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

[Wenchao Xia]

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: address@hidden
> > > [mailto:address@hidden On
> > > Behalf Of Paolo Bonzini
> > > Sent: Tuesday, May 28, 2013 4:01 PM
> > > To: Wenchao Xia
> > > Cc: address@hidden; address@hidden; address@hidden;
> > > 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 <address@hidden>
> > > > > >
> > > > > > 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 The tgpt field of the SET_ENDPOINT ioctl is obsolete now, so it is not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