On Tue, Nov 08, 2016 at 05:35:38PM +0530, Shivaprasad G Bhat wrote:
This patch addresses the same aspects on PPC the bug 1103314 addressed on x86.
PCI expander bus creates multiple primary PCI busses, where each of these busses can be assigned a specific NUMA affinity, which, on x86 is advertised through ACPI on a per-bus basis.
For SPAPR, a PHB's NUMA affinities are assigned on a per-PHB basis, and there is no mechanism for advertising NUMA affinities to a guest on a per-bus basis. So, even if qemu-ppc manages to get some sort of multi-bus topology working using PXB, there is no way to expose the affinities of these busses to the guest. It can only be exposed on a per-PHB/per-domain basis.
So, enable NUMA node tag in pci-root controller on PPC.
That doesn't really solve the bug above properly - your solution here only works if all the PCI devices (whether emulated or host-assigned) are to be associated with the same guest NUMA node. This is a pretty restrictive setup and so of limited use IMHO. It seems like to solve this requires that we create multiple PCI Host Bridges ? Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://entangle-photo.org -o- http://search.cpan.org/~danberr/ :|