linux-kernel - Re: [PATCH v4 3/6] KVM: x86: Move "emulate hypercall" function declarations to x86.h

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Message-ID: <04679c7d-cffb-5e5f-ac7a-d351f2e37c55@amd.com>
Date: Mon, 2 Dec 2024 14:05:03 -0600
From: Tom Lendacky <thomas.lendacky@....com>
To: Sean Christopherson <seanjc@...gle.com>,
 Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 Binbin Wu <binbin.wu@...ux.intel.com>,
 Isaku Yamahata <isaku.yamahata@...el.com>, Kai Huang <kai.huang@...el.com>,
 Xiaoyao Li <xiaoyao.li@...el.com>
Subject: Re: [PATCH v4 3/6] KVM: x86: Move "emulate hypercall" function
 declarations to x86.h

On 11/27/24 18:43, Sean Christopherson wrote:
> Move the declarations for the hypercall emulation APIs to x86.h.  While
> the helpers are exported, they are intended to be consumed only KVM vendor

s/only/only by/

> modules, i.e. don't need to exposed to the kernel at-large.
> 
> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Tom Lendacky <thomas.lendacky@....com>

> ---
>  arch/x86/include/asm/kvm_host.h | 6 ------
>  arch/x86/kvm/x86.h              | 6 ++++++
>  2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index e159e44a6a1b..c1251b371421 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -2181,12 +2181,6 @@ static inline void kvm_clear_apicv_inhibit(struct kvm *kvm,
>  	kvm_set_or_clear_apicv_inhibit(kvm, reason, false);
>  }
>  
> -unsigned long __kvm_emulate_hypercall(struct kvm_vcpu *vcpu, unsigned long nr,
> -				      unsigned long a0, unsigned long a1,
> -				      unsigned long a2, unsigned long a3,
> -				      int op_64_bit, int cpl);
> -int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
> -
>  int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
>  		       void *insn, int insn_len);
>  void kvm_mmu_print_sptes(struct kvm_vcpu *vcpu, gpa_t gpa, const char *msg);
> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index 45dd53284dbd..6db13b696468 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -617,4 +617,10 @@ static inline bool user_exit_on_hypercall(struct kvm *kvm, unsigned long hc_nr)
>  	return kvm->arch.hypercall_exit_enabled & BIT(hc_nr);
>  }
>  
> +unsigned long __kvm_emulate_hypercall(struct kvm_vcpu *vcpu, unsigned long nr,
> +				      unsigned long a0, unsigned long a1,
> +				      unsigned long a2, unsigned long a3,
> +				      int op_64_bit, int cpl);
> +int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
> +
>  #endif