linux-kernel - Re: [PATCH v2 4/7] KVM: x86: Copy kvm_pmu_ops by value to eliminate layer of indirection

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Date:   Wed, 8 Dec 2021 18:10:25 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Like Xu <like.xu.linux@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] KVM: x86: Copy kvm_pmu_ops by value to eliminate
 layer of indirection

On Mon, Nov 08, 2021, Like Xu wrote:
> From: Like Xu <likexu@...cent.com>
> 
> Replace the kvm_pmu_ops pointer in common x86 with an instance of the
> struct to save one pointer dereference when invoking functions. Copy the
> struct by value to set the ops during kvm_init().
> 
> Signed-off-by: Like Xu <likexu@...cent.com>
> ---
>  arch/x86/kvm/pmu.c | 41 ++++++++++++++++++++++-------------------
>  arch/x86/kvm/pmu.h |  4 +++-
>  arch/x86/kvm/x86.c |  1 +
>  3 files changed, 26 insertions(+), 20 deletions(-)
> 
> diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
> index aa6ac9c7aff2..353989bf0102 100644
> --- a/arch/x86/kvm/pmu.c
> +++ b/arch/x86/kvm/pmu.c
> @@ -47,6 +47,9 @@
>   *        * AMD:   [0 .. AMD64_NUM_COUNTERS-1] <=> gp counters
>   */
>  
> +struct kvm_pmu_ops kvm_pmu_ops __read_mostly;
> +EXPORT_SYMBOL_GPL(kvm_pmu_ops);

This export isn't necessary.