qemu: Avoid deprecated query-migrate-cache-size QMP command

The same functionality can be achieved using query-migrate-parameters
QMP command and checking the xbzrle-cache-size parameter.

https://bugzilla.redhat.com/show_bug.cgi?id=1829544

Signed-off-by: Jiri Denemark <[email protected]>
Reviewed-by: Peter Krempa <[email protected]>

Author: Jiri Denemark

src/qemu/qemu_driver.c

@@ -13971,7 +13971,9 @@ qemuDomainMigrateGetCompressionCache(virDomainPtr dom,
     virQEMUDriverPtr driver = dom->conn->privateData;
     virDomainObjPtr vm;
     qemuDomainObjPrivatePtr priv;
+    g_autoptr(qemuMigrationParams) migParams = NULL;
     int ret = -1;
+    int rc;
 
     virCheckFlags(0, -1);
 
@@ -13996,12 +13998,23 @@ qemuDomainMigrateGetCompressionCache(virDomainPtr dom,
         goto endjob;
     }
 
-    qemuDomainObjEnterMonitor(driver, vm);
+    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATION_PARAM_XBZRLE_CACHE_SIZE)) {
+        if (qemuMigrationParamsFetch(driver, vm, QEMU_ASYNC_JOB_NONE,
+                                     &migParams) < 0)
+            goto endjob;
 
-    ret = qemuMonitorGetMigrationCacheSize(priv->mon, cacheSize);
+        if (qemuMigrationParamsGetULL(migParams,
+                                      QEMU_MIGRATION_PARAM_XBZRLE_CACHE_SIZE,
+                                      cacheSize) < 0)
+            goto endjob;
+    } else {
+        qemuDomainObjEnterMonitor(driver, vm);
+        rc = qemuMonitorGetMigrationCacheSize(priv->mon, cacheSize);
+        if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)
+            goto endjob;
+    }
 
-    if (qemuDomainObjExitMonitor(driver, vm) < 0)
-        ret = -1;
+    ret = 0;
 
  endjob:
     qemuDomainObjEndJob(driver, vm);

tests/qemumonitorjsontest.c

@@ -1888,7 +1888,7 @@ testQemuMonitorJSONqemuMonitorJSONGetMigrationCacheSize(const void *opaque)
     if (!(test = qemuMonitorTestNewSchema(xmlopt, data->schema)))
         return -1;
 
-    qemuMonitorTestSkipDeprecatedValidation(test, false);
+    qemuMonitorTestSkipDeprecatedValidation(test, true);
 
     if (qemuMonitorTestAddItem(test, "query-migrate-cache-size",
                                "{"