linux-kernel - Re: [PATCH v4 0/4] User API for nested shared virtual address (SVA)

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Date:   Mon, 14 Oct 2019 10:14:05 -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,

Just another gentle reminder. I think we have reached consensus in this
common code. Jean and Eric can confirm.

Thanks,

Jacob

On Mon, 7 Oct 2019 12:39:12 -0700
Jacob Pan <jacob.jun.pan@...ux.intel.com> wrote:

> 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]

[Jacob Pan]