[libvirt] [REPOST PATCH v2 06/12] qemu: Add monitor functions to set IOThread params

[John Ferlan]

Add functions to set the IOThreadInfo param data for the live guest.
Modify the _qemuMonitorIOThreadInfo to have a flag to indicate when
a value was set so that we don't set a value unless it was desired
to be set.

Based on code originally posted by Pavel Hrdina <phrdina at redhat.com>,
but extracted into a separate patch. Note that qapi expects to receive
integer parameters rather than unsigned long long or unsigned int's.
QEMU does save the value in larger signed 64 bit values eventually.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/qemu/qemu_monitor.c      | 19 +++++++++++++++++++
 src/qemu/qemu_monitor.h      |  5 +++++
 src/qemu/qemu_monitor_json.c | 35 +++++++++++++++++++++++++++++++++++
 src/qemu/qemu_monitor_json.h |  4 ++++
 4 files changed, 63 insertions(+)

diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index 7f7013e115..a65d638ab8 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -4135,6 +4135,25 @@ qemuMonitorGetIOThreads(qemuMonitorPtr mon,
 }
 
 
+/**
+ * qemuMonitorSetIOThread:
+ * @mon: Pointer to the monitor
+ * @iothreadInfo: filled IOThread info with data
+ *
+ * Alter the specified IOThread's IOThreadInfo values.
+ */
+int
+qemuMonitorSetIOThread(qemuMonitorPtr mon,
+                       qemuMonitorIOThreadInfoPtr iothreadInfo)
+{
+    VIR_DEBUG("iothread=%p", iothreadInfo);
+
+    QEMU_CHECK_MONITOR(mon);
+
+    return qemuMonitorJSONSetIOThread(mon, iothreadInfo);
+}
+
+
 /**
  * qemuMonitorGetMemoryDeviceInfo:
  * @mon: pointer to the monitor
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index c2991e2b16..66bfdb0e5c 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -1120,9 +1120,14 @@ struct _qemuMonitorIOThreadInfo {
     unsigned long long poll_max_ns;
     unsigned int poll_grow;
     unsigned int poll_shrink;
+    bool set_poll_max_ns;
+    bool set_poll_grow;
+    bool set_poll_shrink;
 };
 int qemuMonitorGetIOThreads(qemuMonitorPtr mon,
                             qemuMonitorIOThreadInfoPtr **iothreads);
+int qemuMonitorSetIOThread(qemuMonitorPtr mon,
+                           qemuMonitorIOThreadInfoPtr iothreadInfo);
 
 typedef struct _qemuMonitorMemoryDeviceInfo qemuMonitorMemoryDeviceInfo;
 typedef qemuMonitorMemoryDeviceInfo *qemuMonitorMemoryDeviceInfoPtr;
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 2e92984b44..5a806f6c0e 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -7474,6 +7474,41 @@ qemuMonitorJSONGetIOThreads(qemuMonitorPtr mon,
 }
 
 
+int
+qemuMonitorJSONSetIOThread(qemuMonitorPtr mon,
+                           qemuMonitorIOThreadInfoPtr iothreadInfo)
+{
+    int ret = -1;
+    char *path = NULL;
+    qemuMonitorJSONObjectProperty prop;
+
+    if (virAsprintf(&path, "/objects/iothread%u",
+                    iothreadInfo->iothread_id) < 0)
+        goto cleanup;
+
+#define VIR_IOTHREAD_SET_PROP(propName, propVal) \
+    if (iothreadInfo->set_##propVal) { \
+        memset(&prop, 0, sizeof(qemuMonitorJSONObjectProperty)); \
+        prop.type = QEMU_MONITOR_OBJECT_PROPERTY_INT; \
+        prop.val.iv = iothreadInfo->propVal; \
+        if (qemuMonitorJSONSetObjectProperty(mon, path, propName, &prop) < 0) \
+            goto cleanup; \
+    }
+
+    VIR_IOTHREAD_SET_PROP("poll-max-ns", poll_max_ns);
+    VIR_IOTHREAD_SET_PROP("poll-grow", poll_grow);
+    VIR_IOTHREAD_SET_PROP("poll-shrink", poll_shrink);
+
+#undef VIR_IOTHREAD_SET_PROP
+
+    ret = 0;
+
+ cleanup:
+    VIR_FREE(path);
+    return ret;
+}
+
+
 int
 qemuMonitorJSONGetMemoryDeviceInfo(qemuMonitorPtr mon,
                                    virHashTablePtr info)
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index da267b15b0..c3abd0ddf0 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -502,6 +502,10 @@ int qemuMonitorJSONGetIOThreads(qemuMonitorPtr mon,
                                 qemuMonitorIOThreadInfoPtr **iothreads)
     ATTRIBUTE_NONNULL(2);
 
+int qemuMonitorJSONSetIOThread(qemuMonitorPtr mon,
+                               qemuMonitorIOThreadInfoPtr iothreadInfo)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
+
 int qemuMonitorJSONGetMemoryDeviceInfo(qemuMonitorPtr mon,
                                        virHashTablePtr info)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
-- 
2.17.2