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Re: [Xen-users] how to boot a para-virtulized vm from cdrom after installation

  • To: xen-users@xxxxxxxxxxxxx
  • From: Alexandre Kouznetsov <alk@xxxxxxxxxx>
  • Date: Mon, 08 Oct 2012 11:08:39 -0500
  • Delivery-date: Mon, 08 Oct 2012 16:09:54 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>


El 06/10/12 08:38, jun hu escribió:
how to boot a para-virtulized vm from cdrom after installation?

In short, it does not work that way.

When you decide "where to boot from", it implies there is some piece of code (BIOS, for example) that will look for a bootloader on some device. This is perfectly valid in HVM mode of operation, but not in PV.

In case of Para-Virtualized DomU, the hypervisor itself loads the kernel, specified in the config file. There is no BIOS or bootloader residing in the MBR of a block device. There is no no such thing as "boot device" or "boot order".

You can try this:
1. Hard way. Set up a new, completely new, HVM DomU. Attach your former PV DomU to it and boot form CD.

2. Depends on what you need to achieve over your DomU, it almost certainly possible to be done from Dom0.


Alexandre Kouznetsov

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