linux-kernel - Re: [PATCH v12 00/16] iommu: Prepare to deliver page faults to user space

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Date: Thu, 8 Feb 2024 17:11:04 +0800
From: Zhangfei Gao <zhangfei.gao@...aro.org>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
	Robin Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>, 
	Jean-Philippe Brucker <jean-philippe@...aro.org>, Nicolin Chen <nicolinc@...dia.com>, 
	Yi Liu <yi.l.liu@...el.com>, Jacob Pan <jacob.jun.pan@...ux.intel.com>, 
	Longfang Liu <liulongfang@...wei.com>, Yan Zhao <yan.y.zhao@...el.com>, 
	Joel Granados <j.granados@...sung.com>, iommu@...ts.linux.dev, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 00/16] iommu: Prepare to deliver page faults to user space

On Wed, 7 Feb 2024 at 09:39, Lu Baolu <baolu.lu@...ux.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