From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3AA7C04FF3 for ; Mon, 24 May 2021 10:45:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFD73610C8 for ; Mon, 24 May 2021 10:45:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232713AbhEXKqv (ORCPT ); Mon, 24 May 2021 06:46:51 -0400 Received: from foss.arm.com ([217.140.110.172]:40742 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232397AbhEXKqu (ORCPT ); Mon, 24 May 2021 06:46:50 -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 Cc: Steven Price , James Morse , Julien Thierry , Suzuki K Poulose , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Dave Martin , Mark Rutland , Thomas Gleixner , qemu-devel@nongnu.org, Juan Quintela , "Dr. David Alan Gilbert" , Richard Henderson , Peter Maydell , Haibo Xu , Andrew Jones 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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 -- 2.20.1