linux-kernel - Re: [PATCH 12/13] KVM: x86: de-underscorify __emulator_pio

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Message-ID: <6d0bdaf585e97517c28a6c20a38ab4eb32fa3d4d.camel@redhat.com>
Date:   Tue, 26 Oct 2021 16:56:52 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     seanjc@...gle.com
Subject: Re: [PATCH 12/13] KVM: x86: de-underscorify __emulator_pio_in

On Fri, 2021-10-22 at 11:36 -0400, Paolo Bonzini wrote:
> Now all callers except emulator_pio_in_emulated are using
> __emulator_pio_in/complete_emulator_pio_in explicitly.
> Move the "either copy the result or attempt PIO" logic in
> emulator_pio_in_emulated, and rename __emulator_pio_in to
> just emulator_pio_in.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/x86.c | 22 ++++++++--------------
>  1 file changed, 8 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 42826087afd9..c3a2f479604d 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6927,7 +6927,7 @@ static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
>  	return 0;
>  }
>  
> -static int __emulator_pio_in(struct kvm_vcpu *vcpu, int size,
> +static int emulator_pio_in(struct kvm_vcpu *vcpu, int size,
>  			     unsigned short port, void *val, unsigned int count)
>  {
>  	int r = emulator_pio_in_out(vcpu, size, port, val, count, true);
> @@ -6946,27 +6946,21 @@ static void complete_emulator_pio_in(struct kvm_vcpu *vcpu, void *val)
>  	vcpu->arch.pio.count = 0;
>  }
>  
> -static int emulator_pio_in(struct kvm_vcpu *vcpu, int size,
> -			   unsigned short port, void *val, unsigned int count)
> +static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
> +				    int size, unsigned short port, void *val,
> +				    unsigned int count)
>  {
> +	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
>  	if (vcpu->arch.pio.count) {
>  		/* Complete previous iteration.  */
>  		WARN_ON(count != vcpu->arch.pio.count);
>  		complete_emulator_pio_in(vcpu, val);
>  		return 1;
>  	} else {
> -		return __emulator_pio_in(vcpu, size, port, val, count);
> +		return emulator_pio_in(vcpu, size, port, val, count);
>  	}
>  }
>  
> -static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
> -				    int size, unsigned short port, void *val,
> -				    unsigned int count)
> -{
> -	return emulator_pio_in(emul_to_vcpu(ctxt), size, port, val, count);
> -
> -}
> -
>  static int emulator_pio_out(struct kvm_vcpu *vcpu, int size,
>  			    unsigned short port, const void *val,
>  			    unsigned int count)
> @@ -8076,7 +8070,7 @@ static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size,
>  	/* For size less than 4 we merge, else we zero extend */
>  	val = (size < 4) ? kvm_rax_read(vcpu) : 0;
>  
> -	ret = __emulator_pio_in(vcpu, size, port, &val, 1);
> +	ret = emulator_pio_in(vcpu, size, port, &val, 1);
>  	if (ret) {
>  		kvm_rax_write(vcpu, val);
>  		return ret;
> @@ -12436,7 +12430,7 @@ static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
>  	for (;;) {
>  		unsigned int count =
>  			min_t(unsigned int, PAGE_SIZE / size, vcpu->arch.sev_pio_count);
> -		if (!__emulator_pio_in(vcpu, size, port, vcpu->arch.sev_pio_data, count))
> +		if (!emulator_pio_in(vcpu, size, port, vcpu->arch.sev_pio_data, count))
>  			break;
>  
>  		/* Emulation done by the kernel.  */
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky