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[Xen-users] Nested Xen hypervisor installation problems

  • To: xen-users@xxxxxxxxxxxxx
  • From: "David A. Van Arnem" <dvanarnem@xxxxxxxxx>
  • Date: Mon, 07 Jul 2014 13:13:53 -0600
  • Delivery-date: Mon, 07 Jul 2014 19:14:39 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>


I'm working on setting up a nested Xen hypervisor and I'm having difficulty, and I'm hoping someone can help.

I am using the current version of Xen in the Fedora 20 repositories (4.3.2-6). I've been able to successfully set up the L0 dom0, and install an HVM L1 domU using virt-install (both are using Fedora 20). My virt-install command was:

virt-install --hvm --name <domU name> --ram 4096 --vcpus 2 -f /dev/fedora/<lv name> --network bridge=virbr0 --cdrom <path to Fedora 20 live iso> --livecd

Without the hypervisor, L1 acts fine -- I can connect to the network through L0 using the bridge, I can vnc to the desktop, and xl info shows virt_caps as hvm. However, once I install Xen through yum (again 4.3.2-6) and reboot with the hypervisor, L1 "works" (i.e. boots) but I lose some functionality. First, the desktop no longer starts, I lose networking, and virt_caps in xl info is blank. I can still do a command line login using virt-viewer.

I'm new to virtualization with Xen, so I believe my problem may be due to missing some key step(s) during the installation of L1. So, here are my questions:

1. Can L1 be installed correctly for use with a nested hypervisor using virt-install, or do I need to use xl directly? If so, what do I need to be aware of when installing?

2. I see from the Xen wiki that nested virtualization requires a couple extra parameters to the config file (hap=1 and nestedhvm=1). Is it possible to specify these options with virt-install, since it doesn't seem to use the config files that xl does?

3.  Can I expect to get the desktop and networking in a L1 hypervisor setup?

4.  Do I need Xen 4.4 or should Xen 4.3.2-6 work?

I am using an Intel CPU with virtualization support, so I believe this should be possible for me. Please let me know what other information I need to provide, and thanks in advance!


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