diff options
| author | Pankaj Gupta <pagupta@redhat.com> | 2015-07-15 17:46:47 +0530 |
|---|---|---|
| committer | Amit Shah <amit.shah@redhat.com> | 2015-07-17 19:05:16 +0530 |
| commit | 621a20e08155179b1902c428361e80f41429f50d (patch) | |
| tree | c9871f619742c9ec55f9ed6ab68a2b05ca2cc772 /hw/virtio/virtio-rng.c | |
| parent | 5b5e8cdd7da7a2214dd062afff5b866234aab228 (diff) | |
virtio-rng: trigger timer only when guest requests for entropy
This patch triggers timer only when guest requests for
entropy. As soon as first request from guest for entropy
comes we set the timer. Timer bumps up the quota value
when it gets triggered.
Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1436962608-9961-2-git-send-email-pagupta@redhat.com>
[Re-worded patch subject, removed extra whitespace -- Amit]
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Diffstat (limited to 'hw/virtio/virtio-rng.c')
| -rw-r--r-- | hw/virtio/virtio-rng.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/hw/virtio/virtio-rng.c b/hw/virtio/virtio-rng.c index 740ed3102b..6e5f022301 100644 --- a/hw/virtio/virtio-rng.c +++ b/hw/virtio/virtio-rng.c @@ -77,6 +77,12 @@ static void virtio_rng_process(VirtIORNG *vrng) return; } + if (vrng->activate_timer) { + timer_mod(vrng->rate_limit_timer, + qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vrng->conf.period_ms); + vrng->activate_timer = false; + } + if (vrng->quota_remaining < 0) { quota = 0; } else { @@ -138,8 +144,7 @@ static void check_rate_limit(void *opaque) vrng->quota_remaining = vrng->conf.max_bytes; virtio_rng_process(vrng); - timer_mod(vrng->rate_limit_timer, - qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vrng->conf.period_ms); + vrng->activate_timer = true; } static void virtio_rng_device_realize(DeviceState *dev, Error **errp) @@ -195,13 +200,9 @@ static void virtio_rng_device_realize(DeviceState *dev, Error **errp) vrng->vq = virtio_add_queue(vdev, 8, handle_input); vrng->quota_remaining = vrng->conf.max_bytes; - vrng->rate_limit_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, check_rate_limit, vrng); - - timer_mod(vrng->rate_limit_timer, - qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vrng->conf.period_ms); - + vrng->activate_timer = true; register_savevm(dev, "virtio-rng", -1, 1, virtio_rng_save, virtio_rng_load, vrng); } |