PCI_FIND_BUS(9) Hardware Interfaces PCI_FIND_BUS(9)NAME
pci_find_bus - locate PCI bus from a given domain and bus number
struct pci_bus * pci_find_bus(int domain, int busnr);
number of PCI domain to search
number of desired PCI bus
Given a PCI bus number and domain number, the desired PCI bus is located in the global list of PCI buses. If the bus is found, a pointer to
its data structure is returned. If no bus is found, NULL is returned.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 PCI_FIND_BUS(9)
Check Out this Related Man Page
PCIBACK(4) BSD/xen Kernel Interfaces Manual PCIBACK(4)NAME
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.
SEE ALSO pci(4), xpci(4), boot(8), pcictl(8)HISTORY
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 physi-
cal memory portions, via DMA.
BSD January 8, 2011 BSD
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