Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
PCIBACK(4)	       BSD/xen Kernel Interfaces Manual		    PCIBACK(4)

NAME
     pciback --	Xen backend paravirtualized PCI	pass-through driver

SYNOPSIS
     pciback* at pci?

DESCRIPTION
     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.

EXAMPLES
     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 no-
		tation.	 The list is passed to dom0 module via the
		pciback.hide parameter:
		      pciback.hide=(bus:dev.fun)(bus:dev.func)(...)
		See also boot(8).
	   3.	reboot dom0.
	   4.	add the	PCI ID to the list of PCI devices in the domain	con-
		figuration file:
		      pci = ['bus:dev.fun', '...']
	   5.	start the guest	domain.

SEE ALSO
     pci(4), xpci(4), boot(8), pcictl(8)

HISTORY
     The pciback driver	first appeared in NetBSD 5.1.

AUTHORS
     The pciback driver	was written by Manuel Bouyer <bouyer@NetBSD.org>.

CAVEATS
     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.

SECURITY CONSIDERATIONS
     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.

BSD				January	8, 2011				   BSD

NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY | AUTHORS | CAVEATS | SECURITY CONSIDERATIONS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=pciback&sektion=4&manpath=NetBSD+6.0>

home | help