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

[Juergen Gross <jgross@xxxxxxxx>]

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

Juergen

> 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.
>
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