Re: [Qemu-devel] [PATCH 2/3] vhost-scsi: new device supporting the tcm_vhost Linux kernel module

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Mar 28, 2013 at 12:50:21AM +0200, Michael S. Tsirkin wrote:
> On Wed, Mar 27, 2013 at 03:45:42PM -0700, Nicholas A. Bellinger wrote:
> > On Thu, 2013-03-28 at 00:28 +0200, Michael S. Tsirkin wrote:
> > > On Wed, Mar 27, 2013 at 09:59:45PM +0000, Nicholas A. Bellinger wrote:
> > > > From: Paolo Bonzini <pbonzini@redhat.com>
> > > > 
> > > > 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 The tgpt field of the SET_ENDPOINT ioctl is obsolete now, so it is not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.
> > > > 
> > > > Changes in V4:
> > > >    - Set event_idx=off by default (nab, thanks asias)
> > > 
> > > Why? What's going on here?
> > > 
> > 
> > Not disabling event_idx by default, or disabling from the command line
> > ends up resulting in ->handle_kick() not getting called for subsequent
> > commands..
> > 
> > I spent some time trying to track this down recently with no luck, and
> > AFAICT it's always been required in order for vhost-scsi to function.
> 
> Hmm this is a bug in kernel then. A better work-around is
> to disable EVENT_IDX in kernel. Let's do it for 3.9?

But before we do, can you check that SET_FEATURES is
called with this bit set if you enable event_idx?
If not that's your bug then ...

-- 
MST