1What: /sys/bus/pci/drivers/pciback/quirks 2Date: Oct 2011 3KernelVersion: 3.1 4Contact: xen-devel@lists.xenproject.org 5Description: 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. 14