linux-kernel - Re: [PATCH v2 2/3] vfio: ap: ioctl definitions for AP Queue Interrupt Control

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Date:   Tue, 27 Nov 2018 18:46:35 +0100
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     borntraeger@...ibm.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,
        pasic@...ux.ibm.com, david@...hat.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, freude@...ux.ibm.com, mimu@...ux.ibm.com
Subject: Re: [PATCH v2 2/3] vfio: ap: ioctl definitions for AP Queue Interrupt
 Control

On 27/11/2018 18:22, Alex Williamson wrote:
> On Thu, 22 Nov 2018 18:11:14 +0100
> Pierre Morel <pmorel@...ux.ibm.com> wrote:
> 
>> We define two VFIO ioctl command to setup and clear
>> the AP Queues interrupt.
>>
>> Arguments passed by the guest are:
>> - the apqn, AP queue number
>> - the Notification by address
>> - the identifier of the previously associated adapter
> 
> 
> We have an extensible VFIO_DEVICE_SET_IRQS ioctl already, why does AP
> need its own?

For no good reason.
Sorry for this.
I will change for the use of the standard VFIO_DEVICE_SET_IRQS.

Thanks Alex.

Regards,
Pierre

> 
> 
>> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
>> ---
>>   include/uapi/linux/vfio.h | 25 +++++++++++++++++++++++++
>>   1 file changed, 25 insertions(+)
>>
>> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
>> index 8131028..9a1b350 100644
>> --- a/include/uapi/linux/vfio.h
>> +++ b/include/uapi/linux/vfio.h
>> @@ -866,6 +866,31 @@ struct vfio_iommu_spapr_tce_remove {
>>   };
>>   #define VFIO_IOMMU_SPAPR_TCE_REMOVE	_IO(VFIO_TYPE, VFIO_BASE + 20)
>>   
>> +/**
>> + * VFIO_AP_SET_IRQ - _IOWR(VFIO_TYPE, VFIO_BASE + 21, struct vfio_ap_aqic)
>> + *
>> + * Setup IRQ for an AP Queue
>> + * @cmd contains the AP queue number (apqn)
>> + * @status receives the resulting status of the command
>> + * @nib is the Notification Indicator byte address
>> + * @adapter_id allows to retrieve the associated adapter
>> + */
>> +struct vfio_ap_aqic {
>> +	__u32   argsz;
>> +	__u32   flags;
>> +	/* out */
>> +	__u32 status;
>> +	/* in */
>> +	__u32 adapter_id;
>> +	__u64 nib;
>> +	__u16 apqn;
>> +	__u8 isc;
>> +	__u8 reserved[5];
>> +};
>> +#define VFIO_AP_SET_IRQ			_IO(VFIO_TYPE, VFIO_BASE + 21)
>> +#define VFIO_AP_CLEAR_IRQ		_IO(VFIO_TYPE, VFIO_BASE + 22)
>> +
>>   /* ***************************************************************** */
>>   
>> +
>>   #endif /* _UAPIVFIO_H */
> 


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