linux-kernel - Re: [PATCH v2 1/8] KVM: x86: start moving SMM-related functions to new files

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Date:   Fri, 14 Oct 2022 19:38:58 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        maciej.szmigiero@...cle.com
Subject: Re: [PATCH v2 1/8] KVM: x86: start moving SMM-related functions to
 new files

On Thu, Sep 29, 2022, Paolo Bonzini wrote:
> diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
> index a5ac4a5a5179..cb7e68c93e1a 100644
> --- a/arch/x86/kvm/lapic.h
> +++ b/arch/x86/kvm/lapic.h
> @@ -7,7 +7,6 @@
>  #include <linux/kvm_host.h>
>  
>  #include "hyperv.h"
> -#include "kvm_cache_regs.h"
>  
>  #define KVM_APIC_INIT		0
>  #define KVM_APIC_SIPI		1
> @@ -229,11 +228,7 @@ static inline bool kvm_apic_has_pending_init_or_sipi(struct kvm_vcpu *vcpu)
>  	return lapic_in_kernel(vcpu) && vcpu->arch.apic->pending_events;
>  }
>  
> -static inline bool kvm_apic_init_sipi_allowed(struct kvm_vcpu *vcpu)
> -{
> -	return !is_smm(vcpu) &&
> -	       !static_call(kvm_x86_apic_init_signal_blocked)(vcpu);
> -}
> +bool kvm_apic_init_sipi_allowed(struct kvm_vcpu *vcpu);

I don't see any reason to force this to go in lapic.c, just include smm.h in
lapic.h, it's not an unreasonable dependency.  That way this ends up being a
direct call when SMM is compiled out.

> diff --git a/arch/x86/kvm/smm.h b/arch/x86/kvm/smm.h
> new file mode 100644
> index 000000000000..d85d4ccd32dd
> --- /dev/null
> +++ b/arch/x86/kvm/smm.h
> @@ -0,0 +1,25 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef ASM_KVM_SMM_H
> +#define ASM_KVM_SMM_H

#include <linux/kvm_host.h>

For HF_SMM_MASK, KVM_REQ_SMI, struct kvm_vcpu, etc...  Relying on the caller to
include that might bite someone in the futrure.