linux-kernel - Re: [PATCH v13 23/25] virt: geniezone: Add support for guest VM CPU idle

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Message-ID: <20241217104535.167-1-hdanton@sina.com>
Date: Tue, 17 Dec 2024 18:45:34 +0800
From: Hillf Danton <hdanton@...a.com>
To: Liju-clr Chen <liju-clr.chen@...iatek.com>,
	Kevenny Hsieh <kevenny.hsieh@...iatek.com>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v13 23/25] virt: geniezone: Add support for guest VM CPU idle

On Thu, 14 Nov 2024 18:08:00 +0800
> +/**
> + * gzvm_vcpu_wakeup_all - wakes up all vCPUs associated with the specified
> + * gzvm.
> + * @gzvm: Pointer to gzvm structure.
> + */
> +void gzvm_vcpu_wakeup_all(struct gzvm *gzvm)
> +{
> +	for (int i = 0; i < GZVM_MAX_VCPUS; i++) {
> +		if (gzvm->vcpus[i]) {
> +			gzvm->vcpus[i]->idle_events.virtio_irq += 1;
> +			rcuwait_wake_up(&gzvm->vcpus[i]->wait);
> +		}
> +	}
> +}
> +
>  static enum hrtimer_restart gzvm_vtimer_expire(struct hrtimer *hrt)
>  {
> +	struct gzvm_vcpu *vcpu;
> +
> +	vcpu = container_of(hrt, struct gzvm_vcpu, gzvm_vtimer);
> +
> +	gzvm_vcpu_wakeup_all(vcpu->gzvm);
> +
Given vcpu, what sense could thunder herd make?

>  	return HRTIMER_NORESTART;
>  }