linux-kernel - Re: [PATCH v4 10/17] iommufd: Support IOMMU_HWPT

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Message-ID: <20231013151923.GV3952@nvidia.com>
Date:   Fri, 13 Oct 2023 12:19:23 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yi Liu <yi.l.liu@...el.com>
Cc:     joro@...tes.org, alex.williamson@...hat.com, kevin.tian@...el.com,
        robin.murphy@....com, baolu.lu@...ux.intel.com, cohuck@...hat.com,
        eric.auger@...hat.com, nicolinc@...dia.com, kvm@...r.kernel.org,
        mjrosato@...ux.ibm.com, chao.p.peng@...ux.intel.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        zhenzhong.duan@...el.com, joao.m.martins@...cle.com
Subject: Re: [PATCH v4 10/17] iommufd: Support IOMMU_HWPT_ALLOC allocation
 with user data

On Thu, Sep 21, 2023 at 12:51:31AM -0700, Yi Liu wrote:
> IOMMU_HWPT_ALLOC already supports iommu_domain allocation for usersapce.
> But it can only allocate a hw_pagetable that associates to a given IOAS,
> i.e. only a kernel-managed hw_pagetable of IOMMU_HWPT_TYPE_DEFAULT type.
> 
> IOMMU drivers can now support user-managed hw_pagetables, for two-stage
> translation use cases, that require user data input from the user space.
> 
> Extend the IOMMU_HWPT_ALLOC ioctl to accept non-default hwpt_type with a
> type specified user data. Also, update the @pt_id to accept hwpt_id too
> besides an ioas_id. Then, pass them to the downstream alloc_fn().
> 
> Co-developed-by: Nicolin Chen <nicolinc@...dia.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> Signed-off-by: Yi Liu <yi.l.liu@...el.com>
> ---
>  drivers/iommu/iommufd/hw_pagetable.c | 19 ++++++++++++++++++-
>  include/uapi/linux/iommufd.h         | 23 +++++++++++++++++++++--
>  2 files changed, 39 insertions(+), 3 deletions(-)

Can we also come with a small vt-d patch that does implement an op for
this? Or is it too big?

It would be nice if we could wrap IOMMU_HWPT_ALLOC into one
self-contained series and another series for invalidate.

Jason