From patchwork Mon May 24 10:45:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 1482709 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4FpYmG1Pm2z9sRK for ; Mon, 24 May 2021 20:46:20 +1000 (AEST) Received: from localhost ([::1]:40436 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ll86D-0004yq-5A for incoming@patchwork.ozlabs.org; Mon, 24 May 2021 06:46:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48394) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ll85Q-0004y5-7t for qemu-devel@nongnu.org; Mon, 24 May 2021 06:45:28 -0400 Received: from foss.arm.com ([217.140.110.172]:33400) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ll85N-0005A2-1c for qemu-devel@nongnu.org; Mon, 24 May 2021 06:45:27 -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 6F16031B; Mon, 24 May 2021 03:45:22 -0700 (PDT) Received: from e112269-lin.arm.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9C4403F719; Mon, 24 May 2021 03:45:19 -0700 (PDT) From: Steven Price To: Catalin Marinas , Marc Zyngier , Will Deacon Subject: [PATCH v13 0/8] MTE support for KVM guest Date: Mon, 24 May 2021 11:45:05 +0100 Message-Id: <20210524104513.13258-1-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This series adds support for using the Arm Memory Tagging Extensions (MTE) in a KVM guest. Changes since v12[1]: * Use DEFINE_SPINLOCK() to define tag_sync_lock. * Refactor mte_sync_tags() to take the old PTE value rather than a pointer to the PTE. The checks in set_pte_at() are also strengthed to avoid the function call when possible. * Fix prefix on a couple of patches ("arm64: kvm" -> "KVM: arm64"). * Reorder arguments to sanitise_mte_tags() ("size, pfn" -> "pfn, size"). * Add/improve comments in several places. * Report the host's sanitised version of ID_AA64PFR1_EL1:MTE rather than making up one for the guest. * Insert ISB at the end of mte_switch_to_hyp macro. * Drop the definition of CPU_TFSRE0_EL1 in asm-offsets.c as it isn't used anymore. * Prevent creation of 32 bit vCPUs when MTE is enabled for the guest (and document it). * Move kvm_vm_ioctl_mte_copy_tags() to guest.c. * Reject ZONE_DEVICE memory in kvm_vm_ioctl_mte_copy_tags() and correctly handle pages where PG_mte_tagged hasn't been set yet. * Define MTE_GRANULES_PER_PAGE rather than open coding the divison PAGE_SIZE / MTE_GRANULE_SIZE. * Correct the definition of struct kvm_arm_copy_mte_tags in the docs. Also avoid mentioning MTE_GRANULE_SIZE as it isn't exported to userspace. [1] https://lore.kernel.org/r/20210517123239.8025-1-steven.price@arm.com/ Catalin Marinas (1): arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage() Steven Price (7): arm64: mte: Handle race when synchronising tags arm64: mte: Sync tags for pages where PTE is untagged KVM: arm64: Introduce MTE VM feature KVM: arm64: Save/restore MTE registers KVM: arm64: Expose KVM_ARM_CAP_MTE KVM: arm64: ioctl to fetch/store tags in a guest KVM: arm64: Document MTE capability and ioctl Documentation/virt/kvm/api.rst | 52 ++++++++++++++ arch/arm64/include/asm/kvm_emulate.h | 3 + arch/arm64/include/asm/kvm_host.h | 12 ++++ arch/arm64/include/asm/kvm_mte.h | 68 +++++++++++++++++++ arch/arm64/include/asm/mte-def.h | 1 + arch/arm64/include/asm/mte.h | 4 +- arch/arm64/include/asm/page.h | 6 +- arch/arm64/include/asm/pgtable.h | 22 +++++- arch/arm64/include/asm/sysreg.h | 3 +- arch/arm64/include/uapi/asm/kvm.h | 11 +++ arch/arm64/kernel/asm-offsets.c | 2 + arch/arm64/kernel/mte.c | 37 ++++++++-- arch/arm64/kvm/arm.c | 16 +++++ arch/arm64/kvm/guest.c | 79 ++++++++++++++++++++++ arch/arm64/kvm/hyp/entry.S | 7 ++ arch/arm64/kvm/hyp/exception.c | 3 +- arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 21 ++++++ arch/arm64/kvm/mmu.c | 48 ++++++++++++- arch/arm64/kvm/reset.c | 3 +- arch/arm64/kvm/sys_regs.c | 32 +++++++-- arch/arm64/mm/fault.c | 21 ++++++ include/uapi/linux/kvm.h | 2 + 22 files changed, 431 insertions(+), 22 deletions(-) create mode 100644 arch/arm64/include/asm/kvm_mte.h