xenner

I have been using KVM successfully on Fedora 12 and RHEL 5.4. I have Xen guests which I would like to run on KVM (even if just in testing) so I considered using xenner, but I was not successful. My notes are below if anyone wants to point out what I might be missing.

On an existing system running KVM:

* yum install xenner
(1/3): xen-hypervisor-3.4.1-5.fc12.x86_64.rpm            | 2.8 MB     00:00     
(2/3): xen-runtime-3.4.1-5.fc12.x86_64.rpm               | 4.0 MB     00:00     
(3/3): xenner-0.47-3.fc12.x86_64.rpm                     | 191 kB     00:00     
* /etc/init.d/xenner start

I read an example in RedHat's bugzilla from the Xenner author:

Comment #7 From  Gerd Hoffmann  2008-07-03 03:45:15 EDT: 
"For a quick bootup test you don't need an image, you can grab xen
kernel and initrd from any fedora install dvd (images/xen/), then run
"xenner -kernel vmlinuz -initrd initrd.img -vnc 127.0.0.1:0".
Connecting with a vnc viewer to display :0 should show then the first
stage install screen (probably complaining it couldn't find a disk)."

I couldn't exactly find the files he was talking on a Fedora 12 DVD about so I used a Xen kernel and initrd from an installed RHEL5 system's /boot. I then did the following:

 sudo xenner \
 -kernel vmlinuz-2.6.18-164.6.1.el5xen \
 -initrd initrd-2.6.18-164.6.1.el5xen.img \
 -vnc 127.0.0.1:0 \
 -hda guest.img 

xenner-stats on another terminal as I ran the above reported that it couldn't parse the core file in /var/run/xenner. The results of running the xenner command above follow:

kvm capability clocksource: not enabled
kvm capability nop-iodelay: not enabled
kvm capability mmu-op: not enabled
domid: 14258
-videoram option does not work with cirrus vga device model. Videoram set to 4M.
frontend `/local/domain/14258/device/vbd/51712' devtype `vbd' expected backend `/local/domain/0/backend/tap/14258/51712' got `/local/domain/0/backend/blkbackd/14258/51712', ignoring
frontend `/local/domain/14258/device/vbd/51712' devtype `vbd' expected backend `/local/domain/0/backend/tap/14258/51712' got `/local/domain/0/backend/blkbackd/14258/51712', ignoring
Watching /local/domain/0/device-model/14258/logdirty/next-active
Watching /local/domain/0/device-model/14258/command
/builddir/build/BUILD/xen-3.4.1/tools/ioemu-dir/hw/xen_blktap.c:628: Init blktap pipes
Could not open /var/run/tap/qemu-read-14258
xs_read(): vncpasswd get error. /vm/b254f64e-b232-477c-9285-c693c34fd432/vncpasswd.
==================== setup ====================
xen_guest_parse: ----- parse kernel -----
[xenner,1] domain_builder: memory: emu 4 MB, m2p 4 MB, guest 120 MB
xen_emu_load: ----- load xen emu -----
[xenner,1] xen_load_emu_file: loading /usr/lib64/xenner/emu64.elf (190936 bytes)
xen_emu_setup: ----- memory info -----
xen_emu_setup: ----- emu pgd setup -----
xen_guest_setup: ----- memory setup -----
xen_guest_setup: ----- create start-of-day -----
xen_guest_setup: ----- setup xen hypercall page -----
xen_guest_setup: ----- setup vcpu context -----
domain_builder: ----- kvm: state setup -----
domain_builder: ----- all done -----
xen be: console-0: reading backend state failed
xen be: console-0: reading backend state failed
xen be: console-0: reading frontend path failed
calibrate tsc ... done, 3193 MHz, shift: -1, mul_frac: 2690089865
==================== boot ====================
[xenner,1] setup_regs: 64bit
[xenner,1] vcpu_thread/0: start
[emu] <0>this is emu64 (xenner 0.47), boot cpu #0
[emu] <1>emu64: configuration done
[emu] <1>cpu_alloc: cpu 0
[emu] <1>cpu_init: cpu 0
[emu] <1>pv_init: cpu 0, signature "KVMKVMKVM", features 0x00000000:
[emu] <1>emu64: boot cpu setup done
[emu] <1>emu64: paging setup done
[emu] <0>print_page_fault_info: [kernel-mode] preset read kernel reserved-bit, rip ffff8300000098a3, cr2 ffff820000000020, vcpu 0
[emu] <0>page table walk for va ffff820000000020, root_mfn 1905
[emu] <0>pgd   : ffff830001905000 +260  |  mfn   48  |   global dirty accessed user write present
[emu] <0> pud  : ffff830000048000 +  0  |  mfn   49  |   global dirty accessed user write present
[emu] <0>  pmd : ffff830000049000 +  0  |  mfn   4a  |   global dirty accessed user write present
[emu] <0>   pte: ffff83000004a000 +  0  |  mfn fee00  |   global dirty accessed write present
[emu] <0>panic: ring0 (emu) page fault
[emu] <0>printing registers
[emu] <0>  code   cs:rip e008:ffff8300000098a3
[emu] <0>  stack  ss:rsp e010:ffff83000002bea0
[emu] <0>  rax ffff820000000000 rbx ffff830000033000 rcx ffff830000000000 rdx 00000000fee00163
[emu] <0>  rsi 0000000000000000 rdi 0000000000001000 rsp ffff83000002bea0 rbp ffff830000033000
[emu] <0>  r8  ffff83000004a000 r9  ffff83000000e92a r10 ffff83000000e494 r11 000000000000000a
[emu] <0>  r12 000000000002a000 r13 00000000fee00900 r14 00000000fee00000 r15 0000000000000000
[emu] <0>  cs e008 ds e010 es e010 fs e010 gs e010 ss e010
[emu] <0>  cr0 80050033 cr2 ffff820000000020 cr3 01905000 cr4 000006b0 rflags 00010086
[emu] <0>  cr0: PE MP ET NE WP AM PG
[emu] <0>  cr4: PSE PAE PGE OSFXSR OSXMMEXCPT
[emu] <0>  rflags: ??? PF ??? RF
[emu] <0>printing stack ffff83000002bea0 - ffff83000002bff8
[emu] <0>  ffff83000002bea0: 0000000000000400
[emu] <0>  ffff83000002bea8: 0000000000000800
[emu] <0>  ffff83000002beb0: ffff800000000000
[emu] <0>  ffff83000002beb8: 00000000000001e7
[emu] <0>  ffff83000002bec0: 564b4d564b4d564b
[emu] <0>  ffff83000002bec8: ffff800000000000
[emu] <0>  ffff83000002bed0: 00000f6400000001
[emu] <0>  ffff83000002bed8: 0000e43500010800
[emu] <0>  ffff83000002bee0: ffff8300bfe9c3f1
[emu] <0>  ffff83000002bee8: ffff830000005b70
[emu] <0>  ffff83000002bef0: ffff83000002bf50
[emu] <0>  ffff83000002bef8: ffff830000033000
[emu] <0>  ffff83000002bf00: 000000000002a000
[emu] <0>  ffff83000002bf08: ffff830000028000
[emu] <0>  ffff83000002bf10: 0000000000000000
[emu] <0>  ffff83000002bf18: ffff8300000051cb
[emu] <0>  ffff83000002bf20: 0000000000000000
[emu] <0>  ffff83000002bf28: 0000000000000000
[emu] <0>  ffff83000002bf30: 0000000000000000
[emu] <0>  ffff83000002bf38: 0000000000000000
[emu] <0>  ffff83000002bf40: 0000000000000000
[emu] <0>  ffff83000002bf48: ffff83000000001d
[emu] <0>  ffff83000002bf50: 0000000000000000
[emu] <0>  ffff83000002bf58: 0000000000000000
[emu] <0>  ffff83000002bf60: 0000000000000000
[emu] <0>  ffff83000002bf68: 0000000000000000
[emu] <0>  ffff83000002bf70: 0000000000000000
[emu] <0>  ffff83000002bf78: 0000000000000000
[emu] <0>  ffff83000002bf80: 0000000000000000
[emu] <0>  ffff83000002bf88: 0000000000000000
[emu] <0>  ffff83000002bf90: 0000000000000000
[emu] <0>  ffff83000002bf98: 0000000000000000
[emu] <0>  ffff83000002bfa0: 0000000000000000
[emu] <0>  ffff83000002bfa8: 0000000000000000
[emu] <0>  ffff83000002bfb0: 0000000000000000
[emu] <0>  ffff83000002bfb8: 0000000000000000
[emu] <0>  ffff83000002bfc0: 0000000000000000
[emu] <0>  ffff83000002bfc8: 0000000000000000
[emu] <0>  ffff83000002bfd0: 0000000000000000
[emu] <0>  ffff83000002bfd8: 0000000000000000
[emu] <0>  ffff83000002bfe0: 0000000000000000
[emu] <0>  ffff83000002bfe8: 0000000000000000
[emu] <0>  ffff83000002bff0: 0000000000000000
[emu] <0>  ffff83000002bff8: 0000000000000000
guest requests shutdown, exiting.
xenner_cleanup: ----- statistics -----
hypercalls             :      total     diff
emu faults             :      total     diff
  page fault           :          1        0
  cr3 load             :          2        0
event channels         :      total     diff
xenner_cleanup: ----- cleaning up -----