Patch Detail

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{
    "id": 2194081,
    "url": "http://patchwork.ozlabs.org/api/patches/2194081/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260206-colo_unit_test_multifd-v6-3-27779dda139d@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-v6-3-27779dda139d@web.de>",
    "list_archive_url": null,
    "date": "2026-02-06T20:03:01",
    "name": "[v6,03/18] colo: Setup ram cache in normal migration path",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "ac9c36345f860e5b47d8f79b0656d79c14799cd5",
    "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-v6-3-27779dda139d@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/2194081/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2194081/checks/",
    "tags": {},
    "related": [],
    "headers": {
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        "X-UI-Sender-Class": "814a7b36-bfc1-4dae-8640-3722d8ec6cd6",
        "From": "Lukas Straub <lukasstraub2@web.de>",
        "Date": "Fri, 06 Feb 2026 21:03:01 +0100",
        "Subject": "[PATCH v6 03/18] colo: Setup ram cache in normal migration path",
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        "Message-Id": "<20260206-colo_unit_test_multifd-v6-3-27779dda139d@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": "Since\n121ccedc2b migration: block incoming colo when capability is disabled\n\nx-colo capability needs to be always enabled on the incoming side.\nSo migration_incoming_colo_enabled() and migrate_colo() are equivalent\nwith migrate_colo() being easier to reason about since it is always true\nduring the whole migration.\n\nUse migrate_colo() to initialize the ram cache in the normal migration path.\n\nReviewed-by: Fabiano Rosas <farosas@suse.de>\nSigned-off-by: Lukas Straub <lukasstraub2@web.de>\n---\n migration/migration.c | 18 ++++++++++++++----\n migration/savevm.c    | 14 +-------------\n 2 files changed, 15 insertions(+), 17 deletions(-)",
    "diff": "diff --git a/migration/migration.c b/migration/migration.c\nindex b103a82fc0b83009d01d238ff16c0a542d83509f..a73d842ad8b060dc84273ade36ef7dc8b87421f3 100644\n--- a/migration/migration.c\n+++ b/migration/migration.c\n@@ -630,10 +630,6 @@ int migration_incoming_enable_colo(Error **errp)\n         return -EINVAL;\n     }\n \n-    if (ram_block_discard_disable(true)) {\n-        error_setg(errp, \"COLO: cannot disable RAM discard\");\n-        return -EBUSY;\n-    }\n     migration_colo_enabled = true;\n     return 0;\n }\n@@ -770,6 +766,20 @@ process_incoming_migration_co(void *opaque)\n \n     assert(mis->from_src_file);\n \n+    if (migrate_colo()) {\n+        if (ram_block_discard_disable(true)) {\n+            error_setg(&local_err, \"COLO: cannot disable RAM discard\");\n+            goto fail;\n+        }\n+\n+        ret = colo_init_ram_cache(&local_err);\n+        if (ret) {\n+            error_prepend(&local_err, \"failed to init colo RAM cache: %d: \",\n+                          ret);\n+            goto fail;\n+        }\n+    }\n+\n     mis->largest_page_size = qemu_ram_pagesize_largest();\n     postcopy_state_set(POSTCOPY_INCOMING_NONE);\n     migrate_set_state(&mis->state, MIGRATION_STATUS_SETUP,\ndiff --git a/migration/savevm.c b/migration/savevm.c\nindex 3dc812a7bbb4e8f5321114c9919d4619798fed5e..0353ac2d0de819b6547a1f771e6a4c3b8fb1e4ef 100644\n--- a/migration/savevm.c\n+++ b/migration/savevm.c\n@@ -2407,19 +2407,7 @@ static int loadvm_process_enable_colo(MigrationIncomingState *mis,\n                                       Error **errp)\n {\n     ERRP_GUARD();\n-    int ret;\n-\n-    ret = migration_incoming_enable_colo(errp);\n-    if (ret < 0) {\n-        return ret;\n-    }\n-\n-    ret = colo_init_ram_cache(errp);\n-    if (ret) {\n-        error_prepend(errp, \"failed to init colo RAM cache: %d: \", ret);\n-        migration_incoming_disable_colo();\n-    }\n-    return ret;\n+    return migration_incoming_enable_colo(errp);\n }\n \n static int loadvm_postcopy_handle_switchover_start(Error **errp)\n",
    "prefixes": [
        "v6",
        "03/18"
    ]
}