[Xen-users] Where did I go wrong (creating an HVM guest)?

[J <dreadpiratejeff@xxxxxxxxx>]

OK, I'm not "new" to Xen, but it's been a few years (Xen 3.x) since I
last really messed with it.  I'm now stuck trying to get back into my
recently installed new guest.

My host is running Ubuntu 12.04.1 and Xen 4.1 with the xl toolstack.

I originally created/installed the guest using virt-manager.  The
install went well and the guest rebooted successfully and I was able
to access it via

xl vncviewer guest-name

Now, the first problem, where's the config file?  Xen 3.x used fairly
straight forward config files that were stored in /etc/xen/.
virt-install doesn't create that file.

I found an sxp format config file in /var/lib/xend/domains/UUID/ that
matches my guest.  But I'm unable to boot from that.

When I try, I get a lot of parser errors and finally complaints about
it looking like Python code.  So this:

sudo xl create /var/lib/xend/domains/UUID/config.sxp

doesn't allow me to reboot the guest.

I then tried creating a basic old-style config file:

builder='hvm'
name='precise-hvm'
memory=1024
maxmemory=1024
uuid='18069c40-e01f-ddf8-5932-bc6bb6b5bba1'
vif='xenbr0'
disk=[ 'file:/vms/precise-hvm.img,qcow2,hda' ]

I then tried starting the guest there.  That also fails because
despite what I read here:

http://xenbits.xen.org/docs/unstable/misc/xl-disk-configuration.txt

None of these disk lines are accepted by xl:

disk=[ '/vms/precise-hvm.img,,hda' ]
disk=[ '/vms/precise-hvm.img,qcow,hda' ]
disk=[ '/vms/precise-hvm.img,qcow2,hda' ]
disk=[ 'file:/vms/precise-hvm.img,qcow2,hda' ]

For each disk line where I specify a format (qcow or qcow2) I get the
following output:

Parsing config file /etc/xen/precise-hvm.cfg
/etc/xen/precise-hvm.cfg:10: warning: parameter `vif' is a single
value but should be a list
xc: info: VIRTUAL MEMORY ARRANGEMENT:
  Loader:        0000000000100000->000000000017c510
  TOTAL:         0000000000000000->000000003f800000
  ENTRY ADDRESS: 00000000001015a0
xc: info: PHYSICAL MEMORY ALLOCATION:
  4KB PAGES: 0x0000000000000200
  2MB PAGES: 0x00000000000001fb
  1GB PAGES: 0x0000000000000000
libxl: error: libxl.c:938:libxl_device_disk_add Invalid or unsupported
virtual disk identifier qcow2
cannot add disk 0 to domain: -6
libxl: error: libxl_dm.c:747:libxl__destroy_device_model Couldn't find
device model's pid: No such file or directory
libxl: error: libxl.c:730:libxl_domain_destroy
libxl__destroy_device_model failed for 6


and if I DON'T specify a format, I get this:

Parsing config file /etc/xen/precise-hvm.cfg
parse error in disk config near ',hda'

So I have a file backed guest that "should" be perfectly usable, only
I can't figure out how to boot the thing...

Can someone point me to a clue to help me catch up to the state of Xen today?

Cheers
Jeff

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