RE: [RFC PATCH 0/7] support vfio platform PMD

[Tomasz Duszynski <tduszynski@marvell.com>]

Hi Chenbo, 

>-----Original Message-----
>From: Xia, Chenbo <chenbo.xia@intel.com>
>Sent: Friday, December 23, 2022 8:05 AM
>To: Tomasz Duszynski <tduszynski@marvell.com>; dev@dpdk.org
>Cc: thomas@monjalon.net; Jerin Jacob Kollanukkaran <jerinj@marvell.com>
>Subject: [EXT] RE: [RFC PATCH 0/7] support vfio platform PMD
>
>External Email
>
>----------------------------------------------------------------------
>> -----Original Message-----
>> From: Tomasz Duszynski <tduszynski@marvell.com>
>> Sent: Friday, December 23, 2022 7:24 AM
>> To: dev@dpdk.org
>> Cc: thomas@monjalon.net; jerinj@marvell.com; Tomasz Duszynski
>> <tduszynski@marvell.com>
>> Subject: [RFC PATCH 0/7] support vfio platform PMD
>>
>> This series aims to add support for managing vfio platform devices
>> from userspace application conveniently i.e without going through the
>> configuration required by vfio and opencoding everything. Instead
>> convenience helpers are provided.
>>
>> vfio platform devices, from the kernel standpoint, are ones that do
>> not have built-in discovery capabilities and are behind an IOMMU.
>>
>> This PMD is backed by both vfio-platform and vfio kernel drivers and
>> ideally should give access to all vfio capabilities. As of now, access
>> to memory maps and DMA are supported.
>>
>> PMD requires platform bus support [1].
>>
>> [1]
>> https://urldefense.proofpoint.com/v2/url?u=https-3A__lore.kernel.org_d
>> pdk-2Ddev_20221222000106.270619-2D1-2D&d=DwIFAg&c=nKjWec2b6R0mOyPaz7xt
>> fQ&r=PZNXgrbjdlXxVEEGYkxIxRndyEUwWU_ad5ce22YI6Is&m=D9rwjUu4gMDK-DA_YvF
>> eU6OBKRUXqZVQ7Nfg3O4xldhUMqQsXQx4AM9La3PpF1Bd&s=L93CKF1oLmgSm7z50nWbVf
>> 4FFDww_noCSxOENlbfXGY&e=
>> tduszynski@marvell.com/
>
>I have not looked into all details. But just wondering: why not making this part of the platform
>bus. This seems generic and then vendors can have their own platform drivers.
>

Valid point. I'll rethink current approach.  

>Thanks,
>Chenbo