hw/virtio: add some vhost-user trace events

These are useful for tracing the lifetime of vhost-user connections.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220802095010.3330793-10-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 20af2e7..887ca7a 100644 (file)
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -8,6 +8,10 @@ vhost_region_add_section_aligned(const char *name, uint64_t gpa, uint64_t size,
 vhost_section(const char *name) "%s"
 vhost_reject_section(const char *name, int d) "%s:%d"
 vhost_iotlb_miss(void *dev, int step) "%p step %d"
+vhost_dev_cleanup(void *dev) "%p"
+vhost_dev_start(void *dev, const char *name) "%p:%s"
+vhost_dev_stop(void *dev, const char *name) "%p:%s"
+
 
 # vhost-user.c
 vhost_user_postcopy_end_entry(void) ""

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index f758f17..5185c15 100644 (file)
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1477,6 +1477,8 @@ void vhost_dev_cleanup(struct vhost_dev *hdev)
 {
     int i;
 
+    trace_vhost_dev_cleanup(hdev);
+
     for (i = 0; i < hdev->nvqs; ++i) {
         vhost_virtqueue_cleanup(hdev->vqs + i);
     }
@@ -1783,6 +1785,8 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
     /* should only be called after backend is connected */
     assert(hdev->vhost_ops);
 
+    trace_vhost_dev_start(hdev, vdev->name);
+
     vdev->vhost_started = true;
     hdev->started = true;
     hdev->vdev = vdev;
@@ -1869,6 +1873,8 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
     /* should only be called after backend is connected */
     assert(hdev->vhost_ops);
 
+    trace_vhost_dev_stop(hdev, vdev->name);
+
     if (hdev->vhost_ops->vhost_dev_start) {
         hdev->vhost_ops->vhost_dev_start(hdev, false);
     }