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From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, ard.biesheuvel@linaro.org,
	will.deacon@arm.com, catalin.marinas@arm.com,
	mark.rutland@arm.com, marc.zyngier@arm.com,
	kvmarm@lists.cs.columbia.edu,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v3 0/2] arm64: Support systems without FP/ASIMD
Date: Tue,  8 Nov 2016 13:56:19 +0000	[thread overview]
Message-ID: <1478613381-5718-1-git-send-email-suzuki.poulose@arm.com> (raw)

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 ).

Changes since V2:
 - Dropped cleanup patch for arm64/crypto/aes-ce-ccm-glue.c
 - Removed static_key check from cpus_have_cap. All users with
   constant caps should use the new API to make use of static_keys.
 - Removed a dedicated static_key used in irqchip-gic-v3.c for
   Cavium errata with the new API.

Applies on v4.9-rc4 + [1] (which is pushed for rc5)

[1] http://marc.info/?l=linux-arm-kernel&m=147819889813214&w=2


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

 arch/arm64/include/asm/cpucaps.h    |  3 ++-
 arch/arm64/include/asm/cpufeature.h | 24 +++++++++++++++++-------
 arch/arm64/include/asm/neon.h       |  3 ++-
 arch/arm64/kernel/cpufeature.c      | 17 ++++++++++++++++-
 arch/arm64/kernel/fpsimd.c          | 14 ++++++++++++++
 arch/arm64/kernel/process.c         |  2 +-
 arch/arm64/kvm/handle_exit.c        | 11 +++++++++++
 arch/arm64/kvm/hyp/hyp-entry.S      |  9 ++++++++-
 arch/arm64/kvm/hyp/switch.c         |  5 ++++-
 drivers/irqchip/irq-gic-v3.c        | 13 +------------
 10 files changed, 76 insertions(+), 25 deletions(-)

-- 
2.7.4

             reply	other threads:[~2016-11-08 13:57 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-08 13:56 Suzuki K Poulose [this message]
2016-11-08 13:56 ` [PATCH v3 1/2] arm64: Add hypervisor safe helper for checking constant capabilities Suzuki K Poulose
2016-11-08 18:11   ` Will Deacon
2016-11-08 13:56 ` [PATCH v3 2/2] arm64: Support systems without FP/ASIMD Suzuki K Poulose
2016-11-14 11:48   ` Catalin Marinas
2016-11-15 10:42     ` Suzuki K Poulose
2016-11-11 13:41 ` [PATCH v3 0/2] " Marc Zyngier
2016-11-14 11:08   ` Catalin Marinas
2016-11-16 18:11 ` Catalin Marinas

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