On Wed, Mar 18, 2015 at 02:49:28PM +0800, Fam Zheng wrote:
> +static coroutine_fn int null_co_common(BlockDriverState *bs)
> +{
> + BDRVNullState *s = bs->opaque;
> +
> + /* Only emulate latency after vcpu is running. */
> + if (s->latency_ns && qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) > 0) {This seems a little hacky. There is runstate_is_running(), which doesn't depend on the CPU clock offset being 0 in qemu_clock_get_us().
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