From patchwork Thu May 31 13:08:58 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongjiu Geng X-Patchwork-Id: 10440275 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2B108601E9 for ; Thu, 31 May 2018 05:03:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1C33C293C8 for ; Thu, 31 May 2018 05:03:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0EC9D29483; Thu, 31 May 2018 05:03:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=2.0 tests=BAYES_00, DATE_IN_FUTURE_06_12, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A377E293C8 for ; Thu, 31 May 2018 05:03:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753953AbeEaFDp (ORCPT ); Thu, 31 May 2018 01:03:45 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:52211 "EHLO huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753896AbeEaFDl (ORCPT ); Thu, 31 May 2018 01:03:41 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 60EDF590F0056; Thu, 31 May 2018 13:03:36 +0800 (CST) Received: from localhost.localdomain (10.143.28.90) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.382.0; Thu, 31 May 2018 13:03:31 +0800 From: Dongjiu Geng To: , , , , , , , , , , , , , Subject: [PATCH v1 1/2] arm64: KVM: export the capability to set guest SError syndrome Date: Thu, 31 May 2018 21:08:58 +0800 Message-ID: <1527772139-19665-2-git-send-email-gengdongjiu@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1527772139-19665-1-git-send-email-gengdongjiu@huawei.com> References: <1527772139-19665-1-git-send-email-gengdongjiu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.143.28.90] X-CFilter-Loop: Reflected Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP For the arm64 RAS Extension, user space can inject a virtual-SError with specified ESR. So user space needs to know whether KVM support to inject such SError, this interface adds this query for this capability. KVM will check whether system support RAS Extension, if supported, KVM returns true to user space, otherwise returns false. Signed-off-by: Dongjiu Geng Reviewed-by: James Morse --- Documentation/virtual/kvm/api.txt | 11 +++++++++++ arch/arm64/kvm/reset.c | 3 +++ include/uapi/linux/kvm.h | 1 + 3 files changed, 15 insertions(+) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 758bf40..fdac969 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -4603,3 +4603,14 @@ Architectures: s390 This capability indicates that kvm will implement the interfaces to handle reset, migration and nested KVM for branch prediction blocking. The stfle facility 82 should not be provided to the guest without this capability. + +8.14 KVM_CAP_ARM_SET_SERROR_ESR + +Architectures: arm, arm64 + +This capability indicates that userspace can specify the syndrome value reported +to the guest OS when guest takes a virtual SError interrupt exception. +If KVM has this capability, userspace can only specify the ISS field for the ESR +syndrome, it can not specify the EC field which is not under control by KVM. +If this virtual SError is taken to EL1 using AArch64, this value will be reported +in ISS filed of ESR_EL1. diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index 3256b92..38c8a64 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -77,6 +77,9 @@ 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_INJECT_SERROR_ESR: + r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN); + 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 b02c41e..e88f976 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -948,6 +948,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_S390_BPB 152 #define KVM_CAP_GET_MSR_FEATURES 153 #define KVM_CAP_HYPERV_EVENTFD 154 +#define KVM_CAP_ARM_INJECT_SERROR_ESR 155 #ifdef KVM_CAP_IRQ_ROUTING