[RFC v7 06/25] vfio: pass nesting requirement into vfio_get_group()

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

This patch passes the nesting requirement into vfio_get_group() to
indicate whether VFIO_TYPE1_NESTING_IOMMU is required.

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/ap.c                  | 2 +-
 hw/vfio/ccw.c                 | 2 +-
 hw/vfio/common.c              | 3 ++-
 hw/vfio/pci.c                 | 9 ++++++++-
 hw/vfio/platform.c            | 2 +-
 include/hw/vfio/vfio-common.h | 3 ++-
 6 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 95564c1..933b118 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -82,7 +82,7 @@ static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
 
     g_free(group_path);
 
-    return vfio_get_group(groupid, &address_space_memory, errp);
+    return vfio_get_group(groupid, &address_space_memory, false, errp);
 }
 
 static void vfio_ap_realize(DeviceState *dev, Error **errp)
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 06e69d7..7c20103 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -620,7 +620,7 @@ static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
         return NULL;
     }
 
-    return vfio_get_group(groupid, &address_space_memory, errp);
+    return vfio_get_group(groupid, &address_space_memory, false, errp);
 }
 
 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 0b3593b..89c6a25 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1453,7 +1453,8 @@ static void vfio_disconnect_container(VFIOGroup *group)
     }
 }
 
-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
+VFIOGroup *vfio_get_group(int groupid, AddressSpace *as,
+                          bool want_nested, Error **errp)
 {
     VFIOGroup *group;
     char path[32];
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 6838bcc..9d8d27f 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2717,6 +2717,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
     int groupid;
     int i, ret;
     bool is_mdev;
+    bool want_nested;
 
     if (!vdev->vbasedev.sysfsdev) {
         if (!(~vdev->host.domain || ~vdev->host.bus ||
@@ -2775,7 +2776,13 @@ 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);
+    if (pci_device_get_iommu_attr(pdev,
+                         IOMMU_WANT_NESTING, &want_nested)) {
+        want_nested = false;
+    }
+
+    group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev),
+                           want_nested, errp);
     if (!group) {
         goto error;
     }
diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index ac2cefc..7ad7702 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -580,7 +580,7 @@ static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
 
     trace_vfio_platform_base_device_init(vbasedev->name, groupid);
 
-    group = vfio_get_group(groupid, &address_space_memory, errp);
+    group = vfio_get_group(groupid, &address_space_memory, false, errp);
     if (!group) {
         return -ENOENT;
     }
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index fd56420..a77d0ed 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -174,7 +174,8 @@ void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled);
 void vfio_region_exit(VFIORegion *region);
 void vfio_region_finalize(VFIORegion *region);
 void vfio_reset_handler(void *opaque);
-VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp);
+VFIOGroup *vfio_get_group(int groupid, AddressSpace *as,
+                          bool want_nested, Error **errp);
 void vfio_put_group(VFIOGroup *group);
 int vfio_get_device(VFIOGroup *group, const char *name,
                     VFIODevice *vbasedev, Error **errp);
-- 
2.7.4