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    SubjectRe: [RFC PATCH 0/3] IOMMU groups

    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,


    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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