Re: [RFC PATCH v2 9/9] iommu/riscv: Add riscv_iommu_attach_dev_nested

[Gong Shuai]

Hi Tan Chi,

On 11/10/2026 9:56 PM, Tan Chi wrote:
> Hi Shuai,
>
> On Tue, Nov 10, 2026 at 07:51:37PM +0800, Gong Shuai wrote:
> >   2. Use the guest PSCID directly, but allocate a separate host
> >      GSCID for each vIOMMU.
>
> I agree with option 2 as well. My earlier suggestion did not account
> for independent PSCID namespaces across multiple vIOMMUs sharing the
> same S2 parent.
>
> Allocating a separate GSCID for each vIOMMU seems simpler than
> maintaining an additional PSCID mapping table.

Agreed. I’ll work on the new version soon.

Thanks,
Shuai

> Thanks,
> Tan Chi