Re: [Qemu-devel] [RFC v1 07/12] cpus: introduce async_safe_run_on_cpu.

[Sergey Fedorov]

On 15/04/16 17:23, Alex Bennée wrote:
> +/*
> + * Safe work interface
> + *
> + * Safe work is defined as work that requires the system to be
> + * quiescent before making changes.
> + */
> +
> +void async_safe_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data)
> +{
> +    CPUState *iter;
> +    qemu_safe_work_item wi;

We can call the function right away if MTTCG is disabled or there's only
one CPU emulated.

Kind regards,
Sergey

> +    wi.cpu = cpu;
> +    wi.func = func;
> +    wi.data = data;
> +
> +    qemu_mutex_lock(&safe_work_mutex);
> +    g_array_append_val(safe_work, wi);
> +    atomic_inc(&safe_work_pending);
> +    qemu_mutex_unlock(&safe_work_mutex);
> +
> +    /* Signal all vCPUs to halt */
> +    CPU_FOREACH(iter) {
> +        qemu_cpu_kick(iter);
> +    }
> +}