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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>
This commit is contained in:
Pankaj Gupta 2015-07-15 17:46:47 +05:30 committed by Amit Shah
parent 5b5e8cdd7d
commit 621a20e081
2 changed files with 9 additions and 7 deletions
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15
hw/virtio/virtio-rng.c
View File

@ -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);
}

1
include/hw/virtio/virtio-rng.h
View File

@ -44,6 +44,7 @@ typedef struct VirtIORNG {
*/
QEMUTimer *rate_limit_timer;
int64_t quota_remaining;
bool activate_timer;
} VirtIORNG;
#endif