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 52607C432BE for ; Thu, 29 Jul 2021 13:28:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 35DFE60F46 for ; Thu, 29 Jul 2021 13:28:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237610AbhG2N2o (ORCPT ); Thu, 29 Jul 2021 09:28:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46184 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237639AbhG2N2g (ORCPT ); Thu, 29 Jul 2021 09:28:36 -0400 Received: from mail-wm1-x349.google.com (mail-wm1-x349.google.com [IPv6:2a00:1450:4864:20::349]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 484B0C0613C1 for ; Thu, 29 Jul 2021 06:28:33 -0700 (PDT) Received: by mail-wm1-x349.google.com with SMTP id j204-20020a1c23d50000b029024e75a15714so2024788wmj.0 for ; Thu, 29 Jul 2021 06:28:33 -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=Gjf1jLwbr60oU/lDUo56+HNoAVcvWGbxZryQe2MxgVI=; b=liAJ/B9k752zaUtEr2dNmyI6PNIq95D2uxyTofIPP2Y9x50NOXw4/JT8oVxsLvIkmc P7ulUWGLvyLx+t+fWD8rdAsH4RvIVZHUhm9AOhec5RvozMBkX+zZj7nLaIAXqPqIyTGm qMSgBtOd1z4GkgAg8Aq2iTh9+h3RRsOREBBjibJ8VnR4P30ZOtFv7y65TudPffgn0bRg RznpmwquKro9JhqASPV8OQxONr9moaG80DsU8VJsjXcHn5Yyqn3qHvtX9DT4MJ6bUy36 iuW7lgbeDizByaPiTm3DcjyGsmrR4gr7L+ezKHNRzsImGGj1FE1SjSaaY2EcjvFz2eYA lr2g== 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=Gjf1jLwbr60oU/lDUo56+HNoAVcvWGbxZryQe2MxgVI=; b=ntGQsegZTHsWXxx5nvlsQ+vWyNJ4EQpvN75+j5lanXWn6XsfKtFtKNtIAJhjU/l7dr iQhmhxz4UiPIF/LBWw2LJanR4N5IZbk1MXvzIl8qqF5iwUVbq3W9UpYpQG5UywspkqQ6 SpYX8r4jvgmqITzyQPzGJ58ftsHhs/W2qM/es8Sdq5SyYC/lKTz7Ksy0FSX1Xu2CVGYw PLawXKe3Z8Nxs1oiP3t2hxp96x9ll2HGwlJ92R8VW1iaWefCoC//rVTPVTXvCHkQU3wH XpiNo86sPvUDM2cSE/7t40sBHdYbV9/9bGUpKKav3j6EUP+Ab8bOAm+db1Yx5ktushyG XvkA== X-Gm-Message-State: AOAM531yNDyZ/Ejr0HCa/aVLFSEmq3jrINB38uE23J6H9RubxE4F4Eea Bod4zsInwUr0WwIsDK+zWFucVf6NLt4m X-Google-Smtp-Source: ABdhPJyC7oJeo9hm9rZKLPbAlJuErb6lfSMGOtMtJPYFP3+ud7lcAhFVhw7sxxXnSC8c2pWtkaZZ9KzshhQh X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:293a:bc89:7514:5218]) (user=qperret job=sendgmr) by 2002:a7b:c147:: with SMTP id z7mr4842725wmi.10.1627565311894; Thu, 29 Jul 2021 06:28:31 -0700 (PDT) Date: Thu, 29 Jul 2021 14:28:01 +0100 In-Reply-To: <20210729132818.4091769-1-qperret@google.com> Message-Id: <20210729132818.4091769-5-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 04/21] KVM: arm64: Introduce helper to retrieve a PTE and its level 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 From: Marc Zyngier It is becoming a common need to fetch the PTE for a given address together with its level. Add such a helper. Signed-off-by: Marc Zyngier Signed-off-by: Quentin Perret --- arch/arm64/include/asm/kvm_pgtable.h | 19 ++++++++++++++ arch/arm64/kvm/hyp/pgtable.c | 39 ++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index f004c0115d89..082b9d65f40b 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -432,6 +432,25 @@ int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size); int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, struct kvm_pgtable_walker *walker); +/** + * kvm_pgtable_get_leaf() - Walk a page-table and retrieve the leaf entry + * with its level. + * @pgt: Page-table structure initialised by kvm_pgtable_*_init(). + * @addr: Input address for the start of the walk. + * @ptep: Pointer to storage for the retrieved PTE. + * @level: Pointer to storage for the level of the retrieved PTE. + * + * The offset of @addr within a page is ignored. + * + * The walker will walk the page-table entries corresponding to the input + * address specified, retrieving the leaf corresponding to this address. + * Invalid entries are treated as leaf entries. + * + * Return: 0 on success, negative error code on failure. + */ +int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr, + kvm_pte_t *ptep, u32 *level); + /** * kvm_pgtable_stage2_find_range() - Find a range of Intermediate Physical * Addresses with compatible permission diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index 05321f4165e3..78f36bd5df6c 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -326,6 +326,45 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size, return _kvm_pgtable_walk(&walk_data); } +struct leaf_walk_data { + kvm_pte_t pte; + u32 level; +}; + +static int leaf_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep, + enum kvm_pgtable_walk_flags flag, void * const arg) +{ + struct leaf_walk_data *data = arg; + + data->pte = *ptep; + data->level = level; + + return 0; +} + +int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr, + kvm_pte_t *ptep, u32 *level) +{ + struct leaf_walk_data data; + struct kvm_pgtable_walker walker = { + .cb = leaf_walker, + .flags = KVM_PGTABLE_WALK_LEAF, + .arg = &data, + }; + int ret; + + ret = kvm_pgtable_walk(pgt, ALIGN_DOWN(addr, PAGE_SIZE), + PAGE_SIZE, &walker); + if (!ret) { + if (ptep) + *ptep = data.pte; + if (level) + *level = data.level; + } + + return ret; +} + struct hyp_map_data { u64 phys; kvm_pte_t attr; -- 2.32.0.432.gabb21c7263-goog