[Xen-devel] [PATCH 0/4] [HVM] NUMA support in HVM guests

["Andre Przywara" <andre.przywara@xxxxxxx>]

Hi,

these four patches allow to forward NUMA characteristics into HVM
guests. This works by allocating memory explicitly from different NUMA 
nodes and create an appropriate SRAT-ACPI table which describes the 
topology. Needs a decent guest kernel which uses the SRAT table to 
discover the NUMA topology.
This allows to break the current de-facto limitation of guests to one 
NUMA node, one can use more memory and/or more VCPUs than there are 
available on one node.
        Patch 1/4: introduce numanodes=n config file option.
this states how many NUMA nodes the guest should see, the default 	is 0, 
which means to turn off most parts of the code.
	Patch 2/4: introduce CPU affinity for allocate_physmap call. currently 
the correct NUMA node to take the memory from is chosen by simply using 
the currently scheduled CPU, this patch allows to explicitly specify a 
CPU and provides XENMEM_DEFAULT_CPU for the old behavior
        Patch 3/4: allocate memory with NUMA in mind.
actually look at the numanodes=n option to split the memory request up
into n parts and allocate it from different nodes. Also change the VCPUs
affinity to match the nodes.
        Patch 4/4: inject created SRAT table into the guest.
create a SRAT table, fill it up with the desired NUMA topology and
inject it into the guest

Applies against staging c/s #15719.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>

Regards,
Andre.

--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 277-84917
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