[PATCH v2 10/22] vfio/pci: set host iommu context to vIOMMU

[Liu Yi L <yi.l.liu@xxxxxxxxx>]

For vfio-pci devices, it could use pci_device_set/unset_iommu() to
expose host iommu context to vIOMMU emulators. vIOMMU emulators
could make use the methods provided by host iommu context. e.g.
propagate requests to host iommu.

Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Cc: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Eric Auger <eric.auger@xxxxxxxxxx>
Cc: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Liu Yi L <yi.l.liu@xxxxxxxxx>
---
 hw/vfio/pci.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 5e75a95..c140c88 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2717,6 +2717,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
     VFIOPCIDevice *vdev = PCI_VFIO(pdev);
     VFIODevice *vbasedev_iter;
     VFIOGroup *group;
+    VFIOContainer *container;
     char *tmp, *subsys, group_path[PATH_MAX], *group_name;
     Error *err = NULL;
     ssize_t len;
@@ -3028,6 +3029,11 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
     vfio_register_req_notifier(vdev);
     vfio_setup_resetfn_quirk(vdev);
 
+    container = vdev->vbasedev.group->container;
+    if (container->iommu_ctx.initialized) {
+        pci_device_set_iommu_context(pdev, &container->iommu_ctx);
+    }
+
     return;
 
 out_deregister:
@@ -3072,9 +3078,16 @@ static void vfio_instance_finalize(Object *obj)
 static void vfio_exitfn(PCIDevice *pdev)
 {
     VFIOPCIDevice *vdev = PCI_VFIO(pdev);
+    VFIOContainer *container;
 
     vfio_unregister_req_notifier(vdev);
     vfio_unregister_err_notifier(vdev);
+
+    container = vdev->vbasedev.group->container;
+    if (container->iommu_ctx.initialized) {
+        pci_device_unset_iommu_context(pdev);
+    }
+
     pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
     if (vdev->irqchip_change_notifier.notify) {
         kvm_irqchip_remove_change_notifier(&vdev->irqchip_change_notifier);
-- 
2.7.4