Deprecation of x86-64-v1 and x86-64-v2 x86_64 microarchitecture CPUs in RHEL9 / x86-64-v3 is required by RHEL10

Environment

• Red Hat Enterprise Linux (RHEL) 8, 9 and 10
• x86 architecture

Issue

• Red Hat will upgrade the instruction set architecture (ISA) baseline to the x86-64-v3 microarchitecture level in RHEL 10 and x86-64-v1 and x86-64-v2 x86-64 microarchitecture level of CPUs will be marked deprecated in RHEL 8 and RHEL 9 and unsupported in RHEL 10.

Resolution

• Related to RHEL 8 this is just a warning to provide time to do the needed changes to be able to run RHEL 10.
• Related to RHEL 9 this is something to investigate further. RHEL 9 can run on hardware that supports x86-64-v2 but can't run on x86-64-v1 hardware.
• Related to RHEL10, as pointed out by This content is not included.Considerations in adopting RHEL 10, RHEL10 running on x86 hardware requires the features of the x86-64-v3 specification.

Root Cause

• On a VM this warning is an indication of the underlying virtualization platform not supporting the x86-64-v3 microarchitecture level. It can be either the virtual hardware needing a newer version or the version of the virtualization platform not supporting all needed features.
• On a physical system either your CPU just does not support the x86-64-v3 microarchitecture or certain features required by it are disabled in BIOS/UEFI
• This content is not included.Exploring x86-64-v3 for Red Hat Enterprise Linux 10 contains more info on what's happening and why.

Diagnostic Steps

Run this command on RHEL 8 or later to find the microarchitecture level of the processor:

# /usr/lib64/ld-linux-x86-64.so.2 --help

For example, on a Core i7-11850H it will show this:

Shared library search path:
  (libraries located via /etc/ld.so.cache)
  /lib64 (system search path)
  /usr/lib64 (system search path)

Subdirectories of glibc-hwcaps directories, in priority order:
  x86-64-v4 (supported, searched)
  x86-64-v3 (supported, searched)
  x86-64-v2 (supported, searched)

Legacy HWCAP subdirectories under library search path directories:
  haswell (AT_PLATFORM; supported, searched)
  tls (supported, searched)
  avx512_1 (supported, searched)
  x86_64 (supported, searched)

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