From nobody Mon Feb 9 20:46:22 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=arm.com ARC-Seal: i=1; a=rsa-sha256; t=1612533744; cv=none; d=zohomail.com; s=zohoarc; b=kczXz+8qj8KsGs9VkcuLd0g4tqjuwJN1Sv+bX6w0RWJtS+iLP2fL/xayWnzxQwy/ERNj4VyvKcDmOR796FS9Nv4R40GSNPCRGe7ij6o9A45sQ5llXW3omPk18Cfbb/CJazYE4eMx/ir6KxjtIYVcThJSxQ4l/TYe20AOwFOfxOs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1612533744; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=39JQ3Jas/6M6jJTOc9ucMGzwNIzz4rY4dHYI6kP/420=; b=Y4dOLOTJ+B8a8ZPICMdTV1z1XJFhOcjV/UMnWU1FujSqF+bfMk8dsphkDRBlYhduYBmbWkDpwybcqvkBQ1KPsMleTDTgEvN0cyAiRYyEzvMCZOw6Ptfb1KGmZWj3bteoFYF7goiLAOvql1PB0xF/dCllYhzE4pdMghFjKjcmjMI= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1612533744296919.4147870939036; Fri, 5 Feb 2021 06:02:24 -0800 (PST) Received: from localhost ([::1]:57336 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l81gj-0002WS-E6 for importer@patchew.org; Fri, 05 Feb 2021 09:02:21 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:60778) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l81d7-00078q-2R for qemu-devel@nongnu.org; Fri, 05 Feb 2021 08:58:37 -0500 Received: from foss.arm.com ([217.140.110.172]:53098) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l81d5-00079C-7n for qemu-devel@nongnu.org; Fri, 05 Feb 2021 08:58:36 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 41FCB1435; Fri, 5 Feb 2021 05:58:34 -0800 (PST) Received: from e112269-lin.arm.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 657F33F719; Fri, 5 Feb 2021 05:58:31 -0800 (PST) From: Steven Price To: Catalin Marinas , Marc Zyngier , Will Deacon Subject: [PATCH v8 4/5] arm64: kvm: Expose KVM_ARM_CAP_MTE Date: Fri, 5 Feb 2021 13:58:02 +0000 Message-Id: <20210205135803.48321-5-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210205135803.48321-1-steven.price@arm.com> References: <20210205135803.48321-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=217.140.110.172; envelope-from=steven.price@arm.com; helo=foss.arm.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Peter Maydell , "Dr. David Alan Gilbert" , Andrew Jones , Haibo Xu , Suzuki K Poulose , qemu-devel@nongnu.org, Dave Martin , Juan Quintela , Richard Henderson , linux-kernel@vger.kernel.org, Steven Price , James Morse , Julien Thierry , Thomas Gleixner , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" It's now safe for the VMM to enable MTE in a guest, so expose the capability to user space. Signed-off-by: Steven Price --- arch/arm64/kvm/arm.c | 9 +++++++++ arch/arm64/kvm/sys_regs.c | 3 +++ 2 files changed, 12 insertions(+) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 3783082148bc..c55b7db8639c 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -97,6 +97,12 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm, r =3D 0; kvm->arch.return_nisv_io_abort_to_user =3D true; break; + case KVM_CAP_ARM_MTE: + if (!system_supports_mte() || kvm->created_vcpus) + return -EINVAL; + r =3D 0; + kvm->arch.mte_enabled =3D true; + break; default: r =3D -EINVAL; break; @@ -238,6 +244,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long = ext) */ r =3D 1; break; + case KVM_CAP_ARM_MTE: + r =3D system_supports_mte(); + break; case KVM_CAP_STEAL_TIME: r =3D kvm_arm_pvtime_supported(); break; diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index e6d3e44d19b7..3f7013efd7e4 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1285,6 +1285,9 @@ static bool access_ccsidr(struct kvm_vcpu *vcpu, stru= ct sys_reg_params *p, static unsigned int mte_visibility(const struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd) { + if (kvm_has_mte(vcpu->kvm)) + return 0; + return REG_HIDDEN; } =20 --=20 2.20.1