Re: [Xen-devel] [Qemu-devel] Question about scsi emulation

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 24 Mar 2015, Juergen Gross wrote:
> On 03/24/2015 01:20 AM, Yaoli Zheng wrote:
> > Thank you for the advice!
> > It will be grateful if someone can provide any guide how to config  MegaSAS
> > HBA or how to use xen pvscsi in XEN.
> > There seems no option in XEN for these two driver emulation and no document
> > found online.
> 
> The pvscsi driver is rather new in the Linux kernel. Support for pvscsi
> in Xen tools (xl) is just being worked on:
> 
> http://lists.xen.org/archives/html/xen-devel/2015-03/msg00030.html
> 

Regarding MegaSAS, it should be just a matter of passing the right
command line arguments to QEMU so that it will emulate it, same as for
QEMU without Xen. You can use device_model_args in the VM config file to
pass custom command line arguments from xl to QEMU.


> > 
> > Thanks!
> > 
> > -----Original Message-----
> > From: Stefano Stabellini [mailto:stefano.stabellini@xxxxxxxxxxxxx]
> > Sent: Monday, March 23, 2015 11:18 AM
> > To: Stefan Hajnoczi
> > Cc: Yaoli Zheng; qemu-devel@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] [Qemu-devel] Question about scsi emulation
> > 
> > On Mon, 23 Mar 2015, Stefan Hajnoczi wrote:
> > > On Wed, Mar 18, 2015 at 02:16:47PM -0700, Yaoli Zheng wrote:
> > > > We have problem using qemu emulated scsi driver(the old lsi). Wonder if
> > > > any of other device model we can try for emulating scsi, and how we can
> > > > get and config it in Xen? Having been told virtio-scsi is alternative
> > > > one, but have no idea how to get it work in Xen.
> > > 
> > > The MegaSAS HBA might be another option.  Not sure whether MegaSAS or
> > > virtio-scsi are supported under Xen though.
> > 
> > Making MegaSAS HBA work on Xen should be easy.
> > 
> > Rather than virtio-scsi I would consider the new Xen pvscsi frontend/backend
> > drivers, now upstream in Linux (drivers/scsi/xen-scsifront.c and
> > drivers/xen/xen-scsiback.c). Usually Xen PV drivers perform much better than
> > virtio devices on Xen.
> > 
> > That said, probably most things would be better than the old lsi.
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
> > 
> 

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