From patchwork Thu Mar 24 11:39:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Elisei X-Patchwork-Id: 12790616 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8E655C4332F for ; Thu, 24 Mar 2022 11:40:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: 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: List-Owner; bh=irMbLUae31Co4+Ngt0wMjXZeV9scgykiu4IjpCxPHd8=; b=g9YWnGKoo9IIXh hdZNZPO6uBohtPBNtgunsOd32inKjKATOg9tzuHNzvOVv9CRwEtssNcDPOWHr0kJGnK73Wnj9iV4X ZuUZN5ObLppcrSCzQZdyc1KGFnLTkoH9ngZYUAe57h3i162yuuTB1YdQFNl/L9U4ELLPMk4jWXC+7 G0QjeyvV121072e3fY+4sTQhOwOOcgPjrXihyjVqa+qQYeLMsfBVme7Z8VelGoU6wjqWBj0mTy2Yg 353/h2ttmD/DEYgyG35Xe/jeUvhs9Za0zOkT32BRgOwpzRDbQXwzhAoTWqDKF93nnk6lZn+j87qtf xMC3p2GH1rICGba0nc/g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nXLoh-00GMRu-7t; Thu, 24 Mar 2022 11:39:47 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nXLoP-00GMPJ-20 for linux-arm-kernel@lists.infradead.org; Thu, 24 Mar 2022 11:39:30 +0000 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 467DD1691; Thu, 24 Mar 2022 04:39:28 -0700 (PDT) Received: from monolith.localdoman (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 639A33F73D; Thu, 24 Mar 2022 04:39:26 -0700 (PDT) From: Alexandru Elisei To: will@kernel.org, julien.thierry.kdev@gmail.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, steven.price@arm.com Subject: [kvmtool PATCH v2 2/2] aarch64: Add support for MTE Date: Thu, 24 Mar 2022 11:39:42 +0000 Message-Id: <20220324113942.24217-3-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220324113942.24217-1-alexandru.elisei@arm.com> References: <20220324113942.24217-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220324_043929_221833_6C9537B8 X-CRM114-Status: GOOD ( 12.52 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org MTE has been supported in Linux since commit 673638f434ee ("KVM: arm64: Expose KVM_ARM_CAP_MTE"), add support for it in kvmtool. MTE is enabled by default. Enabling the MTE capability incurs a cost, both in time (for each translation fault the tags need to be cleared), and in space (the tags need to be saved when a physical page is swapped out). This overhead is expected to be negligible for most users, but for those cases where they matter (like performance benchmarks), a --disable-mte option has been added. Signed-off-by: Alexandru Elisei Reviewed-by: Vladimir Murzin Tested-by: Vladimir Murzin --- arm/aarch32/include/kvm/kvm-arch.h | 3 +++ arm/aarch64/include/kvm/kvm-arch.h | 1 + arm/aarch64/include/kvm/kvm-config-arch.h | 2 ++ arm/aarch64/kvm.c | 23 +++++++++++++++++++++++ arm/include/arm-common/kvm-config-arch.h | 1 + arm/kvm.c | 2 ++ 6 files changed, 32 insertions(+) diff --git a/arm/aarch32/include/kvm/kvm-arch.h b/arm/aarch32/include/kvm/kvm-arch.h index bee2fc255a82..5616b27e257e 100644 --- a/arm/aarch32/include/kvm/kvm-arch.h +++ b/arm/aarch32/include/kvm/kvm-arch.h @@ -5,6 +5,9 @@ #define kvm__arch_get_kern_offset(...) 0x8000 +struct kvm; +static inline void kvm__arch_enable_mte(struct kvm *kvm) {} + #define ARM_MAX_MEMORY(...) ARM_LOMAP_MAX_MEMORY #define MAX_PAGE_SIZE SZ_4K diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h index 5e5ee41211ed..9124f6919d0f 100644 --- a/arm/aarch64/include/kvm/kvm-arch.h +++ b/arm/aarch64/include/kvm/kvm-arch.h @@ -6,6 +6,7 @@ struct kvm; unsigned long long kvm__arch_get_kern_offset(struct kvm *kvm, int fd); int kvm__arch_get_ipa_limit(struct kvm *kvm); +void kvm__arch_enable_mte(struct kvm *kvm); #define ARM_MAX_MEMORY(kvm) ({ \ u64 max_ram; \ diff --git a/arm/aarch64/include/kvm/kvm-config-arch.h b/arm/aarch64/include/kvm/kvm-config-arch.h index 04be43dfa9b2..df4a15ff00a7 100644 --- a/arm/aarch64/include/kvm/kvm-config-arch.h +++ b/arm/aarch64/include/kvm/kvm-config-arch.h @@ -6,6 +6,8 @@ "Run AArch32 guest"), \ OPT_BOOLEAN('\0', "pmu", &(cfg)->has_pmuv3, \ "Create PMUv3 device"), \ + OPT_BOOLEAN('\0', "disable-mte", &(cfg)->mte_disabled, \ + "Disable Memory Tagging Extension capability"), \ OPT_U64('\0', "kaslr-seed", &(cfg)->kaslr_seed, \ "Specify random seed for Kernel Address Space " \ "Layout Randomization (KASLR)"), diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c index 56a0aedc263d..1035171a00f0 100644 --- a/arm/aarch64/kvm.c +++ b/arm/aarch64/kvm.c @@ -81,3 +81,26 @@ int kvm__get_vm_type(struct kvm *kvm) return KVM_VM_TYPE_ARM_IPA_SIZE(ipa_bits); } + +void kvm__arch_enable_mte(struct kvm *kvm) +{ + struct kvm_enable_cap cap = { + .cap = KVM_CAP_ARM_MTE, + }; + + if (kvm->cfg.arch.mte_disabled) { + pr_debug("MTE capability disabled by user"); + return; + } + + if (!kvm__supports_extension(kvm, KVM_CAP_ARM_MTE)) { + kvm->cfg.arch.mte_disabled = true; + pr_debug("MTE capability not present"); + return; + } + + if (ioctl(kvm->vm_fd, KVM_ENABLE_CAP, &cap)) + die_perror("KVM_ENABLE_CAP(KVM_CAP_ARM_MTE)"); + + pr_debug("MTE capability enabled"); +} diff --git a/arm/include/arm-common/kvm-config-arch.h b/arm/include/arm-common/kvm-config-arch.h index 5734c46ab9e6..f2049994d859 100644 --- a/arm/include/arm-common/kvm-config-arch.h +++ b/arm/include/arm-common/kvm-config-arch.h @@ -9,6 +9,7 @@ struct kvm_config_arch { bool virtio_trans_pci; bool aarch32_guest; bool has_pmuv3; + bool mte_disabled; u64 kaslr_seed; enum irqchip_type irqchip; u64 fw_addr; diff --git a/arm/kvm.c b/arm/kvm.c index 80d233f13d0b..c5913000e1ed 100644 --- a/arm/kvm.c +++ b/arm/kvm.c @@ -86,6 +86,8 @@ void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size) /* Create the virtual GIC. */ if (gic__create(kvm, kvm->cfg.arch.irqchip)) die("Failed to create virtual GIC"); + + kvm__arch_enable_mte(kvm); } #define FDT_ALIGN SZ_2M