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authorChris Wright <chrisw@sous-sol.org>2008-11-25 21:17:13 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-01-07 11:12:38 -0800
commitc70e0d9dfef3d826c8ae4f7544acc53887cb161d (patch)
treee870ac2759edc8dbb2dc67b18c0c42e827283fc7
parent2debb4d2019fa05a0896f1591dea0e0dc21bc046 (diff)
PCI: pci-stub module to reserve pci device
When doing device assignment with KVM there's currently nothing to protect the device from having a driver in the host as well as the guest. This trivial module just binds the pci device on the host to a stub driver so that a real host driver can't bind to the device. It has no pci id table, it supports only dynamic ids. # 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 lrwxrwxrwx 1 root root 0 2008-11-25 19:10 /sys/bus/pci/devices/0000:00:19.0/driver -> ../../../bus/pci/drivers/pci-stub Cc: "Kay, Allen M" <allen.m.kay@intel.com> Cc: "Nakajima, Jun" <jun.nakajima@intel.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--drivers/pci/Kconfig9
-rw-r--r--drivers/pci/Makefile2
-rw-r--r--drivers/pci/pci-stub.c47
3 files changed, 58 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index e1ca42591ac..2a4501dd251 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 af3bfe22847..3d07ce24f6a 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 00000000000..74fbec0bf6c
--- /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>");