linux-kernel - [PATCH 2/2] PCI: pci-stub module to reserve pci device

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Date:	Tue, 25 Nov 2008 19:38:39 -0800
From:	Chris Wright <chrisw@...s-sol.org>
To:	jbarnes@...tuousgeek.org
Cc:	greg@...ah.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	allen.m.kay@...el.com, jun.nakajima@...el.com
Subject: [PATCH 2/2] 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@...el.com>
Cc: "Nakajima, Jun" <jun.nakajima@...el.com>
Signed-off-by: Chris Wright <chrisw@...s-sol.org>
---
 drivers/pci/Kconfig    |    9 +++++++++
 drivers/pci/Makefile   |    2 ++
 drivers/pci/pci-stub.c |   38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 0 deletions(-)
 create mode 100644 drivers/pci/pci-stub.c

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index e1ca425..f6183df 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.
+
+	  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 af3bfe2..3d07ce2 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 0000000..8b19df6
--- /dev/null
+++ b/drivers/pci/pci-stub.c
@@ -0,0 +1,38 @@
+/* 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.
+ */
+
+#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@...s-sol.org>");
-- 
1.6.0.3

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