Re: [PATCH v13 0/5] vfio/dma-buf: add TPH support for peer-to-peer access - ping

["Christian König" <christian.koenig@amd.com>]

On 9/15/26 13:37, Leon Romanovsky wrote:
> On Fri, Sep 11, 2026 at 09:58:28AM +0200, Christian König wrote:
>> Hi Zhiping,
>>
>> sorry I'm completely underwater at the moment and don't have time to take another look at the full set.
>>
>> But IIRC you already fixed my documentation requirements and skimming over the patch once more I can't see anything wrong of hand.
>>
>> So feel free to add Acked-by: Christian König <christian.koenig@amd.com> to patch "dma-buf: add optional get_pci_tph() callback" and push it upstream through the VFIO channels.
> 
> Christian,
> 
> I'm slightly confused here. In the other thread, you expressed concerns
> about having PCI details common to every device in the P2P world in the
> dma-buf code, but here you seem fine with adding a niche P2P feature.

That one is only using u16 and u8 types and has no dependency on the PCI subsystem whatsoever.

Giving those adjacent information sounds perfectly fine to me, we just can't have any hard dependency on PCI subsystem types or functions.

DMA-buf itself is massively used with vendor specific P2P interconnects, PCI P2P is just a special case of that.

Regards,
Christian.

> 
> Thanks,