Re: [PATCH V2 4/4] intel-iommu: PASID support

[Yi Liu]

On 2022/3/29 12:54, Jason Wang wrote:
> 在 2022/3/28 下午4:45, Yi Liu 写道:
> > On 2022/3/21 13:54, Jason Wang wrote:
> > > This patch introduce ECAP_PASID via "x-pasid-mode". Based on the
> > > existing support for scalable mode, we need to implement the following
> > > missing parts:
> > >
> > > 1) tag VTDAddressSpace with PASID and support IOMMU/DMA translation
> > >     with PASID
> >
> > should it be tagging with bdf+pasid?
>
>
> The problem is BDF is programmable by the guest. So we may end up 
> duplicated BDFs. That's why the code uses struct PCIBus.

how about the devfn? will it also change? taggiing addressspace with
BDF+PASID mostly suits the spec since the PASID table is per-bdf. If
bus number may change, using PCIBus is fine.

Regards,
Yi Liu