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NUMA support in HVM guests

Andre Przywara xen-devel 1 version In review

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  1. v1 Latest4 patches 15 repliesIn review

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#Subject and filesSizeRepliesApplied
1/4introduce numanodes=n config file optiontools/python/xen/lowlevel/xc/xc.c tools/python/xen/xend/XendConfig.py tools/python/xen/xend/image.py +3 more+17 -50 replies
2/4introduce CPU affinity for allocate_physmap calltools/ioemu/vl.c tools/libxc/xc_dom_x86.c tools/libxc/xc_domain.c +5 more+23 -99 replies
3/4allocate HVM guest memory with NUMA in mindtools/libxc/xc_hvm_build.c tools/libxc/xenguest.h tools/libxc/xg_private.c +2 more+126 -100 replies
4/4inject created SRAT table into the guesttools/firmware/hvmloader/acpi/acpi2_0.h tools/firmware/hvmloader/acpi/build.c tools/firmware/hvmloader/util.c +1 more+206 -10 replies

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Cover letter [PATCH 0/4] [HVM] NUMA support in HVM guests

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 <[email protected]>

Regards,
Andre.

Signature · 9 lines
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 277-84917
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