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Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings
From: |
Joerg Roedel |
Subject: |
Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings |
Date: |
Mon, 22 Aug 2011 12:46:35 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Aug 22, 2011 at 02:30:26AM -0400, Avi Kivity wrote:
> On 08/20/2011 07:51 PM, Alex Williamson wrote:
> > We need to address both the description and enforcement of device
> > groups. Groups are formed any time the iommu does not have resolution
> > between a set of devices. On x86, this typically happens when a
> > PCI-to-PCI bridge exists between the set of devices and the iommu. For
> > Power, partitionable endpoints define a group. Grouping information
> > needs to be exposed for both userspace and kernel internal usage. This
> > will be a sysfs attribute setup by the iommu drivers. Perhaps:
> >
> > # cat /sys/devices/pci0000:00/0000:00:19.0/iommu_group
> > 42
> >
>
> $ readlink /sys/devices/pci0000:00/0000:00:19.0/iommu_group
> ../../../path/to/device/which/represents/the/resource/constraint
>
> (the pci-to-pci bridge on x86, or whatever node represents partitionable
> endpoints on power)
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).
Regards,
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
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, (continued)
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alexander Graf, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alex Williamson, 2011/08/24
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Joerg Roedel, 2011/08/24
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alex Williamson, 2011/08/24
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Roedel, Joerg, 2011/08/25
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, David Gibson, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alex Williamson, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Benjamin Herrenschmidt, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Alexander Graf, 2011/08/23
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Avi Kivity, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings,
Joerg Roedel <=
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Avi Kivity, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Roedel, Joerg, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Avi Kivity, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Roedel, Joerg, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Avi Kivity, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Roedel, Joerg, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Avi Kivity, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Roedel, Joerg, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Benjamin Herrenschmidt, 2011/08/22
- Re: [Qemu-devel] kvm PCI assignment & VFIO ramblings, Joerg Roedel, 2011/08/22