linux-kernel - Re: [PATCH v7 3/4] s390: ap: implement PAPQ AQIC interception in kernel

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Date:   Tue, 30 Apr 2019 16:00:31 +0200
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>
Cc:     borntraeger@...ibm.com, alex.williamson@...hat.com,
        cohuck@...hat.com, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        frankja@...ux.ibm.com, akrowiak@...ux.ibm.com, david@...hat.com,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        freude@...ux.ibm.com, mimu@...ux.ibm.com
Subject: Re: [PATCH v7 3/4] s390: ap: implement PAPQ AQIC interception in
 kernel

On Fri, 26 Apr 2019 15:01:27 +0200
Pierre Morel <pmorel@...ux.ibm.com> wrote:

> diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
> index 18dcc4d..7cc02ff 100644
> --- a/drivers/s390/crypto/vfio_ap_private.h
> +++ b/drivers/s390/crypto/vfio_ap_private.h
> @@ -4,6 +4,7 @@
>   *
>   * Author(s): Tony Krowiak <akrowiak@...ux.ibm.com>
>   *	      Halil Pasic <pasic@...ux.ibm.com>
> + *	      Pierre Morel <pmorel@...ux.ibm.com>
>   *
>   * Copyright IBM Corp. 2018
>   */
> @@ -90,4 +91,14 @@ struct ap_matrix_mdev {
>  extern int vfio_ap_mdev_register(void);
>  extern void vfio_ap_mdev_unregister(void);
>  
> +struct vfio_ap_queue {
> +	struct ap_matrix_mdev *matrix_mdev;
> +	unsigned long a_nib;
> +	unsigned long a_pfn;
> +	unsigned long p_pfn;
> +	int	apqn;
> +#define VFIO_AP_ISC_INVALID 0xff

How about -1?

> +	unsigned char a_isc;
> +	unsigned char p_isc;
> +};
>  #endif /* _VFIO_AP_PRIVATE_H_ */

I assume a_ and p_ are for argument and private, or? Anyway it would be
nice to have nicer names for these.

If the a_ members are really just arguments, we could probably live
without the. I'm fine either way.

Regards,
Halil