linux-kernel - Re: [RFC PATCH 2/5] iommu/vt-d: Add generic IO page table support

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Message-ID: <20231106193228.GU4634@ziepe.ca>
Date:   Mon, 6 Nov 2023 15:32:28 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Tina Zhang <tina.zhang@...el.com>
Cc:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>, joro@...tes.org,
        will@...nel.org, Yi Liu <yi.l.liu@...el.com>,
        virtualization@...ts.linux-foundation.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/5] iommu/vt-d: Add generic IO page table support

On Mon, Nov 06, 2023 at 02:12:23AM -0500, Tina Zhang wrote:
> Add basic hook up code to implement generic IO page table framework.
> 
> Signed-off-by: Tina Zhang <tina.zhang@...el.com>
> ---
>  drivers/iommu/intel/Kconfig |  1 +
>  drivers/iommu/intel/iommu.c | 94 +++++++++++++++++++++++++++++++++++++
>  drivers/iommu/intel/iommu.h |  7 +++
>  drivers/iommu/io-pgtable.c  |  3 ++
>  include/linux/io-pgtable.h  |  2 +
>  5 files changed, 107 insertions(+)

If this is going to happen can we also convert vt-d to actually use
the io page table stuff directly and shuffle the code around so it is
structured like the rest of the io page table implementations?

Jason