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xpci(4) [netbsd man page]

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

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 <>. 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 physi- cal memory portions, via DMA. BSD
January 8, 2011 BSD

Check Out this Related Man Page

XBDBACK(4)						 BSD/xen Kernel Interfaces Manual						XBDBACK(4)

xbdback -- Xen backend paravirtualized block device interface SYNOPSIS
pseudo-device xbdback DESCRIPTION
The xbdback interface forms the backend part of the paravirtualized drivers used by Xen domains to offer a block device interface, similar to a hard disk. xbdback interfaces are backed either by a physical device directly, or an image file mounted through vnd(4). All xbdback interfaces follow the ``xbdbackXiY'' naming convention, where 'X' represents the guest domain identifier, and 'Y' an arbitrary identifier. This identifier is usually associated to the device node as seen by the guest using major(3) and minor(3) numbers. For example, identifier ``769'' (0x301) means major 3 and minor 1, identified as ``hda1'' under Linux convention. For NetBSD, the guest device name spec- ified in the guest configuration file does not matter, and can be chosen arbitrarily. A xbdback interface will appear as a xbd(4) block device inside a NetBSD guest domain. In the XenStore, xbd and xbdback are identified by ``vbd'' (virtual block device) entries. DIAGNOSTICS
xbd backend: attach device %s (size %d) for domain %d Gives the device used as xbdback interface for the given guest domain, and its size, in bytes. xbd backend 0x%x for domain %d using event channel %d, protocol %s Gives the backend identifier, guest domain ID, event channel ID, and pro- tocol used for block level communication. xbdback %s: can't VOP_OPEN device 0x%x: %d When this message appears in the system message buffer with error 16 (EBUSY), the device is likely to be already mounted. It must be unmounted first, as the system will refuse to open it a second time. SEE ALSO
vnd(4), xbd(4), xenbus(4) HISTORY
The xbdback driver first appeared in NetBSD 4.0. AUTHORS
The xbdback driver was written by Manuel Bouyer <>. BSD
June 7, 2011 BSD
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