162306a36Sopenharmony_ciWhat:           /sys/bus/pci/drivers/pciback/quirks
262306a36Sopenharmony_ciDate:           Oct 2011
362306a36Sopenharmony_ciKernelVersion:  3.1
462306a36Sopenharmony_ciContact:        xen-devel@lists.xenproject.org
562306a36Sopenharmony_ciDescription:
662306a36Sopenharmony_ci                If the permissive attribute is set, then writing a string in
762306a36Sopenharmony_ci                the format of DDDD:BB:DD.F-REG:SIZE:MASK will allow the guest
862306a36Sopenharmony_ci                to write and read from the PCI device. That is Domain:Bus:
962306a36Sopenharmony_ci                Device.Function-Register:Size:Mask (Domain is optional).
1062306a36Sopenharmony_ci                For example::
1162306a36Sopenharmony_ci
1262306a36Sopenharmony_ci                  #echo 00:19.0-E0:2:FF > /sys/bus/pci/drivers/pciback/quirks
1362306a36Sopenharmony_ci
1462306a36Sopenharmony_ci                will allow the guest to read and write to the configuration
1562306a36Sopenharmony_ci                register 0x0E.
1662306a36Sopenharmony_ci
1762306a36Sopenharmony_ciWhat:           /sys/bus/pci/drivers/pciback/allow_interrupt_control
1862306a36Sopenharmony_ciDate:           Jan 2020
1962306a36Sopenharmony_ciKernelVersion:  5.6
2062306a36Sopenharmony_ciContact:        xen-devel@lists.xenproject.org
2162306a36Sopenharmony_ciDescription:
2262306a36Sopenharmony_ci                List of devices which can have interrupt control flag (INTx,
2362306a36Sopenharmony_ci                MSI, MSI-X) set by a connected guest. It is meant to be set
2462306a36Sopenharmony_ci                only when the guest is a stubdomain hosting device model (qemu)
2562306a36Sopenharmony_ci                and the actual device is assigned to a HVM. It is not safe
2662306a36Sopenharmony_ci                (similar to permissive attribute) to set for a devices assigned
2762306a36Sopenharmony_ci                to a PV guest. The device is automatically removed from this
2862306a36Sopenharmony_ci                list when the connected pcifront terminates.
29