linux-kernel - [PATCH 0/2] arm64: Support systems without FP/ASIMD

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Date:   Tue, 25 Oct 2016 14:50:31 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, catalin.marinas@....com,
        will.deacon@....com, marc.zyngier@....com,
        christoffer.dall@...aro.org, ard.biesheuvel@...aro.org,
        mark.rutland@....com, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH 0/2] 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 ).

Suzuki K Poulose (2):
  arm64: Add hypervisor safe helper for checking constant capabilities
  arm64: Support systems without FP/ASIMD

 arch/arm64/crypto/aes-ce-ccm-glue.c |  2 +-
 arch/arm64/crypto/aes-ce-cipher.c   |  2 ++
 arch/arm64/crypto/ghash-ce-glue.c   |  2 ++
 arch/arm64/crypto/sha1-ce-glue.c    |  2 ++
 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 ++++-
 11 files changed, 81 insertions(+), 8 deletions(-)

-- 
2.7.4