From patchwork Mon Jun 25 20:58:29 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongjiu Geng X-Patchwork-Id: 10485953 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 48EAF60230 for ; Mon, 25 Jun 2018 12:54:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 32DBF28833 for ; Mon, 25 Jun 2018 12:54:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 267D22883D; Mon, 25 Jun 2018 12:54:05 +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=unavailable 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 C17FE28833 for ; Mon, 25 Jun 2018 12:54:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755440AbeFYMxe (ORCPT ); Mon, 25 Jun 2018 08:53:34 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:8730 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752109AbeFYMxd (ORCPT ); Mon, 25 Jun 2018 08:53:33 -0400 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 7B1A0EAEB14F7; Mon, 25 Jun 2018 20:53:17 +0800 (CST) Received: from localhost.localdomain (10.143.28.90) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.382.0; Mon, 25 Jun 2018 20:53:12 +0800 From: Dongjiu Geng To: , , , , , , , , , , , , , Subject: [PATCH v5 2/2] arm64: KVM: export the capability to set guest SError syndrome Date: Tue, 26 Jun 2018 04:58:29 +0800 Message-ID: <1529960309-2513-3-git-send-email-gengdongjiu@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1529960309-2513-1-git-send-email-gengdongjiu@huawei.com> References: <1529960309-2513-1-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 3732097..86b3808 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -4628,3 +4628,14 @@ 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 f7a80dc..20e919a 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: case KVM_CAP_VCPU_EVENTS: 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