Hello,
I tried to install "Microsoft Windows 2008 Server R2" on an Amd64 host using
Xen-3.4.3. The installation aborted with the following error message:
> Windows Boot Mager
...
> File: \windows\system32\boot\winload.exe
> Status: 0xc000035a
> Info: Attempting to load a 64-bit application, however this CPU is not
compatible with 64-bit mode.
For testing I converted the libvirt-XML file to an Xen-Xm file using "virsh
domxml-to-native" and started that file with "xm create", which worked.
Comparing the output of "xm list -a" of the broken libvirt- and the working
xm-configuration I found several differences, especially with "pae":
Using "xm create" pae is set to 1, while with libvirt pae is set to 0. After
adding the /domain/featues/pae node to libvirts XML domain file, Windows
installed fine.
Looking at "virsh capabilities" I get the following (abbreviated) output:
> <capabilities>
> <guest>
> <os_type>hvm</os_type>
> <arch name='i686'>
> <wordsize>32</wordsize>
...
> </arch>
> <features>
> <pae/>
> <nonpae/>
> <acpi default='on' toggle='yes'/>
> <apic default='on' toggle='yes'/>
> </features>
> </guest>
> <guest>
> <os_type>hvm</os_type>
> <arch name='x86_64'>
> <wordsize>64</wordsize>
...
> </arch>
> <features>
> <acpi default='on' toggle='yes'/>
> <apic default='on' toggle='yes'/>
> </features>
> </guest>
> </capabilities>
As you can see, neither "<pae/>" nor "<nopae/>" is listed for for the 64 bit
Xen-Fv domain type, which makes it hard to automatically create a correct
_and_ _working_ XML file for Xen-Fv-64 bit domains
Looking at "/sys/hypervisor/properties/capabilities" I find the following
capabilities reported by Xen
> xen-3.0-x86_64
> xen-3.0-x86_32p
> hvm-3.0-x86_32
> hvm-3.0-x86_32p
> hvm-3.0-x86_64
There's also no "hvm-3.0-x86_64p" which makes me wonder, if "<pae/>" is the
default for Xen-64 bit domains.
If that is true, should libvirt add "<pae/"> by default to the capabilities
report, or should libvirt silently pass "(pae 1)" when pushing the XML domain
description to Xend? Lookign at
<file:xen-3.4.3/tools/python/xen/xm/create.py>:210 I see that "pae" is
enabled by default there, and thus gets enabled for each domain using "xm
create":
> gopts.var('pae', val='PAE',
> fn=set_int, default=1,
> use="Disable or enable PAE of HVM domain.")
Any feedback is appreciated.
BYtE
Philipp
--
Philipp Hahn Open Source Software Engineer hahn@xxxxxxxxxxxxx
Univention GmbH Linux for Your Business fon: +49 421 22 232- 0
Mary-Somerville-Str.1 28359 Bremen fax: +49 421 22 232-99
http://www.univention.de
<domain type='xen'>
<name>Windows2008r2_64</name>
<memory>524288</memory>
<vcpu>1</vcpu>
<os>
<type arch='x86_64' machine='xenfv'>hvm</type>
<loader>/usr/lib/xen/boot/hvmloader</loader>
<boot dev='cdrom'/>
</os>
<features>
<acpi/>
<apic/>
<!--pae/-->
</features>
<clock offset='utc'/>
<on_poweroff>preserve</on_poweroff>
<on_reboot>preserve</on_reboot>
<on_crash>preserve</on_crash>
<devices>
<emulator>/usr/lib/xen/bin/qemu-dm</emulator>
<disk type='file' device='disk'>
<driver name='file'/>
<source file='/var/lib/libvirt/images/w2k8r2_64.img'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='file'/>
<source file='/var/lib/libvirt/images/windows2008-server-R2_x64.iso'/>
<readonly/>
</disk>
<interface type='bridge'>
<mac address='00:00:00:00:00:00'/>
<source bridge='eth0'/>
</interface>
<input type='tablet' bus='usb'/>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0' keymap='de'/>
</devices>
</domain>
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