Xen FAQ Booting: Difference between revisions
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== I have problems getting Xen or dom0 kernel to boot, how can I set up a serial console to log and troubleshoot the boot process? == |
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See the [[XenSerialConsole]] wiki page. |
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<!-- Original date: Wed Sep 14 11:36:18 2011 (1316000178000000) --> |
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== I am booting my new EFI-based system. I se "Loading ramdisk..." and then it stops == |
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Go into your BIOS and enable Legacy Booting (non-EFI). If it still doesn't work, upgrade the BIOS to its latest version. |
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= Booting Xen = |
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== Where do I find more Booting FAQs? == |
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== I get an error from Xen... (console output starting "(XEN)") == |
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See [[Xen_Common_Problems#Booting]] |
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<pre><nowiki> |
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(XEN) Initial guest OS requires too much space |
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(XEN) (8MB is greater than 0MB limit) |
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</nowiki></pre> |
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Check that you are correctly specifying the <code><nowiki>dom0_mem</nowiki></code> command line option for starting Xen. Note that: <code><nowiki>dom0_mem=512M</nowiki></code> should work in recent versions while older versions such as 2.0.5 require the memory specification to be in kilobytes, e.g. <code><nowiki>dom0_mem=524288</nowiki></code>. |
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(Note: you need to leave some memory for Xen, so the above assumes you have more than 512M total in the system; if you still have problems, reduce the amount further). |
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== How do I hide a pci device from dom0? == |
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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. |
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Pci slots MUST be formatted like this: |
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* '''(nn:nn.n)''' |
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so |
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* <code><nowiki>(03:06.1)</nowiki></code> is correct |
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* <code><nowiki>(03:6.1)</nowiki></code> is NOT correct |
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You can get the pci bus address on a Linux system by using the lspci command (only the last bits are relevant): |
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<pre><nowiki> |
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lspci | grep Ethernet |
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0000:02:03.0 Ethernet controller: Intel Corp. 82546EB Gigabit Ethernet Controller (Copper) (rev 01) |
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0000:02:03.1 Ethernet controller: Intel Corp. 82546EB Gigabit Ethernet Controller (Copper) (rev 01) |
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</nowiki></pre> |
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Then: |
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* 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>. |
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* 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> |
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If everything went ok, you should see the following lines after a reboot: |
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<pre><nowiki> |
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(XEN) Hiding PCI device 02:03.0 from DOM0 |
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(XEN) Hiding PCI device 02:03.1 from DOM0 |
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</nowiki></pre> |
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== 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 == |
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This is an unresolved problem with Xen 3.0. |
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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]. |
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* [http://lists.xensource.com/archives/html/xen-users/2006-02/msg00851.html Discussion in xen-users mailing list] |
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[[Category:Xen]] |
[[Category:Xen]] |
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Latest revision as of 01:20, 8 October 2014
I have problems getting Xen or dom0 kernel to boot, how can I set up a serial console to log and troubleshoot the boot process?
See the XenSerialConsole wiki page.
I am booting my new EFI-based system. I se "Loading ramdisk..." and then it stops
Go into your BIOS and enable Legacy Booting (non-EFI). If it still doesn't work, upgrade the BIOS to its latest version.
