vfio: expand non-viable group error message

"VFIO group is not viable" error message is correct
but not very user friendly for something which can
usually be easily rectified.

Add some additional text to give more of a hint.

Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
Reviewed-by: Rami Rosen <ramirose@gmail.com>

diff --git a/lib/librte_eal/linux/eal/eal_vfio.c b/lib/librte_eal/linux/eal/eal_vfio.c
index 19e70bb..6892a2c 100644 (file)
--- a/lib/librte_eal/linux/eal/eal_vfio.c
+++ b/lib/librte_eal/linux/eal/eal_vfio.c
@@ -685,7 +685,9 @@ rte_vfio_setup_device(const char *sysfs_base, const char *dev_addr,
                rte_vfio_clear_group(vfio_group_fd);
                return -1;
        } else if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
-               RTE_LOG(ERR, EAL, "  %s VFIO group is not viable!\n", dev_addr);
+               RTE_LOG(ERR, EAL, "  %s VFIO group is not viable! "
+                               "Not all devices in IOMMU group bound to VFIO or unbound\n",
+                               dev_addr);
                close(vfio_group_fd);
                rte_vfio_clear_group(vfio_group_fd);
                return -1;