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.
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....@nongnu.org
> > [mailto:qemu-devel-bounces+libaiqing=huawei....@nongnu.org] On
> > Behalf Of Paolo Bonzini
> > Sent: Tuesday, May 28, 2013 4:01 PM
> > To: Wenchao Xia
> > Cc: as...@redhat.com; qemu-devel@nongnu.org; n...@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 <n...@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 The tgpt field of the SET_ENDPOINT ioctl is obsolete now, so it is not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
>
--
Asias
