[PATCH] vfio/iommufd: no hw_info for mediated devices

[Steve Sistare <steven.sistare@oracle.com>]

IOMMU_GET_HW_INFO fails for a vfio mediated device (aka mdev), because
the devid is associated with kernel type IOMMUFD_OBJ_ACCESS, not
IOMMUFD_OBJ_DEVICE.  Assume IOMMU_HW_INFO_TYPE_NONE and proceed.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 hw/vfio/iommufd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index cb7257b..d8928d4 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -635,6 +635,7 @@ static void vfio_iommu_iommufd_class_init(ObjectClass *klass, void *data)
 static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
                                       Error **errp)
 {
+    Error *err = NULL;
     VFIODevice *vdev = opaque;
     HostIOMMUDeviceCaps *caps = &hiod->caps;
     enum iommu_hw_info_type type;
@@ -645,8 +646,9 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
     hiod->agent = opaque;
 
     if (!iommufd_backend_get_device_info(vdev->iommufd, vdev->devid,
-                                         &type, &data, sizeof(data), errp)) {
-        return false;
+                                         &type, &data, sizeof(data), &err)) {
+        warn_report_err(err);
+        type = IOMMU_HW_INFO_TYPE_NONE;
     }
 
     hiod->name = g_strdup(vdev->name);
-- 
1.8.3.1