xen discuss - Feb 2010 - Howto convert Solaris 10 DomU from hvm to paravirt?

Is it possible to convert Solaris 10 DomU from hvm to pv??

Dom0 is Opensolaris b132. Possibly any Documentation about this? 

Here is config of Solaris DomU:


<domain type=''xen'' id=''1''>
  <name>Solaris-10</name>
  <uuid>c505f6c3-b37b-8268-fe46-f10b3277238b</uuid>
  <memory>2097152</memory>
  <currentMemory>2097152</currentMemory>
  <vcpu>2</vcpu>
  <os>
    <type>hvm</type>
    <loader>/usr/lib/xen/boot/hvmloader</loader>
    <boot dev=''hd''/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset=''localtime''/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <distro>
    <type>solaris</type>
    <variant>solaris10</variant>
  </distro>
  <devices>
    <emulator>/usr/lib/xen/bin/qemu-dm</emulator>
    <disk type=''block'' device=''disk''>
      <driver name=''phy'' type=''zvol''/>
      <source dev=''/tank/guests/dom4/disk0''/>
      <target dev=''hda'' bus=''ide''/>
    </disk>
    <disk type=''file'' device=''cdrom''>
      <target dev=''hdc'' bus=''ide''/>
      <readonly/>
    </disk>
    <interface type=''ethernet''>
      <mac address=''XX:XX:XX:XX:XX:XX''/>
      <script path=''/usr/lib/xen/scripts/vif-vnic''/>
      <target dev=''vif1.0''/>
    </interface>
    <serial type=''pty''>
      <source path=''/dev/pts/1''/>
      <target port=''0''/>
    </serial>
    <console type=''pty''
tty=''/dev/pts/1''>
      <source path=''/dev/pts/1''/>
      <target port=''0''/>
    </console>
    <input type=''tablet'' bus=''usb''/>
    <input type=''mouse'' bus=''ps2''/>
    <graphics type=''vnc'' port=''5900''
autoport=''yes'' keymap=''en-us''/>
  </devices>
</domain>

Thank you!

I''ve not attempted to do this, but today came across an answer in the
Xen-Users FAQ that fit your question... it may lead you in the right direction:

==Guest Conversion
Q (G1.0):	How do I convert a Centos HVM Guest to a PV Guest? 
A (G1.0):	Creating a Centos HVM domU with working PV drivers :
http://pastebin.com/fb6fe631
Converting HVM guest to PV guest : http://pastebin.com/f6a5022bf

If you follow both parts correctly you should have a working PV domU. If
anything goes wrong during conversion process, you should still be able to boot
the previous HVM domU config if you select the non-xen kernel (second entry)
from grub menu.list.
==

benr.
-- 
This message posted from opensolaris.org

On Thu, Feb 18, 2010 at 3:36 AM, E.S. <a.n.s.i@gmx.net>
wrote:
> Is it possible to convert Solaris 10 DomU from hvm to pv??
AFAIK you can''t run solaris 10 as pv domU. You CAN, however, convert a
HVM opensolaris domU to PV. easily enough.
>
> Dom0 is Opensolaris b132. Possibly any Documentation about this?
This is what I did on RHEL dom0 (should also work on opensolaris dom0):
- create opensolaris HVM domU (I use b132). Complete installation
until you can login to the new installation.
- login as the user you created
- pfexec su - (I prefer this rather than typing "pfexec" everytime)
- beadm create pv (this is the name of new BE. Pick anything you like)
- edit /rpool/boot/grub/menu.lst, edit the new BE entry section to use
xpv kernel so it looks like this

############
kernel$ /platform/i86xpv/kernel/$ISADIR/unix -B $ZFS-BOOTFS,console=graphics
module$ /platform/i86pc/$ISADIR/boot_archive
############

- activate the new BE with "beadm activate pv". This is necessary
because pygrub will use default entry.
- shutdown HVM domU

At this point you can use HVM''s disk directly. In my case I prefer to
create a snapshot and clone.
If you start PV domU now, you''ll get error like this

############
NOTICE: Can not read the pool label from
''/pci@0,0/pci-ide@1,1/ide@0/cmdk@0,0:a''
NOTICE: spa_import_rootpool: error 5
Cannot mount root on /pci@0,0/pci-ide@1,1/ide@0/cmdk@0,0:a fstype zfs

panic[cpu0]/thread=fffffffffbc60520: vfs_mountroot: cannot mount root

fffffffffbc948c0 genunix:vfs_mountroot+32e ()
fffffffffbc948f0 genunix:main+125 ()
fffffffffbc94900 unix:_locore_start+80 ()

skipping system dump - no dump device configured
rebooting...
############

This is because the disk controller has change (from hda to xvda).
You''ll need to import-export the pool first. So we boot using livecd
with a domU config like this (I use old-style config, which should
work on newer version of Xen as well)

############
memory = "2000"
disk =  [
        ''file:/z/iso/osol.iso,xvdc:cdrom,r'',
        ''file:/z/osol-pv/hda.img,xvda,w'',
        ]
vif =   [
        ''mac=00:16:3E:D4:F7:22''
        ]
bootloader="/usr/bin/pygrub"
vcpus=1
############

osol.iso the opensolaris live cd. This will bring you to livecd text console
- login with jack/jack
- pfexec su -
- zpool import -f rpool
- zpool export rpool
- shutdown domU

Then you change domU config a little to put the disk first (or you
could remove the cdrom iso)

############
memory = "2000"
disk =  [
        ''file:/z/osol-pv/hda.img,xvda,w'',
        ''file:/z/iso/osol.iso,xvdc:cdrom,r'',
        ]
vif =   [
        ''mac=00:16:3E:D4:F7:22''
        ]
bootloader="/usr/bin/pygrub"
vcpus=1
############

then boot domU. You''ll get a working PV domU with text console.

-- 
Fajar