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PCIBACK(4) NetBSD/xen Kernel Interfaces Manual PCIBACK(4)
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pciback -- Xen backend paravirtualized PCI pass-through driver
pciback* at pci?
The pciback driver is the backend part of the PCI pass-through function-
ality that can be used by the Xen dom0 to export pci(4) devices to a
guest domain. To export a PCI device to a guest domain, the device has
to be attached to pciback in the dom0.
When the guest domain is NetBSD, the device attached to the pciback
driver will attach to a xpci(4) bus inside the guest domain.
To attach a device to the pciback driver, follow these steps:
1. look for the device PCI ID, via pcictl(8).
2. edit boot.cfg(5) and add the PCI ID to the list of PCI IDs
that you want to attach to pciback, in bus:device.function
notation. The list is passed to dom0 module via the
See also boot(8).
3. reboot dom0.
4. add the PCI ID to the list of PCI devices in the domain con-
pci = ['bus:dev.fun', '...']
5. start the guest domain.
pci(4), xpci(4), boot(8), pcictl(8)
The pciback driver first appeared in NetBSD 5.1.
The pciback driver was written by Manuel Bouyer <bouyer@NetBSD.org>.
Currently, to attach a device to the pciback backend, this procedure has
to be performed at boot(8) time. In the future, it will be possible to
do it without requiring a dom0 reboot.
As PCI passthrough offers the possibility for guest domains to send arbi-
trary PCI commands to a physical device, this has direct impact on the
overall stability and security of the system. For example, in case of
erroneous or malicious commands, the device could overwrite physical mem-
ory portions, via DMA.
NetBSD 9.0 January 8, 2011 NetBSD 9.0
Modified for NetBSD
by Kimmo Suominen