From nobody Wed Nov 19 22:24:09 2025 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=1618587980; cv=none; d=zohomail.com; s=zohoarc; b=ONSGKgNueRy964WlMusyXsys1I6wcyU8cqUTSPkAeEwy4yTVZKknm9Wzle6hdYM6WdfnvR1klZG5k3Qapud5a/VBw2J2oo3ITBBoSKkJHYgXpwoighrjlhCX0xtfDdsTg+fZJn14lV55almhatr/6lNwdTHgCfxwTjPTzDZztwY= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1618587980; 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=cl4QAs3Y2fHlmp6eHCXOhU9Wnxr15EfkBL18a7INbfg=; b=FMyZwhaV7lBK/NVb8I/plwpjlHalSwLj46qN1h5Rb6JcF2Jy4qq4vwkdOX87zy2HDqFlaeTJHfmZme6PMv3fjfhAW1VQWElifQ2dO2O/6IDRk47POudtGFO6dD7194ZMGW3r+Woy3oU7Xeza/6V5sgRI8J65uiwUCsU5+da3P6Y= 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 1618587980842525.1948563850784; Fri, 16 Apr 2021 08:46:20 -0700 (PDT) Received: from localhost ([::1]:42770 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lXQfj-0007Rg-LJ for importer@patchew.org; Fri, 16 Apr 2021 11:46:19 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35442) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lXQdE-0005ml-Ep for qemu-devel@nongnu.org; Fri, 16 Apr 2021 11:43:44 -0400 Received: from foss.arm.com ([217.140.110.172]:37260) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lXQd6-0005th-9w for qemu-devel@nongnu.org; Fri, 16 Apr 2021 11:43:44 -0400 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 7FC3E11B3; Fri, 16 Apr 2021 08:43:34 -0700 (PDT) Received: from e112269-lin.arm.com (autoplooker.cambridge.arm.com [10.1.194.57]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BA85C3F99C; Fri, 16 Apr 2021 08:43:31 -0700 (PDT) From: Steven Price To: Catalin Marinas , Marc Zyngier , Will Deacon Subject: [PATCH v11 4/6] arm64: kvm: Expose KVM_ARM_CAP_MTE Date: Fri, 16 Apr 2021 16:43:07 +0100 Message-Id: <20210416154309.22129-5-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210416154309.22129-1-steven.price@arm.com> References: <20210416154309.22129-1-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 fc4c95dd2d26..46bf319f6cb7 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -93,6 +93,12 @@ 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; @@ -234,6 +240,9 @@ 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 377ae6efb0ef..46937bfaac8a 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1306,6 +1306,9 @@ 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