Commit 80c7e8cc authored by Alex Williamson's avatar Alex Williamson
Browse files

vfio-pci: Allow PCI IDs to be specified as module options

This copies the same support from pci-stub for exactly the same
purpose, enabling a set of PCI IDs to be automatically added to the
driver's dynamic ID table at module load time.  The code here is
pretty simple and both vfio-pci and pci-stub are fairly unique in
being meta drivers, capable of attaching to any device, so there's no
attempt made to generalize the code into pci-core.

Signed-off-by: default avatarAlex Williamson <>
parent ecaa1f6a
......@@ -11,6 +11,8 @@
* Author: Tom Lyon,
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/eventfd.h>
#include <linux/file.h>
......@@ -33,6 +35,10 @@
#define DRIVER_AUTHOR "Alex Williamson <>"
#define DRIVER_DESC "VFIO PCI - User Level meta-driver"
static char ids[1024] __initdata;
module_param_string(ids, ids, sizeof(ids), 0);
MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");
static bool nointxmask;
module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
......@@ -1105,6 +1111,47 @@ static void __exit vfio_pci_cleanup(void)
static void __init vfio_pci_fill_ids(void)
char *p, *id;
int rc;
/* no ids passed actually */
if (ids[0] == '\0')
/* add ids specified in the module parameter */
p = ids;
while ((id = strsep(&p, ","))) {
unsigned int vendor, device, subvendor = PCI_ANY_ID,
subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
int fields;
if (!strlen(id))
fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
&vendor, &device, &subvendor, &subdevice,
&class, &class_mask);
if (fields < 2) {
pr_warn("invalid id string \"%s\"\n", id);
rc = pci_add_dynid(&vfio_pci_driver, vendor, device,
subvendor, subdevice, class, class_mask, 0);
if (rc)
pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n",
vendor, device, subvendor, subdevice,
class, class_mask, rc);
pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n",
vendor, device, subvendor, subdevice,
class, class_mask);
static int __init vfio_pci_init(void)
int ret;
......@@ -1119,6 +1166,8 @@ static int __init vfio_pci_init(void)
if (ret)
goto out_driver;
return 0;
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