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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 7C76BC12002 for ; Mon, 19 Jul 2021 10:48:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 668A361026 for ; Mon, 19 Jul 2021 10:48:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236754AbhGSKHy (ORCPT ); Mon, 19 Jul 2021 06:07:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54586 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236768AbhGSKHZ (ORCPT ); Mon, 19 Jul 2021 06:07:25 -0400 Received: from mail-wr1-x449.google.com (mail-wr1-x449.google.com [IPv6:2a00:1450:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A69D4C061767 for ; Mon, 19 Jul 2021 02:56:01 -0700 (PDT) Received: by mail-wr1-x449.google.com with SMTP id a4-20020a0560001884b02901401e436a18so8632111wri.21 for ; Mon, 19 Jul 2021 03:48:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=CdbaQ8ErF1YpwqlK/5v4bHdri/rt0mg1VAsqwWTr/Tw=; b=aS8jkLkK2wa4INhA28hZzPjEUZaTZKmwenqCsFfJQTdAz0UFabdJsQo6ri3VfTWEFw RGYXatDhYnjA27xu0fDx7wkypb2FYIlxvf85tFl8oYsJq2rHaR4IgkQpa+q4+FwBsWna y/5f6F8ckCQplGSacvD6+H8TPidKSuTLdk1aFl3aPp9BvtHNW1S7YV6XGANf94XI+K92 wG0tzBduwioFtmG8ODCJFZhpzoP2jF27+9hOe1r+E4fg0ujsayMVKVG7rMKfXMgeAsAF CGBfReNZE1y1Up6lw+wxGzVUgnz28Z7y6A7GjkAKvbDoo8/B1qcvnhtx5JDqVDbCH60+ RlAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=CdbaQ8ErF1YpwqlK/5v4bHdri/rt0mg1VAsqwWTr/Tw=; b=WOQdBwsictlEV7i4zdO6Hydb0mQbo5rYMTouk4UYm2Dvg5QTy5jroUbugA8f06QM8F xF7aSmQN+kTkbxNyJk1Pd/em9tOhK5PyMMKgthNgZcf1OOXKRWXlI/zGm7g568fEAXdG /M/RZxDEjLafzQhYbJ6ElsA8gZU9F1iDw4y13whMV18jCbcecK+egMjs72Pg0stGT/KH P7L1mBvu9jv+EWBdkrHh2PVoXmr9Mrf0ZPyEhv9qP+wDa2ekLO2ZqFBlNvDgRqSHnyMu ZSklVeolphKMLmV6qQDYxaMQNPl0BJ4gKfIqtR6H+DdYTT9E+3gD5JRf2KuubErUzx6e 8R1A== X-Gm-Message-State: AOAM531XCCncAWnnXzELrYF1S5/X9ljDevI85uVlOOD+2kIWa+jTldem LmjMoliHZvrRFM+ja+aV5hxfgmrvSIR2 X-Google-Smtp-Source: ABdhPJznScsyUNWBAsIAI2Jzd/ytZ2sHt95anHYybQcNiWFSnjuNiVNyg44CFTl1PSMEfVjtqavG8Cwof0vY X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:1a96:a43f:6c2e:bb5a]) (user=qperret job=sendgmr) by 2002:a7b:ca50:: with SMTP id m16mr31242327wml.140.1626691683897; Mon, 19 Jul 2021 03:48:03 -0700 (PDT) Date: Mon, 19 Jul 2021 11:47:31 +0100 In-Reply-To: <20210719104735.3681732-1-qperret@google.com> Message-Id: <20210719104735.3681732-11-qperret@google.com> Mime-Version: 1.0 References: <20210719104735.3681732-1-qperret@google.com> X-Mailer: git-send-email 2.32.0.402.g57bb445576-goog Subject: [PATCH 10/14] KVM: arm64: Enable retrieving protections attributes of PTEs 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 Introduce helper functions in the KVM stage-2 and stage-1 page-table manipulation library allowing to retrieve the enum kvm_pgtable_prot of a PTE. This will be useful to implement custom walkers outside of pgtable.c. Signed-off-by: Quentin Perret --- arch/arm64/include/asm/kvm_pgtable.h | 20 ++++++++++++ arch/arm64/kvm/hyp/pgtable.c | 49 ++++++++++++++++++++++++++++ 2 files changed, 69 insertions(+) diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index f6d3d5c8910d..1aa49d6aabb7 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -467,4 +467,24 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, */ int kvm_pgtable_stage2_find_range(struct kvm_pgtable *pgt, u64 addr, int owner, struct kvm_mem_range *range); + +/** + * kvm_pgtable_stage2_pte_prot() - Retrieve the protection attributes of a + * stage-2 Page-Table Entry. + * @pte: Page-table entry + * + * Return: protection attributes of the page-table entry in the enum + * kvm_pgtable_prot format. + */ +enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte); + +/** + * kvm_pgtable_hyp_pte_prot() - Retrieve the protection attributes of a stage-1 + * Page-Table Entry. + * @pte: Page-table entry + * + * Return: protection attributes of the page-table entry in the enum + * kvm_pgtable_prot format. + */ +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte); #endif /* __ARM64_KVM_PGTABLE_H__ */ diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index 51598b79dafc..c7120797404a 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -234,6 +234,20 @@ static kvm_pte_t pte_ignored_bit_prot(enum kvm_pgtable_prot prot) return FIELD_PREP(KVM_PTE_LEAF_ATTR_IGNORED, ignored_bits); } +static enum kvm_pgtable_prot pte_read_ignored_bits_prot(kvm_pte_t pte) +{ + enum kvm_pgtable_prot prot = 0; + kvm_pte_t ignored_bits = 0; + + ignored_bits = FIELD_GET(KVM_PTE_LEAF_ATTR_IGNORED, pte); + if (ignored_bits & BIT(1)) + prot |= KVM_PGTABLE_STATE_BORROWED | KVM_PGTABLE_STATE_SHARED; + if (ignored_bits & BIT(0)) + prot |= KVM_PGTABLE_STATE_SHARED; + + return prot; +} + static int kvm_pgtable_visitor_cb(struct kvm_pgtable_walk_data *data, u64 addr, u32 level, kvm_pte_t *ptep, enum kvm_pgtable_walk_flags flag) @@ -386,6 +400,25 @@ static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep) return 0; } +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte) +{ + enum kvm_pgtable_prot prot = 0; + u32 ap; + + if (!(pte & KVM_PTE_LEAF_ATTR_HI_S1_XN)) + prot |= KVM_PGTABLE_PROT_X; + + ap = FIELD_GET(KVM_PTE_LEAF_ATTR_LO_S1_AP, pte); + if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RO) + prot |= KVM_PGTABLE_PROT_R; + else if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RW) + prot |= KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W; + + prot |= pte_read_ignored_bits_prot(pte); + + return prot; +} + static bool hyp_pte_needs_update(kvm_pte_t old, kvm_pte_t new) { if (old == new) @@ -588,6 +621,22 @@ static int stage2_set_prot_attr(struct kvm_pgtable *pgt, enum kvm_pgtable_prot p return 0; } +enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte) +{ + enum kvm_pgtable_prot prot = 0; + + if (pte & KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R) + prot |= KVM_PGTABLE_PROT_R; + if (pte & KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W) + prot |= KVM_PGTABLE_PROT_W; + if (!(pte & KVM_PTE_LEAF_ATTR_HI_S2_XN)) + prot |= KVM_PGTABLE_PROT_X; + + prot |= pte_read_ignored_bits_prot(pte); + + return prot; +} + static bool stage2_pte_needs_update(kvm_pte_t old, kvm_pte_t new) { if (!kvm_pte_valid(old) || !kvm_pte_valid(new)) -- 2.32.0.402.g57bb445576-goog