Xen users - Jan 2012 - Problem with DomU, gentoo, xen-4.1.1

Hello!

 # uname -a
Linux localhost 3.0.6-gentoo #4 SMP Sun Jan 1 04:25:00 Local time zone must be
set--see zic m x86_64 Intel(R) Xeon(R) CPU E31270 @ 3.40GHz GenuineIntel
GNU/Linux

# xl list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  3045     8     r-----    1060.0

DomU .config:
# cat /usr/src/linux/.config | grep XEN
# CONFIG_XEN is not set
# CONFIG_XEN_PRIVILEGED_GUEST is not set


# cat /xen/gentoo.vm
kernel = "/xen/gentoo-3.0.6"     <----- DomU kernel
memory = 1024
name   = "gentoo"
disk   = [''file:/xen/disks/gentoo-root.img,sda1,w'']    
<---- Image with Gentoo
root   = "/dev/sda1 ro"
vcpus  = 2


# xl create gentoo.vm
Parsing config file gentoo.vm
xc: error: elf_xen_note_check: ERROR: Will only load images built for the
generic loader or Linux images: Invalid kernel
libxl: error: libxl_dom.c:196:libxl__build_pv xc_dom_parse_image failed: Success
cannot (re-)build domain: -3



What did I do wrong?

> # xl create gentoo.vm
> Parsing config file gentoo.vm
> xc: error: elf_xen_note_check: ERROR: Will only load images built for
> the generic loader or Linux images: Invalid kernel libxl: error:
> libxl_dom.c:196:libxl__build_pv xc_dom_parse_image failed: Success
> cannot (re-)build domain: -3
> What did I do wrong?
Is the kernel compressed with xz? Try to build a kernel with bzip2
compression. Afaik the fairly recently implemented xz compression is
still not working properly on Xen stable.

> DomU .config:
> # cat /usr/src/linux/.config | grep XEN
> # CONFIG_XEN is not set
> # CONFIG_XEN_PRIVILEGED_GUEST is not set
>
>
> # cat /xen/gentoo.vm
> kernel = "/xen/gentoo-3.0.6"     <----- DomU kernel
> memory = 1024
> name   = "gentoo"
> disk   = [''file:/xen/disks/gentoo-root.img,sda1,w'']    
<---- Image
> with Gentoo
> root   = "/dev/sda1 ro"
> vcpus  = 2
It also appears that you didn''t add Xen PV support to the kernel 
according to those configuration options.  In this case you will need to 
use the HVM loader in your gentoo.vm configuration (loader = "hvm") or
rebuild your kernel to add PV support.

James

> > # xl create gentoo.vm
> > Parsing config file gentoo.vm
> > xc: error: elf_xen_note_check: ERROR: Will only load images built
> > for the generic loader or Linux images: Invalid kernel libxl: error:
> > libxl_dom.c:196:libxl__build_pv xc_dom_parse_image failed: Success
> > cannot (re-)build domain: -3
> 
> > What did I do wrong?
> 
> Is the kernel compressed with xz? Try to build a kernel with bzip2
> compression. Afaik the fairly recently implemented xz compression is
> still not working properly on Xen stable.
Hmm, yesterday I recompiled xen stable from hg, revision 23206 and get
this error too when I use pv-grub. I tried to use a previous, working
pv-grub while not downgrading Xen and this was enough to get my pv''s to
boot again. Might be a bug... Devs?