[libvirt] Problem with fullyvirtualized guest direct kernel boot

[Daniel P. Berrange]

On Wed, Nov 05, 2008 at 09:28:16PM +0300, Max Martynov wrote:
> Hi All,
> 
> I am trying to use fullyvirtualized guest direct kernel boot, but all I see
> is the following error:
> libvir: Xen Daemon error : POST operation failed: (xend.err 'Error creating
> domain: (2, \'Invalid kernel\', "elf_xen_note_check: ERROR: Not a Xen-ELF
> image: No ELF notes or \'__xen_guest\' section found.\\n")')
> 
> Kernel, initrd and root file system are extracted from working Fedora 9 disk
> image without any additional tinkering. Guest Fedora is clean and was
> installed from scratch. When I use this whole disk image with
> fullyvirtualized guest BIOS boot with, everything works fine. I also tried
> paravirtualized guest bootloader with another linux kernel and it also works
> fine. Xen version is 3.2.1-rc1-pre. Host OS is Ubuntu Hardy.

That Xen is too probably old - you need 3.3.x or newer. The Xen 3.2 in
Fedora has a backport of this functionality, and I doubt the Ubuntu xen
has copied that.

> Here is the libvirt config for direct kernel boot:
> <domain type='xen' id='18'>
>     <name>test1</name>
>     <uuid>4dea22b31d52d8f32516782e98ab3fa0</uuid>
>     <os>
>         <type>linux</type>

This tag is telling Xen todo a paravirt guest, but you say you want
a fullvirt one, so replace this with

        <type>hvm</type>

>         <loader>/usr/lib/xen/boot/hvmloader</loader>
>         <kernel>/tmp/vmlinuz-2.6.25-14.fc9.i686</kernel>
>         <initrd>/tmp/initrd-2.6.25-14.fc9.i686.img</initrd>
>         <root>/dev/sda1</root>
>         <cmdline>ro</cmdline>
>     </os>
>     <memory>524288</memory>
>     <vcpu>1</vcpu>
>     <devices>
>         <emulator>/usr/lib/xen/bin/qemu-dm</emulator>
>         <disk type='file'>
>             <driver name="tap" type="aio"/>
>             <source file='/tmp/f9_disassembled/root.img'/>
>             <target dev='sda1'/>
>         </disk>
>         <disk type='file'>
>             <driver name="tap" type="aio"/>
>             <source file='/tmp/swap'/>
>             <target dev='sda3'/>
>         </disk>
>         <interface type='bridge'>
>             <source bridge='eth0'/>
>             <mac address='00:16:3e:5d:c7:9e'/>
>             <script path='/etc/xen/scripts/vif-bridge'/>
>         </interface>
>         <graphics type='vnc' port='5904'/>
>     </devices>
> </domain>
> 
> 

Daniel
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