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=-17.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 B2F76C4338F for ; Mon, 9 Aug 2021 15:32:13 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 73F886101D for ; Mon, 9 Aug 2021 15:32:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 73F886101D Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:References: Mime-Version:Message-Id:In-Reply-To:Date:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=7Ql0WwXDfF/vKAdkJCUhqeWqxxkDF0koFWHQVT4cfSg=; b=jdMKrIohSJak4q+VVS9AImhXgl RX/sd9Bj0YTuoqDufoA10/12siALz02tECz39zEKq4SpuoAW7EbEbcpokdc0OhJFtuKD1uXKk04d+ Me+rXjr/p+N03frVdlenfVfhXUYHoSe6uiHUdCN2vArE8p5O5OK7ZFstuwCxtBaTXZjaGfIAIPW7T 2zZrXoPme9WSuHEF9e7DfJzSkzsFtDVHy7KjOukIzzNf+gnybMopKIbZ+FHRKuvGzDAbjWD9z4dD3 CN1K6xkIZ7sCScaNQicfyEFdxOtZWiyb2MSEi2FDcqUbhOiq9tsBiqHooVLx+o4ONsGE0hBaC7KQk K4eNgaXA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mD7E2-001ACV-St; Mon, 09 Aug 2021 15:30:03 +0000 Received: from mail-qv1-xf4a.google.com ([2607:f8b0:4864:20::f4a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mD79R-0017wT-7V for linux-arm-kernel@lists.infradead.org; Mon, 09 Aug 2021 15:25:18 +0000 Received: by mail-qv1-xf4a.google.com with SMTP id b8-20020a0562141148b02902f1474ce8b7so12548428qvt.20 for ; Mon, 09 Aug 2021 08:25:16 -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=4CFmU9uB5cuxc2lPCoWChXDNr9f3K+SqIKdnjLv1P4s=; b=rZmm2VKnjSmuiIf5p19o76FrNYszuOISRqkab3N4YFD95ogVFJvhagSQdpHXMeyhyj c3A82CuZtPTSFGFh2BXtGtUxrxi+jv2tB4LAp9D4hIFry+Hza8zHQht3NLujuVS1Ibus 92eAwBDgemHLSymFMTKMs6lCfK4aAEP3jvkHWkXoLKMUSzIQUgc1+A9Ex2PaRj+rpOb9 rxDag7IKYRu/MIgk/849635PQ18cH9sGG+H1T5zF/KKhXHTs5KpPyb2wXNjdavHHI1KM y/oFj0sH5zDEHl5qt/kGTjIthWR1z2MGqphl5V8yT7U28ZnIoRYxuG0VWw9zZDJSn9wM UdoA== 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=4CFmU9uB5cuxc2lPCoWChXDNr9f3K+SqIKdnjLv1P4s=; b=ZT9shPgvesQMTQjjmJBeJLEpOiWCNQ1RPsiGRQvkNe7tqRCYT7jzKWzdHERNuvgmwy B/p8X6a1jL3WbkCIu5UbPUQFixQzCbNFKZG00fatEKRXqe0/J/sl6yNYokSEF6zRq4DK 3adiRA8kvb8D+mOoSRlw5zpoo9XP/VDrg45b1ELHMxEyPlYltOnbxdg3tM5pG04jigP9 2rCB9doIytQ4ASSvqqJXoP0YqI0FBF6KlhS0F5nTu7xaqhcTDKYRRdTYqzN9Fn0JPuWk Ar1HjfO86MBAvz6QhKVF7ohGSvocv45PgKg+Xs/xbU42Zvr7xHjAg5/dg2U1eWTg562G kPUQ== X-Gm-Message-State: AOAM531dX6uqf19dJOXn4g/uAW0Yb1ien+tBt4874DFyUcbjk6h543nc kw3gUDV0EsDja24S6G6TQ9DbtkDuMTIX X-Google-Smtp-Source: ABdhPJxlnJqrt/Vc6kgjycoOm+7KHQ8sxsdJFc8/TA+ubWDblTmiAVGwH3I7qjBHoAKuZruQygdEooL2YeNk X-Received: from luke.lon.corp.google.com ([2a00:79e0:d:210:b0e8:d460:758b:a0ae]) (user=qperret job=sendgmr) by 2002:a05:6214:10c8:: with SMTP id r8mr24109684qvs.28.1628522715621; Mon, 09 Aug 2021 08:25:15 -0700 (PDT) Date: Mon, 9 Aug 2021 16:24:38 +0100 In-Reply-To: <20210809152448.1810400-1-qperret@google.com> Message-Id: <20210809152448.1810400-12-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 11/21] KVM: arm64: Allow populating software 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210809_082517_314525_B137A962 X-CRM114-Status: GOOD ( 16.51 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Introduce infrastructure allowing to manipulate software bits in stage-1 and stage-2 page-tables using additional entries in the kvm_pgtable_prot enum. This is heavily inspired by Marc's implementation of a similar feature in the NV patch series, but adapted to allow stage-1 changes as well: https://lore.kernel.org/kvmarm/20210510165920.1913477-56-maz@kernel.org/ Suggested-by: Marc Zyngier Signed-off-by: Quentin Perret --- arch/arm64/include/asm/kvm_pgtable.h | 12 +++++++++++- arch/arm64/kvm/hyp/pgtable.c | 5 +++++ 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index 2c090b0eee77..ff9d52f8073a 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -121,6 +121,10 @@ enum kvm_pgtable_stage2_flags { * @KVM_PGTABLE_PROT_W: Write permission. * @KVM_PGTABLE_PROT_R: Read permission. * @KVM_PGTABLE_PROT_DEVICE: Device attributes. + * @KVM_PGTABLE_PROT_SW0: Software bit 0. + * @KVM_PGTABLE_PROT_SW1: Software bit 1. + * @KVM_PGTABLE_PROT_SW2: Software bit 2. + * @KVM_PGTABLE_PROT_SW3: Software bit 3. */ enum kvm_pgtable_prot { KVM_PGTABLE_PROT_X = BIT(0), @@ -128,6 +132,11 @@ enum kvm_pgtable_prot { KVM_PGTABLE_PROT_R = BIT(2), KVM_PGTABLE_PROT_DEVICE = BIT(3), + + KVM_PGTABLE_PROT_SW0 = BIT(55), + KVM_PGTABLE_PROT_SW1 = BIT(56), + KVM_PGTABLE_PROT_SW2 = BIT(57), + KVM_PGTABLE_PROT_SW3 = BIT(58), }; #define KVM_PGTABLE_PROT_RW (KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W) @@ -420,7 +429,8 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr); * If there is a valid, leaf page-table entry used to translate @addr, then * relax the permissions in that entry according to the read, write and * execute permissions specified by @prot. No permissions are removed, and - * TLB invalidation is performed after updating the entry. + * TLB invalidation is performed after updating the entry. Software bits cannot + * be set or cleared using kvm_pgtable_stage2_relax_perms(). * * Return: 0 on success, negative error code on failure. */ diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index e25d829587b9..cff744136044 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -357,6 +357,7 @@ static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep) attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_AP, ap); attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S1_SH, sh); attr |= KVM_PTE_LEAF_ATTR_LO_S1_AF; + attr |= prot & KVM_PTE_LEAF_ATTR_HI_SW; *ptep = attr; return 0; @@ -558,6 +559,7 @@ static int stage2_set_prot_attr(struct kvm_pgtable *pgt, enum kvm_pgtable_prot p attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S2_SH, sh); attr |= KVM_PTE_LEAF_ATTR_LO_S2_AF; + attr |= prot & KVM_PTE_LEAF_ATTR_HI_SW; *ptep = attr; return 0; @@ -1025,6 +1027,9 @@ int kvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr, u32 level; kvm_pte_t set = 0, clr = 0; + if (prot & KVM_PTE_LEAF_ATTR_HI_SW) + return -EINVAL; + if (prot & KVM_PGTABLE_PROT_R) set |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R; -- 2.32.0.605.g8dce9f2422-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel