RE: [Xen-devel] Problem with blktap2

["Zhang, Yang" <yang.zhang@xxxxxxxxx>]

Sorry, qemu's issue also has been fixed by c/s 
5e592af4bc5649ef0066c77db445c3be26b4c7bb. 

Best Regards
--yang

-----Original Message-----
From: Jun Koi [mailto:junkoi2004@xxxxxxxxx] 
Sent: 2009年6月19日 11:35
To: Zhang, Yang
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Problem with blktap2

2009/6/19 Zhang, Yang <yang.zhang@xxxxxxxxx>:
> i'm not sure that since the blktap2 changes the config. I always uses the 
> config "tap:tapdisk:qcow2:/root/xxx". This always fine to qcow2
>

I changed my disk configuration to:

disk = ['tap:tapdisk:qcow2:/home/xen/img.qcow2.ubuntu904,hda,w']

But then when creating the VM, it hang up for a minute or so, and
finally reported error like:

"Error: Device 768 (tap) could not be connected. Hotplug scripts not working."

You suggested to kill "tapdisk", but I dont see any process like
"tapdisk" running in my box (only blktapctrl). Is that a problem??

Then qemu log reports error like below. I am especially concerning
about the error "type tapdisk unknown...", so I am not sure that the
above disk configuration (..tapdisk...) is correct. Do you have any
idea?

Thanks,
J


cat /var/log/xen/qemu-dm-ubuntu904.log
domid: 2
qemu: the number of cpus is 1
config qemu network with xen bridge for  tap2.0 xenbr0
Strip off blktap sub-type prefix to
qcow2:/home/xen/img.qcow2.ubuntu904 (drv 'tapdisk')
qemu: type (image format) 'tapdisk' unknown for vbd
'/local/domain/0/backend/tap/2/768/type' or image
'qcow2:/home/xen/img.qcow2.ubuntu904'
Watching /local/domain/0/device-model/2/logdirty/next-active
Watching /local/domain/0/device-model/2/command
qemu_map_cache_init nr_buckets = 4000 size 327680
shared page at pfn feffd
buffered io page at pfn feffb
Guest uuid = 7b6c05c7-1686-699b-dfdd-ef25da4d2039
Time offset set 0
populating video RAM at ff000000
mapping video RAM from ff000000
Register xen platform.
Done register platform.
xs_read(/vm/7b6c05c7-1686-699b-dfdd-ef25da4d2039/log-throttling): read error
platform_fixed_ioport: changed ro/rw state of ROM memory area. now is rw state.
xs_read(/local/domain/0/device-model/2/xen_extended_power_mgmt): read error
xs_read(): vncpasswd get error.
/vm/7b6c05c7-1686-699b-dfdd-ef25da4d2039/vncpasswd.
I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0







> -----Original Message-----
> From: Jun Koi [mailto:junkoi2004@xxxxxxxxx]
> Sent: 2009年6月19日 11:04
> To: Zhang, Yang
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Problem with blktap2
>
> 2009/6/19 Zhang, Yang <yang.zhang@xxxxxxxxx>:
>>  I meet this issue before. You can reboot and have a try.
>>  If still exist, stop xend and kill process blktapctrl and tapdisk, run make 
>> install again to see this issue whether still exist.
>>
>
> hmm. then the problem will vanish for goods? i will try now, and let
> you know the result.
>
> Could you confirm that
>
> disk = ['tap:aio:qcow:/home/xen/img.qcow2.ubuntu904,hda,w']
>
> is a right configuration?
>
> Thanks a lot,
> J
>
>
>
>
>> -----Original Message-----
>> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
>> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jun Koi
>> Sent: 2009年6月19日 10:38
>> To: xen-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: [Xen-devel] Problem with blktap2
>>
>> Hi,
>>
>> I am trying to use the unstable tree (changeset: 19738) to run some old 
>> images.
>>
>> My old configuration file has:
>>
>> disk = ['tap:qcow2:/home/xen/img.qcow2.ubuntu904,hda,w']
>>
>> I got the error like:
>>
>> ----
>> Using config file "./ubuntu904.cfg".
>> Error: need more than 3 values to unpack
>>
>> I guess that I should modify the disk configuration for new blktap2,
>> so I changed it to :
>>
>> disk = ['tap:aio:qcow:/home/xen/img.qcow2.ubuntu904,hda,w']
>> ----
>>
>> but then i still got the error like below:
>>
>> ----
>> Using config file "./ubuntu904.cfg".
>> Error: Failed to create device.
>>    stdout: vbd open failed: -1
>>    stderr:
>> Check that target "/home/xen/img.qcow2.ubuntu904" exists and that
>> blktap2 driver installed in dom0.
>> ----
>>
>> I can confirm that I have blktap2 installed, as in
>> /boot/config-2.6.18.8-xen I have:
>>
>> CONFIG_XEN_BLKDEV_TAP=y
>> CONFIG_XEN_BLKDEV_TAP2=y
>>
>> So how can I fix the problem now?
>>
>> Thanks,
>> J
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel
>>
>

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