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 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
