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

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Date:   Tue, 30 Apr 2019 16:03:30 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     Halil Pasic <pasic@...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 30/04/2019 16:00, Halil Pasic wrote:
> 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
> 

Since there will be another iteration to modify other part of this patch
I will simplify this handling and make the names clearer.

Thanks
Pierre

-- 
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany