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

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Message-ID: <20231204183410.GM1493156@nvidia.com>
Date:   Mon, 4 Dec 2023 14:34:10 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yan Zhao <yan.y.zhao@...el.com>
Cc:     iommu@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, alex.williamson@...hat.com,
        pbonzini@...hat.com, seanjc@...gle.com, joro@...tes.org,
        will@...nel.org, robin.murphy@....com, kevin.tian@...el.com,
        baolu.lu@...ux.intel.com, dwmw2@...radead.org, yi.l.liu@...el.com
Subject: Re: [RFC PATCH 14/42] iommufd: Enable KVM HW page table object to be
 proxy between KVM and IOMMU

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

Jason