Store the value of @caps returned by iommufd_backend_get_device_info()
in a new field HostIOMMUDeviceCaps::hw_caps. Right now the only value is
whether device IOMMU supports dirty tracking (IOMMU_HW_CAP_DIRTY_TRACKING).

This is in preparation for HostIOMMUDevice::realize() being called early
during attach_device().

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 include/sysemu/host_iommu_device.h | 4 ++++
 hw/vfio/iommufd.c                  | 1 +
 2 files changed, 5 insertions(+)

diff --git a/include/sysemu/host_iommu_device.h b/include/sysemu/host_iommu_device.h
index cdeeccec7671..fd03ce766522 100644
--- a/include/sysemu/host_iommu_device.h
+++ b/include/sysemu/host_iommu_device.h
@@ -19,9 +19,13 @@
  * struct HostIOMMUDeviceCaps - Define host IOMMU device capabilities.
  *
  * @type: host platform IOMMU type.
+ *
+ * @hw_caps: host platform IOMMU capabilities (e.g. on IOMMUFD this represents
+ *           the @out_capabilities value returned from IOMMU_GET_HW_INFO ioctl)
  */
 typedef struct HostIOMMUDeviceCaps {
     uint32_t type;
+    uint64_t hw_caps;
 } HostIOMMUDeviceCaps;
 
 #define TYPE_HOST_IOMMU_DEVICE "host-iommu-device"
diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
index 028533bc39b9..7a10b1e90a6f 100644
--- a/hw/vfio/iommufd.c
+++ b/hw/vfio/iommufd.c
@@ -724,6 +724,7 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
 
     hiod->name = g_strdup(vdev->name);
     caps->type = type;
+    caps->hw_caps = hw_caps;
 
     return true;
 }
-- 
2.17.2