Re: kvm PCI assignment & VFIO ramblings
flat view
From: Roedel, Joerg <hidden>
Date: 2011-08-22 12:40:02
Also in:
kvm, qemu-devel
On Mon, Aug 22, 2011 at 06:51:35AM -0400, Avi Kivity wrote:
On 08/22/2011 01:46 PM, Joerg Roedel wrote:quoted
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. Joerg -- AMD Operating System Research Center Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach General Managers: Alberto Bozzo, Andrew Bowd Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632