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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).

** Affects: linux (Ubuntu)
     Importance: Wishlist
         Status: Triaged

** Tags: intel intel-virt-19.04
KVM CLX ACPI HMAT table support
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