Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752906AbdFZMYh (ORCPT ); Mon, 26 Jun 2017 08:24:37 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:8853 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751974AbdFZMYY (ORCPT ); Mon, 26 Jun 2017 08:24:24 -0400 From: Dongjiu Geng To: , , , , , , , , , , , , , , , , Subject: [PATCH v4 1/3] arm64: kvm: support user space to detect RAS extension feature Date: Mon, 26 Jun 2017 20:45:43 +0800 Message-ID: <1498481143-23183-1-git-send-email-gengdongjiu@huawei.com> X-Mailer: git-send-email 1.7.7 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.187.203] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0207.5950FCDD.0159,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 45a4752d03e9f83d77feaaf55b415da9 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1423 Lines: 52 Handle userspace's detection for RAS extension, because sometimes the userspace needs to know the CPU's capacity Signed-off-by: Dongjiu Geng --- arch/arm64/kvm/reset.c | 11 +++++++++++ include/uapi/linux/kvm.h | 1 + 2 files changed, 12 insertions(+) diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index d9e9697..1004039 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -64,6 +64,14 @@ static bool cpu_has_32bit_el1(void) return !!(pfr0 & 0x20); } +static bool kvm_arm_support_ras_extension(void) +{ + u64 pfr0; + + pfr0 = read_system_reg(SYS_ID_AA64PFR0_EL1); + return !!(pfr0 & 0x10000000); +} + /** * kvm_arch_dev_ioctl_check_extension * @@ -87,6 +95,9 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_ARM_PMU_V3: r = kvm_arm_support_pmu_v3(); break; + case KVM_CAP_ARM_RAS_EXTENSION: + r = kvm_arm_support_ras_extension(); + break; case KVM_CAP_SET_GUEST_DEBUG: case KVM_CAP_VCPU_ATTRIBUTES: r = 1; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index f51d508..27fe556 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -883,6 +883,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_PPC_MMU_RADIX 134 #define KVM_CAP_PPC_MMU_HASH_V3 135 #define KVM_CAP_IMMEDIATE_EXIT 136 +#define KVM_CAP_ARM_RAS_EXTENSION 137 #ifdef KVM_CAP_IRQ_ROUTING -- 2.10.1