[PATCH 2/4] vfio: add VFIO IOMMUFD support

[Stephen Hemminger]

On Fri, 22 Dec 2023 19:44:51 +0000
beilei.xing at intel.com wrote:

> diff --git a/lib/eal/include/rte_vfio.h b/lib/eal/include/rte_vfio.h
> index 22832afd0f..7a9b26b0f7 100644
> --- a/lib/eal/include/rte_vfio.h
> +++ b/lib/eal/include/rte_vfio.h
> @@ -17,6 +17,8 @@ extern "C" {
>  #include <stdbool.h>
>  #include <stdint.h>
>  
> +#include <rte_compat.h>
> +
>  /*
>   * determine if VFIO is present on the system
>   */
> @@ -28,6 +30,9 @@ extern "C" {
>  #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
>  #define HAVE_VFIO_DEV_REQ_INTERFACE
>  #endif /* kernel version >= 4.0.0 */
> +#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 6, 0)
> +#define VFIO_IOMMUFD_PRESENT
> +#endif /* kernel version >= 6.6.0 */
>  #endif /* RTE_EAL_VFIO */

Depending on kernel version macro is a mistake because many enterprise
distro's backport features and do not change kernel version.
Also, it means the build and target machine have to be same kernel version.