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From: Zhangfei Gao <zhangfei.gao@linaro.org>
Date: Thu, 8 Feb 2024 17:11:04 +0800
Message-ID: <CABQgh9G_KCNjj4TvKzG04cQVPsWn2OCSEd_vK10fBtJtWX4E0Q@mail.gmail.com>
Subject: Re: [PATCH v12 00/16] iommu: Prepare to deliver page faults to user space
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>, 
	Robin Murphy <robin.murphy@arm.com>, Jason Gunthorpe <jgg@ziepe.ca>, Kevin Tian <kevin.tian@intel.com>, 
	Jean-Philippe Brucker <jean-philippe@linaro.org>, Nicolin Chen <nicolinc@nvidia.com>, 
	Yi Liu <yi.l.liu@intel.com>, Jacob Pan <jacob.jun.pan@linux.intel.com>, 
	Longfang Liu <liulongfang@huawei.com>, Yan Zhao <yan.y.zhao@intel.com>, 
	Joel Granados <j.granados@samsung.com>, iommu@lists.linux.dev, kvm@vger.kernel.org, 
	linux-kernel@vger.kernel.org
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On Wed, 7 Feb 2024 at 09:39, Lu Baolu <baolu.lu@linux.intel.com> wrote:
>
> When a user-managed page table is attached to an IOMMU, it is necessary
> to deliver IO page faults to user space so that they can be handled
> appropriately. One use case for this is nested translation, which is
> currently being discussed in the mailing list.
>
> I have posted a RFC series [1] that describes the implementation of
> delivering page faults to user space through IOMMUFD. This series has
> received several comments on the IOMMU refactoring, which I am trying to
> address in this series.
>
> The major refactoring includes:
>
> - [PATCH 01 ~ 04] Move include/uapi/linux/iommu.h to
>   include/linux/iommu.h. Remove the unrecoverable fault data definition.
> - [PATCH 05 ~ 06] Remove iommu_[un]register_device_fault_handler().
> - [PATCH 07 ~ 10] Separate SVA and IOPF. Make IOPF a generic page fault
>   handling framework.
> - [PATCH 11 ~ 16] Improve iopf framework.
>
> This is also available at github [2].
>
> [1] https://lore.kernel.org/linux-iommu/20230530053724.232765-1-baolu.lu@linux.intel.com/
> [2] https://github.com/LuBaolu/intel-iommu/commits/preparatory-io-pgfault-delivery-v12
>

Wandering are these patches dropped now,

[PATCH v2 2/6] iommufd: Add iommu page fault uapi data
https://lore.kernel.org/lkml/20231026024930.382898-3-baolu.lu@linux.intel.com/raw

[PATCH v2 4/6] iommufd: Deliver fault messages to user space
https://lore.kernel.org/lkml/20231026024930.382898-5-baolu.lu@linux.intel.com/

And does iouring still be used in user space?

Thanks