Now we support two types of iommu backends, let's add the capability
to select one of them. This depends on whether an iommufd object has
been linked with the vfio-ap device:
if the user wants to use the legacy backend, it shall not
link the vfio-ap device with any iommufd object:
-device vfio-ap,sysfsdev=/sys/bus/mdev/devices/XXX
This is called the legacy mode/backend.
If the user wants to use the iommufd backend (/dev/iommu) it
shall pass an iommufd object id in the vfio-ap device options:
-object iommufd,id=iommufd0
-device vfio-ap,sysfsdev=/sys/bus/mdev/devices/XXX,iommufd=iommufd0
Suggested-by: Alex Williamson <alex.william...@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
---
hw/vfio/ap.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index bbf69ff55a..80629609ae 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -11,10 +11,12 @@
*/
#include "qemu/osdep.h"
+#include CONFIG_DEVICES /* CONFIG_IOMMUFD */
#include <linux/vfio.h>
#include <sys/ioctl.h>
#include "qapi/error.h"
#include "hw/vfio/vfio-common.h"
+#include "sysemu/iommufd.h"
#include "hw/s390x/ap-device.h"
#include "qemu/error-report.h"
#include "qemu/event_notifier.h"
@@ -204,6 +206,10 @@ static void vfio_ap_unrealize(DeviceState *dev)
static Property vfio_ap_properties[] = {
DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
+#ifdef CONFIG_IOMMUFD
+ DEFINE_PROP_LINK("iommufd", VFIOAPDevice, vdev.iommufd,
+ TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *),
+#endif
DEFINE_PROP_END_OF_LIST(),
};
--
2.34.1
