@@ -390,6 +390,42 @@ int mdev_device_remove(struct device *dev, bool force_remove)
return 0;
}
+int mdev_set_iommu_device(struct device *dev, struct device *iommu_device)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ mdev->iommu_device = iommu_device;
+
+ return 0;
+}
+EXPORT_SYMBOL(mdev_set_iommu_device);
+
+struct device *mdev_get_iommu_device(struct device *dev)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ return mdev->iommu_device;
+}
+EXPORT_SYMBOL(mdev_get_iommu_device);
+
+int mdev_set_iommu_domain(struct device *dev, void *domain)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ mdev->iommu_domain = domain;
+
+ return 0;
+}
+EXPORT_SYMBOL(mdev_set_iommu_domain);
+
+void *mdev_get_iommu_domain(struct device *dev)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ return mdev->iommu_domain;
+}
+EXPORT_SYMBOL(mdev_get_iommu_domain);
+
static int __init mdev_init(void)
{
return mdev_bus_register();
@@ -34,6 +34,8 @@ struct mdev_device {
struct list_head next;
struct kobject *type_kobj;
bool active;
+ struct device *iommu_device;
+ void *iommu_domain;
};
#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
@@ -14,6 +14,29 @@
#define MDEV_H
struct mdev_device;
+struct iommu_domain;
+
+/*
+ * Called by the parent device driver to set the PCI device which represents
+ * this mdev in iommu protection scope. By default, the iommu device is NULL,
+ * that indicates using vendor defined isolation.
+ *
+ * @dev: the mediated device that iommu will isolate.
+ * @iommu_device: a pci device which represents the iommu for @dev.
+ *
+ * Return 0 for success, otherwise negative error value.
+ */
+int mdev_set_iommu_device(struct device *dev, struct device *iommu_device);
+
+struct device *mdev_get_iommu_device(struct device *dev);
+
+/*
+ * Called by vfio iommu modules to save the iommu domain after a domain being
+ * attached to the mediated device.
+ */
+int mdev_set_iommu_domain(struct device *dev, void *domain);
+
+void *mdev_get_iommu_domain(struct device *dev);
/**
* struct mdev_parent_ops - Structure to be registered for each parent device to
A parent device might create different types of mediated devices. For example, a mediated device could be created by the parent device with full isolation and protection provided by the IOMMU. One usage case could be found on Intel platforms where a mediated device is an assignable subset of a PCI, the DMA requests on behalf of it are all tagged with a PASID. Since IOMMU supports PASID-granular translations (scalable mode in vt-d 3.0), this mediated device could be individually protected and isolated by an IOMMU. This patch adds two new members in struct mdev_device: * iommu_device - This, if set, indicates that the mediated device could be fully isolated and protected by IOMMU via attaching an iommu domain to this device. If empty, it indicates using vendor defined isolation. * iommu_domain - This is a place holder for an iommu domain. A domain could be store here for later use once it has been attached to the iommu_device of this mdev. Below helpers are added to set and get above iommu device and iommu domain pointers. * mdev_set/get_iommu_device(dev, iommu_device) - Set or get the iommu device which represents this mdev in IOMMU's device scope. Drivers don't need to set the iommu device if it uses vendor defined isolation. * mdev_set/get_iommu_domain(domain) - A iommu domain which has been attached to the iommu device in order to protect and isolate the mediated device will be kept in the mdev data structure and could be retrieved later. 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> Suggested-by: Kevin Tian <kevin.tian@intel.com> Suggested-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> --- drivers/vfio/mdev/mdev_core.c | 36 ++++++++++++++++++++++++++++++++ drivers/vfio/mdev/mdev_private.h | 2 ++ include/linux/mdev.h | 23 ++++++++++++++++++++ 3 files changed, 61 insertions(+)