XPCI(4) FreeBSD Kernel Interfaces Manual (xen) 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
functionality 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 <
[email protected]>.
SECURITY CONSIDERATIONS
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.
FreeBSD 14.1-RELEASE-p8 January 8, 2011 FreeBSD 14.1-RELEASE-p8