KVM CLX ACPI HMAT table support

[Paul Lai]

ACPI HMAT table support : HMAT is a new ACPI table that records the performance parameter of memory, so MCDRAM (or next gen HBM2) can be described well by this table. We need to support this table in kernel and qemu so that guest can get and parse this table then to find where the high-performance memory is.

Heterogeneous Memory Attribute Table (HMAT) describes the memory attributes, such as memory
 side cache attributes and bandwidth and latency details, related to the System Physical Address
 (SPA) Memory Ranges. The software is expected to use this information as hint for optimization.

HMAT is defined in ACPI 6.2: 5.2.27 Heterogeneous Memory Attribute Table (HMAT).
http://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf
 patches:
http://lists.nongnu.org/archive/html/qemu-devel/2018-06/msg05368.html

[Paul Lai (pclai)]

Upstream target Linux 4.20

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1782212

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]