linux-kernel - Re: [PATCH v11 08/16] KVM: x86: Introduce get_untagged_addr() in kvm_x86

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Date:   Mon, 23 Oct 2023 16:14:25 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Binbin Wu <binbin.wu@...ux.intel.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, chao.gao@...el.com, kai.huang@...el.com,
        David.Laight@...lab.com, robert.hu@...ux.intel.com,
        guang.zeng@...el.com
Subject: Re: [PATCH v11 08/16] KVM: x86: Introduce get_untagged_addr() in
 kvm_x86_ops and call it in emulator

On Wed, Sep 13, 2023, Binbin Wu wrote:
> diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
> index e3054e3e46d5..179931b73876 100644
> --- a/arch/x86/include/asm/kvm-x86-ops.h
> +++ b/arch/x86/include/asm/kvm-x86-ops.h
> @@ -134,6 +134,7 @@ 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(get_untagged_addr)

This needs to be KVM_X86_OP_OPTIONAL(), otherwise kvm_ops_update() will complain
about SVM not implementing the hook.  Hooray for useful warns! (I missed this in
review).