[Xen-users] Can not attach vhd image and start vhd-based domU

[Andrey <basketboy@xxxxx>]

Hello,

 I'm trying to block-attach vhd image to dom0 using blktap2 with xen 
4.4 standard package installed on Debian Jessie, but with no luck.
'xl -vvv block-attach 0 /home/data/centos-6.vhd,vhd,xvda,w'

Output of this command:

libxl: debug: libxl.c:3538:libxl_device_disk_add: ao 0x1ef48e0: create: 
how=(nil) callback=(nil) poller=0x1ef4940
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk 
vdev=xvda spec.backend=unknown
libxl: debug: libxl_device.c:234:disk_try_backend: Disk vdev=xvda, 
backend phy unsuitable due to format vhd
libxl: debug: libxl_device.c:286:libxl__device_disk_set_backend: Disk 
vdev=xvda, using backend qdisk
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1ef4b60: deregister unregistered
libxl: debug: libxl_event.c:1591:libxl__ao_complete: ao 0x1ef48e0: 
complete, rc=0
libxl: debug: libxl.c:3538:libxl_device_disk_add: ao 0x1ef48e0: 
inprogress: poller=0x1ef4940, flags=ic
libxl: debug: libxl_event.c:1563:libxl__ao__destroy: ao 0x1ef48e0: destroy
xc: debug: hypercall buffer: total allocations:3 total releases:3
xc: debug: hypercall buffer: current allocations:0 maximum allocations:2
xc: debug: hypercall buffer: cache current size:2
xc: debug: hypercall buffer: cache hits:1 misses:2 toobig:0

As I see it selects qdisk as backend, deregister with no xvda device 
created.
However, 'xl block-list 0' shows Vdev:

Vdev  BE  handle state evt-ch ring-ref BE-path
51712 0   0      3     77     8        /local/domain/0/backend/qdisk/0/51712

But then detach ('xl -vvv block-detach  0 51712') does not work also:

libxl: debug: libxl.c:3488:libxl_device_disk_remove: ao 0x1eb38e0: 
create: how=(nil) callback=(nil) poller=0x1eb3d10
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch 
w=0x1eb3e88 wpath=/local/domain/0/backend/qdisk/0/51712/state token=3/0: 
register slotnum=3
libxl: debug: libxl.c:3488:libxl_device_disk_remove: ao 0x1eb38e0: 
inprogress: poller=0x1eb3d10, flags=i
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1eb3e88 
wpath=/local/domain/0/backend/qdisk/0/51712/state token=3/0: event 
epath=/local/domain/0/backend/qdisk/0/51712/state
libxl: debug: libxl_event.c:657:devstate_watch_callback: backend 
/local/domain/0/backend/qdisk/0/51712/state wanted state 6 still waiting 
state 5
libxl: debug: libxl_event.c:671:devstate_timeout: backend 
/local/domain/0/backend/qdisk/0/51712/state wanted state 6  timed out
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch 
w=0x1eb3e88 wpath=/local/domain/0/backend/qdisk/0/51712/state token=3/0: 
deregister slotnum=3
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1eb3e88: deregister unregistered
libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch 
w=0x1eb3e88 wpath=/local/domain/0/backend/qdisk/0/51712/state token=3/1: 
register slotnum=3
libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0x1eb3e88 
wpath=/local/domain/0/backend/qdisk/0/51712/state token=3/1: event 
epath=/local/domain/0/backend/qdisk/0/51712/state
libxl: debug: libxl_event.c:657:devstate_watch_callback: backend 
/local/domain/0/backend/qdisk/0/51712/state wanted state 6 still waiting 
state 5
libxl: debug: libxl_event.c:671:devstate_timeout: backend 
/local/domain/0/backend/qdisk/0/51712/state wanted state 6  timed out
libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch 
w=0x1eb3e88 wpath=/local/domain/0/backend/qdisk/0/51712/state token=3/1: 
deregister slotnum=3
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1eb3e88: deregister unregistered
libxl: error: libxl_device.c:935:device_backend_callback: unable to 
remove device with path /local/domain/0/backend/qdisk/0/51712
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x1eb3f10: deregister unregistered
libxl: error: libxl.c:1724:device_addrm_aocomplete: unable to remove vbd 
with id 51712
libxl: debug: libxl_event.c:1591:libxl__ao_complete: ao 0x1eb38e0: 
complete, rc=-9
libxl: debug: libxl_event.c:1563:libxl__ao__destroy: ao 0x1eb38e0: destroy
libxl_device_disk_remove failed.
xc: debug: hypercall buffer: total allocations:4 total releases:4
xc: debug: hypercall buffer: current allocations:0 maximum allocations:2
xc: debug: hypercall buffer: cache current size:2
xc: debug: hypercall buffer: cache hits:2 misses:2 toobig:0


VHD-based domU can't start too with the following disk config 
['/home/data/centos-6.vhd,vhd,xvda,rw']:
Parsing config from /etc/xen/otrs-test
libxl: debug: libxl_create.c:1342:do_domain_create: ao 0x6fbbd0: create: 
how=(nil) callback=(nil) poller=0x6fc1a0
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk 
vdev=xvda spec.backend=unknown
libxl: debug: libxl_device.c:234:disk_try_backend: Disk vdev=xvda, 
backend phy unsuitable due to format vhd
libxl: debug: libxl_device.c:286:libxl__device_disk_set_backend: Disk 
vdev=xvda, using backend qdisk
libxl: debug: libxl_create.c:797:initiate_domain_create: running bootloader
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk 
vdev=(null) spec.backend=qdisk
libxl: debug: libxl_device.c:251:libxl__device_disk_set_backend: Disk 
vdev=xvda spec.backend=qdisk
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x6fc400: deregister unregistered
libxl: debug: libxl.c:2712:local_device_attach_cb: locally attaching 
qdisk /dev/xvda
libxl: error: libxl_device.c:1225:libxl__wait_for_backend: Backend 
/local/domain/0/backend/qdisk/0/51712 not ready
libxl: error: libxl_bootloader.c:405:bootloader_disk_attached_cb: failed 
to attach local disk for bootloader execution
libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch 
w=0x6fc528: deregister unregistered
libxl: error: libxl_bootloader.c:276:bootloader_local_detached_cb: 
unable to detach locally attached disk
libxl: error: libxl_create.c:1022:domcreate_rebuild_done: cannot 
(re-)build domain: -3
libxl: debug: libxl_event.c:1591:libxl__ao_complete: ao 0x6fbbd0: 
complete, rc=-3
libxl: debug: libxl_create.c:1356:do_domain_create: ao 0x6fbbd0: 
inprogress: poller=0x6fc1a0, flags=ic
libxl: debug: libxl_event.c:1563:libxl__ao__destroy: ao 0x6fbbd0: destroy
xc: debug: hypercall buffer: total allocations:25 total releases:25
xc: debug: hypercall buffer: current allocations:0 maximum allocations:2
xc: debug: hypercall buffer: cache current size:2
xc: debug: hypercall buffer: cache hits:21 misses:2 toobig:2

So the main question is how to use VHD-based images with Xen 4.4? Is it 
possible with upstream qemu?
It is strange that I created this centos-6.vhd image with the same disk 
configuration (second disk after ISO).
With regards, Andrey.

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