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=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 19D31C4338F for ; Mon, 9 Aug 2021 15:25:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF2D061052 for ; Mon, 9 Aug 2021 15:25:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235653AbhHIPZy (ORCPT ); Mon, 9 Aug 2021 11:25:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235651AbhHIPZl (ORCPT ); Mon, 9 Aug 2021 11:25:41 -0400 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88CB5C06179F for ; Mon, 9 Aug 2021 08:25:18 -0700 (PDT) Received: by mail-qv1-xf4a.google.com with SMTP id bo13-20020a05621414adb029035561c68664so980010qvb.1 for ; Mon, 09 Aug 2021 08:25:18 -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=8jz2lJsOdyZcDtlCHC3Dvx0yZKTs2N3b55wAk/v95ow=; b=BDFa2yN6cmKJG3x9zJSFyiSyGXrWwbQI3EkRXEyAoiDsNiZxnCuM7yr8Oa4sS4dxId 5eKr+FKgGlQq97sho5QfjNNpY4QVEgOwGe4qnto8+PH1sPYKxvsSFFEWd/WmFfbdUvkD c3sroI1akznW1wvpagXKal01dux4IP23CQRoyQzKlB2Hq7vZwlRmeuzMiiGUULtM74EO vqk/PboQA93VAnMy1vjV9PrMoZNR67MMoGR8eoMC8skkuWKBSfLRX65XrYlx1k9PzQEL B4Vu9eiDVi86Co2QUmAnVC43oq9HYU5EMtVUKZQVLmLRE/lJ3PSGixyaFvXfy8rmzq2H k/VQ== 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=8jz2lJsOdyZcDtlCHC3Dvx0yZKTs2N3b55wAk/v95ow=; b=iRf+GwY0x7x3yVKbP9EURw/3Y4qeC0P37rUG31x9lz5sFJLzdRRQyfjguzSs2/OjRU GHKbXg9Sx2d/m8tiHWuckFDu0AQMSfOZCbpJNEcnb4CrEXsWEW7WSKDyg+ZFtqWonngB MJO6fSAShhDtQm+yNWFR2rmG2cyOkii+XY/ef8yNegTf9J345eRJwUeQWCTSgVCT3fNJ u0hhrafzPvHHZT3UFt74qF2XDjexh3ioRps8l+3Zg0XSVrFGJSsqbJHQHWr4s7k4pVDr BrLP4szbc+GaKUbBnWEWpmutZHHycmLFP6tiSXzKWUEINFAQVQH06ARZ/X5fULfrUfZN D5Yw== X-Gm-Message-State: AOAM532oMBY/zJ/ODcNUMgrjN2QcvjkrUu8ob93gdybjZA+ahpQT0Mn5 n1/1iVAZRVB+wXNKrdPIkcBwdKf2E+Db X-Google-Smtp-Source: ABdhPJz2l1NOBwMrE26TsCA7occvb2o9beTqoSppx2h3dHXwe0dIzSOg5MwgreJKvwJvtlmSCeojgXOCjH28 X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:b0e8:d460:758b:a0ae]) (user=qperret job=sendgmr) by 2002:a05:6214:10c4:: with SMTP id r4mr24445444qvs.58.1628522717738; Mon, 09 Aug 2021 08:25:17 -0700 (PDT) Date: Mon, 9 Aug 2021 16:24:39 +0100 In-Reply-To: <20210809152448.1810400-1-qperret@google.com> Message-Id: <20210809152448.1810400-13-qperret@google.com> Mime-Version: 1.0 References: <20210809152448.1810400-1-qperret@google.com> X-Mailer: git-send-email 2.32.0.605.g8dce9f2422-goog Subject: [PATCH v4 12/21] KVM: arm64: Add helpers to tag shared pages in SW bits 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, qperret@google.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We will soon start annotating shared pages in page-tables in nVHE protected mode. Define all the states in which a page can be (owned, shared and owned, shared and borrowed), and provide helpers allowing to convert this into SW bits annotations using the matching prot attributes. Reviewed-by: Fuad Tabba Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h index 9c227d87c36d..87b1690c439f 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -12,6 +12,32 @@ #include #include +/* + * SW bits 0-1 are reserved to track the memory ownership state of each page: + * 00: The page is owned exclusively by the page-table owner. + * 01: The page is owned by the page-table owner, but is shared + * with another entity. + * 10: The page is shared with, but not owned by the page-table owner. + * 11: Reserved for future use (lending). + */ +enum pkvm_page_state { + PKVM_PAGE_OWNED = 0ULL, + PKVM_PAGE_SHARED_OWNED = KVM_PGTABLE_PROT_SW0, + PKVM_PAGE_SHARED_BORROWED = KVM_PGTABLE_PROT_SW1, +}; + +#define PKVM_PAGE_STATE_PROT_MASK (KVM_PGTABLE_PROT_SW0 | KVM_PGTABLE_PROT_SW1) +static inline enum kvm_pgtable_prot pkvm_mkstate(enum kvm_pgtable_prot prot, + enum pkvm_page_state state) +{ + return (prot & ~PKVM_PAGE_STATE_PROT_MASK) | state; +} + +static inline enum pkvm_page_state pkvm_getstate(enum kvm_pgtable_prot prot) +{ + return prot & PKVM_PAGE_STATE_PROT_MASK; +} + struct host_kvm { struct kvm_arch arch; struct kvm_pgtable pgt; -- 2.32.0.605.g8dce9f2422-goog