The virtio-sound device is currently not migratable. Add the
missing VMSTATE fields, enable migration and reconnect the audio
streams after migration.
The queue_inuse[] array variables mimic the inuse variable in
struct VirtQueue which is private. They are needed to restart
the virtio queues after migration.
Signed-off-by: Volker Rümelin <vr_q...@t-online.de>
---
hw/audio/virtio-snd.c | 84 +++++++++++++++++++++++++++++++----
include/hw/audio/virtio-snd.h | 1 +
2 files changed, 77 insertions(+), 8 deletions(-)
diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c
index 06a27ef8d9..b0a0ff2456 100644
--- a/hw/audio/virtio-snd.c
+++ b/hw/audio/virtio-snd.c
@@ -25,7 +25,6 @@
#include "hw/audio/virtio-snd.h"
#include "hw/core/cpu.h"
-#define VIRTIO_SOUND_VM_VERSION 1
#define VIRTIO_SOUND_JACK_DEFAULT 0
#define VIRTIO_SOUND_STREAM_DEFAULT 2
#define VIRTIO_SOUND_CHMAP_DEFAULT 0
@@ -79,17 +78,40 @@ static uint32_t supported_rates =
BIT(VIRTIO_SND_PCM_RATE_5512)
| BIT(VIRTIO_SND_PCM_RATE_192000)
| BIT(VIRTIO_SND_PCM_RATE_384000);
+static const VMStateDescription vmstate_virtio_snd_stream = {
+ .name = "virtio-sound-stream",
+ .fields = (const VMStateField[]) {
+ VMSTATE_UINT32(state, VirtIOSoundPCMStream),
+ VMSTATE_UINT32(info.hdr.hda_fn_nid, VirtIOSoundPCMStream),
+ VMSTATE_UINT32(info.features, VirtIOSoundPCMStream),
+ VMSTATE_UINT64(info.formats, VirtIOSoundPCMStream),
+ VMSTATE_UINT64(info.rates, VirtIOSoundPCMStream),
+ VMSTATE_UINT8(info.direction, VirtIOSoundPCMStream),
+ VMSTATE_UINT8(info.channels_min, VirtIOSoundPCMStream),
+ VMSTATE_UINT8(info.channels_max, VirtIOSoundPCMStream),
+ VMSTATE_UINT32(params.buffer_bytes, VirtIOSoundPCMStream),
+ VMSTATE_UINT32(params.period_bytes, VirtIOSoundPCMStream),
+ VMSTATE_UINT32(params.features, VirtIOSoundPCMStream),
+ VMSTATE_UINT8(params.channels, VirtIOSoundPCMStream),
+ VMSTATE_UINT8(params.format, VirtIOSoundPCMStream),
+ VMSTATE_UINT8(params.rate, VirtIOSoundPCMStream),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
static const VMStateDescription vmstate_virtio_snd_device = {
- .name = TYPE_VIRTIO_SND,
- .version_id = VIRTIO_SOUND_VM_VERSION,
- .minimum_version_id = VIRTIO_SOUND_VM_VERSION,
+ .name = "virtio-sound-device",
+ .fields = (const VMStateField[]) {
+ VMSTATE_UINT32_ARRAY(queue_inuse, VirtIOSound, VIRTIO_SND_VQ_MAX),
+ VMSTATE_STRUCT_VARRAY_POINTER_UINT32(streams, VirtIOSound,
+ snd_conf.streams,
+ vmstate_virtio_snd_stream, VirtIOSoundPCMStream),
+ VMSTATE_END_OF_LIST()
+ },
};
static const VMStateDescription vmstate_virtio_snd = {
- .name = TYPE_VIRTIO_SND,
- .unmigratable = 1,
- .minimum_version_id = VIRTIO_SOUND_VM_VERSION,
- .version_id = VIRTIO_SOUND_VM_VERSION,
+ .name = "virtio-sound",
.fields = (const VMStateField[]) {
VMSTATE_VIRTIO_DEVICE,
VMSTATE_END_OF_LIST()
@@ -812,6 +834,7 @@ process_cmd(VirtIOSound *s, virtio_snd_ctrl_command *cmd)
sizeof(virtio_snd_hdr));
virtqueue_push(cmd->vq, cmd->elem,
sizeof(virtio_snd_hdr) + cmd->payload_size);
+ s->queue_inuse[VIRTIO_SND_VQ_CONTROL] -= 1;
virtio_notify(VIRTIO_DEVICE(s), cmd->vq);
}
@@ -858,6 +881,7 @@ static void virtio_snd_handle_ctrl(VirtIODevice *vdev,
VirtQueue *vq)
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
while (elem) {
+ s->queue_inuse[VIRTIO_SND_VQ_CONTROL] += 1;
cmd = g_new0(virtio_snd_ctrl_command, 1);
cmd->elem = elem;
cmd->vq = vq;
@@ -946,6 +970,7 @@ static void virtio_snd_handle_tx_xfer(VirtIODevice *vdev,
VirtQueue *vq)
goto tx_err;
}
+ s->queue_inuse[VIRTIO_SND_VQ_TX] += 1;
size = iov_size(elem->out_sg, elem->out_num) - msg_sz;
buffer = g_malloc0(sizeof(VirtIOSoundPCMBuffer) + size);
@@ -1019,6 +1044,8 @@ static void virtio_snd_handle_rx_xfer(VirtIODevice *vdev,
VirtQueue *vq)
if (stream->info.direction != VIRTIO_SND_D_INPUT) {
goto rx_err;
}
+
+ s->queue_inuse[VIRTIO_SND_VQ_RX] += 1;
size = iov_size(elem->in_sg, elem->in_num) -
sizeof(virtio_snd_pcm_status);
buffer = g_malloc0(sizeof(VirtIOSoundPCMBuffer) + size);
@@ -1154,6 +1181,7 @@ static inline void return_tx_buffer(VirtIOSoundPCMStream
*stream,
virtqueue_push(buffer->vq,
buffer->elem,
sizeof(virtio_snd_pcm_status));
+ stream->s->queue_inuse[VIRTIO_SND_VQ_TX] -= 1;
virtio_notify(VIRTIO_DEVICE(stream->s), buffer->vq);
QSIMPLEQ_REMOVE(&stream->queue,
buffer,
@@ -1245,6 +1273,7 @@ static inline void return_rx_buffer(VirtIOSoundPCMStream
*stream,
virtqueue_push(buffer->vq,
buffer->elem,
sizeof(virtio_snd_pcm_status) + buffer->size);
+ stream->s->queue_inuse[VIRTIO_SND_VQ_RX] -= 1;
virtio_notify(VIRTIO_DEVICE(stream->s), buffer->vq);
QSIMPLEQ_REMOVE(&stream->queue,
buffer,
@@ -1350,6 +1379,40 @@ static void virtio_snd_unrealize(DeviceState *dev)
virtio_cleanup(vdev);
}
+static int virtio_snd_post_load(VirtIODevice *vdev)
+{
+ VirtIOSound *s = VIRTIO_SND(vdev);
+ uint32_t i;
+
+ for (i = 0; i < s->snd_conf.streams; i++) {
+ struct VirtIOSoundPCMStream *stream;
+
+ stream = virtio_snd_pcm_get_stream(s, i);
+ if (stream->state & VSND_PCMSTREAM_STATE_F_PREPARED) {
+ virtio_snd_pcm_open(stream);
+
+ if (stream->state & VSND_PCMSTREAM_STATE_F_ACTIVE) {
+ virtio_snd_pcm_set_active(stream, true);
+ }
+ }
+ }
+
+ for (i = 0; i < VIRTIO_SND_VQ_MAX; i++) {
+ if (s->queue_inuse[i]) {
+ bool rc;
+
+ rc = virtqueue_rewind(s->queues[i], s->queue_inuse[i]);
+ if (!rc) {
+ error_report(
+ "virtio-sound: could not rewind %u elements in queue %u",
+ s->queue_inuse[i], i);
+ }
+ s->queue_inuse[i] = 0;
+ }
+ }
+
+ return 0;
+}
static void virtio_snd_reset(VirtIODevice *vdev)
{
@@ -1375,6 +1438,10 @@ static void virtio_snd_reset(VirtIODevice *vdev)
virtio_snd_pcm_buffer_free(buffer);
}
}
+
+ for (i = 0; i < VIRTIO_SND_VQ_MAX; i++) {
+ s->queue_inuse[i] = 0;
+ }
}
static void virtio_snd_class_init(ObjectClass *klass, void *data)
@@ -1388,6 +1455,7 @@ static void virtio_snd_class_init(ObjectClass *klass,
void *data)
dc->vmsd = &vmstate_virtio_snd;
vdc->vmsd = &vmstate_virtio_snd_device;
+ vdc->post_load = virtio_snd_post_load;
vdc->realize = virtio_snd_realize;
vdc->unrealize = virtio_snd_unrealize;
vdc->get_config = virtio_snd_get_config;
diff --git a/include/hw/audio/virtio-snd.h b/include/hw/audio/virtio-snd.h
index 65afa6c184..457d18d196 100644
--- a/include/hw/audio/virtio-snd.h
+++ b/include/hw/audio/virtio-snd.h
@@ -196,6 +196,7 @@ struct VirtIOSound {
VirtIODevice parent_obj;
VirtQueue *queues[VIRTIO_SND_VQ_MAX];
+ uint32_t queue_inuse[VIRTIO_SND_VQ_MAX];
uint64_t features;
VirtIOSoundPCMStream *streams;
QEMUSoundCard card;
--
2.35.3
