[PATCH v13 20/22] vfio: Move the IOMMU_CAP_CACHE_COHERENCY check in __vfio_register_dev()

Yi Liu
2023-06-16T09:41:18Z

The IOMMU_CAP_CACHE_COHERENCY check only applies to the physical devices
that are IOMMU-backed. But it is now in the group code. If want to compile
vfio_group infrastructure out, this check needs to be moved out of the group
code.

Another reason for this change is to fail the device registration for the
physical devices that do not have IOMMU if the group code is not compiled
as the cdev interface does not support such devices.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
drivers/vfio/group.c | 10 ----------
drivers/vfio/vfio_main.c | 11 +++++++++++
2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/vfio/group.c b/drivers/vfio/group.c
index 41a09a2df690..c2e0128323a7 100644
--- a/drivers/vfio/group.c
+++ b/drivers/vfio/group.c
@@ -687,16 +687,6 @@ static struct vfio_group *vfio_group_find_or_alloc(struct device *dev)
if (!iommu_group)
return ERR_PTR(-EINVAL);

- /*
- * VFIO always sets IOMMU_CACHE because we offer no way for userspace to
- * restore cache coherency. It has to be checked here because it is only
- * valid for cases where we are using iommu groups.
- */
- if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) {
- iommu_group_put(iommu_group);
- return ERR_PTR(-EINVAL);
- }
-
mutex_lock(&vfio.group_lock);
group = vfio_group_find_from_iommu(iommu_group);
if (group) {
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 51c80eb32af6..ffb4585b7f0e 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -292,6 +292,17 @@ static int __vfio_register_dev(struct vfio_device *device,
if (ret)
return ret;

+ /*
+ * VFIO always sets IOMMU_CACHE because we offer no way for userspace to
+ * restore cache coherency. It has to be checked here because it is only
+ * valid for cases where we are using iommu groups.
+ */
+ if (type == VFIO_IOMMU && !vfio_device_is_noiommu(device) &&
+ !device_iommu_capable(device->dev, IOMMU_CAP_CACHE_COHERENCY)) {
+ ret = -EINVAL;
+ goto err_out;
+ }
+
ret = vfio_device_add(device);
if (ret)
goto err_out;
--
2.34.1