From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com ([134.134.136.24]:3196 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726343AbgGCCgO (ORCPT ); Thu, 2 Jul 2020 22:36:14 -0400 From: Sean Christopherson Subject: [PATCH v3 15/21] KVM: Move x86's MMU memory cache helpers to common KVM code Date: Thu, 2 Jul 2020 19:35:39 -0700 Message-ID: <20200703023545.8771-16-sean.j.christopherson@intel.com> In-Reply-To: <20200703023545.8771-1-sean.j.christopherson@intel.com> References: <20200703023545.8771-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-arch-owner@vger.kernel.org List-ID: To: Marc Zyngier , Paolo Bonzini , Arnd Bergmann Cc: James Morse , Julien Thierry , Suzuki K Poulose , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Ben Gardon , Peter Feiner , Peter Shier , Junaid Shahid , Christoffer Dall Message-ID: <20200703023539.6PJLKDs2qyBhidbRjEE485syjfRzsx05KWNWi2gv-CM@z> Move x86's memory cache helpers to common KVM code so that they can be reused by arm64 and MIPS in future patches. Suggested-by: Christoffer Dall Reviewed-by: Ben Gardon Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 53 -------------------------------------- include/linux/kvm_host.h | 7 +++++ virt/kvm/kvm_main.c | 55 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 62 insertions(+), 53 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index f4c8dae476bb..5b7782d92faf 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1060,47 +1060,6 @@ static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu) local_irq_enable(); } -static inline void *mmu_memory_cache_alloc_obj(struct kvm_mmu_memory_cache *mc, - gfp_t gfp_flags) -{ - gfp_flags |= mc->gfp_zero; - - if (mc->kmem_cache) - return kmem_cache_alloc(mc->kmem_cache, gfp_flags); - else - return (void *)__get_free_page(gfp_flags); -} - -static int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min) -{ - void *obj; - - if (mc->nobjs >= min) - return 0; - while (mc->nobjs < ARRAY_SIZE(mc->objects)) { - obj = mmu_memory_cache_alloc_obj(mc, GFP_KERNEL_ACCOUNT); - if (!obj) - return mc->nobjs >= min ? 0 : -ENOMEM; - mc->objects[mc->nobjs++] = obj; - } - return 0; -} - -static int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc) -{ - return mc->nobjs; -} - -static void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) -{ - while (mc->nobjs) { - if (mc->kmem_cache) - kmem_cache_free(mc->kmem_cache, mc->objects[--mc->nobjs]); - else - free_page((unsigned long)mc->objects[--mc->nobjs]); - } -} - static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu, bool maybe_indirect) { int r; @@ -1132,18 +1091,6 @@ static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache); } -static void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) -{ - void *p; - - if (WARN_ON(!mc->nobjs)) - p = mmu_memory_cache_alloc_obj(mc, GFP_ATOMIC | __GFP_ACCOUNT); - else - p = mc->objects[--mc->nobjs]; - BUG_ON(!p); - return p; -} - static struct pte_list_desc *mmu_alloc_pte_list_desc(struct kvm_vcpu *vcpu) { return kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache); diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 9edc6fc71a89..283df0fed4a8 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -816,6 +816,13 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool usermode_vcpu_not_eligible); void kvm_flush_remote_tlbs(struct kvm *kvm); void kvm_reload_remote_mmus(struct kvm *kvm); +#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE +int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min); +int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc); +void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc); +void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc); +#endif + bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, struct kvm_vcpu *except, unsigned long *vcpu_bitmap, cpumask_var_t tmp); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a852af5c3214..e70d75de185d 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -340,6 +340,61 @@ void kvm_reload_remote_mmus(struct kvm *kvm) kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); } +#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE +static inline void *mmu_memory_cache_alloc_obj(struct kvm_mmu_memory_cache *mc, + gfp_t gfp_flags) +{ + gfp_flags |= mc->gfp_zero; + + if (mc->kmem_cache) + return kmem_cache_alloc(mc->kmem_cache, gfp_flags); + else + return (void *)__get_free_page(gfp_flags); +} + +int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min) +{ + void *obj; + + if (mc->nobjs >= min) + return 0; + while (mc->nobjs < ARRAY_SIZE(mc->objects)) { + obj = mmu_memory_cache_alloc_obj(mc, GFP_KERNEL_ACCOUNT); + if (!obj) + return mc->nobjs >= min ? 0 : -ENOMEM; + mc->objects[mc->nobjs++] = obj; + } + return 0; +} + +int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc) +{ + return mc->nobjs; +} + +void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) +{ + while (mc->nobjs) { + if (mc->kmem_cache) + kmem_cache_free(mc->kmem_cache, mc->objects[--mc->nobjs]); + else + free_page((unsigned long)mc->objects[--mc->nobjs]); + } +} + +void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) +{ + void *p; + + if (WARN_ON(!mc->nobjs)) + p = mmu_memory_cache_alloc_obj(mc, GFP_ATOMIC | __GFP_ACCOUNT); + else + p = mc->objects[--mc->nobjs]; + BUG_ON(!p); + return p; +} +#endif + static void kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) { mutex_init(&vcpu->mutex); -- 2.26.0