kernel/Documentation/ABI/testing/sysfs-driver-pciback

   1 What:           /sys/bus/pci/drivers/pciback/quirks
   2 Date:           Oct 2011
   3 KernelVersion:  3.1
   4 Contact:        xen-devel@lists.xenproject.org
   5 Description:
   6                 If the permissive attribute is set, then writing a string in
   7                 the format of DDDD:BB:DD.F-REG:SIZE:MASK will allow the guest
   8                 to write and read from the PCI device. That is Domain:Bus:
   9                 Device.Function-Register:Size:Mask (Domain is optional).
  10                 For example:
  11                 #echo 00:19.0-E0:2:FF > /sys/bus/pci/drivers/pciback/quirks
  12                 will allow the guest to read and write to the configuration
  13                 register 0x0E.