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Subject: Re: [PATCH v2 03/15] s390: zcrypt: externalize AP instructions
 available function
To:     Tony Krowiak <akrowiak@linux.vnet.ibm.com>,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org
Cc:     freude@de.ibm.com, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
        cohuck@redhat.com, kwankhede@nvidia.com,
        bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com,
        alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com,
        alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com,
        jjherne@linux.vnet.ibm.com, thuth@redhat.com,
        pasic@linux.vnet.ibm.com, fiuczy@linux.vnet.ibm.com,
        buendgen@de.ibm.com
References: <1519741693-17440-1-git-send-email-akrowiak@linux.vnet.ibm.com>
 <1519741693-17440-4-git-send-email-akrowiak@linux.vnet.ibm.com>
From:   Harald Freudenberger <freude@linux.vnet.ibm.com>
Date:   Wed, 28 Feb 2018 12:40:04 +0100
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On 02/27/2018 03:28 PM, Tony Krowiak wrote:
> If the AP instructions are not available on the linux host, then
> AP devices can not be interpreted by the SIE. The AP bus has a
> function it uses to determine if the AP instructions are
> available. This patch provides a new function that wraps the
> AP bus's function to externalize it for use by KVM.
>
> Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
> ---
>  arch/s390/include/asm/ap.h   |    7 +++++++
>  drivers/s390/crypto/ap_bus.c |    6 ++++++
>  2 files changed, 13 insertions(+), 0 deletions(-)
>
> diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
> index cfce683..1df6b59 100644
> --- a/arch/s390/include/asm/ap.h
> +++ b/arch/s390/include/asm/ap.h
> @@ -120,4 +120,11 @@ struct ap_queue_status ap_queue_irq_ctrl(ap_qid_t qid,
>  					 struct ap_qirq_ctrl qirqctrl,
>  					 void *ind);
>
> +/**
> + * ap_instructions_installed() - Tests whether AP instructions are installed
> + *
> + * Returns 1 if the AP instructions are installed, otherwise; returns 0
> + */
> +int ap_instructions_installed(void);
> +
>  #endif /* _ASM_S390_AP_H_ */
> diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
> index 48d55dc..089b1cf 100644
> --- a/drivers/s390/crypto/ap_bus.c
> +++ b/drivers/s390/crypto/ap_bus.c
> @@ -211,6 +211,12 @@ int ap_query_configuration(struct ap_config_info *info)
>  }
>  EXPORT_SYMBOL(ap_query_configuration);
>
> +int ap_instructions_installed(void)
> +{
> +	return (ap_instructions_available() == 0);
> +}
> +EXPORT_SYMBOL(ap_instructions_installed);
> +
>  /**
>   * ap_init_configuration(): Allocate and query configuration array.
>   */
Reviewed-by: Harald Freudenberger <freude@linux.vnet.ibm.com>