linux-kernel - Re: [RFC PATCH 12/41] KVM: x86/pmu: Plumb through passthrough PMU to vcpu for Intel CPUs

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Message-ID: <ZhhOsvPxhEQl9YmX@google.com>
Date: Thu, 11 Apr 2024 13:57:22 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Xiong Zhang <xiong.y.zhang@...ux.intel.com>
Cc: pbonzini@...hat.com, peterz@...radead.org, mizhang@...gle.com, 
	kan.liang@...el.com, zhenyuw@...ux.intel.com, dapeng1.mi@...ux.intel.com, 
	jmattson@...gle.com, kvm@...r.kernel.org, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, zhiyuan.lv@...el.com, eranian@...gle.com, 
	irogers@...gle.com, samantha.alt@...el.com, like.xu.linux@...il.com, 
	chao.gao@...el.com, Xiong Zhang <xiong.y.zhang@...el.com>
Subject: Re: [RFC PATCH 12/41] KVM: x86/pmu: Plumb through passthrough PMU to
 vcpu for Intel CPUs

On Fri, Jan 26, 2024, Xiong Zhang wrote:
> From: Mingwei Zhang <mizhang@...gle.com>
> 
> Plumb through passthrough PMU setting from kvm->arch into kvm_pmu on each
> vcpu created. Note that enabling PMU is decided by VMM when it sets the
> CPUID bits exposed to guest VM. So plumb through the enabling for each pmu
> in intel_pmu_refresh().

As stated in the previous patch, even the most naive implementation can be:

static inline bool is_passthrough_pmu_enabled(struct kvm_vcpu *vcpu)
{
	return enable_passthrough_pmu && vcpu_to_pmu(vcpu)->version;
}