0001 What: /sys/bus/pci/drivers/pciback/quirks
0002 Date: Oct 2011
0003 KernelVersion: 3.1
0004 Contact: xen-devel@lists.xenproject.org
0005 Description:
0006 If the permissive attribute is set, then writing a string in
0007 the format of DDDD:BB:DD.F-REG:SIZE:MASK will allow the guest
0008 to write and read from the PCI device. That is Domain:Bus:
0009 Device.Function-Register:Size:Mask (Domain is optional).
0010 For example::
0011
0012 #echo 00:19.0-E0:2:FF > /sys/bus/pci/drivers/pciback/quirks
0013
0014 will allow the guest to read and write to the configuration
0015 register 0x0E.
0016
0017 What: /sys/bus/pci/drivers/pciback/allow_interrupt_control
0018 Date: Jan 2020
0019 KernelVersion: 5.6
0020 Contact: xen-devel@lists.xenproject.org
0021 Description:
0022 List of devices which can have interrupt control flag (INTx,
0023 MSI, MSI-X) set by a connected guest. It is meant to be set
0024 only when the guest is a stubdomain hosting device model (qemu)
0025 and the actual device is assigned to a HVM. It is not safe
0026 (similar to permissive attribute) to set for a devices assigned
0027 to a PV guest. The device is automatically removed from this
0028 list when the connected pcifront terminates.
