[PATCH v4 2/3] job: introduce dump guest memory job

[Hogan Wang]

There's no way to cancel the current executing dump process, lead to the
virtual machine manager daemon((e.g. libvirtd) cannot restore the dump
job after daemon restart.

Introduce dump guest memory job type, and add an optional 'job-id'
argument for dump-guest-memory QMP to make use of jobs framework.

Signed-off-by: Hogan Wang <hogan.wang@huawei.com>
---
 dump/dump-hmp-cmds.c | 12 ++++++++++--
 dump/dump.c          |  1 +
 qapi/dump.json       |  6 +++++-
 qapi/job.json        |  5 ++++-
 4 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/dump/dump-hmp-cmds.c b/dump/dump-hmp-cmds.c
index e5053b04cd..ba28a5e631 100644
--- a/dump/dump-hmp-cmds.c
+++ b/dump/dump-hmp-cmds.c
@@ -24,9 +24,11 @@ void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
     bool has_begin = qdict_haskey(qdict, "begin");
     bool has_length = qdict_haskey(qdict, "length");
     bool has_detach = qdict_haskey(qdict, "detach");
+    bool has_job_id = qdict_haskey(qdict, "job-id");
     int64_t begin = 0;
     int64_t length = 0;
     bool detach = false;
+    const char *job_id = NULL;
     enum DumpGuestMemoryFormat dump_format = DUMP_GUEST_MEMORY_FORMAT_ELF;
     char *prot;
 
@@ -62,10 +64,16 @@ void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
         detach = qdict_get_bool(qdict, "detach");
     }
 
+    if (has_job_id) {
+        job_id = qdict_get_str(qdict, "job-id");
+    }
+
     prot = g_strconcat("file:", file, NULL);
 
-    qmp_dump_guest_memory(paging, prot, true, detach, has_begin, begin,
-                          has_length, length, true, dump_format, &err);
+    qmp_dump_guest_memory(paging, prot, has_job_id, job_id,
+                          true, detach, has_begin, begin,
+                          has_length, length, true, dump_format,
+                          &err);
     hmp_handle_error(mon, err);
     g_free(prot);
 }
diff --git a/dump/dump.c b/dump/dump.c
index a57c580b12..cec9be30b4 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -1895,6 +1895,7 @@ DumpQueryResult *qmp_query_dump(Error **errp)
 }
 
 void qmp_dump_guest_memory(bool paging, const char *file,
+                           bool has_job_id, const char *job_id,
                            bool has_detach, bool detach,
                            bool has_begin, int64_t begin, bool has_length,
                            int64_t length, bool has_format,
diff --git a/qapi/dump.json b/qapi/dump.json
index 90859c5483..d162a9f028 100644
--- a/qapi/dump.json
+++ b/qapi/dump.json
@@ -59,6 +59,9 @@
 #            2. fd: the protocol starts with "fd:", and the following string
 #               is the fd's name.
 #
+# @job-id: identifier for the newly-created memory dump job. To be compatible
+#          with legacy dump process, @job-id should omitted. (Since 7.2)
+#
 # @detach: if true, QMP will return immediately rather than
 #          waiting for the dump to finish. The user can track progress
 #          using "query-dump". (since 2.6).
@@ -88,7 +91,8 @@
 #
 ##
 { 'command': 'dump-guest-memory',
-  'data': { 'paging': 'bool', 'protocol': 'str', '*detach': 'bool',
+  'data': { 'paging': 'bool', 'protocol': 'str',
+            '*job-id': 'str', '*detach': 'bool',
             '*begin': 'int', '*length': 'int',
             '*format': 'DumpGuestMemoryFormat'} }
 
diff --git a/qapi/job.json b/qapi/job.json
index d5f84e9615..e14d2290a5 100644
--- a/qapi/job.json
+++ b/qapi/job.json
@@ -28,11 +28,14 @@
 #
 # @snapshot-delete: snapshot delete job type, see "snapshot-delete" (since 6.0)
 #
+# @dump-guest-memory: dump guest memory job type, see "dump-guest-memory" 
(since 7.2)
+#
 # Since: 1.7
 ##
 { 'enum': 'JobType',
   'data': ['commit', 'stream', 'mirror', 'backup', 'create', 'amend',
-           'snapshot-load', 'snapshot-save', 'snapshot-delete'] }
+           'snapshot-load', 'snapshot-save', 'snapshot-delete',
+           'dump-guest-memory'] }
 
 ##
 # @JobStatus:
-- 
2.33.0