static void reset_device(struct device *dev)
{
struct virtqueue *vq;
verbose("Resetting device %s\n", dev->name);
/* Clear any features they've acked. */
memset(get_feature_bits(dev) + dev->feature_len, 0, dev->feature_len);
/* We're going to be explicitly killing threads, so ignore them. */
signal(SIGCHLD, SIG_IGN);
/* Zero out the virtqueues, get rid of their threads */
for (vq = dev->vq; vq; vq = vq->next) {
if (vq->thread != (pid_t)-1) {
kill(vq->thread, SIGTERM);
waitpid(vq->thread, NULL, 0);
vq->thread = (pid_t)-1;
}
memset(vq->vring.desc, 0,
vring_size(vq->config.num, LGUEST_VRING_ALIGN));
lg_last_avail(vq) = 0;
}
dev->running = false;
/* Now we care if threads die. */
signal(SIGCHLD, (void *)kill_launcher);
}
static void reset_device(struct device *dev)
{
struct virtqueue *vq;
verbose("Resetting device %s\n", dev->name);
memset(get_feature_bits(dev) + dev->feature_len, 0, dev->feature_len);
signal(SIGCHLD, SIG_IGN);
for (vq = dev->vq; vq; vq = vq->next) {
if (vq->thread != (pid_t)-1) {
kill(vq->thread, SIGTERM);
waitpid(vq->thread, NULL, 0);
vq->thread = (pid_t)-1;
}
memset(vq->vring.desc, 0,
vring_size(vq->config.num, LGUEST_VRING_ALIGN));
lg_last_avail(vq) = 0;
}
dev->running = false;
signal(SIGCHLD, (void *)kill_launcher);
}
static void start_device(struct device *dev)
{
unsigned int i;
struct virtqueue *vq;
verbose("Device %s OK: offered", dev->name);
for (i = 0; i < dev->feature_len; i++)
verbose(" %02x", get_feature_bits(dev)[i]);
verbose(", accepted");
for (i = 0; i < dev->feature_len; i++)
verbose(" %02x", get_feature_bits(dev)
[dev->feature_len+i]);
for (vq = dev->vq; vq; vq = vq->next) {
if (vq->service)
create_thread(vq);
}
dev->running = true;
}
static void add_feature(struct device *dev, unsigned bit)
{
u8 *features = get_feature_bits(dev);
if (dev->desc->feature_len <= bit / CHAR_BIT) {
assert(dev->desc->config_len == 0);
dev->feature_len = dev->desc->feature_len = (bit/CHAR_BIT) + 1;
}
features[bit / CHAR_BIT] |= (1 << (bit % CHAR_BIT));
}
/*
* The first half of the feature bitmask is for us to advertise features. The
* second half is for the Guest to accept features.
*/
static void add_feature(struct device *dev, unsigned bit)
{
u8 *features = get_feature_bits(dev);
/* We can't extend the feature bits once we've added config bytes */
if (dev->desc->feature_len <= bit / CHAR_BIT) {
assert(dev->desc->config_len == 0);
dev->feature_len = dev->desc->feature_len = (bit/CHAR_BIT) + 1;
}
features[bit / CHAR_BIT] |= (1 << (bit % CHAR_BIT));
}
