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NetBSD 6.1.5 - man page for pciback (netbsd section 4)

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PCIBACK(4)			   BSD Kernel Interfaces Manual 		       PCIBACK(4)

     pciback -- Xen backend paravirtualized PCI pass-through driver

     pciback* at pci?

     The pciback driver is the backend part of the PCI pass-through functionality 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 pciback.hide parameter:
		See also boot(8).
	   3.	reboot dom0.
	   4.	add the PCI ID to the list of PCI devices in the domain configuration file:
		      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 arbitrary 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 memory portions, via DMA.

BSD					 January 8, 2011				      BSD
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