diff options
| -rw-r--r-- | hw/virtio/trace-events | 3 | ||||
| -rw-r--r-- | hw/virtio/virtio-rng.c | 29 | ||||
| -rw-r--r-- | include/hw/virtio/virtio-rng.h | 2 |
3 files changed, 28 insertions, 6 deletions
diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 6926eed..1f7a7c1 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -11,8 +11,11 @@ virtio_set_status(void *vdev, uint8_t val) "vdev %p val %u" # hw/virtio/virtio-rng.c virtio_rng_guest_not_ready(void *rng) "rng %p: guest not ready" +virtio_rng_cpu_is_stopped(void *rng, int size) "rng %p: cpu is stopped, dropping %d bytes" +virtio_rng_popped(void *rng) "rng %p: elem popped" virtio_rng_pushed(void *rng, size_t len) "rng %p: %zd bytes pushed" virtio_rng_request(void *rng, size_t size, unsigned quota) "rng %p: %zd bytes requested, %u bytes quota left" +virtio_rng_vm_state_change(void *rng, int running, int state) "rng %p: state change to running %d state %d" # hw/virtio/virtio-balloon.c # diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c index 9639f4e..a6ee501 100644 --- a/hw/virtio/virtio-rng.c +++ b/hw/virtio/virtio-rng.c @@ -53,6 +53,15 @@ static void chr_read(void *opaque, const void *buf, size_t size) return; } + /* we can't modify the virtqueue until + * our state is fully synced + */ + + if (!runstate_check(RUN_STATE_RUNNING)) { + trace_virtio_rng_cpu_is_stopped(vrng, size); + return; + } + vrng->quota_remaining -= size; offset = 0; @@ -61,6 +70,7 @@ static void chr_read(void *opaque, const void *buf, size_t size) if (!elem) { break; } + trace_virtio_rng_popped(vrng); len = iov_from_buf(elem->in_sg, elem->in_num, 0, buf + offset, size - offset); offset += len; @@ -120,17 +130,21 @@ static uint64_t get_features(VirtIODevice *vdev, uint64_t f, Error **errp) return f; } -static int virtio_rng_post_load(void *opaque, int version_id) +static void virtio_rng_vm_state_change(void *opaque, int running, + RunState state) { VirtIORNG *vrng = opaque; + trace_virtio_rng_vm_state_change(vrng, running, state); + /* We may have an element ready but couldn't process it due to a quota - * limit. Make sure to try again after live migration when the quota may - * have been reset. + * limit or because CPU was stopped. Make sure to try again when the + * CPU restart. */ - virtio_rng_process(vrng); - return 0; + if (running && is_guest_ready(vrng)) { + virtio_rng_process(vrng); + } } static void check_rate_limit(void *opaque) @@ -198,6 +212,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp) vrng->rate_limit_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, check_rate_limit, vrng); vrng->activate_timer = true; + + vrng->vmstate = qemu_add_vm_change_state_handler(virtio_rng_vm_state_change, + vrng); } static void virtio_rng_device_unrealize(DeviceState *dev, Error **errp) @@ -205,6 +222,7 @@ static void virtio_rng_device_unrealize(DeviceState *dev, Error **errp) VirtIODevice *vdev = VIRTIO_DEVICE(dev); VirtIORNG *vrng = VIRTIO_RNG(dev); + qemu_del_vm_change_state_handler(vrng->vmstate); timer_del(vrng->rate_limit_timer); timer_free(vrng->rate_limit_timer); virtio_cleanup(vdev); @@ -218,7 +236,6 @@ static const VMStateDescription vmstate_virtio_rng = { VMSTATE_VIRTIO_DEVICE, VMSTATE_END_OF_LIST() }, - .post_load = virtio_rng_post_load, }; static Property virtio_rng_properties[] = { diff --git a/include/hw/virtio/virtio-rng.h b/include/hw/virtio/virtio-rng.h index 2d40abd..922dce7 100644 --- a/include/hw/virtio/virtio-rng.h +++ b/include/hw/virtio/virtio-rng.h @@ -45,6 +45,8 @@ typedef struct VirtIORNG { QEMUTimer *rate_limit_timer; int64_t quota_remaining; bool activate_timer; + + VMChangeStateEntry *vmstate; } VirtIORNG; #endif |