Re: [RFC PATCH 14/42] iommufd: Enable KVM HW page table object to be proxy between KVM and IOMMU

Yan Zhao
2023-12-05T07:38:28Z

On Mon, Dec 04, 2023 at 02:34:10PM -0400, Jason Gunthorpe wrote:
> On Sat, Dec 02, 2023 at 05:22:16PM +0800, Yan Zhao wrote:
> > +config IOMMUFD_KVM_HWPT
> > + bool "Supports KVM managed HW page tables"
> > + default n
> > + help
> > + Selecting this option will allow IOMMUFD to create IOMMU stage 2
> > + page tables whose paging structure and mappings are managed by
> > + KVM MMU. IOMMUFD serves as proxy between KVM and IOMMU driver to
> > + allow IOMMU driver to get paging structure meta data and cache
> > + invalidate notifications from KVM.
>
> I'm not sure we need a user selectable kconfig for this..
>
> Just turn it on if we have kvm turned on an iommu driver implements it
>
Got it, thanks!