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vfio/ap: Allow the selection of a given iommu backend 

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.williamson@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Zhenzhong Duan 2023-11-21 16:44:13 +08:00 committed by Cédric Le Goater
parent 3016e60f8f
commit 336f308958
1 changed files with 6 additions and 0 deletions
hw/vfio
ap.c

6
hw/vfio/ap.c
View File

@ -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(),
};