linux-kernel - Re: [PATCH v2 1/2] s390/kvm: split kvm_s390_real_to

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Date:   Tue, 23 Mar 2021 16:01:54 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     frankja@...ux.ibm.com, david@...hat.com, cohuck@...hat.com,
        kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        stable@...r.kernel.org, Thomas Huth <thuth@...hat.com>
Subject: Re: [PATCH v2 1/2] s390/kvm: split kvm_s390_real_to_abs



On 22.03.21 15:05, Claudio Imbrenda wrote:
> A new function _kvm_s390_real_to_abs will apply prefixing to a real address
> with a given prefix value.
> 
> The old kvm_s390_real_to_abs becomes now a wrapper around the new function.
> 
> This is needed to avoid code duplication in vSIE.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> Reviewed-by: David Hildenbrand <david@...hat.com>
> Reviewed-by: Thomas Huth <thuth@...hat.com>

Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>

> ---
>   arch/s390/kvm/gaccess.h | 23 +++++++++++++++++------
>   1 file changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h
> index daba10f76936..7c72a5e3449f 100644
> --- a/arch/s390/kvm/gaccess.h
> +++ b/arch/s390/kvm/gaccess.h
> @@ -18,17 +18,14 @@
>   
>   /**
>    * kvm_s390_real_to_abs - convert guest real address to guest absolute address
> - * @vcpu - guest virtual cpu
> + * @prefix - guest prefix
>    * @gra - guest real address
>    *
>    * Returns the guest absolute address that corresponds to the passed guest real
> - * address @gra of a virtual guest cpu by applying its prefix.
> + * address @gra of by applying the given prefix.
>    */
> -static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu,
> -						 unsigned long gra)
> +static inline unsigned long _kvm_s390_real_to_abs(u32 prefix, unsigned long gra)
>   {
> -	unsigned long prefix  = kvm_s390_get_prefix(vcpu);
> -
>   	if (gra < 2 * PAGE_SIZE)
>   		gra += prefix;
>   	else if (gra >= prefix && gra < prefix + 2 * PAGE_SIZE)
> @@ -36,6 +33,20 @@ static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu,
>   	return gra;
>   }
>   
> +/**
> + * kvm_s390_real_to_abs - convert guest real address to guest absolute address
> + * @vcpu - guest virtual cpu
> + * @gra - guest real address
> + *
> + * Returns the guest absolute address that corresponds to the passed guest real
> + * address @gra of a virtual guest cpu by applying its prefix.
> + */
> +static inline unsigned long kvm_s390_real_to_abs(struct kvm_vcpu *vcpu,
> +						 unsigned long gra)
> +{
> +	return _kvm_s390_real_to_abs(kvm_s390_get_prefix(vcpu), gra);
> +}
> +
>   /**
>    * _kvm_s390_logical_to_effective - convert guest logical to effective address
>    * @psw: psw of the guest
>