From patchwork Thu Dec 8 19:38:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Matlack X-Patchwork-Id: 13068760 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6B798C4167B for ; Thu, 8 Dec 2022 19:40:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229824AbiLHTkF (ORCPT ); Thu, 8 Dec 2022 14:40:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229819AbiLHTjs (ORCPT ); Thu, 8 Dec 2022 14:39:48 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 426311AA26 for ; Thu, 8 Dec 2022 11:39:34 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id j6-20020a05690212c600b006fc7f6e6955so2549884ybu.12 for ; Thu, 08 Dec 2022 11:39:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=Pg1Nq3rulqWxdtA2fJcZW38Nt6WCEHzRUfCCpYS2KV0=; b=aDqf6pXxZybLQuV+ns7MyujXZ7TaXxPsXCkY1cBCTnm7Z1Pk34Q2WxafDnw6pX7BHN lhEXYUvCnQrmxi67UqIabYRYVsFr1VmRYMnDgU/nCVe0vfpF9o0e/pk5kPNnjxwaoCkb 6UzjVRaqPFUO0UrFxoxAA1OT7EuOIecZ2ihew0iHfezGa4aHmagqVFYtCzqCsOXcoWMG 1BSI0f3h3n0sV4Xz4NHwLOJuYaVAHIAoL3P08pyo0Lb7cFRQm3wK50yoCvEQji2rKMPw TJvkYFZnHosx8g6qnVV89WiLKgj9ZlDUDj9dOxU8qckP9jmYepoaBePV4tvKaqieAvx3 Iqsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Pg1Nq3rulqWxdtA2fJcZW38Nt6WCEHzRUfCCpYS2KV0=; b=2Imknw8usMIgMt5IZNhVHjXKeSppfM6mum8M8P94p96oVYMgyfSJmxSQXXCigQQQwI nndOCjVOYM4vHdL36WJ2jkmWZMYClE/vXvtWFUhnbnqy8AOrxwkXLfKcZq4C/SxQeUVy 2+eDju1QBSN/ejmrXF+by3oKmvTFJRqn824qEGtPzakk1xNy+23bfHHJ7aJXWgp2eS7A uUyKpzbgcP+nsj2r9vXhonAYD9r8W+YD/0cGUGg5w+0OEvkrEjQNaLpVralngIe6xING V7AdfoGKOvAh+nlL5q8A/mprGMrARM6uTixn1gVcUxOpVp/FD1kfmsL2m5avOynNU34M CbBw== X-Gm-Message-State: ANoB5pl5a7oikPyFbczZEdc0aQHyqpiWAI3wTESPozfJYyyfSPLbaYle T2mzYOdV8BH9nRE/1z9k4pxEJNjdVnfNMQ== X-Google-Smtp-Source: AA0mqf7iyktvhKElr4AnSOjLzx6ehM+nhpfhEwE2rLq/JpjuQYZLUjwLo76vc17Zh1ckOWCNKP3vo6QzYulWTQ== X-Received: from dmatlack-n2d-128.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:1309]) (user=dmatlack job=sendgmr) by 2002:a25:25cf:0:b0:704:9d40:ecce with SMTP id l198-20020a2525cf000000b007049d40eccemr9539756ybl.316.1670528373481; Thu, 08 Dec 2022 11:39:33 -0800 (PST) Date: Thu, 8 Dec 2022 11:38:36 -0800 In-Reply-To: <20221208193857.4090582-1-dmatlack@google.com> Mime-Version: 1.0 References: <20221208193857.4090582-1-dmatlack@google.com> X-Mailer: git-send-email 2.39.0.rc1.256.g54fd8350bd-goog Message-ID: <20221208193857.4090582-17-dmatlack@google.com> Subject: [RFC PATCH 16/37] KVM: x86/mmu: Abstract away TDP MMU root lookup From: David Matlack To: Paolo Bonzini Cc: Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Huacai Chen , Aleksandar Markovic , Anup Patel , Atish Patra , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , Andrew Morton , David Matlack , Anshuman Khandual , Nadav Amit , "Matthew Wilcox (Oracle)" , Vlastimil Babka , "Liam R. Howlett" , Suren Baghdasaryan , Peter Xu , xu xin , Arnd Bergmann , Yu Zhao , Colin Cross , Hugh Dickins , Ben Gardon , Mingwei Zhang , Krish Sadhukhan , Ricardo Koller , Jing Zhang , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Abstract the code that looks up the TDP MMU root from vcpu->arch.mmu behind a function, tdp_mmu_root(). This will be used in a future commit to allow the TDP MMU to be moved to common code, where vcpu->arch.mmu cannot be accessed directly. Signed-off-by: David Matlack --- arch/x86/include/asm/kvm/tdp_pgtable.h | 2 ++ arch/x86/kvm/mmu/tdp_mmu.c | 17 +++++++---------- arch/x86/kvm/mmu/tdp_pgtable.c | 5 +++++ 3 files changed, 14 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/kvm/tdp_pgtable.h b/arch/x86/include/asm/kvm/tdp_pgtable.h index cebc4bc44b49..c5c4e4cab24a 100644 --- a/arch/x86/include/asm/kvm/tdp_pgtable.h +++ b/arch/x86/include/asm/kvm/tdp_pgtable.h @@ -5,6 +5,8 @@ #include #include +struct kvm_mmu_page *tdp_mmu_root(struct kvm_vcpu *vcpu); + /* * Use a semi-arbitrary value that doesn't set RWX bits, i.e. is not-present on * both AMD and Intel CPUs, and doesn't set PFN bits, i.e. doesn't create a L1TF diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index fea42bbac984..8155a9e79203 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -788,9 +788,6 @@ static inline void tdp_mmu_set_spte_no_dirty_log(struct kvm *kvm, continue; \ else -#define tdp_mmu_for_each_pte(_iter, _mmu, _start, _end) \ - for_each_tdp_pte(_iter, to_shadow_page(_mmu->root.hpa), _start, _end) - /* * Yield if the MMU lock is contended or this thread needs to return control * to the scheduler. @@ -1145,7 +1142,7 @@ static int tdp_mmu_split_huge_page(struct kvm *kvm, struct tdp_iter *iter, */ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) { - struct kvm_mmu *mmu = vcpu->arch.mmu; + struct kvm_mmu_page *root = tdp_mmu_root(vcpu); struct kvm *kvm = vcpu->kvm; struct tdp_iter iter; struct kvm_mmu_page *sp; @@ -1157,7 +1154,7 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) rcu_read_lock(); - tdp_mmu_for_each_pte(iter, mmu, fault->gfn, fault->gfn + 1) { + for_each_tdp_pte(iter, root, fault->gfn, fault->gfn + 1) { int r; if (fault->arch.nx_huge_page_workaround_enabled) @@ -1826,14 +1823,14 @@ bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm, int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes, int *root_level) { + struct kvm_mmu_page *root = tdp_mmu_root(vcpu); struct tdp_iter iter; - struct kvm_mmu *mmu = vcpu->arch.mmu; gfn_t gfn = addr >> PAGE_SHIFT; int leaf = -1; - *root_level = vcpu->arch.mmu->root_role.level; + *root_level = root->role.level; - tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) { + for_each_tdp_pte(iter, root, gfn, gfn + 1) { leaf = iter.level; sptes[leaf] = iter.old_spte; } @@ -1855,12 +1852,12 @@ int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes, u64 *kvm_tdp_mmu_fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, u64 addr, u64 *spte) { + struct kvm_mmu_page *root = tdp_mmu_root(vcpu); struct tdp_iter iter; - struct kvm_mmu *mmu = vcpu->arch.mmu; gfn_t gfn = addr >> PAGE_SHIFT; tdp_ptep_t sptep = NULL; - tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) { + for_each_tdp_pte(iter, root, gfn, gfn + 1) { *spte = iter.old_spte; sptep = iter.sptep; } diff --git a/arch/x86/kvm/mmu/tdp_pgtable.c b/arch/x86/kvm/mmu/tdp_pgtable.c index cf3b692d8e21..97cc900e8818 100644 --- a/arch/x86/kvm/mmu/tdp_pgtable.c +++ b/arch/x86/kvm/mmu/tdp_pgtable.c @@ -13,6 +13,11 @@ static_assert(TDP_PTE_WRITABLE_MASK == PT_WRITABLE_MASK); static_assert(TDP_PTE_HUGE_PAGE_MASK == PT_PAGE_SIZE_MASK); static_assert(TDP_PTE_PRESENT_MASK == SPTE_MMU_PRESENT_MASK); +struct kvm_mmu_page *tdp_mmu_root(struct kvm_vcpu *vcpu) +{ + return to_shadow_page(vcpu->arch.mmu->root.hpa); +} + bool tdp_pte_is_accessed(u64 pte) { return is_accessed_spte(pte);