[PATCH v1 0/4] vfio: report NUMA nodes for device memory

[ankita]

From: Ankit Agrawal <ankita@nvidia.com>

For devices which allow CPU to cache coherently access their memory,
it is sensible to expose such memory as NUMA nodes separate from
the sysmem node. Qemu currently do not provide a mechanism for creation
of NUMA nodes associated with a vfio-pci device.

Implement a mechanism to create and associate a set of unique NUMA nodes
with a vfio-pci device.

NUMA node is created by inserting a series of the unique proximity
domains (PXM) in the VM SRAT ACPI table. The ACPI tables are read once
at the time of bootup by the kernel to determine the NUMA configuration
and is inflexible post that. Hence this feature is incompatible with
device hotplug. The added node range associated with the device is
communicated through ACPI DSD and can be fetched by the VM kernel or
kernel modules. QEMU's VM SRAT and DSD builder code is modified
accordingly.

New command line params are introduced for admin to have a control on
the NUMA node assignment.

It is expected for a vfio-pci driver to expose this feature through
sysfs. Presence of the feature is checked to enable these code changes.

Applied over v8.1.0-rc4.

Ankit Agrawal (4):
  vfio: new command line params for device memory NUMA nodes
  vfio: assign default values to node params
  hw/arm/virt-acpi-build: patch guest SRAT for NUMA nodes
  acpi/gpex: patch guest DSDT for dev mem information

 hw/arm/virt-acpi-build.c    |  54 +++++++++++++
 hw/pci-host/gpex-acpi.c     |  69 +++++++++++++++++
 hw/vfio/pci.c               | 146 ++++++++++++++++++++++++++++++++++++
 hw/vfio/pci.h               |   2 +
 include/hw/pci/pci_device.h |   3 +
 5 files changed, 274 insertions(+)

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2.17.1