[Bug build/28704] New: elf/tst-cpu-features-cpuinfo fails for KVM guests on some AMD systems

[Bug build/28704] New: elf/tst-cpu-features-cpuinfo fails for KVM guests on some AMD systems

[aurelien at aurel32 dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=28704

            Bug ID: 28704
           Summary: elf/tst-cpu-features-cpuinfo fails for KVM guests on
                    some AMD systems
           Product: glibc
           Version: 2.35
            Status: NEW
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: aurelien at aurel32 dot net
                CC: carlos at redhat dot com
  Target Milestone: ---

On recent AMD systems with the IBRS feature, elf/tst-cpu-features-cpuinfo fails
for KVM guests, but not on the host. I have tracked that to KVM reporting the
AMD IBRS feature using the AMD Intel one:

Checking HAS_CPU_FEATURE (AMD_IBRS):
  HAS_CPU_FEATURE (AMD_IBRS): 0
  cpuinfo (ibrs): 1

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[Bug build/28704] elf/tst-cpu-features-cpuinfo fails for KVM guests on some AMD systems

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28704

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Aurelien Jarno <aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=94058f6cde8b887178885954740ac6c866d25eab

commit 94058f6cde8b887178885954740ac6c866d25eab
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Wed Dec 15 23:46:19 2021 +0100

    elf: Fix tst-cpu-features-cpuinfo for KVM guests on some AMD systems [BZ
#28704]

    On KVM guests running on some AMD systems, the IBRS feature is reported
    as a synthetic feature using the Intel feature, while the cpuinfo entry
    keeps the same. Handle that by first checking the presence of the Intel
    feature on AMD systems.

    Fixes bug 28704.

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[Bug build/28704] elf/tst-cpu-features-cpuinfo fails for KVM guests on some AMD systems

[aurelien at aurel32 dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=28704

Aurelien Jarno <aurelien at aurel32 dot net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #2 from Aurelien Jarno <aurelien at aurel32 dot net> ---
Fixed in 2.35.

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[Bug build/28704] elf/tst-cpu-features-cpuinfo fails for KVM guests on some AMD systems

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28704

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The release/2.34/master branch has been updated by Aurelien Jarno
<aurel32@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=03de6917bd11c0591867607ce74ef658f76eabb9

commit 03de6917bd11c0591867607ce74ef658f76eabb9
Author: Aurelien Jarno <aurelien@aurel32.net>
Date:   Wed Dec 15 23:46:19 2021 +0100

    elf: Fix tst-cpu-features-cpuinfo for KVM guests on some AMD systems [BZ
#28704]

    On KVM guests running on some AMD systems, the IBRS feature is reported
    as a synthetic feature using the Intel feature, while the cpuinfo entry
    keeps the same. Handle that by first checking the presence of the Intel
    feature on AMD systems.

    Fixes bug 28704.

    (cherry picked from commit 94058f6cde8b887178885954740ac6c866d25eab)

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