linux-kernel - Re: [PATCH 17/44] KVM: arm64: Do arm/arch initialiation without bouncing through kvm

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Date:   Thu, 3 Nov 2022 08:25:37 +0100
From:   Philippe Mathieu-Daudé <philmd@...aro.org>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Matthew Rosato <mjrosato@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Atish Patra <atishp@...shpatra.org>,
        David Hildenbrand <david@...hat.com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        kvmarm@...ts.cs.columbia.edu, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        Fabiano Rosas <farosas@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Chao Gao <chao.gao@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yuan Yao <yuan.yao@...el.com>
Subject: Re: [PATCH 17/44] KVM: arm64: Do arm/arch initialiation without
 bouncing through kvm_init()

Hi Sean,

On 3/11/22 00:18, Sean Christopherson wrote:
> Move arm/arch specific initialization directly in arm's module_init(),
> now called kvm_arm_init(), instead of bouncing through kvm_init() to
> reach kvm_arch_init().  Invoking kvm_arch_init() is the very first action
> performed by kvm_init(), i.e. this is a glorified nop.
> 
> Making kvm_arch_init() a nop will allow dropping it entirely once all
> other architectures follow suit.
> 
> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>   arch/arm64/kvm/arm.c | 25 ++++++++++++++++---------
>   1 file changed, 16 insertions(+), 9 deletions(-)

>   /* NOP: Compiling as a module not supported */
>   void kvm_arch_exit(void)
>   {
> -	kvm_unregister_perf_callbacks();

Doesn't this belong to the previous patch?

> +
>   }