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author | Chris Wright <chrisw@sous-sol.org> | 2008-11-25 21:17:13 -0800 |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-01-07 11:12:38 -0800 |
commit | c70e0d9dfef3d826c8ae4f7544acc53887cb161d (patch) | |
tree | e870ac2759edc8dbb2dc67b18c0c42e827283fc7 /drivers/pci | |
parent | 2debb4d2019fa05a0896f1591dea0e0dc21bc046 (diff) | |
download | blackbird-op-linux-c70e0d9dfef3d826c8ae4f7544acc53887cb161d.tar.gz blackbird-op-linux-c70e0d9dfef3d826c8ae4f7544acc53887cb161d.zip |
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r-- | drivers/pci/Kconfig | 9 | ||||
-rw-r--r-- | drivers/pci/Makefile | 2 | ||||
-rw-r--r-- | drivers/pci/pci-stub.c | 47 |
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>"); |