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Thu, 08 Dec 2022 11:39:52 -0800 (PST) Date: Thu, 8 Dec 2022 11:38:47 -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: <20221208193857.4090582-28-dmatlack@google.com> Subject: [RFC PATCH 27/37] KVM: MMU: Move mmu_page_header_cache to common code 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221208_193953_323804_8E4BDCF9 X-CRM114-Status: GOOD ( 17.60 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Move vcpu->arch.mmu_page_header_cache and its backing kmem_cache to common code in preparation for moving the TDP MMU to common code in a future commit. The kmem_cache is still only initialized and used on x86 for the time being to avoid affecting other architectures. A future commit can move the code to manage this cache to common code. No functional change intended. Signed-off-by: David Matlack --- arch/x86/kvm/mmu/mmu.c | 11 +++++------ arch/x86/kvm/mmu/mmu_internal.h | 2 -- arch/x86/kvm/mmu/tdp_mmu.c | 2 +- include/kvm/mmu.h | 2 ++ include/linux/kvm_host.h | 3 +++ virt/kvm/kvm_main.c | 1 + 6 files changed, 12 insertions(+), 9 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index a845e9141ad4..f01ee01f3509 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -163,7 +163,6 @@ struct kvm_shadow_walk_iterator { __shadow_walk_next(&(_walker), spte)) static struct kmem_cache *pte_list_desc_cache; -struct kmem_cache *mmu_page_header_cache; static struct percpu_counter kvm_total_used_mmu_pages; static void mmu_spte_set(u64 *sptep, u64 spte); @@ -674,7 +673,7 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu, bool maybe_indirect) if (r) return r; } - return kvm_mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, + return kvm_mmu_topup_memory_cache(&vcpu->mmu_page_header_cache, PT64_ROOT_MAX_LEVEL); } @@ -683,7 +682,7 @@ 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->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); + kvm_mmu_free_memory_cache(&vcpu->mmu_page_header_cache); } static void mmu_free_pte_list_desc(struct pte_list_desc *pte_list_desc) @@ -2217,7 +2216,7 @@ static struct kvm_mmu_page *kvm_mmu_get_shadow_page(struct kvm_vcpu *vcpu, union kvm_mmu_page_role role) { struct shadow_page_caches caches = { - .page_header_cache = &vcpu->arch.mmu_page_header_cache, + .page_header_cache = &vcpu->mmu_page_header_cache, .shadow_page_cache = &vcpu->mmu_page_table_cache, .shadowed_info_cache = &vcpu->arch.mmu_shadowed_info_cache, }; @@ -5917,8 +5916,8 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu) vcpu->arch.mmu_pte_list_desc_cache.kmem_cache = pte_list_desc_cache; vcpu->arch.mmu_pte_list_desc_cache.gfp_zero = __GFP_ZERO; - vcpu->arch.mmu_page_header_cache.kmem_cache = mmu_page_header_cache; - vcpu->arch.mmu_page_header_cache.gfp_zero = __GFP_ZERO; + vcpu->mmu_page_header_cache.kmem_cache = mmu_page_header_cache; + vcpu->mmu_page_header_cache.gfp_zero = __GFP_ZERO; vcpu->mmu_page_table_cache.gfp_zero = __GFP_ZERO; diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index d3c1d08002af..4aa60d5d87b0 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -44,8 +44,6 @@ extern bool dbg; #define INVALID_PAE_ROOT 0 #define IS_VALID_PAE_ROOT(x) (!!(x)) -extern struct kmem_cache *mmu_page_header_cache; - static inline bool kvm_mmu_page_ad_need_write_protect(struct kvm_mmu_page *sp) { /* diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 922815407b7e..891877a6fb78 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -263,7 +263,7 @@ 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 = kvm_mmu_memory_cache_alloc(&vcpu->mmu_page_header_cache); sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->mmu_page_table_cache); return sp; diff --git a/include/kvm/mmu.h b/include/kvm/mmu.h index 425db8e4f8e9..f1416828f8fe 100644 --- a/include/kvm/mmu.h +++ b/include/kvm/mmu.h @@ -4,6 +4,8 @@ #include +extern struct kmem_cache *mmu_page_header_cache; + static inline struct kvm_mmu_page *to_shadow_page(hpa_t shadow_page) { struct page *page = pfn_to_page((shadow_page) >> PAGE_SHIFT); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 0a9baa493760..ec3a6de6d54e 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -391,6 +391,9 @@ struct kvm_vcpu { #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; + + /* Cache used to allocate kvm_mmu_page structs. */ + struct kvm_mmu_memory_cache mmu_page_header_cache; #endif }; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 954ab969f55e..0f1d48ed7d57 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -108,6 +108,7 @@ static int kvm_usage_count; static atomic_t hardware_enable_failed; static struct kmem_cache *kvm_vcpu_cache; +struct kmem_cache *mmu_page_header_cache; static __read_mostly struct preempt_ops kvm_preempt_ops; static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_running_vcpu);