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

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Message-Id: <200903091142.06628.sheng.yang@intel.com>
Date:	Mon, 9 Mar 2009 11:42:05 +0800
From:	"Yang, Sheng" <sheng.yang@...el.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Matthew Wilcox <matthew@....cx>, "Zhao, Yu" <yu.zhao@...el.com>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 0/7] PCI: Linux kernel SR-IOV support

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
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