bus/pci: enhance hotplug for VFIO bound devices

VFIO modules may get loaded/initialized after DPDK initialized (like when starting an application without knowing which devices will be used, and whether their drivers require VFIO). Retry enabling VFIO if not available. This way, it is not required to restart the DPDK application anymore. Signed-off-by: David Marchand <[email protected]> Reviewed-by: Maxime Coquelin <[email protected]>
david-marchand · Oct 14, 2024 · 5f7b981 · 5f7b981
1 parent 6e18a2d
commit 5f7b981
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
@@ -1319,6 +1319,12 @@ pci_vfio_mmio_write(const struct rte_pci_device *dev, int bar,
 int
 pci_vfio_is_enabled(void)
 {
-	return rte_vfio_is_enabled("vfio_pci");
+	int status = rte_vfio_is_enabled("vfio_pci");
+
+	if (!status) {
+		rte_vfio_enable("vfio");
+		status = rte_vfio_is_enabled("vfio_pci");
+	}
+	return status;
 }
 #endif