Hi Zhenzhong,
On 11/14/23 11:09, Zhenzhong Duan wrote:
> 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.william...@redhat.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
Reviewed-by: Eric Auger <eric.au...@redhat.com>
Eric
> ---
> v6: Move #include "sysemu/iommufd.h" in platform.c
>
> hw/vfio/platform.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> 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(),
> };
>
