linux-kernel - [PATCH v2 0/3] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190412171420.29065-1-julien.grall@arm.com>
Date:   Fri, 12 Apr 2019 18:14:17 +0100
From:   Julien Grall <julien.grall@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will.deacon@....com,
        christoffer.dall@....com, marc.zyngier@....com,
        james.morse@....com, julien.thierry@....com,
        suzuki.poulose@....com, Dave.Martin@....com,
        ard.biesheuvel@...aro.org, Julien Grall <julien.grall@....com>
Subject: [PATCH v2 0/3] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state

Hi all,

This patch series keep softirqs enabled while touching FPSIMD/SVE state. For
more details on the impact see patch #3.

This patch series has been benchmarked on Linux 5.1-rc4 with defconfig.

On Juno2:
    * hackbench 100 process 1000 (10 times)
    * .7% quicker

On ThunderX 2:
    * hackbench 1000 process 1000 (20 times)
    * 3.4% quicker

Note that while the benchmark has been done on 5.1-rc4, the patch series is
based on kvm-arm/next as it has few conflicts with the SVE KVM series.

Cheers,

Julien Grall (3):
  arm64/fpsimd: Remove the prototype for sve_flush_cpu_state()
  arch/arm64: fpsimd: Introduce fpsimd_save_and_flush_cpu_state() and
    use it
  arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state

 arch/arm64/include/asm/fpsimd.h |   6 +-
 arch/arm64/include/asm/simd.h   |   4 +-
 arch/arm64/kernel/fpsimd.c      | 148 +++++++++++++++++++++++++++++-----------
 arch/arm64/kvm/fpsimd.c         |   3 +-
 4 files changed, 112 insertions(+), 49 deletions(-)

-- 
2.11.0