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