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From: Oliver Upton <oliver.upton@linux.dev>
To: Raghavendra Rao Ananta <rananta@google.com>
Cc: Marc Zyngier <maz@kernel.org>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Shaoqin Huang <shahuang@redhat.com>,
	Jing Zhang <jingzhangos@google.com>,
	Reiji Watanabe <reijiw@google.com>,
	Colton Lewis <coltonlewis@google.com>,
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v8 04/13] KVM: arm64: PMU: Set PMCR_EL0.N for vCPU based
 on the associated PMU
Message-ID: <ZTeM2RnMCRFoGsZd@linux.dev>
References: <20231020214053.2144305-1-rananta@google.com>
 <20231020214053.2144305-5-rananta@google.com>
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On Fri, Oct 20, 2023 at 09:40:44PM +0000, Raghavendra Rao Ananta wrote:

[...]

> +int kvm_arm_pmu_get_max_counters(struct kvm *kvm)
> +{
> +	struct arm_pmu *arm_pmu = kvm->arch.arm_pmu;
> +
> +	lockdep_assert_held(&kvm->arch.config_lock);

This lockdep assertion is misleading. Readers of kvm_arch::arm_pmu *are
not* serialized by the config_lock.

-- 
Thanks,
Oliver