Re: [PATCH v9 3/3] cpus-common: implement dirty page limit on vCPU

[Peter Xu <peterx@redhat.com>]

On Fri, Dec 03, 2021 at 09:39:47AM +0800, huangy81@chinatelecom.cn wrote:
> +void dirtylimit_setup(int max_cpus)
> +{
> +    if (!kvm_enabled() || !kvm_dirty_ring_enabled()) {
> +        return;
> +    }
> +
> +    dirtylimit_calc_state_init(max_cpus);
> +    dirtylimit_state_init(max_cpus);
> +}

[...]

> diff --git a/softmmu/vl.c b/softmmu/vl.c
> index 620a1f1..0f83ce3 100644
> --- a/softmmu/vl.c
> +++ b/softmmu/vl.c
> @@ -3777,5 +3777,6 @@ void qemu_init(int argc, char **argv, char **envp)
>      qemu_init_displays();
>      accel_setup_post(current_machine);
>      os_setup_post();
> +    dirtylimit_setup(current_machine->smp.max_cpus);
>      resume_mux_open();

Can we do the init only when someone enables it?  We could also do proper
free() for the structs when it's globally turned off.

-- 
Peter Xu