From patchwork Mon Jun 26 12:45:43 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongjiu Geng X-Patchwork-Id: 9809435 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 6B51360209 for ; Mon, 26 Jun 2017 12:25:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6ECCA2623D for ; Mon, 26 Jun 2017 12:25:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6283528582; Mon, 26 Jun 2017 12:25:23 +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=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id ED2612623D for ; Mon, 26 Jun 2017 12:25:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=QKVhSHRAjjofNDBRCkQrVqbvlPMtTaXqWrnzumiHAcM=; b=EVEMf/uZ5NWPmB srWw/1ilc372o7WQiUK7v/AwoTcmP+OCuvDeXy0zQ3/M3Tr5iuzEucTCvH6x0RtnXKWMytarDxoeC 85ZIxVyN7wjIpMSNSQoTlR3p+HxnfKSM2za/CPqdwnRBKuBFRhRA8Upef5hPKuWF3laFs975BT5W+ evaIM/UdFqaxeHwasxDBG3eSLtIZbLDqdr0Qm+ECljvAQm8Zl+Qs0Nl9ETdNPIfh6UhJQVqqYA8zP DGWmTzb5kXrl839jio3YZ4ue12fsOVVDIpXHV7ju2MHyVyxqbvcGetshNaCnr/9idkKvoehqTorUm ZZVhQihhv3gZemYaWsDw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dPT4y-0000ZA-FZ; Mon, 26 Jun 2017 12:25:20 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dPT4u-0007lP-O8 for linux-arm-kernel@lists.infradead.org; Mon, 26 Jun 2017 12:25:18 +0000 Received: from 172.30.72.55 (EHLO DGGEML401-HUB.china.huawei.com) ([172.30.72.55]) by dggrg02-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id AQA40913; Mon, 26 Jun 2017 20:23:56 +0800 (CST) Received: from linux.huawei.com (10.67.187.203) by DGGEML401-HUB.china.huawei.com (10.3.17.32) with Microsoft SMTP Server id 14.3.301.0; Mon, 26 Jun 2017 20:23:48 +0800 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170626_052517_164908_BF1DE99B X-CRM114-Status: UNSURE ( 7.76 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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