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[Xen-users] HVM DumU + Stubdom + stoarge backend domain


  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: "Brennecke, Simon" <simon.brennecke@xxxxxxx>
  • Date: Tue, 25 Oct 2016 12:41:22 +0000
  • Accept-language: en-US
  • Delivery-date: Tue, 25 Oct 2016 12:42:41 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
  • Thread-index: AdIuuXwaKhdyelD7SYyeAixfFIX/HQ==
  • Thread-topic: HVM DumU + Stubdom + stoarge backend domain

Hi people,

I'm running several virtual machines on a small cluster.
Among them are Windows VMs.
As a general concept all storage is managed by dedicated storage domU's.
In the past we simply mapped a volume from the storage domU to dom0 so that 
qemu can access it and provide it to windows.
Unfortunately this has the major drawback, that when the storage domU crashes 
or has to be rebooted, the dom0 basically also dies (it locks up so much that 
you cannot start/stop VMs any more).
Now in order to solve this problem, it appears that one has to use a stubdom 
which runs qemu and thus move the dependency to the starge dumU from dom0 to 
the stubdom.
I think I'm quite far in making it, but when the Windows VM starts, the bios 
tells me that the disk is not bootable/cannot be read - which I take as a hint 
that there is simply no disk attached.
Checking "xl block-list ..." also seems to conform this.

First off: is such a setup even possible? I read only hints on the internet 
that this should be possible, but I never found an actual working example.

My setup:
      Dom0: debian 8; xen 4.4.1
      DomU/storage: debian 8; tools installed; also serves a s a working 
storage backend for other PV domains
      DomU/Windows: Windows 2012 Server x64; XEN PV drivers installed

DomU/Windows config:

-------------- snip ------------
name = "v2-jw-winsvr2012x64-1"

builder = "hvm"
viridian = 1
memory = 16384
vcpus = 16
device_model_version = "qemu-xen-traditional"
device_model_stubdomain_override = 1
boot="c"

# Network devices
# docs/misc/xl-network-configuration.markdown
vif = [ 'mac=00:16:3E:ec:10:e9,bridge=br0,type=vif', 
'mac=00:16:3E:53:60:83,bridge=br1,type=vif' ]

# Disk Devices
# docs/misc/xl-disk-configuration.txt
disk = [ 
'format=raw,vdev=xvda,backend=osd,target=/dev/osd/v2-jw-winsvr2012x64-1' ]
#disk = [ 'format=raw,vdev=xvda,target=/dev/xvda' ]

# Guest VGA console configuration, either SDL or VNC
vnc = 1
vga = "stdvga"
#keymap = "de-de"
vncunused = 1
vnclisten = "0.0.0.0"
-------------- snip ------------

What I did so far:
1. Installed XEN via apt-get
2. Configured storage backend domain
3. Tested storage backend domain with other PV (linux) DomUs - working
4. Created windows domU with disk provided by dom0 - works
5. Compiled XEN 4.4.1 from souce to get access to the stubdom (could not find a 
package for it).
6. Changed config of windows domU to use stubdom, and disk still from dom0 - 
also works
7. Changed config to use storage domU - does not work anymore.

Output from xl -vvvvvvvvvv create v2-jw-winsvr2012x64-1.new:
-------------- snip ------------
Parsing config from v2-jw-winsvr2012x64-1.new
libxl: debug: libxl_create.c:1342:do_domain_create: ao 0x1df4c40: create: 
how=(nil) callback=(nil) poller=0x1df5670
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk vdev=xvda 
spec.backend=unknown
libxl: debug: libxl_device.c:183:disk_try_backend: Disk vdev=xvda, is using a 
storage driver domain, skipping physical device check
libxl: debug: libxl_device.c:286:libxl__device_disk_set_backend: Disk 
vdev=xvda, using backend phy
libxl: debug: libxl_create.c:797:initiate_domain_create: running bootloader
libxl: debug: libxl_bootloader.c:321:libxl__bootloader_run: not a PV domain, 
skipping bootloader
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1df59f8: deregister unregistered
libxl: debug: libxl_numa.c:478:libxl__get_numa_candidate: New best NUMA 
placement candidate found: nr_nodes=1, nr_cpus=20, nr_vcpus=20, free_memkb=34153
libxl: detail: libxl_dom.c:195:numa_place_domain: NUMA placement candidate with 
1 nodes, 20 cpus and 34153 KB free selected
xc: detail: elf_parse_binary: phdr: paddr=0x100000 memsz=0x9e6a4
xc: detail: elf_parse_binary: memory: 0x100000 -> 0x19e6a4
xc: detail: VIRTUAL MEMORY ARRANGEMENT:
  Loader:        0000000000100000->000000000019e6a4
  Modules:       0000000000000000->0000000000000000
  TOTAL:         0000000000000000->00000003ff800000
  ENTRY ADDRESS: 0000000000100000
xc: detail: PHYSICAL MEMORY ALLOCATION:
  4KB PAGES: 0x0000000000000200
  2MB PAGES: 0x00000000000003fb
  1GB PAGES: 0x000000000000000e
xc: detail: elf_load_binary: phdr 0 at 0x7f90856ad000 -> 0x7f908574252d
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk vdev=xvda 
spec.backend=phy
libxl: debug: libxl_device.c:183:disk_try_backend: Disk vdev=xvda, is using a 
storage driver domain, skipping physical device check
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1df7488 
wpath=/local/domain/1/backend/vbd/43/51712/state token=3/0: register slotnum=3
libxl: debug: libxl_create.c:1356:do_domain_create: ao 0x1df4c40: inprogress: 
poller=0x1df5670, flags=i
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1df7488 
wpath=/local/domain/1/backend/vbd/43/51712/state token=3/0: event 
epath=/local/domain/1/backend/vbd/43/51712/state
libxl: debug: libxl_event.c:657:devstate_watch_callback: backend 
/local/domain/1/backend/vbd/43/51712/state wanted state 2 still waiting state 1
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1df7488 
wpath=/local/domain/1/backend/vbd/43/51712/state token=3/0: event 
epath=/local/domain/1/backend/vbd/43/51712/state
libxl: debug: libxl_event.c:653:devstate_watch_callback: backend 
/local/domain/1/backend/vbd/43/51712/state wanted state 2 ok
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1df7488 
wpath=/local/domain/1/backend/vbd/43/51712/state token=3/0: deregister slotnum=3
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1df7488: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1df7510: deregister unregistered
libxl: debug: libxl_numa.c:478:libxl__get_numa_candidate: New best NUMA 
placement candidate found: nr_nodes=1, nr_cpus=20, nr_vcpus=7, free_memkb=775
libxl: detail: libxl_dom.c:195:numa_place_domain: NUMA placement candidate with 
1 nodes, 20 cpus and 775 KB free selected
domainbuilder: detail: xc_dom_allocate: cmdline=" -d 43", features=""
libxl: debug: libxl_dom.c:357:libxl__build_pv: pv kernel mapped 0 path 
/usr/lib/xen/boot/ioemu-stubdom.gz
domainbuilder: detail: xc_dom_kernel_file: 
filename="/usr/lib/xen/boot/ioemu-stubdom.gz"
domainbuilder: detail: xc_dom_malloc_filemap    : 2575 kB
domainbuilder: detail: xc_dom_malloc            : 14244 kB
domainbuilder: detail: xc_dom_do_gunzip: unzip ok, 0x283df3 -> 0xde9080
domainbuilder: detail: xc_dom_boot_xen_init: ver 4.4, caps 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 
domainbuilder: detail: xc_dom_parse_image: called
domainbuilder: detail: xc_dom_find_loader: trying multiboot-binary loader ... 
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying Linux bzImage loader ... 
domainbuilder: detail: xc_dom_probe_bzimage_kernel: kernel is not a bzImage
domainbuilder: detail: loader probe failed
domainbuilder: detail: xc_dom_find_loader: trying ELF-generic loader ... 
domainbuilder: detail: loader probe OK
xc: detail: elf_parse_binary: phdr: paddr=0x0 memsz=0x560828
xc: detail: elf_parse_binary: memory: 0x0 -> 0x560828
xc: detail: elf_xen_parse: __xen_guest: 
"GUEST_OS=Mini-OS,XEN_VER=xen-3.0,VIRT_BASE=0x0,ELF_PADDR_OFFSET=0x0,HYPERCALL_PAGE=0x2,LOADER=generic"
xc: detail: elf_xen_parse_guest_info: GUEST_OS="Mini-OS"
xc: detail: elf_xen_parse_guest_info: XEN_VER="xen-3.0"
xc: detail: elf_xen_parse_guest_info: VIRT_BASE="0x0"
xc: detail: elf_xen_parse_guest_info: ELF_PADDR_OFFSET="0x0"
xc: detail: elf_xen_parse_guest_info: HYPERCALL_PAGE="0x2"
xc: detail: elf_xen_parse_guest_info: LOADER="generic"
xc: detail: elf_xen_addr_calc_check: addresses:
xc: detail:     virt_base        = 0x0
xc: detail:     elf_paddr_offset = 0x0
xc: detail:     virt_offset      = 0x0
xc: detail:     virt_kstart      = 0x0
xc: detail:     virt_kend        = 0x560828
xc: detail:     virt_entry       = 0x0
xc: detail:     p2m_base         = 0xffffffffffffffff
domainbuilder: detail: xc_dom_parse_elf_kernel: xen-3.0-x86_64: 0x0 -> 0x560828
domainbuilder: detail: xc_dom_mem_init: mem 32 MB, pages 0x2000 pages, 4k each
domainbuilder: detail: xc_dom_mem_init: 0x2000 pages
domainbuilder: detail: xc_dom_boot_mem_init: called
domainbuilder: detail: x86_compat: guest xen-3.0-x86_64, address size 64
domainbuilder: detail: xc_dom_build_image: called
domainbuilder: detail: xc_dom_alloc_segment:   kernel       : 0x0 -> 0x561000  
(pfn 0x0 + 0x561 pages)
domainbuilder: detail: xc_dom_pfn_to_ptr_retcount: domU mapping: pfn 0x0+0x561 
at 0x7f9082c60000
xc: detail: elf_load_binary: phdr 0 at 0x7f9082c60000 -> 0x7f90831c0828
domainbuilder: detail: xc_dom_alloc_segment:   phys2mach    : 0x561000 -> 
0x571000  (pfn 0x561 + 0x10 pages)
domainbuilder: detail: xc_dom_pfn_to_ptr_retcount: domU mapping: pfn 0x561+0x10 
at 0x7f908573c000
domainbuilder: detail: xc_dom_alloc_page   :   start info   : 0x571000 (pfn 
0x571)
domainbuilder: detail: xc_dom_alloc_page   :   xenstore     : 0x572000 (pfn 
0x572)
domainbuilder: detail: xc_dom_alloc_page   :   console      : 0x573000 (pfn 
0x573)
domainbuilder: detail: nr_page_tables: 0x0000ffffffffffff/48: 
0x0000000000000000 -> 0x0000ffffffffffff, 1 table(s)
domainbuilder: detail: nr_page_tables: 0x0000007fffffffff/39: 
0x0000000000000000 -> 0x0000007fffffffff, 1 table(s)
domainbuilder: detail: nr_page_tables: 0x000000003fffffff/30: 
0x0000000000000000 -> 0x000000003fffffff, 1 table(s)
domainbuilder: detail: nr_page_tables: 0x00000000001fffff/21: 
0x0000000000000000 -> 0x00000000007fffff, 4 table(s)
domainbuilder: detail: xc_dom_alloc_segment:   page tables  : 0x574000 -> 
0x57b000  (pfn 0x574 + 0x7 pages)
domainbuilder: detail: xc_dom_pfn_to_ptr_retcount: domU mapping: pfn 0x574+0x7 
at 0x7f9085735000
domainbuilder: detail: xc_dom_alloc_page   :   boot stack   : 0x57b000 (pfn 
0x57b)
domainbuilder: detail: xc_dom_build_image  : virt_alloc_end : 0x57c000
domainbuilder: detail: xc_dom_build_image  : virt_pgtab_end : 0x800000
domainbuilder: detail: xc_dom_boot_image: called
domainbuilder: detail: arch_setup_bootearly: doing nothing
domainbuilder: detail: xc_dom_compat_check: supported guest type: 
xen-3.0-x86_64 <= matches
domainbuilder: detail: xc_dom_compat_check: supported guest type: 
xen-3.0-x86_32p
domainbuilder: detail: xc_dom_compat_check: supported guest type: hvm-3.0-x86_32
domainbuilder: detail: xc_dom_compat_check: supported guest type: 
hvm-3.0-x86_32p
domainbuilder: detail: xc_dom_compat_check: supported guest type: hvm-3.0-x86_64
domainbuilder: detail: xc_dom_update_guest_p2m: dst 64bit, pages 0x2000
domainbuilder: detail: clear_page: pfn 0x573, mfn 0x105397f
domainbuilder: detail: clear_page: pfn 0x572, mfn 0x1053980
domainbuilder: detail: xc_dom_pfn_to_ptr_retcount: domU mapping: pfn 0x571+0x1 
at 0x7f9085754000
domainbuilder: detail: start_info_x86_64: called
domainbuilder: detail: setup_hypercall_page: vaddr=0x2000 pfn=0x2
domainbuilder: detail: domain builder memory footprint
domainbuilder: detail:    allocated
domainbuilder: detail:       malloc             : 14343 kB
domainbuilder: detail:       anon mmap          : 0 bytes
domainbuilder: detail:    mapped
domainbuilder: detail:       file mmap          : 2575 kB
domainbuilder: detail:       domU mmap          : 5604 kB
domainbuilder: detail: arch_setup_bootlate: shared_info: pfn 0x0, mfn 0x73a82
domainbuilder: detail: shared_info_x86_64: called
domainbuilder: detail: vcpu_x86_64: called
domainbuilder: detail: vcpu_x86_64: cr3: pfn 0x574 mfn 0x105397e
domainbuilder: detail: launch_vm: called, ctxt=0x7f9085733004
domainbuilder: detail: xc_dom_release: called
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk vdev=xvda 
spec.backend=phy
libxl: debug: libxl_device.c:183:disk_try_backend: Disk vdev=xvda, is using a 
storage driver domain, skipping physical device check
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1dfa9b8 
wpath=/local/domain/1/backend/vbd/44/51712/state token=3/1: register slotnum=3
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1dfa9b8 
wpath=/local/domain/1/backend/vbd/44/51712/state token=3/1: event 
epath=/local/domain/1/backend/vbd/44/51712/state
libxl: debug: libxl_event.c:657:devstate_watch_callback: backend 
/local/domain/1/backend/vbd/44/51712/state wanted state 2 still waiting state 1
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1dfa9b8 
wpath=/local/domain/1/backend/vbd/44/51712/state token=3/1: event 
epath=/local/domain/1/backend/vbd/44/51712/state
libxl: debug: libxl_event.c:653:devstate_watch_callback: backend 
/local/domain/1/backend/vbd/44/51712/state wanted state 2 ok
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1dfa9b8 
wpath=/local/domain/1/backend/vbd/44/51712/state token=3/1: deregister slotnum=3
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dfa9b8: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dfaa40: deregister unregistered
libxl: debug: libxl_dm.c:1303:libxl__spawn_local_dm: Spawning device-model 
/usr/lib/xen/bin/qemu-dm with arguments:
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   /usr/lib/xen/bin/qemu-dm
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   -d
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   44
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   -domain-name
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   v2-jw-winsvr2012x64-1-dm
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   -vnc
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   0.0.0.0:0,password
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   -vncunused
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   -M
libxl: debug: libxl_dm.c:1305:libxl__spawn_local_dm:   xenpv
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1df6070 
wpath=/local/domain/0/device-model/44/state token=3/2: register slotnum=3
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1df6070 
wpath=/local/domain/0/device-model/44/state token=3/2: event 
epath=/local/domain/0/device-model/44/state
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1df6070 
wpath=/local/domain/0/device-model/44/state token=3/2: event 
epath=/local/domain/0/device-model/44/state
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1df6070 
wpath=/local/domain/0/device-model/44/state token=3/2: deregister slotnum=3
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1df6070: deregister unregistered
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1dfe858 
wpath=/local/domain/0/backend/vif/44/0/state token=3/3: register slotnum=3
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1dff1f8 
wpath=/local/domain/0/backend/vif/44/1/state token=2/4: register slotnum=2
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1dfe858 
wpath=/local/domain/0/backend/vif/44/0/state token=3/3: event 
epath=/local/domain/0/backend/vif/44/0/state
libxl: debug: libxl_event.c:653:devstate_watch_callback: backend 
/local/domain/0/backend/vif/44/0/state wanted state 2 ok
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1dfe858 
wpath=/local/domain/0/backend/vif/44/0/state token=3/3: deregister slotnum=3
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dfe858: deregister unregistered
libxl: debug: libxl_device.c:1023:device_hotplug: calling hotplug script: 
/etc/xen/scripts/vif-bridge online
libxl: debug: libxl_event.c:483:watchfd_callback: watch 
epath=/local/domain/0/backend/vif/44/0/state token=3/3: empty slot
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1dff1f8 
wpath=/local/domain/0/backend/vif/44/1/state token=2/4: event 
epath=/local/domain/0/backend/vif/44/1/state
libxl: debug: libxl_event.c:653:devstate_watch_callback: backend 
/local/domain/0/backend/vif/44/1/state wanted state 2 ok
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1dff1f8 
wpath=/local/domain/0/backend/vif/44/1/state token=2/4: deregister slotnum=2
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dff1f8: deregister unregistered
libxl: debug: libxl_device.c:1023:device_hotplug: calling hotplug script: 
/etc/xen/scripts/vif-bridge online
libxl: debug: libxl_event.c:483:watchfd_callback: watch 
epath=/local/domain/0/backend/vif/44/1/state token=2/4: empty slot
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dfe8e0: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dfe8e0: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dff280: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1dff280: deregister unregistered
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1e00738 
wpath=/local/domain/0/backend/vif/43/0/state token=2/5: register slotnum=2
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0x1e01288 
wpath=/local/domain/0/backend/vif/43/1/state token=3/6: register slotnum=3
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1e00738 
wpath=/local/domain/0/backend/vif/43/0/state token=2/5: event 
epath=/local/domain/0/backend/vif/43/0/state
libxl: debug: libxl_event.c:653:devstate_watch_callback: backend 
/local/domain/0/backend/vif/43/0/state wanted state 2 ok
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1e00738 
wpath=/local/domain/0/backend/vif/43/0/state token=2/5: deregister slotnum=2
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1e00738: deregister unregistered
libxl: debug: libxl_device.c:1023:device_hotplug: calling hotplug script: 
/etc/xen/scripts/vif-bridge online
libxl: debug: libxl_event.c:483:watchfd_callback: watch 
epath=/local/domain/0/backend/vif/43/0/state token=2/5: empty slot
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1e01288 
wpath=/local/domain/0/backend/vif/43/1/state token=3/6: event 
epath=/local/domain/0/backend/vif/43/1/state
libxl: debug: libxl_event.c:653:devstate_watch_callback: backend 
/local/domain/0/backend/vif/43/1/state wanted state 2 ok
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0x1e01288 
wpath=/local/domain/0/backend/vif/43/1/state token=3/6: deregister slotnum=3
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1e01288: deregister unregistered
libxl: debug: libxl_device.c:1023:device_hotplug: calling hotplug script: 
/etc/xen/scripts/vif-bridge online
libxl: debug: libxl_event.c:483:watchfd_callback: watch 
epath=/local/domain/0/backend/vif/43/1/state token=3/6: empty slot
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1e007c0: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1e007c0: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1e01310: deregister unregistered
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1e01310: deregister unregistered
libxl: debug: libxl_event.c:1761:libxl__ao_progress_report: ao 0x1df4c40: 
progress report: ignored
libxl: debug: libxl_event.c:1591:libxl__ao_complete: ao 0x1df4c40: complete, 
rc=0
libxl: debug: libxl_event.c:1563:libxl__ao__destroy: ao 0x1df4c40: destroy
xc: debug: hypercall buffer: total allocations:1715 total releases:1715
xc: debug: hypercall buffer: current allocations:0 maximum allocations:4
xc: debug: hypercall buffer: cache current size:4
xc: debug: hypercall buffer: cache hits:1697 misses:4 toobig:14
-------------- snip ------------

xl list:
v2-jw-winsvr2012x64-1                       45 16383     1     r-----      12.8
v2-jw-winsvr2012x64-1-dm                    46    32     1     -b----       0.1

xl block-list v2-jw-winsvr2012x64-1:
Vdev  BE  handle state evt-ch ring-ref BE-path

xl block-list v2-jw-winsvr2012x64-1-dm:
Vdev  BE  handle state evt-ch ring-ref BE-path



Any ideas what could be the problem?
I tried also various vdev-names (hda, xvda, xvdb) - no luck.

Any suggestions/hints would be very welcome.

Thanks & Regards
Simon

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