From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752867AbcKHN5G (ORCPT ); Tue, 8 Nov 2016 08:57:06 -0500 Received: from foss.arm.com ([217.140.101.70]:60466 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752768AbcKHN4n (ORCPT ); Tue, 8 Nov 2016 08:56:43 -0500 From: Suzuki K Poulose 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 Subject: [PATCH v3 0/2] arm64: Support systems without FP/ASIMD Date: Tue, 8 Nov 2016 13:56:19 +0000 Message-Id: <1478613381-5718-1-git-send-email-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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