Re: [RFC PATCH v2 0/6] powerpc: pSeries: vfio: iommu: Re-enable support for SPAPR TCE VFIO

Jason Gunthorpe
2024-05-01T14:09:44Z

On Tue, Apr 30, 2024 at 03:05:34PM -0500, Shivaprasad G Bhat wrote:
> RFC v1 was posted here [1]. As I was testing more and fixing the
> issues, I realized its clean to have the table_group_ops implemented
> the way it is done on PowerNV and stop 'borrowing' the DMA windows
> for pSeries.
>
> This patch-set implements the iommu table_group_ops for pSeries for
> VFIO SPAPR TCE sub-driver thereby enabling the VFIO support on POWER
> pSeries machines.

Wait, did they previously not have any support?

Again, this TCE stuff needs to go away, not grow. I can grudgingly
accept fixing it where it used to work, but not enabling more HW that
never worked before! :(

Jason