linux-kernel - [PATCH v2 0/3] IOMMU user API enhancement

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Date:   Wed, 10 Jun 2020 21:12:12 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     Yi Liu <yi.l.liu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Christoph Hellwig" <hch@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v2 0/3] IOMMU user API enhancement

IOMMU user API header was introduced to support nested DMA translation and
related fault handling. The current UAPI data structures consist of three
areas that cover the interactions between host kernel and guest:
 - fault handling
 - cache invalidation
 - bind guest page tables, i.e. guest PASID

Future extensions are likely to support more architectures and vIOMMU features.

In the previous discussion, using user-filled data size and feature flags is
made a preferred approach over a unified version number.
https://lkml.org/lkml/2020/1/29/45

In addition to introduce argsz field to data structures, this patchset is also
trying to document the UAPI design, usage, and extension rules. VT-d driver
changes to utilize the new argsz field is included, VFIO usage is to follow.

Thanks,

Jacob


Changeog:

v2:
	- Removed unified API version and helper
	- Introduced argsz for each UAPI data
	- Introduced UAPI doc


Jacob Pan (3):
  docs: IOMMU user API
  iommu/uapi: Add argsz for user filled data
  iommu/vt-d: Sanity check uapi argsz filled by users

 Documentation/userspace-api/iommu.rst | 210 ++++++++++++++++++++++++++++++++++
 drivers/iommu/intel-iommu.c           |  16 +++
 drivers/iommu/intel-svm.c             |  12 ++
 include/uapi/linux/iommu.h            |   6 +
 4 files changed, 244 insertions(+)
 create mode 100644 Documentation/userspace-api/iommu.rst

-- 
2.7.4