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    Subject[RFC PATCH v2 10/10] vfio/type1: Attach domain for mdev group
    Date
    When attaching domain to a group of mediated devices which
    all have the domain type attributes set to ATTACH_PARENT,
    we should attach domain to the parent PCI device instead
    of mdev device itself.

    Cc: Ashok Raj <ashok.raj@intel.com>
    Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
    Cc: Kevin Tian <kevin.tian@intel.com>
    Cc: Liu Yi L <yi.l.liu@intel.com>
    Signed-off-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
    Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
    ---
    drivers/vfio/vfio_iommu_type1.c | 22 +++++++++++++++++++++-
    1 file changed, 21 insertions(+), 1 deletion(-)

    diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
    index 64bf55b91de1..c4231df44304 100644
    --- a/drivers/vfio/vfio_iommu_type1.c
    +++ b/drivers/vfio/vfio_iommu_type1.c
    @@ -1411,6 +1411,18 @@ static int vfio_mdev_domain_type(struct device *dev, void *data)
    return -EINVAL;
    }

    +static int vfio_parent_bus_type(struct device *dev, void *data)
    +{
    + struct bus_type **bus = data;
    +
    + if (*bus && *bus != dev->parent->bus)
    + return -EINVAL;
    +
    + *bus = dev->parent->bus;
    +
    + return 0;
    +}
    +
    static int vfio_iommu_type1_attach_group(void *iommu_data,
    struct iommu_group *iommu_group)
    {
    @@ -1458,6 +1470,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
    enum mdev_domain_type type = 0;

    symbol_put(mdev_bus_type);
    + mdev_bus = NULL;

    /* Determine the domain type: */
    ret = iommu_group_for_each_dev(iommu_group, &type,
    @@ -1479,7 +1492,14 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,

    return 0;
    case DOMAIN_TYPE_ATTACH_PARENT:
    - /* FALLTHROUGH */
    + bus = NULL;
    + group->attach_parent = true;
    + /* Set @bus to bus type of the parent: */
    + ret = iommu_group_for_each_dev(iommu_group, &bus,
    + vfio_parent_bus_type);
    + if (ret)
    + goto out_free;
    + break;
    default:
    ret = -EINVAL;
    goto out_free;
    --
    2.17.1
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