Subject: Re: [PATCH 3/8] drivers/vfio: New IOCTL command VFIO_EEH_INFO

From: Alexander Graf <[email-masked]>
Date: Tue, 20 May 2014 12:02:22 +0200

On 20.05.14 10:28, Gavin Shan wrote:
> On Mon, May 19, 2014 at 06:37:24PM -0600, Alex Williamson wrote:
>> On Tue, 2014-05-20 at 10:22 +1000, Gavin Shan wrote:
>>> On Mon, May 19, 2014 at 04:33:10PM -0600, Alex Williamson wrote:
>>>> On Wed, 2014-05-14 at 14:11 +1000, Gavin Shan wrote:
>>>>> The patch adds new IOCTL command VFIO_EEH_INFO to VFIO container
>>>>> to support EEH functionality for PCI devices, which have been
>>>>> passed from host to guest via VFIO.

[...]

>>> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
>>> index cb9023d..1fd1bfb 100644
>>> --- a/include/uapi/linux/vfio.h
>>> +++ b/include/uapi/linux/vfio.h
>>> @@ -455,6 +455,63 @@ struct vfio_iommu_spapr_tce_info {
>>>   
>>>   #define VFIO_IOMMU_SPAPR_TCE_GET_INFO	_IO(VFIO_TYPE, VFIO_BASE + 12)
>>>   
>>> +/*
>>> + * The VFIO EEH info struct provides way to support EEH functionality
>>> + * for PCI device that is passed from host to guest via VFIO.
>>> + */
>>> +#define VFIO_EEH_OP_MAP		0
>>> +#define VFIO_EEH_OP_UNMAP	1
>>> +#define VFIO_EEH_OP_SET_OPTION	2
>>> +#define VFIO_EEH_OP_GET_ADDR	3
>>> +#define VFIO_EEH_OP_GET_STATE	4
>>> +#define VFIO_EEH_OP_PE_RESET	5
>>> +#define VFIO_EEH_OP_PE_CONFIG	6
>>>> Is this really an "info" ioctl?
>>>>
>>> Yeah, "VFIO_EEH_INFO" isn't a good name. How about to have "VFIO_EEH_HANDLER" ?
>> VFIO_EEH_OP perhaps.  Thanks,
>>
> Ok. Will rename it to VFIO_EEH_OP in next revision.

Is there any benefit of a multiplexing EEH ioctl over just 7 individual 
ioctls?

Alex