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SubjectRe: [RFC PATCH 0/3] IOMMU groups
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Ping. Does this approach look like it could satisfy your desire for a
more integrated group layer? I'd really like to move VFIO forward,
we've been stalled on this long enough. David Woodhouse, I think this
provides the quirking you're looking for for device like the Ricoh, do
you have any other requirements for a group layer? Thanks,

Alex

On Mon, 2012-04-02 at 15:14 -0600, Alex Williamson wrote:
> This series attempts to make IOMMU device grouping a slightly more
> integral part of the device model. iommu_device_groups were originally
> introduced to support the VFIO user space driver interface which needs
> to understand the granularity of device isolation in order to ensure
> security of devices when assigned for user access. This information
> was provided via a simple group identifier from the IOMMU driver allowing
> VFIO to walk devices and assemble groups itself.
>
> The feedback received from this was that groups should be the effective
> unit of work for the IOMMU API. The existing model of allowing domains
> to be created and individual devices attached ignores many of the
> restrictions of the IOMMU, whether by design, by topology or by defective
> devices. Additionally we should be able to use the grouping information
> at the dma ops layer for managing domains and quirking devices.
>
> This series is a sketch at implementing only those aspects and leaving
> everything else about the multifaceted hairball of Isolation groups for
> another API. Please comment and let me know if this seems like the
> direction we should be headed. Thanks,
>
> Alex
>
>
> ---
>
> Alex Williamson (3):
> iommu: Create attach/detach group interface
> iommu: Create basic group infrastructure and update AMD-Vi & Intel VT-d
> iommu: Introduce iommu_group
>
>
> drivers/iommu/amd_iommu.c | 50 ++++++----
> drivers/iommu/intel-iommu.c | 76 ++++++++--------
> drivers/iommu/iommu.c | 210 ++++++++++++++++++++++++++++++++++++++-----
> include/linux/device.h | 2
> include/linux/iommu.h | 43 +++++++++
> 5 files changed, 301 insertions(+), 80 deletions(-)





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