diff options
Diffstat (limited to 'hw/char/virtio-serial-bus.c')
| -rw-r--r-- | hw/char/virtio-serial-bus.c | 78 |
1 files changed, 47 insertions, 31 deletions
diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c index 8d5c740558..99cb6836ad 100644 --- a/hw/char/virtio-serial-bus.c +++ b/hw/char/virtio-serial-bus.c @@ -83,7 +83,7 @@ static bool use_multiport(VirtIOSerial *vser) static size_t write_to_port(VirtIOSerialPort *port, const uint8_t *buf, size_t size) { - VirtQueueElement elem; + VirtQueueElement *elem; VirtQueue *vq; size_t offset; @@ -96,15 +96,17 @@ static size_t write_to_port(VirtIOSerialPort *port, while (offset < size) { size_t len; - if (!virtqueue_pop(vq, &elem)) { + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + if (!elem) { break; } - len = iov_from_buf(elem.in_sg, elem.in_num, 0, + len = iov_from_buf(elem->in_sg, elem->in_num, 0, buf + offset, size - offset); offset += len; - virtqueue_push(vq, &elem, len); + virtqueue_push(vq, elem, len); + g_free(elem); } virtio_notify(VIRTIO_DEVICE(port->vser), vq); @@ -113,13 +115,18 @@ static size_t write_to_port(VirtIOSerialPort *port, static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev) { - VirtQueueElement elem; + VirtQueueElement *elem; if (!virtio_queue_ready(vq)) { return; } - while (virtqueue_pop(vq, &elem)) { - virtqueue_push(vq, &elem, 0); + for (;;) { + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + if (!elem) { + break; + } + virtqueue_push(vq, elem, 0); + g_free(elem); } virtio_notify(vdev, vq); } @@ -138,21 +145,22 @@ static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, unsigned int i; /* Pop an elem only if we haven't left off a previous one mid-way */ - if (!port->elem.out_num) { - if (!virtqueue_pop(vq, &port->elem)) { + if (!port->elem) { + port->elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + if (!port->elem) { break; } port->iov_idx = 0; port->iov_offset = 0; } - for (i = port->iov_idx; i < port->elem.out_num; i++) { + for (i = port->iov_idx; i < port->elem->out_num; i++) { size_t buf_size; ssize_t ret; - buf_size = port->elem.out_sg[i].iov_len - port->iov_offset; + buf_size = port->elem->out_sg[i].iov_len - port->iov_offset; ret = vsc->have_data(port, - port->elem.out_sg[i].iov_base + port->elem->out_sg[i].iov_base + port->iov_offset, buf_size); if (port->throttled) { @@ -167,8 +175,9 @@ static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, if (port->throttled) { break; } - virtqueue_push(vq, &port->elem, 0); - port->elem.out_num = 0; + virtqueue_push(vq, port->elem, 0); + g_free(port->elem); + port->elem = NULL; } virtio_notify(vdev, vq); } @@ -185,22 +194,26 @@ static void flush_queued_data(VirtIOSerialPort *port) static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len) { - VirtQueueElement elem; + VirtQueueElement *elem; VirtQueue *vq; vq = vser->c_ivq; if (!virtio_queue_ready(vq)) { return 0; } - if (!virtqueue_pop(vq, &elem)) { + + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + if (!elem) { return 0; } /* TODO: detect a buffer that's too short, set NEEDS_RESET */ - iov_from_buf(elem.in_sg, elem.in_num, 0, buf, len); + iov_from_buf(elem->in_sg, elem->in_num, 0, buf, len); - virtqueue_push(vq, &elem, len); + virtqueue_push(vq, elem, len); virtio_notify(VIRTIO_DEVICE(vser), vq); + g_free(elem); + return len; } @@ -414,7 +427,7 @@ static void control_in(VirtIODevice *vdev, VirtQueue *vq) static void control_out(VirtIODevice *vdev, VirtQueue *vq) { - VirtQueueElement elem; + VirtQueueElement *elem; VirtIOSerial *vser; uint8_t *buf; size_t len; @@ -423,10 +436,15 @@ static void control_out(VirtIODevice *vdev, VirtQueue *vq) len = 0; buf = NULL; - while (virtqueue_pop(vq, &elem)) { + for (;;) { size_t cur_len; - cur_len = iov_size(elem.out_sg, elem.out_num); + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + if (!elem) { + break; + } + + cur_len = iov_size(elem->out_sg, elem->out_num); /* * Allocate a new buf only if we didn't have one previously or * if the size of the buf differs @@ -437,10 +455,11 @@ static void control_out(VirtIODevice *vdev, VirtQueue *vq) buf = g_malloc(cur_len); len = cur_len; } - iov_to_buf(elem.out_sg, elem.out_num, 0, buf, cur_len); + iov_to_buf(elem->out_sg, elem->out_num, 0, buf, cur_len); handle_control_message(vser, buf, cur_len); - virtqueue_push(vq, &elem, 0); + virtqueue_push(vq, elem, 0); + g_free(elem); } g_free(buf); virtio_notify(vdev, vq); @@ -620,16 +639,14 @@ static void virtio_serial_save_device(VirtIODevice *vdev, QEMUFile *f) qemu_put_byte(f, port->host_connected); elem_popped = 0; - if (port->elem.out_num) { + if (port->elem) { elem_popped = 1; } qemu_put_be32s(f, &elem_popped); if (elem_popped) { qemu_put_be32s(f, &port->iov_idx); qemu_put_be64s(f, &port->iov_offset); - - qemu_put_buffer(f, (unsigned char *)&port->elem, - sizeof(port->elem)); + qemu_put_virtqueue_element(f, port->elem); } } } @@ -704,9 +721,8 @@ static int fetch_active_ports_list(QEMUFile *f, int version_id, qemu_get_be32s(f, &port->iov_idx); qemu_get_be64s(f, &port->iov_offset); - qemu_get_buffer(f, (unsigned char *)&port->elem, - sizeof(port->elem)); - virtqueue_map(&port->elem); + port->elem = + qemu_get_virtqueue_element(f, sizeof(VirtQueueElement)); /* * Port was throttled on source machine. Let's @@ -928,7 +944,7 @@ static void virtser_port_device_realize(DeviceState *dev, Error **errp) return; } - port->elem.out_num = 0; + port->elem = NULL; } static void virtser_port_device_plug(HotplugHandler *hotplug_dev, |