From patchwork Mon May 13 06:28:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongjiu Geng X-Patchwork-Id: 10940361 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2D7CE924 for ; Mon, 13 May 2019 06:32:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1EF27212D6 for ; Mon, 13 May 2019 06:32:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1251F223B3; Mon, 13 May 2019 06:32:42 +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=-7.9 required=2.0 tests=BAYES_00,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 A61CD212D6 for ; Mon, 13 May 2019 06:32:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727230AbfEMGcL (ORCPT ); Mon, 13 May 2019 02:32:11 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:7630 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725920AbfEMGcL (ORCPT ); Mon, 13 May 2019 02:32:11 -0400 Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 4339F9940403AE8FA378; Mon, 13 May 2019 14:32:09 +0800 (CST) Received: from ros.huawei.com (10.143.28.118) by DGGEMS410-HUB.china.huawei.com (10.3.19.210) with Microsoft SMTP Server id 14.3.439.0; Mon, 13 May 2019 14:32:00 +0800 From: Dongjiu Geng To: , , , , , , , , , , , , CC: , Subject: [RFC PATCH V2] kvm: arm64: export memory error recovery capability to user space Date: Sun, 12 May 2019 23:28:37 -0700 Message-ID: <1557728917-49079-1-git-send-email-gengdongjiu@huawei.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.143.28.118] X-CFilter-Loop: Reflected Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When user space do memory recovery, it will check whether KVM and guest support the error recovery, only when both of them support, user space will do the error recovery. This patch exports this capability of KVM to user space. Cc: Peter Maydell Signed-off-by: Dongjiu Geng --- v1->v2: 1. check whether host support memory failure instead of RAS capability https://patchwork.kernel.org/patch/10730827/ v1: 1. User space needs to check this capability of host is suggested by Peter[1], this patch as RFC tag because user space patches are still under review, so this kernel patch is firstly sent out for review. [1]: https://patchwork.codeaurora.org/patch/652261/ --- Documentation/virtual/kvm/api.txt | 9 +++++++++ arch/arm64/kvm/reset.c | 3 +++ include/uapi/linux/kvm.h | 1 + 3 files changed, 13 insertions(+) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index cd209f7..822a57b 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -4895,3 +4895,12 @@ Architectures: x86 This capability indicates that KVM supports paravirtualized Hyper-V IPI send hypercalls: HvCallSendSyntheticClusterIpi, HvCallSendSyntheticClusterIpiEx. + +8.21 KVM_CAP_ARM_MEMORY_ERROR_RECOVERY + +Architectures: arm, arm64 + +This capability indicates that guest memory error can be detected by the host which +supports the error recovery. When user space do recovery, such as QEMU, it will +check whether host and guest all support memory error recovery, only when both of them +support, user space will do the error recovery. diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index b72a3dd..b6e3986 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -84,6 +84,9 @@ int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_ARM_INJECT_SERROR_ESR: r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN); break; + case KVM_CAP_ARM_MEMORY_ERROR_RECOVERY: + r= IS_ENABLED(CONFIG_MEMORY_FAILURE); + 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 2b7a652..3b19580 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -975,6 +975,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_HYPERV_ENLIGHTENED_VMCS 163 #define KVM_CAP_EXCEPTION_PAYLOAD 164 #define KVM_CAP_ARM_VM_IPA_SIZE 165 +#define KVM_CAP_ARM_MEMORY_ERROR_RECOVERY 166 #ifdef KVM_CAP_IRQ_ROUTING