Re: Qemu upstream bugs with xen

[Fabio Fantoni <fabio.fantoni@heliman.it>]

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?