Re: [PATCH v10 0/7] PCI: Linux kernel SR-IOV support

Yang, Sheng
2009-03-09T03:42:32Z

On Sunday 08 March 2009 22:30:16 Avi Kivity wrote:
> Matthew Wilcox wrote:
> > On Tue, Feb 24, 2009 at 12:47:38PM +0200, Avi Kivity wrote:
> >> Do those patches allow using a VF on the host (in other words, does the
> >> kernel emulate config space accesses)?
> >
> > SR-IOV hardware handles config space accesses to virtual functions. No
> > kernel changes needed for that aspect of it.
>
> Patches 2 and 3 of the patchset that enables SR/IOV in kvm [1] suggest
> that at the config space is only partially implemented.
>
> [1] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/29034

Hi Avi

For kernel side, patch 2 is not necessary. Because kernel would read VID/DID
directly from pci_dev rather than configuration space, which have been set
properly already.

And very sorry, for the patch 3. We haven't known exactly what's happened. I
think the problem is caused by guest driver, but didn't confirm(and I have
some misunderstandings with ZhaoYu for I thought we are agree on the reason,
but after confirm with him, he didn't agree). I am doing more investigations
to find the real cause.

--
regards
Yang, Sheng