qemu: Add bps_max and friends QMP suport

Detect if the the qemu binary currently in use support the bps_max option,
If yes add it to the command, if not, just ignore the option.
We don't print error here, because the check for invalide arguments
has alerady been made in qemu_driver.c
Signed-off-by: NMatthias Gatto <matthias.gatto@outscale.com>

src/qemu/qemu_monitor_json.c

@@ -4280,6 +4280,12 @@ int qemuMonitorJSONOpenGraphics(qemuMonitorPtr mon,
 }
 
 
+#define GET_THROTTLE_STATS_OPTIONAL(FIELD, STORE)                             \
+    if (virJSONValueObjectGetNumberUlong(inserted,                            \
+                                         FIELD,                               \
+                                         &reply->STORE) < 0) {                \
+        reply->STORE = 0;                                                     \
+    }
 #define GET_THROTTLE_STATS(FIELD, STORE)                                      \
     if (virJSONValueObjectGetNumberUlong(inserted,                            \
                                          FIELD,                               \
@@ -4294,7 +4300,7 @@ static int
 qemuMonitorJSONBlockIoThrottleInfo(virJSONValuePtr result,
                                    const char *device,
                                    virDomainBlockIoTuneInfoPtr reply,
-                                   bool supportMaxOptions ATTRIBUTE_UNUSED)
+                                   bool supportMaxOptions)
 {
     virJSONValuePtr io_throttle;
     int ret = -1;
@@ -4346,6 +4352,15 @@ qemuMonitorJSONBlockIoThrottleInfo(virJSONValuePtr result,
         GET_THROTTLE_STATS("iops", total_iops_sec);
         GET_THROTTLE_STATS("iops_rd", read_iops_sec);
         GET_THROTTLE_STATS("iops_wr", write_iops_sec);
+        if (supportMaxOptions) {
+            GET_THROTTLE_STATS_OPTIONAL("bps_max", total_bytes_sec_max);
+            GET_THROTTLE_STATS_OPTIONAL("bps_rd_max", read_bytes_sec_max);
+            GET_THROTTLE_STATS_OPTIONAL("bps_wr_max", write_bytes_sec_max);
+            GET_THROTTLE_STATS_OPTIONAL("iops_max", total_iops_sec_max);
+            GET_THROTTLE_STATS_OPTIONAL("iops_rd_max", read_iops_sec_max);
+            GET_THROTTLE_STATS_OPTIONAL("iops_wr_max", write_iops_sec_max);
+            GET_THROTTLE_STATS_OPTIONAL("iops_size", size_iops_sec);
+        }
 
         break;
     }
@@ -4362,25 +4377,47 @@ qemuMonitorJSONBlockIoThrottleInfo(virJSONValuePtr result,
     return ret;
 }
 #undef GET_THROTTLE_STATS
+#undef GET_THROTTLE_STATS_OPTIONAL
 
 int qemuMonitorJSONSetBlockIoThrottle(qemuMonitorPtr mon,
                                       const char *device,
                                       virDomainBlockIoTuneInfoPtr info,
-                                      bool supportMaxOptions ATTRIBUTE_UNUSED)
+                                      bool supportMaxOptions)
 {
     int ret = -1;
     virJSONValuePtr cmd = NULL;
     virJSONValuePtr result = NULL;
 
-    cmd = qemuMonitorJSONMakeCommand("block_set_io_throttle",
-                                     "s:device", device,
-                                     "U:bps", info->total_bytes_sec,
-                                     "U:bps_rd", info->read_bytes_sec,
-                                     "U:bps_wr", info->write_bytes_sec,
-                                     "U:iops", info->total_iops_sec,
-                                     "U:iops_rd", info->read_iops_sec,
-                                     "U:iops_wr", info->write_iops_sec,
-                                     NULL);
+    /* The qemu capability check has already been made in
+     * qemuDomainSetBlockIoTune */
+    if (supportMaxOptions) {
+        cmd = qemuMonitorJSONMakeCommand("block_set_io_throttle",
+                                         "s:device", device,
+                                         "U:bps", info->total_bytes_sec,
+                                         "U:bps_rd", info->read_bytes_sec,
+                                         "U:bps_wr", info->write_bytes_sec,
+                                         "U:iops", info->total_iops_sec,
+                                         "U:iops_rd", info->read_iops_sec,
+                                         "U:iops_wr", info->write_iops_sec,
+                                         "U:bps_max", info->total_bytes_sec_max,
+                                         "U:bps_rd_max", info->read_bytes_sec_max,
+                                         "U:bps_wr_max", info->write_bytes_sec_max,
+                                         "U:iops_max", info->total_iops_sec_max,
+                                         "U:iops_rd_max", info->read_iops_sec_max,
+                                         "U:iops_wr_max", info->write_iops_sec_max,
+                                         "U:iops_size", info->size_iops_sec,
+                                         NULL);
+    } else {
+        cmd = qemuMonitorJSONMakeCommand("block_set_io_throttle",
+                                         "s:device", device,
+                                         "U:bps", info->total_bytes_sec,
+                                         "U:bps_rd", info->read_bytes_sec,
+                                         "U:bps_wr", info->write_bytes_sec,
+                                         "U:iops", info->total_iops_sec,
+                                         "U:iops_rd", info->read_iops_sec,
+                                         "U:iops_wr", info->write_iops_sec,
+                                         NULL);
+    }
     if (!cmd)
         return -1;