Re: [Xen-devel] RE: SR-IOV for pv_ops dom0

[Qing He <qing.he@xxxxxxxxx>]

On Sun, 2009-09-27 at 17:47 +0800, Pasi Kärkkäinen wrote:
> On Sun, Sep 27, 2009 at 11:02:38AM +0800, Qing He wrote:
> > On Sat, 2009-09-26 at 19:06 +0800, Pasi Kärkkäinen wrote:
> > > Hello,
> > > 
> > > Is pv_ops dom0 (xen/master) currently ready for SR-IOV, or are
> > > additional patches still needed? 
> > > 
> > 
> > VFs can be created and assigned to HVM domains, we've tested that. But
> > assigning VFs to PV domains doesn't work since the support isn't
> > complete (at least MSI, I'm not sure about the status of INTx device).
> > 
> 
> Ok. Do you know if anyone is working on adding those missing bits? 
> Is it missing only from domU kernel, or also from Xen hypervisor PV code?

Hypervisor has the proper code, and old 2.6.18 based domU works well.
It's just pv_ops based domU lacking this feature. Traditionally, domU
doesn't have sufficient privilege but relies on dom0 to do certain
things, this kind of delegation requires some special handling and
is still subjected to more thinking.

> 
> Also, what kernel you used in the HVM guest for SR-IOV? Just so I can
> try this myself some day.. :)

The kernel version is not important, just need the driver of VFs, like
igbvf.

> 
> > > Can upstream/vanilla 2.6.31 be used as PV guest and run the VF driver?
> > > Or does it need additional patches?
> > 
> > Vanilla kernel doesn't have pirq and msi-x related code, so VF doesn't
> > work there either.
> > 
> 
> Ok. Do you know if this is being worked on?

Yes, but that's likely to take quite a long time to eventually get
everything in.

Thanks,
Qing

> 
> Thanks for the replies!
> 
> -- Pasi
> 

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