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1What: /sys/bus/pci/drivers/pciback/quirks2Date: Oct 20113KernelVersion: 3.14Contact: xen-devel@lists.xenproject.org5Description:6 If the permissive attribute is set, then writing a string in7 the format of DDDD:BB:DD.F-REG:SIZE:MASK will allow the guest8 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 12 #echo 00:19.0-E0:2:FF > /sys/bus/pci/drivers/pciback/quirks13 14 will allow the guest to read and write to the configuration15 register 0x0E.16 17What: /sys/bus/pci/drivers/pciback/allow_interrupt_control18Date: Jan 202019KernelVersion: 5.620Contact: xen-devel@lists.xenproject.org21Description:22 List of devices which can have interrupt control flag (INTx,23 MSI, MSI-X) set by a connected guest. It is meant to be set24 only when the guest is a stubdomain hosting device model (qemu)25 and the actual device is assigned to a HVM. It is not safe26 (similar to permissive attribute) to set for a devices assigned27 to a PV guest. The device is automatically removed from this28 list when the connected pcifront terminates.29