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Subject[RFC PATCH v2 09/10] vfio/type1: Determine domain type of an mdev group
Date
This adds the support to determine the domain type of a group
of mediated devices according to the domain type attribute of
each device.

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 | 47 ++++++++++++++++++++++++++++++---
1 file changed, 43 insertions(+), 4 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 89e2e6123223..64bf55b91de1 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1390,6 +1390,27 @@ static void vfio_iommu_detach_group(struct vfio_domain *domain,
iommu_detach_group(domain->domain, group->iommu_group);
}

+static int vfio_mdev_domain_type(struct device *dev, void *data)
+{
+ enum mdev_domain_type new, *old = data;
+ enum mdev_domain_type (*fn)(struct device *dev);
+
+ fn = symbol_get(mdev_get_domain_type);
+ if (fn) {
+ new = fn(dev);
+ symbol_put(mdev_get_domain_type);
+
+ if (*old && *old != new)
+ return -EINVAL;
+
+ *old = new;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
static int vfio_iommu_type1_attach_group(void *iommu_data,
struct iommu_group *iommu_group)
{
@@ -1433,9 +1454,19 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,

mdev_bus = symbol_get(mdev_bus_type);

- if (mdev_bus) {
- if ((bus == mdev_bus) && !iommu_present(bus)) {
- symbol_put(mdev_bus_type);
+ if (mdev_bus && bus == mdev_bus) {
+ enum mdev_domain_type type = 0;
+
+ symbol_put(mdev_bus_type);
+
+ /* Determine the domain type: */
+ ret = iommu_group_for_each_dev(iommu_group, &type,
+ vfio_mdev_domain_type);
+ if (ret)
+ goto out_free;
+
+ switch (type) {
+ case DOMAIN_TYPE_NO_IOMMU:
if (!iommu->external_domain) {
INIT_LIST_HEAD(&domain->group_list);
iommu->external_domain = domain;
@@ -1445,11 +1476,19 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
list_add(&group->next,
&iommu->external_domain->group_list);
mutex_unlock(&iommu->lock);
+
return 0;
+ case DOMAIN_TYPE_ATTACH_PARENT:
+ /* FALLTHROUGH */
+ default:
+ ret = -EINVAL;
+ goto out_free;
}
- symbol_put(mdev_bus_type);
}

+ if (mdev_bus)
+ symbol_put(mdev_bus_type);
+
domain->domain = iommu_domain_alloc(bus);
if (!domain->domain) {
ret = -EIO;
--
2.17.1
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