mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 20:10:50 +07:00
c70e0d9dfe
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>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/* 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>");
|