linux-kernel - Re: [RFC 3/3] x86: KVM: stats: Add a stat counter for GALog events

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Date: Tue, 9 Apr 2024 14:45:06 +0800
From: Chao Gao <chao.gao@...el.com>
To: Alejandro Jimenez <alejandro.j.jimenez@...cle.com>
CC: <kvm@...r.kernel.org>, <seanjc@...gle.com>, <pbonzini@...hat.com>,
	<linux-kernel@...r.kernel.org>, <joao.m.martins@...cle.com>,
	<boris.ostrovsky@...cle.com>, <mark.kanda@...cle.com>,
	<suravee.suthikulpanit@....com>, <mlevitsk@...hat.com>
Subject: Re: [RFC 3/3] x86: KVM: stats: Add a stat counter for GALog events

>diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
>index 4b74ea91f4e6..853cafe4a9af 100644
>--- a/arch/x86/kvm/svm/avic.c
>+++ b/arch/x86/kvm/svm/avic.c
>@@ -165,8 +165,10 @@ int avic_ga_log_notifier(u32 ga_tag)
> 	 * bit in the vAPIC backing page. So, we just need to schedule
> 	 * in the vcpu.
> 	 */
>-	if (vcpu)
>+	if (vcpu) {
> 		kvm_vcpu_wake_up(vcpu);
>+		++vcpu->stat.ga_log_event;
>+	}
> 

I am not sure why this is added for SVM only. it looks to me GALog events are
similar to Intel IOMMU's wakeup events. Can we have a general name? maybe
iommu_wakeup_event

and increase the counter after the kvm_vcpu_wake_up() call in pi_wakeup_handler().