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Message-ID: <20191007123912.60c19a79@jacob-builder>
Date: Mon, 7 Oct 2019 12:39:12 -0700
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: iommu@...ts.linux-foundation.org,
LKML <linux-kernel@...r.kernel.org>,
Joerg Roedel <joro@...tes.org>,
David Woodhouse <dwmw2@...radead.org>,
Alex Williamson <alex.williamson@...hat.com>,
Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc: "Yi Liu" <yi.l.liu@...el.com>,
"Tian, Kevin" <kevin.tian@...el.com>,
Raj Ashok <ashok.raj@...el.com>,
"Christoph Hellwig" <hch@...radead.org>,
"Lu Baolu" <baolu.lu@...ux.intel.com>,
Jonathan Cameron <jic23@...nel.org>,
Eric Auger <eric.auger@...hat.com>,
Jerry Snitselaar <jsnitsel@...hat.com>,
jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v4 0/4] User API for nested shared virtual address (SVA)
Hi Joerg and all,
Just wondering if you have more comments on this series.
Thanks,
Jacob
On Wed, 2 Oct 2019 12:42:39 -0700
Jacob Pan <jacob.jun.pan@...ux.intel.com> wrote:
> This set consists of IOMMU APIs to support SVA in the guest, a.k.a
> nested SVA. As the complete SVA support is complex, we break down the
> enabling effort into three stages:
> 1. PCI device direct assignment
> 2. Fault handling, especially page request service support
> 3. Mediated device assignment
>
> Each stage includes common API and vendor specific IOMMU driver
> changes. This series is the common uAPI for stage #1. It is intended
> to build consensus on the interface which all vendors reply on.
>
> This series is extracted from the complete stage1 set which includes
> VT-d code. https://lkml.org/lkml/2019/8/15/951
>
> Changes:
> - Use spinlock instead of mutex to protect ioasid custom allocators.
> This is to support callers in atomic context
> - Added more padding to guest PASID bind data for future extensions,
> suggested by Joerg.
> After much thinking, I did not do name change from PASID to IOASID in
> the uAPI, considering we have been using PASID in the rest of uAPIs.
> IOASID will remain used within the kernel.
>
> For more discussions lead to this series, checkout LPC 2019
> VFIO/IOMMU/PCI microconference materials.
> https://linuxplumbersconf.org/event/4/sessions/66/#20190909
>
>
> Change log:
> v4: - minor patch regroup and fixes based on review from Jean
> v3: - include errno.h in ioasid.h to fix compile error
> - rebased to v5.4-rc1, no change
>
> v2:
> - Addressed review comments by Jean on IOASID custom
> allocators, locking fix, misc control flow fix.
> - Fixed a compile error with missing header errno.h
> - Updated Jean-Philiippe's new email and updateded
> reviewed-by tag
>
> Jacob Pan (2):
> iommu/ioasid: Add custom allocators
> iommu: Introduce guest PASID bind function
>
> Jean-Philippe Brucker (1):
> iommu: Add I/O ASID allocator
>
> Yi L Liu (1):
> iommu: Introduce cache_invalidate API
>
> drivers/iommu/Kconfig | 4 +
> drivers/iommu/Makefile | 1 +
> drivers/iommu/ioasid.c | 422
> +++++++++++++++++++++++++++++++++++++++++++++
> drivers/iommu/iommu.c | 30 ++++ include/linux/ioasid.h |
> 76 ++++++++ include/linux/iommu.h | 36 ++++
> include/uapi/linux/iommu.h | 169 ++++++++++++++++++
> 7 files changed, 738 insertions(+)
> create mode 100644 drivers/iommu/ioasid.c
> create mode 100644 include/linux/ioasid.h
>
[Jacob Pan]
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