linux-kernel - [PATCH v2 0/3] arm64: Support systems without FP/ASIMD

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Date:   Mon, 31 Oct 2016 16:03:42 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        christoffer.dall@...aro.org, catalin.marinas@....com,
        will.deacon@....com, mark.rutland@....com, marc.zyngier@....com,
        ard.biesheuvel@...aro.org,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 0/3] arm64: Support systems without FP/ASIMD

This series adds supports to the kernel and KVM hyp to handle
systems without FP/ASIMD properly. At the moment the kernel
doesn't check if the FP unit is available before accessing
the registers (e.g during context switch). Also for KVM,
we trap the FP/ASIMD accesses and handle it by injecting an
undefined instruction into the VM on systems without FP.

Tested on a FVP_Base-AEM-v8A model by disabling VFP on at
least one CPU ( -C clusterX.cpuY.vfp-present=0 ).

Applies on aarch64 : for-next/core


Suzuki K Poulose (3):
  arm64: crypto/aes-ce-ccm: Cleanup hwcap check
  arm64: Add hypervisor safe helper for checking constant capabilities
  arm64: Support systems without FP/ASIMD

 arch/arm64/crypto/aes-ce-ccm-glue.c |  5 ++---
 arch/arm64/include/asm/cpufeature.h | 24 ++++++++++++++++++++----
 arch/arm64/include/asm/neon.h       |  3 ++-
 arch/arm64/kernel/cpufeature.c      | 15 +++++++++++++++
 arch/arm64/kernel/fpsimd.c          | 14 ++++++++++++++
 arch/arm64/kvm/handle_exit.c        | 11 +++++++++++
 arch/arm64/kvm/hyp/hyp-entry.S      |  9 ++++++++-
 arch/arm64/kvm/hyp/switch.c         |  5 ++++-
 8 files changed, 76 insertions(+), 10 deletions(-)

-- 
2.7.4