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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/30428] New AMD cache size computation logic does
 not work for some CPUs, hypervisors
Date: Thu, 14 Sep 2023 20:48:36 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30428

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.39

--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for 2.39 via:

commit dcad5c8578130dec7f35fd5b0885304b59f9f543
Author: Sajan Karumanchi <sajan.karumanchi@amd.com>
Date:   Tue Aug 1 15:20:55 2023 +0000

    x86: Fix for cache computation on AMD legacy cpus.

    Some legacy AMD CPUs and hypervisors have the _cpuid_ '0x8000_001D'
    set to Zero, thus resulting in zeroed-out computed cache values.
    This patch reintroduces the old way of cache computation as a
    fail-safe option to handle these exceptions.
    Fixed 'level4_cache_size' value through handle_amd().

    Reviewed-by: Premachandra Mallappa <premachandra.mallappa@amd.com>
    Tested-by: Florian Weimer <fweimer@redhat.com>

It seems that we are still missing the backport to 2.37.

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