From patchwork Thu Dec 8 19:38:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Matlack X-Patchwork-Id: 13068729 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 7654BC25B04 for ; Thu, 8 Dec 2022 19:40:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229804AbiLHTka (ORCPT ); Thu, 8 Dec 2022 14:40:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229845AbiLHTkK (ORCPT ); Thu, 8 Dec 2022 14:40:10 -0500 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0BB99389F8 for ; Thu, 8 Dec 2022 11:39:55 -0800 (PST) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-3b48b605351so24972577b3.22 for ; Thu, 08 Dec 2022 11:39:54 -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=4kZ8qvn0xSGEDmN1BULNYrOl9BfWlHWgwc5Hcokigkg=; b=EZdYCeKRzwTZI0V7uIlvSkGrs4qHYIezoRhReYtQLA0czf3gVL/1TNq7yKqDrl8GTn oQz0Z7XBBQH/yEQMO1SGLwncbAgZKGbmAOjFD34HdUxLfAxVVglbdugT3hkL39u2KBaC zXXOHY89LcKvSnZnJXUb8dDzrzFe4X7e3xR+WnsmfduMxTHD82PxDk3bNR9/eVBZSZCJ 9KSr/LExzaCvHBnmGNmO5FnVmhBkHRZqq/6nuGCySvf95RTgk84Zq8NxZx5p92YocoN3 edBU29eHd/xnGcG9xhXPifzW3E7yu6pOK5Yi9gnxeJFRaCY91DpX/jIM8sH3OWbKiQbv X7yQ== 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=4kZ8qvn0xSGEDmN1BULNYrOl9BfWlHWgwc5Hcokigkg=; b=J5mMjtw7CtVx/u6cQFEt/4J/B/WRliA6zNACT5rsLXdLmalkiB7HZx+w+udfb3+RRy lyqN+US2feRbAY492oA74IN4DnBStuXcVBDQ4SCO+6X0zBtx0Lx+c2/TPBQky8GgS7fH RE+VmdojDQS/9+an9I6cvHgKEgLTxMa0v+uBuU7eJC1N0/wMlbWGPOhWXznxjZ6/mBSf FJ8k/rXj/nKkWahHlF0raPiuMRl/mtWoD7UM/PLBoPHexihMHwH2o6m5UeY2gr6YfuC3 fYp9Dj3NeJGdgmHJgX3Ve8kufxpE9Wt1jwrNnVzgg4WiqhoyL/ic9O2i89LZ3m/S1zf7 gg1g== X-Gm-Message-State: ANoB5pnDYkmafDub4mVJJ8YwNTEFxHktNx05A23tSAU92ee9rhhP0PzT xZWwVigXskrkliEkqCSu4Wgiv53vFxKhMQ== X-Google-Smtp-Source: AA0mqf7VJDwYeOhSUwL8eiN/HYDWJI0TjJovtybda2o797oyUV7aBV39Tw6SLnFjKIqdIxSPeuhwuLTwG1fExA== X-Received: from dmatlack-n2d-128.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:1309]) (user=dmatlack job=sendgmr) by 2002:a25:dfc3:0:b0:6f3:2748:7469 with SMTP id w186-20020a25dfc3000000b006f327487469mr53271438ybg.564.1670528390734; Thu, 08 Dec 2022 11:39:50 -0800 (PST) Date: Thu, 8 Dec 2022 11:38:46 -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: <20221208193857.4090582-27-dmatlack@google.com> Subject: [RFC PATCH 26/37] KVM: Move page table cache to struct kvm_vcpu 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: linux-mips@vger.kernel.org Add a kvm_mmu_memory_cache to struct kvm_vcpu for allocating pages for page tables, replacing existing architecture-specific page table caches. Purposely do not make management of this cache architecture-neutral though to reduce churn and since not all architectures configure it the same way (MIPS does not set __GFP_ZERO.) This eliminates a dependency of the TDP MMU on an architecture-specific field, which will be used in a future commit to move the TDP MMU to common code. Signed-off-by: David Matlack --- arch/arm64/include/asm/kvm_host.h | 3 --- arch/arm64/kvm/arm.c | 4 ++-- arch/arm64/kvm/mmu.c | 2 +- arch/mips/include/asm/kvm_host.h | 3 --- arch/mips/kvm/mmu.c | 4 ++-- arch/riscv/include/asm/kvm_host.h | 3 --- arch/riscv/kvm/mmu.c | 2 +- arch/riscv/kvm/vcpu.c | 4 ++-- arch/x86/include/asm/kvm_host.h | 1 - arch/x86/kvm/mmu/mmu.c | 8 ++++---- arch/x86/kvm/mmu/tdp_mmu.c | 2 +- include/linux/kvm_host.h | 5 +++++ 12 files changed, 18 insertions(+), 23 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 001c8abe87fc..da519d6c09a5 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -473,9 +473,6 @@ struct kvm_vcpu_arch { /* vcpu power state */ struct kvm_mp_state mp_state; - /* Cache some mmu pages needed inside spinlock regions */ - struct kvm_mmu_memory_cache mmu_page_cache; - /* Target CPU and feature flags */ int target; DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 9c5573bc4614..0e0d4c4f79a2 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -340,7 +340,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) vcpu->arch.target = -1; bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); - vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO; + vcpu->mmu_page_table_cache.gfp_zero = __GFP_ZERO; /* * Default value for the FP state, will be overloaded at load @@ -375,7 +375,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) if (vcpu_has_run_once(vcpu) && unlikely(!irqchip_in_kernel(vcpu->kvm))) static_branch_dec(&userspace_irqchip_in_use); - kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); + kvm_mmu_free_memory_cache(&vcpu->mmu_page_table_cache); kvm_timer_vcpu_terminate(vcpu); kvm_pmu_vcpu_destroy(vcpu); diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 31d7fa4c7c14..d431c5cdb26a 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1196,7 +1196,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, bool device = false; unsigned long mmu_seq; struct kvm *kvm = vcpu->kvm; - struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; + struct kvm_mmu_memory_cache *memcache = &vcpu->mmu_page_table_cache; struct vm_area_struct *vma; short vma_shift; gfn_t gfn; diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 5cedb28e8a40..b7f276331583 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -344,9 +344,6 @@ struct kvm_vcpu_arch { /* Bitmask of pending exceptions to be cleared */ unsigned long pending_exceptions_clr; - /* Cache some mmu pages needed inside spinlock regions */ - struct kvm_mmu_memory_cache mmu_page_cache; - /* vcpu's vzguestid is different on each host cpu in an smp system */ u32 vzguestid[NR_CPUS]; diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c index 74cd64a24d05..638f728d0bbe 100644 --- a/arch/mips/kvm/mmu.c +++ b/arch/mips/kvm/mmu.c @@ -27,7 +27,7 @@ void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu) { - kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); + kvm_mmu_free_memory_cache(&vcpu->mmu_page_table_cache); } /** @@ -589,7 +589,7 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, pte_t *out_entry, pte_t *out_buddy) { struct kvm *kvm = vcpu->kvm; - struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; + struct kvm_mmu_memory_cache *memcache = &vcpu->mmu_page_table_cache; gfn_t gfn = gpa >> PAGE_SHIFT; int srcu_idx, err; kvm_pfn_t pfn; diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index dbbf43d52623..82e5d80347cc 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -219,9 +219,6 @@ struct kvm_vcpu_arch { /* SBI context */ struct kvm_sbi_context sbi_context; - /* Cache pages needed to program page tables with spinlock held */ - struct kvm_mmu_memory_cache mmu_page_cache; - /* VCPU power-off state */ bool power_off; diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c index 3620ecac2fa1..a8281a65cb3d 100644 --- a/arch/riscv/kvm/mmu.c +++ b/arch/riscv/kvm/mmu.c @@ -625,7 +625,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu, gfn_t gfn = gpa >> PAGE_SHIFT; struct vm_area_struct *vma; struct kvm *kvm = vcpu->kvm; - struct kvm_mmu_memory_cache *pcache = &vcpu->arch.mmu_page_cache; + struct kvm_mmu_memory_cache *pcache = &vcpu->mmu_page_table_cache; bool logging = (memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY)) ? true : false; unsigned long vma_pagesize, mmu_seq; diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c index 71ebbc4821f0..9a1001ada936 100644 --- a/arch/riscv/kvm/vcpu.c +++ b/arch/riscv/kvm/vcpu.c @@ -160,7 +160,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) /* Mark this VCPU never ran */ vcpu->arch.ran_atleast_once = false; - vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO; + vcpu->mmu_page_table_cache.gfp_zero = __GFP_ZERO; bitmap_zero(vcpu->arch.isa, RISCV_ISA_EXT_MAX); /* Setup ISA features available to VCPU */ @@ -211,7 +211,7 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) kvm_riscv_vcpu_timer_deinit(vcpu); /* Free unused pages pre-allocated for G-stage page table mappings */ - kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); + kvm_mmu_free_memory_cache(&vcpu->mmu_page_table_cache); } int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 95c731028452..8cac8ec29324 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -714,7 +714,6 @@ struct kvm_vcpu_arch { struct kvm_mmu *walk_mmu; struct kvm_mmu_memory_cache mmu_pte_list_desc_cache; - struct kvm_mmu_memory_cache mmu_shadow_page_cache; struct kvm_mmu_memory_cache mmu_shadowed_info_cache; struct kvm_mmu_memory_cache mmu_page_header_cache; diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index aea7df3c2dcb..a845e9141ad4 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -664,7 +664,7 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu, bool maybe_indirect) 1 + PT64_ROOT_MAX_LEVEL + PTE_PREFETCH_NUM); if (r) return r; - r = kvm_mmu_topup_memory_cache(&vcpu->arch.mmu_shadow_page_cache, + r = kvm_mmu_topup_memory_cache(&vcpu->mmu_page_table_cache, PT64_ROOT_MAX_LEVEL); if (r) return r; @@ -681,7 +681,7 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu, bool maybe_indirect) static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) { kvm_mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache); - kvm_mmu_free_memory_cache(&vcpu->arch.mmu_shadow_page_cache); + kvm_mmu_free_memory_cache(&vcpu->mmu_page_table_cache); kvm_mmu_free_memory_cache(&vcpu->arch.mmu_shadowed_info_cache); kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache); } @@ -2218,7 +2218,7 @@ static struct kvm_mmu_page *kvm_mmu_get_shadow_page(struct kvm_vcpu *vcpu, { struct shadow_page_caches caches = { .page_header_cache = &vcpu->arch.mmu_page_header_cache, - .shadow_page_cache = &vcpu->arch.mmu_shadow_page_cache, + .shadow_page_cache = &vcpu->mmu_page_table_cache, .shadowed_info_cache = &vcpu->arch.mmu_shadowed_info_cache, }; @@ -5920,7 +5920,7 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu) vcpu->arch.mmu_page_header_cache.kmem_cache = mmu_page_header_cache; vcpu->arch.mmu_page_header_cache.gfp_zero = __GFP_ZERO; - vcpu->arch.mmu_shadow_page_cache.gfp_zero = __GFP_ZERO; + vcpu->mmu_page_table_cache.gfp_zero = __GFP_ZERO; vcpu->arch.mmu = &vcpu->arch.root_mmu; vcpu->arch.walk_mmu = &vcpu->arch.root_mmu; diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index c5d1c9010d21..922815407b7e 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -264,7 +264,7 @@ static struct kvm_mmu_page *tdp_mmu_alloc_sp(struct kvm_vcpu *vcpu) struct kvm_mmu_page *sp; sp = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache); - sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache); + sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->mmu_page_table_cache); return sp; } diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 242eaed55320..0a9baa493760 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -387,6 +387,11 @@ struct kvm_vcpu { */ struct kvm_memory_slot *last_used_slot; u64 last_used_slot_gen; + +#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE + /* Cache used to allocate pages for use as page tables. */ + struct kvm_mmu_memory_cache mmu_page_table_cache; +#endif }; /*