linux-kernel - Re: [PATCH v5 03/30] KVM: x86: Move check_processor_compatibility from init ops to runtime ops

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Message-ID: <Y0XJvx7aISd+fZDq@google.com>
Date:   Tue, 11 Oct 2022 19:53:35 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     isaku.yamahata@...el.com
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        isaku.yamahata@...il.com, Kai Huang <kai.huang@...el.com>,
        Chao Gao <chao.gao@...el.com>,
        Atish Patra <atishp@...shpatra.org>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Huang Ying <ying.huang@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>, Yuan Yao <yuan.yao@...el.com>
Subject: Re: [PATCH v5 03/30] KVM: x86: Move check_processor_compatibility
 from init ops to runtime ops

On Thu, Sep 22, 2022, isaku.yamahata@...el.com wrote:
> From: Chao Gao <chao.gao@...el.com>
> 
> so that KVM can do compatibility checks on hotplugged CPUs. Drop __init
> from check_processor_compatibility() and its callees.
> 
> use a static_call() to invoke .check_processor_compatibility.
> 
> Opportunistically rename {svm,vmx}_check_processor_compat to conform
> to the naming convention of fields of kvm_x86_ops.
> 
> Signed-off-by: Chao Gao <chao.gao@...el.com>
> Reviewed-by: Sean Christopherson <seanjc@...gle.com>
> Link: https://lore.kernel.org/r/20220216031528.92558-2-chao.gao@intel.com
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> Reviewed-by: Yuan Yao <yuan.yao@...el.com>
> ---
>  arch/x86/include/asm/kvm-x86-ops.h |  1 +
>  arch/x86/include/asm/kvm_host.h    |  2 +-
>  arch/x86/kvm/svm/svm.c             |  4 ++--
>  arch/x86/kvm/vmx/vmx.c             | 14 +++++++-------
>  arch/x86/kvm/x86.c                 |  3 +--
>  5 files changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
> index 51f777071584..3bc45932e2d1 100644
> --- a/arch/x86/include/asm/kvm-x86-ops.h
> +++ b/arch/x86/include/asm/kvm-x86-ops.h
> @@ -129,6 +129,7 @@ KVM_X86_OP(msr_filter_changed)
>  KVM_X86_OP(complete_emulated_msr)
>  KVM_X86_OP(vcpu_deliver_sipi_vector)
>  KVM_X86_OP_OPTIONAL_RET0(vcpu_get_apicv_inhibit_reasons);
> +KVM_X86_OP(check_processor_compatibility)

Nit I missed in all previous versions: please add this new entry above "hardware_enable"
so as to keep the order similar to the order in struct kvm_x86_ops.  E.g.

KVM_X86_OP(check_processor_compatibility)
KVM_X86_OP(hardware_enable)
...