Re: vfio: missing patch in linux 3.6

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On Thu, 2012-10-04 at 18:14 +0200, Roedel, Joerg wrote:
> On Thu, Oct 04, 2012 at 09:26:39AM -0600, Alex Williamson wrote:
> > On Thu, 2012-10-04 at 17:13 +0200, Andreas Hartmann wrote:
> > > Hello Alex,
> > > 
> > > I just tested vfio as part of linux 3.6 and detected, that it doesn't
> > > work because of the following missing patch:
> > > 
> > > http://news.gmane.org/find-root.php?group=gmane.linux.kernel.pci&article=16422
> > > 
> > > Could you please get it applied for the next stable release?
> > 
> > Hi Andreas,
> > 
> > This patch needs to go through Bjorn's PCI tree, but as noted in the
> > comments I have some outstanding questions that need to be answered,
> > probably by Joerg.  Thanks,
> 
> What are the open questions? I have confirmation from the hardware
> people that the south bridges are peer-2-peer safe. Other questions?

Hi Joerg,

There are a couple questions in the link above.  Since the devices don't
expose a PCIe capability, we probably need to add a check to look at the
upstream device and verify we're not on a legacy bus where ACS can't be
enforced.  Then there's the general question of whether the confirmation
of no peer-to-peer applies to every case where we might see this device
(some of them seem to have history that pre-dates this specific package
implementation) or do we need to try to identify specific package
properties in addition to just a device ID?  Thanks,

Alex

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