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GET /api/patches/2227469/?format=api
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{
    "id": 2227469,
    "url": "http://patchwork.ozlabs.org/api/patches/2227469/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260423191958.1440-30-farosas@suse.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",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<20260423191958.1440-30-farosas@suse.de>",
    "list_archive_url": null,
    "date": "2026-04-23T19:19:43",
    "name": "[PULL,29/43] vmstate: Introduce vmstate_save_field_with_vmdesc()",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "7a6c5061a88ed85561e9309ab42c43b5243267ac",
    "submitter": {
        "id": 85343,
        "url": "http://patchwork.ozlabs.org/api/people/85343/?format=api",
        "name": "Fabiano Rosas",
        "email": "farosas@suse.de"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260423191958.1440-30-farosas@suse.de/mbox/",
    "series": [
        {
            "id": 501236,
            "url": "http://patchwork.ozlabs.org/api/series/501236/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501236",
            "date": "2026-04-23T19:19:14",
            "name": "[PULL,01/43] checkpatch: Allow spaces after all coroutine annotations",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/501236/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2227469/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2227469/checks/",
    "tags": {},
    "related": [],
    "headers": {
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        ],
        "From": "Fabiano Rosas <farosas@suse.de>",
        "To": "qemu-devel@nongnu.org",
        "Cc": "Peter Xu <peterx@redhat.com>,\n Alexander Mikhalitsyn <aleksandr.mikhalitsyn@futurfusion.io>,\n Juraj Marcin <jmarcin@redhat.com>",
        "Subject": "[PULL 29/43] vmstate: Introduce vmstate_save_field_with_vmdesc()",
        "Date": "Thu, 23 Apr 2026 16:19:43 -0300",
        "Message-ID": "<20260423191958.1440-30-farosas@suse.de>",
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    },
    "content": "From: Peter Xu <peterx@redhat.com>\n\nIntroduce a helper to do both the JSON blob generations and save vmstate.\nThis further shrinks the function a bit.  More importantly, we'll need to\nsave two fields in one loop very soon in the future with the JSON blob.\n\nReviewed-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@futurfusion.io>\nReviewed-by: Fabiano Rosas <farosas@suse.de>\nSigned-off-by: Peter Xu <peterx@redhat.com>\nReviewed-by: Juraj Marcin <jmarcin@redhat.com>\nLink: https://lore.kernel.org/qemu-devel/20260401202844.673494-7-peterx@redhat.com\nSigned-off-by: Fabiano Rosas <farosas@suse.de>\n---\n migration/vmstate.c | 45 ++++++++++++++++++++++++++++++++-------------\n 1 file changed, 32 insertions(+), 13 deletions(-)",
    "diff": "diff --git a/migration/vmstate.c b/migration/vmstate.c\nindex 05badef42f..b274204e66 100644\n--- a/migration/vmstate.c\n+++ b/migration/vmstate.c\n@@ -514,6 +514,35 @@ static bool vmstate_save_field(QEMUFile *f, void *pv, size_t size,\n     return true;\n }\n \n+/*\n+ * Save a whole VMSD field, including its JSON blob separately when @vmdesc\n+ * is specified.\n+ */\n+static inline bool\n+vmstate_save_field_with_vmdesc(QEMUFile *f, void *pv, size_t size,\n+                               const VMStateDescription *vmsd,\n+                               const VMStateField *field, JSONWriter *vmdesc,\n+                               int i, int max, Error **errp)\n+{\n+    uint64_t old_offset, written_bytes;\n+    bool ok;\n+\n+    vmsd_desc_field_start(vmsd, vmdesc, field, i, max);\n+\n+    old_offset = qemu_file_transferred(f);\n+    ok = vmstate_save_field(f, pv, size, field, vmdesc, errp);\n+    written_bytes = qemu_file_transferred(f) - old_offset;\n+\n+    vmsd_desc_field_end(vmsd, vmdesc, field, written_bytes);\n+\n+    if (!ok) {\n+        error_prepend(errp, \"Save of field %s/%s failed: \",\n+                      vmsd->name, field->name);\n+    }\n+\n+    return ok;\n+}\n+\n static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n                                 void *opaque, JSONWriter *vmdesc,\n                                 int version_id, Error **errp)\n@@ -542,7 +571,6 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n             void *first_elem = opaque + field->offset;\n             int i, n_elems = vmstate_n_elems(opaque, field);\n             int size = vmstate_size(opaque, field);\n-            uint64_t old_offset, written_bytes;\n             JSONWriter *vmdesc_loop = vmdesc;\n             bool is_prev_null = false;\n \n@@ -559,7 +587,6 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n                 /* maximum number of elements to compress in the JSON blob */\n                 int max_elems = vmsd_can_compress(field) ? (n_elems - i) : 1;\n \n-                old_offset = qemu_file_transferred(f);\n                 if (field->flags & VMS_ARRAY_OF_POINTER) {\n                     assert(curr_elem);\n                     curr_elem = *(void **)curr_elem;\n@@ -606,15 +633,9 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n                     }\n                 }\n \n-                vmsd_desc_field_start(vmsd, vmdesc_loop, inner_field,\n-                                      i, max_elems);\n-\n-                ok = vmstate_save_field(f, curr_elem, size, inner_field,\n-                                        vmdesc_loop, errp);\n-\n-                written_bytes = qemu_file_transferred(f) - old_offset;\n-                vmsd_desc_field_end(vmsd, vmdesc_loop, inner_field,\n-                                    written_bytes);\n+                ok = vmstate_save_field_with_vmdesc(f, curr_elem, size, vmsd,\n+                                                    inner_field, vmdesc_loop,\n+                                                    i, max_elems, errp);\n \n                 /* If we used a fake temp field.. free it now */\n                 if (is_null) {\n@@ -622,8 +643,6 @@ static bool vmstate_save_vmsd_v(QEMUFile *f, const VMStateDescription *vmsd,\n                 }\n \n                 if (!ok) {\n-                    error_prepend(errp, \"Save of field %s/%s failed: \",\n-                                  vmsd->name, field->name);\n                     goto out;\n                 }\n \n",
    "prefixes": [
        "PULL",
        "29/43"
    ]
}