Re: [Xen-devel] Qemu upstream bugs with xen

[George Dunlap <dunlapg@xxxxxxxxx>]

On Fri, Jan 18, 2013 at 2:44 PM, Fabio Fantoni <fabio.fantoni@xxxxxxxxxx> wrote:

Il 18/01/2013 14:00, Stefano Stabellini ha scritto:

On Fri, 18 Jan 2013, Fabio Fantoni wrote:

1) Both linux and windows domU with qemu upstream have an additional
empty floppy and cdrom.
Is there a way to remove these additionals block devices?

the best way would be to pass a device or a global command line option
to QEMU to change the default for isa-fdc

2) xl cd-eject and cd-insert are not working:

xl -vvv cd-eject W7 hdb
libxl: debug: libxl.c:2389:libxl_cdrom_insert: ao 0x1b95990: create:
how=(nil) callback=(nil) poller=0x1b95930
libxl: debug: libxl_device.c:229:libxl__device_disk_set_backend: Disk
vdev=hdb spec.backend=phy
libxl: debug: libxl_device.c:175:disk_try_backend: Disk vdev=hdb,
backend phy unsuitable as phys path not a block device
libxl: error: libxl_device.c:269:libxl__device_disk_set_backend: no
suitable backend for disk hdb

cd-eject should work by trying to insert an empty cdrom.
In particular the disk format should be LIBXL_DISK_FORMAT_EMPTY, but I
think this is not the case here.
I guess it is a bug in parse_disk_config.

libxl: debug: libxl_event.c:1482:libxl__ao_abort: ao 0x1b95990: abort
libxl: debug: libxl_event.c:1472:libxl__ao__destroy: ao 0x1b95990: destroy
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:1 misses:2 toobig:1

xl -vvv cd-insert W7 hdb raw:/mnt/vm/iso/QUANTAL.iso
libxl: debug: libxl.c:2389:libxl_cdrom_insert: ao 0x1d07990: create:
how=(nil) callback=(nil) poller=0x1d079f0
libxl: debug: libxl_device.c:229:libxl__device_disk_set_backend: Disk
vdev=hdb spec.backend=phy
libxl: error: libxl_device.c:243:libxl__device_disk_set_backend: Disk
vdev=hdb failed to stat: raw:/mnt/vm/iso/QUANTAL.iso: No such file or
directory

It looks like it is trying to stat "raw:/mnt/vm/iso/QUANTAL.iso" instead
of "/mnt/vm/iso/QUANTAL.iso".  The format parsing must be wrong.

libxl: debug: libxl_event.c:1482:libxl__ao_abort: ao 0x1d07990: abort
libxl: debug: libxl_event.c:1472:libxl__ao__destroy: ao 0x1d07990: destroy
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:1 misses:2 toobig:1

Seem there is parsing error about backend and device/iso path, for now I
not found solution for fix it on code.

I've added -nodefaults option to qemu upstream to remove empty floppy and cdrom with success. Please could this be added by default on libxl on qemu upstream starting?

About cd-eject cd-insert parsing bug can you solve please?

I'll put this on the release tracking list.

 -George

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