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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>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* pci-stub - simple stub driver to reserve a pci device
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*
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* Copyright (C) 2008 Red Hat, Inc.
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* Author:
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* Chris Wright
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*
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* Usage is simple, allocate a new id to the stub driver and bind the
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* device to it. For example:
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*
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* # echo "8086 10f5" > /sys/bus/pci/drivers/pci-stub/new_id
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* # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
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* # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/pci-stub/bind
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* # ls -l /sys/bus/pci/devices/0000:00:19.0/driver
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* .../0000:00:19.0/driver -> ../../../bus/pci/drivers/pci-stub
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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static int pci_stub_probe(struct pci_dev *dev, const struct pci_device_id *id)
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{
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return 0;
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}
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static struct pci_driver stub_driver = {
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.name = "pci-stub",
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.id_table = NULL, /* only dynamic id's */
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.probe = pci_stub_probe,
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};
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static int __init pci_stub_init(void)
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{
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return pci_register_driver(&stub_driver);
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}
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static void __exit pci_stub_exit(void)
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{
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pci_unregister_driver(&stub_driver);
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}
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module_init(pci_stub_init);
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module_exit(pci_stub_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Chris Wright <chrisw@sous-sol.org>");
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