Re: [PATCH v3 0/4] User API for nested shared virtual address (SVA)

[Jacob Pan]

Hi Jean,

Just wondering if you have more comments on ioasid custom allocator, v3
is largely the same as v2 other than shuffling header within the set.

Thanks,

Jacob

On Tue,  1 Oct 2019 16:33:21 -0700
Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> 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:
> 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     | 432
> +++++++++++++++++++++++++++++++++++++++++++++
> drivers/iommu/iommu.c      |  30 ++++ include/linux/ioasid.h     |
> 76 ++++++++ include/linux/iommu.h      |  36 ++++
>  include/uapi/linux/iommu.h | 169 ++++++++++++++++++
>  7 files changed, 748 insertions(+)
>  create mode 100644 drivers/iommu/ioasid.c
>  create mode 100644 include/linux/ioasid.h
> 

[Jacob Pan]