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Date: Tue, 28 May 2013 10:01:14 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 6/9] vhost-scsi: new device supporting the
 tcm_vhost Linux kernel module
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To: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Cc: asias@redhat.com, qemu-devel@nongnu.org, nab@linux-iscsi.org, "Michael S. Tsirkin" <mst@redhat.com>

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 The tgpt field of the SET_ENDPOINT ioctl is obsolete now, so it is not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