1 files changed, 47 insertions, 2 deletions
diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c
index fd0c50d..e6791de 100644
--- a/hw/audio/virtio-snd.c
+++ b/hw/audio/virtio-snd.c
@@ -447,6 +447,47 @@ static const char *print_code(uint32_t code)
 };
 
 /*
+ * Handles VIRTIO_SND_R_PCM_START.
+ *
+ * @s: VirtIOSound device
+ * @cmd: The request command queue element from VirtIOSound cmdq field
+ * @start: whether to start or stop the device
+ */
+static void virtio_snd_handle_pcm_start_stop(VirtIOSound *s,
+                                             virtio_snd_ctrl_command *cmd,
+                                             bool start)
+{
+    VirtIOSoundPCMStream *stream;
+    virtio_snd_pcm_hdr req;
+    uint32_t stream_id;
+    size_t msg_sz = iov_to_buf(cmd->elem->out_sg,
+                               cmd->elem->out_num,
+                               0,
+                               &req,
+                               sizeof(virtio_snd_pcm_hdr));
+
+    if (msg_sz != sizeof(virtio_snd_pcm_hdr)) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                "%s: virtio-snd command size incorrect %zu vs \
+                %zu\n", __func__, msg_sz, sizeof(virtio_snd_pcm_hdr));
+        cmd->resp.code = cpu_to_le32(VIRTIO_SND_S_BAD_MSG);
+        return;
+    }
+
+    stream_id = le32_to_cpu(req.stream_id);
+    cmd->resp.code = cpu_to_le32(VIRTIO_SND_S_OK);
+    trace_virtio_snd_handle_pcm_start_stop(start ? "VIRTIO_SND_R_PCM_START" :
+            "VIRTIO_SND_R_PCM_STOP", stream_id);
+    stream = virtio_snd_pcm_get_stream(s, stream_id);
+    if (stream == NULL) {
+        error_report("Invalid stream id: %"PRIu32, req.stream_id);
+        cmd->resp.code = cpu_to_le32(VIRTIO_SND_S_BAD_MSG);
+        return;
+    }
+    stream->active = start;
+}
+
+/*
  * The actual processing done in virtio_snd_process_cmdq().
  *
  * @s: VirtIOSound device
@@ -486,10 +527,14 @@ process_cmd(VirtIOSound *s, virtio_snd_ctrl_command *cmd)
     case VIRTIO_SND_R_PCM_INFO:
         virtio_snd_handle_pcm_info(s, cmd);
         break;
-    case VIRTIO_SND_R_PCM_SET_PARAMS:
-    case VIRTIO_SND_R_PCM_PREPARE:
     case VIRTIO_SND_R_PCM_START:
+        virtio_snd_handle_pcm_start_stop(s, cmd, true);
+        break;
     case VIRTIO_SND_R_PCM_STOP:
+        virtio_snd_handle_pcm_start_stop(s, cmd, false);
+        break;
+    case VIRTIO_SND_R_PCM_SET_PARAMS:
+    case VIRTIO_SND_R_PCM_PREPARE:
     case VIRTIO_SND_R_PCM_RELEASE:
         cmd->resp.code = cpu_to_le32(VIRTIO_SND_S_NOT_SUPP);
         break;