[Qemu-devel] [RESEND PATCH 5/6] vfio/pci: add notify framework based on IOMMUObject

["Liu, Yi L" <yi.l.liu@linux.intel.com>]

This patch introduce a notify framework for IOMMUObject.iommu_notifiers.
Introduce VFIOGuestIOMMUObject is to link VFIO Container and the new
IOMMUObject notififiers.

VFIOGuestIOMMUObject instance is allocated when device is assigned and
meanwhile vIOMMU is exposed to guest.

If there is IOMMUObject behind the device AddressSpace(a.ka vIOMMU exposed).
The VFIOGuestIOMMUObject instance would be allocated and inserted to the
VFIOContainer.giommu_object_list.

Signed-off-by: Liu, Yi L <yi.l.liu@linux.intel.com>
---
 hw/vfio/pci.c                 | 39 ++++++++++++++++++++++++++++++++++++++-
 include/hw/vfio/vfio-common.h |  8 ++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index c977ee3..5b77c7e 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2642,6 +2642,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
     VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
     VFIODevice *vbasedev_iter;
     VFIOGroup *group;
+    AddressSpace *as;
+    IOMMUObject *iommu;
     char *tmp, group_path[PATH_MAX], *group_name;
     Error *err = NULL;
     ssize_t len;
@@ -2694,7 +2696,8 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
 
     trace_vfio_realize(vdev->vbasedev.name, groupid);
 
-    group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev), errp);
+    as = pci_device_iommu_address_space(pdev);
+    group = vfio_get_group(groupid, as, errp);
     if (!group) {
         goto error;
     }
@@ -2877,6 +2880,17 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
     vfio_register_req_notifier(vdev);
     vfio_setup_resetfn_quirk(vdev);
 
+    iommu = address_space_iommu_get(as);
+    if (iommu != NULL) {
+        VFIOGuestIOMMUObject *giommu;
+        giommu = g_malloc0(sizeof(*giommu));
+        giommu->iommu = iommu;
+        giommu->container = group->container;
+        QLIST_INSERT_HEAD(&group->container->giommu_object_list,
+                          giommu,
+                          giommu_next);
+    }
+
     return;
 
 out_teardown:
@@ -2907,6 +2921,28 @@ static void vfio_instance_finalize(Object *obj)
     vfio_put_group(group);
 }
 
+static void vfio_release_iommu_object(PCIDevice *pdev)
+{
+    VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
+    AddressSpace *as;
+    IOMMUObject *iommu;
+
+    as = pci_device_iommu_address_space(pdev);
+    iommu = address_space_iommu_get(as);
+    if (iommu != NULL) {
+        VFIOGuestIOMMUObject *giommu, *tmp;
+        VFIOGroup *group;
+        group = vdev->vbasedev.group;
+
+        QLIST_FOREACH_SAFE(giommu,
+                           &group->container->giommu_object_list,
+                           giommu_next, tmp) {
+            QLIST_REMOVE(giommu, giommu_next);
+            g_free(giommu);
+        }
+    }
+    return;
+}
 static void vfio_exitfn(PCIDevice *pdev)
 {
     VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pdev);
@@ -2915,6 +2951,7 @@ static void vfio_exitfn(PCIDevice *pdev)
     vfio_unregister_err_notifier(vdev);
     pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
     vfio_disable_interrupts(vdev);
+    vfio_release_iommu_object(pdev);
     if (vdev->intx.mmap_timer) {
         timer_free(vdev->intx.mmap_timer);
     }
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 702a085..e4963cc 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -88,6 +88,7 @@ typedef struct VFIOContainer {
      * future
      */
     QLIST_HEAD(, VFIOGuestIOMMUMR) giommu_mr_list;
+    QLIST_HEAD(, VFIOGuestIOMMUObject) giommu_object_list;
     QLIST_HEAD(, VFIOHostDMAWindow) hostwin_list;
     QLIST_HEAD(, VFIOGroup) group_list;
     QLIST_ENTRY(VFIOContainer) next;
@@ -101,6 +102,13 @@ typedef struct VFIOGuestIOMMUMR {
     QLIST_ENTRY(VFIOGuestIOMMUMR) giommu_next;
 } VFIOGuestIOMMUMR;
 
+typedef struct VFIOGuestIOMMUObject {
+    VFIOContainer *container;
+    IOMMUObject *iommu;
+    IOMMUNotifier n;
+    QLIST_ENTRY(VFIOGuestIOMMUObject) giommu_next;
+} VFIOGuestIOMMUObject;
+
 typedef struct VFIOHostDMAWindow {
     hwaddr min_iova;
     hwaddr max_iova;
-- 
1.9.1