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 4CADDC4338F for ; Thu, 29 Jul 2021 13:29:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 317B860EBC for ; Thu, 29 Jul 2021 13:29:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237868AbhG2N3o (ORCPT ); Thu, 29 Jul 2021 09:29:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237779AbhG2N3E (ORCPT ); Thu, 29 Jul 2021 09:29:04 -0400 Received: from mail-ed1-x549.google.com (mail-ed1-x549.google.com [IPv6:2a00:1450:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 085E9C0613C1 for ; Thu, 29 Jul 2021 06:29:01 -0700 (PDT) Received: by mail-ed1-x549.google.com with SMTP id d12-20020a50fe8c0000b02903a4b519b413so2944186edt.9 for ; Thu, 29 Jul 2021 06:29:00 -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=NSGLd5rP0jEwEBedGkOnIxS9bTOxpLrW9yksOtiI2rw=; b=V/JC2o+aGhrHJS4UXvEuNCHDiEoLg0Y9XUZ8DbpCYMVAaV4Qp4pzYEUbN0+dCmIvz7 ug5TgqNXz91s47rFXRUdqwwXHw4JQuDC4YIRvTaES4qlC6IViW7MlohARYj5vvT0HcXy /5bS8SkpCABb135E8AaU/tE8brFIIdv5fpfYyBW71CPKxptU9BgZs+MYtCqgHg+dBstw duJUKwMMAPYhVeA9CtbAiKMEryWEmXgjNczXNbmQgmcV5olnAQbG+pcpqX2jyZgCv6/G 2PpFBHLl2j4lLRIWTBQgzXUfNbOCBlsqYaTYIFoxKrvw8JAyP3M415pQ3MBK0SqcQDRG qZow== 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=NSGLd5rP0jEwEBedGkOnIxS9bTOxpLrW9yksOtiI2rw=; b=MAzHbhmR2UxJHrWr1W/CjhWgRzEruPKHGMiHj7/1+PCqqroIGIgyfX8A+q3SLJmyMZ KEQA+Cg1lOriGKfXBR1Q3nktVDOQxHN6MBgcLZ9NsoYl1f552KQY+JEO/KT7PY9HNBeH KSeBp/ZROCHrPLtFl7oJviQP4yGVtdYyFwzNJeXZB+doyC3MVvw71rhR22qxUKEIEAIe iW41Ad7nGdc8MwwICkkWcm3opEo1i/9R+UIoEsjiUbPej73127FMO2HQI9HuXj3Yml8k 97Z/jnL9TxhHTfHR2W5tLyDKIhUA2u70TMdTlfo2M18M7hzQBaYBXNozrYOrMSIQZoVT VQgA== X-Gm-Message-State: AOAM530b0QwB55ZVSAAD52CfwYb706oK4hBBO+ueSU3SZLtYxV29Yq1h 7buRuBly1EKa5RII+wXmYKoISGaA1btU X-Google-Smtp-Source: ABdhPJzB+o9pIY4nGwgIcOv53lmv+Ol4R2FzrR+UHxpEjNw7CJIBQCY1IdszSXZqu7HKk8gJv4G9waEPi+1Y X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:293a:bc89:7514:5218]) (user=qperret job=sendgmr) by 2002:a17:906:1701:: with SMTP id c1mr4576882eje.425.1627565339524; Thu, 29 Jul 2021 06:28:59 -0700 (PDT) Date: Thu, 29 Jul 2021 14:28:13 +0100 In-Reply-To: <20210729132818.4091769-1-qperret@google.com> Message-Id: <20210729132818.4091769-17-qperret@google.com> Mime-Version: 1.0 References: <20210729132818.4091769-1-qperret@google.com> X-Mailer: git-send-email 2.32.0.432.gabb21c7263-goog Subject: [PATCH v3 16/21] 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 | 37 ++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index d5ca9b6ce241..7ff9f52239ba 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -505,4 +505,24 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, */ int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr, kvm_pte_t *ptep, u32 *level); + +/** + * 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 1915489bb127..a6eda8f23cb6 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -363,6 +363,26 @@ 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 = pte & KVM_PTE_LEAF_ATTR_HI_SW; + u32 ap; + + if (!kvm_pte_valid(pte)) + return prot; + + 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; + + return prot; +} + static bool hyp_pte_needs_update(kvm_pte_t old, kvm_pte_t new) { /* @@ -565,6 +585,23 @@ 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 = pte & KVM_PTE_LEAF_ATTR_HI_SW; + + if (!kvm_pte_valid(pte)) + return prot; + + 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; + + 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)) -- 2.32.0.432.gabb21c7263-goog