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XPCI(4)			 BSD Kernel Interfaces Manual		       XPCI(4)

NAME
     xpci — Xen frontend paravirtualized PCI pass-through driver

SYNOPSIS
     xpci* at xenbus?
     pci* at xpci?

DESCRIPTION
     The xpci driver is the frontend part of the PCI pass-through functional‐
     ity that can be used by Xen guest domains to communicate with PCI
     devices.

     From a guest point of view, xpci is similar to a pci(4) bus, except that
     the guest talks with the PCI backend driver instead of the real physical
     device directly.

     When the host domain is NetBSD, the xpci driver is backed by a pciback(4)
     driver within the dom0.

SEE ALSO
     pci(4), pciback(4), xenbus(4)

HISTORY
     The xpci driver first appeared in NetBSD 5.1.

AUTHORS
     The xpci driver was written by Manuel Bouyer ⟨bouyer@NetBSD.org⟩.

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

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