8e70064a5dc83d70f4eb..f7d3b6439cf3401a58c412634239d1a43999a10e 100644\n--- a/docs/system/qemu-colo.rst\n+++ b/docs/system/qemu-colo.rst\n@@ -240,8 +240,8 @@ Note:\n **4.** On Primary VM's QEMU monitor, issue command::\n \n     {\"execute\":\"qmp_capabilities\"}\n-    {\"execute\": \"human-monitor-command\", \"arguments\": {\"command-line\": \"drive_add -n buddy driver=replication,mode=primary,file.driver=nbd,file.host=127.0.0.2,file.port=9999,file.export=parent0,node-name=replication0\"}}\n-    {\"execute\": \"x-blockdev-change\", \"arguments\":{\"parent\": \"colo-disk0\", \"node\": \"replication0\" } }\n+    {\"execute\": \"blockdev-add\", \"arguments\": {\"driver\": \"nbd\", \"node-name\": \"nbd0\", \"server\": {\"type\": \"inet\", \"host\": \"127.0.0.2\", \"port\": \"9999\"}, \"export\": \"parent0\", \"detect-zeroes\": \"on\"} }\n+    {\"execute\": \"x-blockdev-change\", \"arguments\":{\"parent\": \"colo-disk0\", \"node\": \"nbd0\" } }\n     {\"execute\": \"migrate-set-capabilities\", \"arguments\": {\"capabilities\": [ {\"capability\": \"x-colo\", \"state\": true } ] } }\n     {\"execute\": \"migrate\", \"arguments\": {\"uri\": \"tcp:127.0.0.2:9998\" } }\n \n@@ -269,7 +269,7 @@ Primary Failover\n The Secondary died, resume on the Primary::\n \n     {\"execute\": \"x-blockdev-change\", \"arguments\":{ \"parent\": \"colo-disk0\", \"child\": \"children.1\"} }\n-    {\"execute\": \"human-monitor-command\", \"arguments\":{ \"command-line\": \"drive_del replication0\" } }\n+    {\"execute\": \"blockdev-del\", \"arguments\": {\"node-name\": \"nbd0\"} }\n     {\"execute\": \"object-del\", \"arguments\":{ \"id\": \"comp0\" } }\n     {\"execute\": \"object-del\", \"arguments\":{ \"id\": \"iothread1\" } }\n     {\"execute\": \"object-del\", \"arguments\":{ \"id\": \"m0\" } }\n@@ -309,8 +309,8 @@ Wait until disk is synced, then::\n     {\"execute\": \"stop\"}\n     {\"execute\": \"block-job-cancel\", \"arguments\":{ \"device\": \"resync\"} }\n \n-    {\"execute\": \"human-monitor-command\", \"arguments\":{ \"command-line\": \"drive_add -n buddy driver=replication,mode=primary,file.driver=nbd,file.host=127.0.0.2,file.port=9999,file.export=parent0,node-name=replication0\"}}\n-    {\"execute\": \"x-blockdev-change\", \"arguments\":{ \"parent\": \"colo-disk0\", \"node\": \"replication0\" } }\n+    {\"execute\": \"blockdev-add\", \"arguments\": {\"driver\": \"nbd\", \"node-name\": \"nbd0\", \"server\": {\"type\": \"inet\", \"host\": \"127.0.0.2\", \"port\": \"9999\"}, \"export\": \"parent0\", \"detect-zeroes\": \"on\"} }\n+    {\"execute\": \"x-blockdev-change\", \"arguments\":{ \"parent\": \"colo-disk0\", \"node\": \"nbd0\" } }\n \n     {\"execute\": \"object-add\", \"arguments\":{ \"qom-type\": \"filter-mirror\", \"id\": \"m0\", \"netdev\": \"hn0\", \"queue\": \"tx\", \"outdev\": \"mirror0\" } }\n     {\"execute\": \"object-add\", \"arguments\":{ \"qom-type\": \"filter-redirector\", \"id\": \"redire0\", \"netdev\": \"hn0\", \"queue\": \"rx\", \"indev\": \"compare_out\" } }\n@@ -341,8 +341,8 @@ Wait until disk is synced, then::\n     {\"execute\": \"stop\"}\n     {\"execute\": \"block-job-cancel\", \"arguments\":{ \"device\": \"resync\" } }\n \n-    {\"execute\": \"human-monitor-command\", \"arguments\":{ \"command-line\": \"drive_add -n buddy driver=replication,mode=primary,file.driver=nbd,file.host=127.0.0.1,file.port=9999,file.export=parent0,node-name=replication0\"}}\n-    {\"execute\": \"x-blockdev-change\", \"arguments\":{ \"parent\": \"colo-disk0\", \"node\": \"replication0\" } }\n+    {\"execute\": \"blockdev-add\", \"arguments\": {\"driver\": \"nbd\", \"node-name\": \"nbd0\", \"server\": {\"type\": \"inet\", \"host\": \"127.0.0.1\", \"port\": \"9999\"}, \"export\": \"parent0\", \"detect-zeroes\": \"on\"} }\n+    {\"execute\": \"x-blockdev-change\", \"arguments\":{ \"parent\": \"colo-disk0\", \"node\": \"nbd0\" } }\n \n     {\"execute\": \"object-add\", \"arguments\":{ \"qom-type\": \"filter-mirror\", \"id\": \"m0\", \"insert\": \"before\", \"position\": \"id=rew0\", \"netdev\": \"hn0\", \"queue\": \"tx\", \"outdev\": \"mirror0\" } }\n     {\"execute\": \"object-add\", \"arguments\":{ \"qom-type\": \"filter-redirector\", \"id\": \"redire0\", \"insert\": \"before\", \"position\": \"id=rew0\", \"netdev\": \"hn0\", \"queue\": \"rx\", \"indev\": \"compare_out\" } }\n",
    "prefixes": [
        "v7",
        "18/18"
    ]
}