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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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.

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