diff mbox series

[v7,12/27] vfio/platform: Allow the selection of a given iommu backend

Message ID 20231121084426.1286987-13-zhenzhong.duan@intel.com (mailing list archive)
State New, archived
Headers show
Series vfio: Adopt iommufd | expand

Commit Message

Duan, Zhenzhong Nov. 21, 2023, 8:44 a.m. UTC 
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-platform device:

If the user wants to use the legacy backend, it shall not
link the vfio-platform device with any iommufd object:

 -device vfio-platform,host=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-platform device options:

 -object iommufd,id=iommufd0
 -device vfio-platform,host=XXX,iommufd=iommufd0

Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
---
 hw/vfio/platform.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index 8e3d4ac458..98ae4bc655 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -15,11 +15,13 @@ 
  */
 
 #include "qemu/osdep.h"
+#include CONFIG_DEVICES /* CONFIG_IOMMUFD */
 #include "qapi/error.h"
 #include <sys/ioctl.h>
 #include <linux/vfio.h>
 
 #include "hw/vfio/vfio-platform.h"
+#include "sysemu/iommufd.h"
 #include "migration/vmstate.h"
 #include "qemu/error-report.h"
 #include "qemu/lockable.h"
@@ -649,6 +651,10 @@  static Property vfio_platform_dev_properties[] = {
     DEFINE_PROP_UINT32("mmap-timeout-ms", VFIOPlatformDevice,
                        mmap_timeout, 1100),
     DEFINE_PROP_BOOL("x-irqfd", VFIOPlatformDevice, irqfd_allowed, true),
+#ifdef CONFIG_IOMMUFD
+    DEFINE_PROP_LINK("iommufd", VFIOPlatformDevice, vbasedev.iommufd,
+                     TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *),
+#endif
     DEFINE_PROP_END_OF_LIST(),
 };