doc: clarify SRIOV activation with built-in VFIO

Currently, the documentation only contains instructions for enabling
SRIOV support for VFIO compiled as a module, but doesn't have any
instructions on how to do the same for cases where VFIO is built-in.
Add these instructions.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>

diff --git a/doc/guides/linux_gsg/linux_drivers.rst b/doc/guides/linux_gsg/linux_drivers.rst
index c6b6881..2dd711b 100644 (file)
--- a/doc/guides/linux_gsg/linux_drivers.rst
+++ b/doc/guides/linux_gsg/linux_drivers.rst
@@ -65,6 +65,12 @@ The token will be used for all PF and VF ports within the application.
 
       sudo modprobe vfio-pci enable_sriov=1
 
+   Alternatively, pass the ``enable_sriov`` parameter through the ``sysfs`` if the module is already loaded or is built-in:
+
+   .. code-block:: console
+
+      echo 1 | sudo tee /sys/module/vfio_pci/parameters/enable_sriov
+
 #. Bind the PCI devices to ``vfio-pci`` driver
 
    .. code-block:: console