3 files changed, 58 insertions, 0 deletions

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index e1ca42591ac4..2a4501dd2515 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -42,6 +42,15 @@ config PCI_DEBUG
 
           When in doubt, say N.
 
+config PCI_STUB
+        tristate "PCI Stub driver"
+        depends on PCI
+        help
+          Say Y or M here if you want be able to reserve a PCI device
+          when it is going to be assigned to a guest operating system.
+
+          When in doubt, say N.
+
 config HT_IRQ
         bool "Interrupts on hypertransport devices"
         default y
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index af3bfe22847b..3d07ce24f6a8 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -53,6 +53,8 @@ obj-$(CONFIG_HOTPLUG) += setup-bus.o
 
 obj-$(CONFIG_PCI_SYSCALL) += syscall.o
 
+obj-$(CONFIG_PCI_STUB) += pci-stub.o
+
 ifeq ($(CONFIG_PCI_DEBUG),y)
 EXTRA_CFLAGS += -DDEBUG
 endif
diff --git a/drivers/pci/pci-stub.c b/drivers/pci/pci-stub.c
new file mode 100644
index 000000000000..74fbec0bf6cb
--- /dev/null
+++ b/drivers/pci/pci-stub.c
@@ -0,0 +1,47 @@
+/* pci-stub - simple stub driver to reserve a pci device
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ * Author:
+ *      Chris Wright
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ *
+ * Usage is simple, allocate a new id to the stub driver and bind the
+ * device to it.  For example:
+ * 
+ * # echo "8086 10f5" > /sys/bus/pci/drivers/pci-stub/new_id
+ * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
+ * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/pci-stub/bind
+ * # ls -l /sys/bus/pci/devices/0000:00:19.0/driver
+ * .../0000:00:19.0/driver -> ../../../bus/pci/drivers/pci-stub
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+
+static int pci_stub_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        return 0;
+}
+
+static struct pci_driver stub_driver = {
+        .name           = "pci-stub",
+        .id_table       = NULL, /* only dynamic id's */
+        .probe          = pci_stub_probe,
+};
+
+static int __init pci_stub_init(void)
+{
+        return pci_register_driver(&stub_driver);
+}
+
+static void __exit pci_stub_exit(void)
+{
+        pci_unregister_driver(&stub_driver);
+}
+
+module_init(pci_stub_init);
+module_exit(pci_stub_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Chris Wright <chrisw@sous-sol.org>");