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Re: [Qemu-devel] [PATCH 6/9] vhost-scsi: new device supporting the tcm_v

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 6/9] vhost-scsi: new device supporting the tcm_vhost Linux kernel module
Date: Tue, 28 May 2013 10:01:14 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

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 The tgpt field of the SET_ENDPOINT ioctl is obsolete now, so it is not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' > 
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".


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