On 29/04/20 11:36, Vitaly Kuznetsov wrote:
> +
> + if (__this_cpu_read(apf_reason.enabled)) {
> + reason = __this_cpu_read(apf_reason.reason);
> + if (reason == KVM_PV_REASON_PAGE_READY) {
> + token = __this_cpu_read(apf_reason.token);
> + /*
> + * Make sure we read 'token' before we reset
> + * 'reason' or it can get lost.
> + */
> + mb();
> + __this_cpu_write(apf_reason.reason, 0);
> + kvm_async_pf_task_wake(token);
> + }
If tokens cannot be zero, could we avoid using reason for the page ready
interrupt (and ultimately retire "reason" completely)?
Paolo
