Difference between revisions of "Xen FAQ Booting"

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<!-- Original date: Wed Sep 14 11:36:18 2011 (1316000178000000) -->
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= Booting Xen =
== How do I hide a pci device from dom0? ==
In Xen 2.x, you can add the <code><nowiki>physdev_dom0_hide</nowiki></code> parameter (see [[Xen Hypervisor Boot Options]] for more parameters) to hide one or more pci devices to Dom0, so you can affect them to domU.
Pci slots MUST be formatted like this:
* '''(nn:nn.n)'''
* <code><nowiki>(03:06.1)</nowiki></code> is correct
* <code><nowiki>(03:6.1)</nowiki></code> is NOT correct
You can get the pci bus address on a Linux system by using the lspci command (only the last bits are relevant):
lspci | grep Ethernet
0000:02:03.0 Ethernet controller: Intel Corp. 82546EB Gigabit Ethernet Controller (Copper) (rev 01)
0000:02:03.1 Ethernet controller: Intel Corp. 82546EB Gigabit Ethernet Controller (Copper) (rev 01)
* to hide the second network interface from dom0, you can then append <code><nowiki>physdev_dom0_hide=(02:03.1)</nowiki></code> to your <code><nowiki>kernel /boot/xen-2.0.gz</nowiki></code>.
* to hide multiple pci devices, simply concatenate all the pci slots address like this: <code><nowiki>physdev_dom0_hide=(02:03.0)(02:03.1)</nowiki></code>
If everything went ok, you should see the following lines after a reboot:
(XEN) Hiding PCI device 02:03.0 from DOM0
(XEN) Hiding PCI device 02:03.1 from DOM0
== Error about root device still mounted when it's not mounted, zombie domU that can't be killed, domU hangs under heavy I/O (e.g disk) access ==
This is an unresolved problem with Xen 3.0.
You may try to [http://lists.xensource.com/archives/html/xen-users/2006-03/msg00651.html pass nousb to dom0 kernel command line], or [http://lists.xensource.com/archives/html/xen-devel/2005-07/msg00436.html pass ignorebiostables], or try to [http://lists.xensource.com/archives/html/xen-devel/2005-07/msg00468.html disable software IRQ affinity for 1850/2850 systems].
* [http://lists.xensource.com/archives/html/xen-users/2006-02/msg00851.html Discussion in xen-users mailing list]

Revision as of 13:46, 24 September 2012