Re: [Qemu-devel] [PATCH 6/9] vhost-scsi: new device supporting the tcm_vhost Linux kernel module

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

于 2013-6-20 9:33, Asias He 写道:
> On Wed, Jun 19, 2013 at 12:55:10PM +0000, Libaiqing wrote:
>> Hi paolo,
>>    The vhost-scsi device can be used as boot device?
>>    I tested with your config + 3.10 rc6 + seabios 1.7.2.2,but failed.
>>    Could you give me some advise to debug this problem ? I can provide more information if need.
>
> Boot from vhost-scsi is supposed to work. The seabios you used should be
> fine which contains the fixes for vhost-scsi.
>
> Instead of playing with the /sys/kernel/config/target directly, I really
> recommend using targetcli utils.
>
> Nab, I think we really should write some docs for people to use
> vhost-scsi.

   A section in qemu-options.hx would be great, currently an example is
good enough to me.

>
> This is how I install and use targetcli in RHEL6. Note you need upstream
> kernel and qemu bits for vhost-scsi.
>
> # yum groupinstall  'Development tools'
> # yum install python-devel epydoc python-simpleparse
>
> # git clone git://github.com/agrover/rtslib-fb.git
> # git clone git://github.com/agrover/targetcli-fb.git
> # git clone git://github.com/agrover/configshell-fb.git
> # for i in rtslib-fb configshell-fb targetcli-fb; do
>    	make -C $i rpm
>    	yum localinstall $i/dist/*.noarch.rpm
>    done
>
> In targetcli, create a backstore and vhost wwpn, e.g.
> # targetcli
> /> /backstores/ramdisk create r0 1g
> /> /vhost create
> /> cd /vhost/naa.500140527cb6616b/tpg1/luns
> /> create /backstores/ramdisk/r0
>
> # qemu -device vhost-scsi-pci,wwpn=naa.500140527cb6616b ...
>
> Hope this helps.
>
>> Regards,
>> baiqing
>>
>>> -----Original Message-----
>>> From: qemu-devel-bounces+libaiqing=huawei.com@nongnu.org
>>> [mailto:qemu-devel-bounces+libaiqing=huawei.com@nongnu.org] On
>>> Behalf Of Paolo Bonzini
>>> Sent: Tuesday, May 28, 2013 4:01 PM
>>> To: Wenchao Xia
>>> Cc: asias@redhat.com; qemu-devel@nongnu.org; nab@linux-iscsi.org;
>>> Michael S. Tsirkin
>>> Subject: Re: [Qemu-devel] [PATCH 6/9] vhost-scsi: new device supporting the
>>> tcm_vhost Linux kernel module
>>>
>>> Il 28/05/2013 09:13, Wenchao Xia ha scritto:
>>>>>> From: Nicholas Bellinger <nab@linux-iscsi.org>
>>>>>>
>>>>>> The WWPN specified in configfs is passed to "-device vhost-scsi-pci".
>>>>>> The tgpt field of the SET_ENDPOINT ioctl is obsolete now, so it is not
>>>>>> available from the QEMU command-line.  Instead, I hardcode it to
>>> zero.
>>>>>>
>>>> Hi, Paolo
>>>>    Any document about how to config it correctly in configfs, before
>>>> invoking qemu with the WWPN number?
>>>
>>> Unfortunately no, but vhost-scsi doesn't have many knobs (unlike
>>> iSCSI for example) so it's quite simple.  Here is an example:
>>>
>>> cd /sys/kernel/config/target
>>> mkdir -p core/fileio_0/fileio
>>> echo 'fd_dev_name=/home/pbonzini/test.img,fd_dev_size=5905580032' >
>>> core/fileio_0/fileio/control
>>> echo 1 > core/fileio_0/fileio/enable
>>> mkdir -p vhost/naa.600140554cf3a18e/tpgt_0/lun/lun_0
>>> cd vhost/naa.600140554cf3a18e/tpgt_0
>>> ln -sf ../../../../../core/fileio_0/fileio/ lun/lun_0/virtual_scsi_port
>>> echo naa.60014053226f0388 > nexus
>>>
>>> The "nexus" value is the initiator WWN.  naa.600140554cf3a18e is the
>>> target WWN that you have to pass to "-device vhost-scsi-pci".
>>>
>>> Paolo
>>
>


-- 
Best Regards

Wenchao Xia