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=-21.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL 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 D8600C4338F for ; Thu, 29 Jul 2021 13:28:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B330B60184 for ; Thu, 29 Jul 2021 13:28:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237528AbhG2N22 (ORCPT ); Thu, 29 Jul 2021 09:28:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237420AbhG2N21 (ORCPT ); Thu, 29 Jul 2021 09:28:27 -0400 Received: from mail-qv1-xf49.google.com (mail-qv1-xf49.google.com [IPv6:2607:f8b0:4864:20::f49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31D8BC0613C1 for ; Thu, 29 Jul 2021 06:28:23 -0700 (PDT) Received: by mail-qv1-xf49.google.com with SMTP id r14-20020a0c8d0e0000b02902e82df307f0so3932708qvb.4 for ; Thu, 29 Jul 2021 06:28:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=uCsDvrfcUF+1HjCy/5u0lXgukkeSpeNSQPNFAPtE5Og=; b=TwUGuSD9qt0RaCZOS9MqYshAwbluPWeQnV47t4m6fl1LT4Bu8aMFJPgR4wel2mQ/0d VMq3hAK+GBdhK0pDqqszgH6EjWtt0g+gsttm5me4V/4bLlmdJtY8xDdSkXQhD2+kh7En APBRNllYpK/w+G4htTFazfyOkcJT2CNzdRflI8pGflgUvStmidwaEZJ1ISLDNIz8XHkE I8TAGDAGu8wQRDYBI3LsbMZm8DvGc5Yhi05TnDxDgHirqn7QwkGG9pUJKe1iAk3KJ5ST nrE4ll47uKL1HWghtXbFmGP9rQo/7u9BGNvZD5e4hpV4BN1enHUmTMlPD1rE19y/oH2I Rzug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=uCsDvrfcUF+1HjCy/5u0lXgukkeSpeNSQPNFAPtE5Og=; b=SxpD7hxGtpT2VQgV9LrsTJVL4aBD6nTLQ7lUW6BU2dKxgCRNwMm16/0VgtuXqoL9A7 zyci1iuZainzsTxSNSAbuYytd/bAv8172yr/6rZ50njiFqFPJfy4Hvf8xVuzUo/NfeZp RHE6atRQ4+nYxwHyI3kzgZ9nZuqe9VZqeAXcJyaRzPv5oT6vKNKgrS4BNnojmNcwSRjq X0b/SugOy5QXEsIuLDVNKc/c3FfwtbcToFctDYdvgAOS6fRtxE/Ux8yN1DhV8cj5wAhV MkvmWNh8FumyLgrjowCszLG+pXJd1NQX0niS49Z3XqDLiChAjwWvg4z8sEf/CRSSa2Qx /Ggw== X-Gm-Message-State: AOAM531B9AQuPvglgor0BQPmv6LmfyI/2SmwrOouikL0C6eyZBSfbADx BPmDtO+BhFU0C+7N6Meg22SxLIXNWiKV X-Google-Smtp-Source: ABdhPJwFLu6UzIEWRzj8e8yAxcsgzIxAgdeYD1x+wnn2xqD3UBVZS+HjIyhzCZDdD20gs2aUkHHEOqy6y/hY X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:293a:bc89:7514:5218]) (user=qperret job=sendgmr) by 2002:a05:6214:27e7:: with SMTP id jt7mr5278007qvb.28.1627565302295; Thu, 29 Jul 2021 06:28:22 -0700 (PDT) Date: Thu, 29 Jul 2021 14:27:57 +0100 Message-Id: <20210729132818.4091769-1-qperret@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.32.0.432.gabb21c7263-goog Subject: [PATCH v3 00/21] Track shared pages at EL2 in protected mode From: Quentin Perret To: maz@kernel.org, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, ardb@kernel.org, qwandor@google.com, tabba@google.com, dbrazdil@google.com, kernel-team@android.com, Quentin Perret Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, This is v3 of the patch series previously posted here: https://lore.kernel.org/kvmarm/20210726092905.2198501-1-qperret@google.com/ This series aims to improve how the nVHE hypervisor tracks ownership of memory pages when running in protected mode ("kvm-arm.mode=protected" on the kernel command line). The main issue with the existing ownership tracking code is that it is completely binary: a page is either owned by an entity (e.g. the host) or not. However, we'll need something smarter to track shared pages, as is needed for virtio, or even just host/hypervisor communications. This series introduces a few changes to the kvm page-table library to allow annotating shared pages in ignored bits (a.k.a. software bits) of leaf entries, and makes use of that infrastructure to track all pages that are shared between the host and the hypervisor. We will obviously want to apply the same treatment to guest stage-2 page-tables, but that is not really possible to do until EL2 manages them directly, so I'll keep that for another series. The series is based on the kvmarm/fixes branch, and has been tested on AML-S905X-CC (Le Potato) and using various Qemu configurations. Changes since v2: - Renamed and refactored the find_range() path for host memory aborts; - Added hyp_assert_lock_held() using Will's hyp_spin_is_locked() helper, and sprinkled a few of them throughout the series; - Changed how host stage-2 mappings are adjusted after __pkvm_init() by walking the hyp stage-1 instead of relying on the host calling __pkvm_mark_hyp. Changes since v1: - Changed the 'share' hypercall to accept a single page at a time; - Dropped the patch allowing to continue stage-2 map when hitting the EAGAIN case; - Dropped some of the custom pgtable walkers and used Marc's get_leaf() patch instead; - Changed pgtable API to manipulate SW bits directly rather than specifying shared pages; - Added comments and documentations all over; - Cleanups and small refactoring. Thanks, Quentin Marc Zyngier (1): KVM: arm64: Introduce helper to retrieve a PTE and its level Quentin Perret (19): KVM: arm64: Introduce hyp_assert_lock_held() KVM: arm64: Provide the host_stage2_try() helper macro KVM: arm64: Expose page-table helpers KVM: arm64: Optimize host memory aborts KVM: arm64: Rename KVM_PTE_LEAF_ATTR_S2_IGNORED KVM: arm64: Don't overwrite software bits with owner id KVM: arm64: Tolerate re-creating hyp mappings to set software bits KVM: arm64: Enable forcing page-level stage-2 mappings KVM: arm64: Allow populating software bits KVM: arm64: Add helpers to tag shared pages in SW bits KVM: arm64: Expose host stage-2 manipulation helpers KVM: arm64: Expose pkvm_hyp_id KVM: arm64: Introduce addr_is_memory() KVM: arm64: Enable retrieving protections attributes of PTEs KVM: arm64: Mark host bss and rodata section as shared KVM: arm64: Remove __pkvm_mark_hyp KVM: arm64: Refactor protected nVHE stage-1 locking KVM: arm64: Restrict EL2 stage-1 changes in protected mode KVM: arm64: Make __pkvm_create_mappings static Will Deacon (1): KVM: arm64: Add hyp_spin_is_locked() for basic locking assertions at EL2 arch/arm64/include/asm/kvm_asm.h | 5 +- arch/arm64/include/asm/kvm_pgtable.h | 166 ++++++++---- arch/arm64/kvm/Kconfig | 9 + arch/arm64/kvm/arm.c | 46 ---- arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 33 ++- arch/arm64/kvm/hyp/include/nvhe/mm.h | 3 +- arch/arm64/kvm/hyp/include/nvhe/spinlock.h | 25 ++ arch/arm64/kvm/hyp/nvhe/hyp-main.c | 20 +- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 221 ++++++++++++++-- arch/arm64/kvm/hyp/nvhe/mm.c | 22 +- arch/arm64/kvm/hyp/nvhe/setup.c | 82 +++++- arch/arm64/kvm/hyp/pgtable.c | 247 +++++++++--------- arch/arm64/kvm/mmu.c | 28 +- 13 files changed, 625 insertions(+), 282 deletions(-) -- 2.32.0.432.gabb21c7263-goog