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Date: Mon, 22 Aug 2011 15:42:35 +0300
From: Avi Kivity <avi@redhat.com>
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To: "Roedel, Joerg" <Joerg.Roedel@amd.com>
Subject: Re: kvm PCI assignment & VFIO ramblings
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Cc: Alexey Kardashevskiy <aik@au1.ibm.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Paul Mackerras <pmac@au1.ibm.com>, qemu-devel <qemu-devel@nongnu.org>,
	iommu <iommu@lists.linux-foundation.org>, chrisw <chrisw@sous-sol.org>,
	Alex Williamson <alex.williamson@redhat.com>,
	Anthony Liguori <anthony@codemonkey.ws>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
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On 08/22/2011 03:36 PM, Roedel, Joerg wrote:
> On Mon, Aug 22, 2011 at 06:51:35AM -0400, Avi Kivity wrote:
> >  On 08/22/2011 01:46 PM, Joerg Roedel wrote:
> >  >  That does not work. The bridge in question may not even be visible as a
> >  >  PCI device, so you can't link to it. This is the case on a few PCIe
> >  >  cards which only have a PCIx chip and a PCIe-2-PCIx bridge to implement
> >  >  the PCIe interface (yes, I have seen those cards).
> >
> >  How does the kernel detect that devices behind the invisible bridge must
> >  be assigned as a unit?
>
> On the AMD IOMMU side this information is stored in the IVRS ACPI table.
> Not sure about the VT-d side, though.
>

I see.  There is no sysfs node representing it?

I'd rather not add another meaningless identifier.

-- 
error compiling committee.c: too many arguments to function