1fe5db27dSBen Gardon // SPDX-License-Identifier: GPL-2.0 2fe5db27dSBen Gardon 302c00b3aSBen Gardon #include "mmu.h" 402c00b3aSBen Gardon #include "mmu_internal.h" 5bb18842eSBen Gardon #include "mmutrace.h" 62f2fad08SBen Gardon #include "tdp_iter.h" 7fe5db27dSBen Gardon #include "tdp_mmu.h" 802c00b3aSBen Gardon #include "spte.h" 9fe5db27dSBen Gardon 1033dd3574SBen Gardon #include <trace/events/kvm.h> 1133dd3574SBen Gardon 1295fb5b02SBen Gardon #ifdef CONFIG_X86_64 13fe5db27dSBen Gardon static bool __read_mostly tdp_mmu_enabled = false; 1495fb5b02SBen Gardon module_param_named(tdp_mmu, tdp_mmu_enabled, bool, 0644); 1595fb5b02SBen Gardon #endif 16fe5db27dSBen Gardon 17fe5db27dSBen Gardon static bool is_tdp_mmu_enabled(void) 18fe5db27dSBen Gardon { 19fe5db27dSBen Gardon #ifdef CONFIG_X86_64 20fe5db27dSBen Gardon return tdp_enabled && READ_ONCE(tdp_mmu_enabled); 21fe5db27dSBen Gardon #else 22fe5db27dSBen Gardon return false; 23fe5db27dSBen Gardon #endif /* CONFIG_X86_64 */ 24fe5db27dSBen Gardon } 25fe5db27dSBen Gardon 26fe5db27dSBen Gardon /* Initializes the TDP MMU for the VM, if enabled. */ 27fe5db27dSBen Gardon void kvm_mmu_init_tdp_mmu(struct kvm *kvm) 28fe5db27dSBen Gardon { 29fe5db27dSBen Gardon if (!is_tdp_mmu_enabled()) 30fe5db27dSBen Gardon return; 31fe5db27dSBen Gardon 32fe5db27dSBen Gardon /* This should not be changed for the lifetime of the VM. */ 33fe5db27dSBen Gardon kvm->arch.tdp_mmu_enabled = true; 3402c00b3aSBen Gardon 3502c00b3aSBen Gardon INIT_LIST_HEAD(&kvm->arch.tdp_mmu_roots); 3689c0fd49SBen Gardon INIT_LIST_HEAD(&kvm->arch.tdp_mmu_pages); 37fe5db27dSBen Gardon } 38fe5db27dSBen Gardon 39fe5db27dSBen Gardon void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) 40fe5db27dSBen Gardon { 41fe5db27dSBen Gardon if (!kvm->arch.tdp_mmu_enabled) 42fe5db27dSBen Gardon return; 4302c00b3aSBen Gardon 4402c00b3aSBen Gardon WARN_ON(!list_empty(&kvm->arch.tdp_mmu_roots)); 4502c00b3aSBen Gardon } 4602c00b3aSBen Gardon 47a889ea54SBen Gardon static void tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root) 48a889ea54SBen Gardon { 49a889ea54SBen Gardon if (kvm_mmu_put_root(kvm, root)) 50a889ea54SBen Gardon kvm_tdp_mmu_free_root(kvm, root); 51a889ea54SBen Gardon } 52a889ea54SBen Gardon 53a889ea54SBen Gardon static inline bool tdp_mmu_next_root_valid(struct kvm *kvm, 54a889ea54SBen Gardon struct kvm_mmu_page *root) 55a889ea54SBen Gardon { 56a889ea54SBen Gardon lockdep_assert_held(&kvm->mmu_lock); 57a889ea54SBen Gardon 58a889ea54SBen Gardon if (list_entry_is_head(root, &kvm->arch.tdp_mmu_roots, link)) 59a889ea54SBen Gardon return false; 60a889ea54SBen Gardon 61a889ea54SBen Gardon kvm_mmu_get_root(kvm, root); 62a889ea54SBen Gardon return true; 63a889ea54SBen Gardon 64a889ea54SBen Gardon } 65a889ea54SBen Gardon 66a889ea54SBen Gardon static inline struct kvm_mmu_page *tdp_mmu_next_root(struct kvm *kvm, 67a889ea54SBen Gardon struct kvm_mmu_page *root) 68a889ea54SBen Gardon { 69a889ea54SBen Gardon struct kvm_mmu_page *next_root; 70a889ea54SBen Gardon 71a889ea54SBen Gardon next_root = list_next_entry(root, link); 72a889ea54SBen Gardon tdp_mmu_put_root(kvm, root); 73a889ea54SBen Gardon return next_root; 74a889ea54SBen Gardon } 75a889ea54SBen Gardon 76a889ea54SBen Gardon /* 77a889ea54SBen Gardon * Note: this iterator gets and puts references to the roots it iterates over. 78a889ea54SBen Gardon * This makes it safe to release the MMU lock and yield within the loop, but 79a889ea54SBen Gardon * if exiting the loop early, the caller must drop the reference to the most 80a889ea54SBen Gardon * recent root. (Unless keeping a live reference is desirable.) 81a889ea54SBen Gardon */ 82a889ea54SBen Gardon #define for_each_tdp_mmu_root_yield_safe(_kvm, _root) \ 83a889ea54SBen Gardon for (_root = list_first_entry(&_kvm->arch.tdp_mmu_roots, \ 84a889ea54SBen Gardon typeof(*_root), link); \ 85a889ea54SBen Gardon tdp_mmu_next_root_valid(_kvm, _root); \ 86a889ea54SBen Gardon _root = tdp_mmu_next_root(_kvm, _root)) 87a889ea54SBen Gardon 8802c00b3aSBen Gardon #define for_each_tdp_mmu_root(_kvm, _root) \ 8902c00b3aSBen Gardon list_for_each_entry(_root, &_kvm->arch.tdp_mmu_roots, link) 9002c00b3aSBen Gardon 9102c00b3aSBen Gardon bool is_tdp_mmu_root(struct kvm *kvm, hpa_t hpa) 9202c00b3aSBen Gardon { 9302c00b3aSBen Gardon struct kvm_mmu_page *sp; 9402c00b3aSBen Gardon 95c887c9b9SPaolo Bonzini if (!kvm->arch.tdp_mmu_enabled) 96c887c9b9SPaolo Bonzini return false; 97c887c9b9SPaolo Bonzini if (WARN_ON(!VALID_PAGE(hpa))) 98c887c9b9SPaolo Bonzini return false; 99c887c9b9SPaolo Bonzini 10002c00b3aSBen Gardon sp = to_shadow_page(hpa); 101c887c9b9SPaolo Bonzini if (WARN_ON(!sp)) 102c887c9b9SPaolo Bonzini return false; 10302c00b3aSBen Gardon 10402c00b3aSBen Gardon return sp->tdp_mmu_page && sp->root_count; 10502c00b3aSBen Gardon } 10602c00b3aSBen Gardon 107faaf05b0SBen Gardon static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 108063afacdSBen Gardon gfn_t start, gfn_t end, bool can_yield); 109faaf05b0SBen Gardon 11002c00b3aSBen Gardon void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root) 11102c00b3aSBen Gardon { 112339f5a7fSRick Edgecombe gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT); 113faaf05b0SBen Gardon 11402c00b3aSBen Gardon lockdep_assert_held(&kvm->mmu_lock); 11502c00b3aSBen Gardon 11602c00b3aSBen Gardon WARN_ON(root->root_count); 11702c00b3aSBen Gardon WARN_ON(!root->tdp_mmu_page); 11802c00b3aSBen Gardon 11902c00b3aSBen Gardon list_del(&root->link); 12002c00b3aSBen Gardon 121063afacdSBen Gardon zap_gfn_range(kvm, root, 0, max_gfn, false); 122faaf05b0SBen Gardon 12302c00b3aSBen Gardon free_page((unsigned long)root->spt); 12402c00b3aSBen Gardon kmem_cache_free(mmu_page_header_cache, root); 12502c00b3aSBen Gardon } 12602c00b3aSBen Gardon 12702c00b3aSBen Gardon static union kvm_mmu_page_role page_role_for_level(struct kvm_vcpu *vcpu, 12802c00b3aSBen Gardon int level) 12902c00b3aSBen Gardon { 13002c00b3aSBen Gardon union kvm_mmu_page_role role; 13102c00b3aSBen Gardon 13202c00b3aSBen Gardon role = vcpu->arch.mmu->mmu_role.base; 13302c00b3aSBen Gardon role.level = level; 13402c00b3aSBen Gardon role.direct = true; 13502c00b3aSBen Gardon role.gpte_is_8_bytes = true; 13602c00b3aSBen Gardon role.access = ACC_ALL; 13702c00b3aSBen Gardon 13802c00b3aSBen Gardon return role; 13902c00b3aSBen Gardon } 14002c00b3aSBen Gardon 14102c00b3aSBen Gardon static struct kvm_mmu_page *alloc_tdp_mmu_page(struct kvm_vcpu *vcpu, gfn_t gfn, 14202c00b3aSBen Gardon int level) 14302c00b3aSBen Gardon { 14402c00b3aSBen Gardon struct kvm_mmu_page *sp; 14502c00b3aSBen Gardon 14602c00b3aSBen Gardon sp = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache); 14702c00b3aSBen Gardon sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache); 14802c00b3aSBen Gardon set_page_private(virt_to_page(sp->spt), (unsigned long)sp); 14902c00b3aSBen Gardon 15002c00b3aSBen Gardon sp->role.word = page_role_for_level(vcpu, level).word; 15102c00b3aSBen Gardon sp->gfn = gfn; 15202c00b3aSBen Gardon sp->tdp_mmu_page = true; 15302c00b3aSBen Gardon 15433dd3574SBen Gardon trace_kvm_mmu_get_page(sp, true); 15533dd3574SBen Gardon 15602c00b3aSBen Gardon return sp; 15702c00b3aSBen Gardon } 15802c00b3aSBen Gardon 15902c00b3aSBen Gardon static struct kvm_mmu_page *get_tdp_mmu_vcpu_root(struct kvm_vcpu *vcpu) 16002c00b3aSBen Gardon { 16102c00b3aSBen Gardon union kvm_mmu_page_role role; 16202c00b3aSBen Gardon struct kvm *kvm = vcpu->kvm; 16302c00b3aSBen Gardon struct kvm_mmu_page *root; 16402c00b3aSBen Gardon 16502c00b3aSBen Gardon role = page_role_for_level(vcpu, vcpu->arch.mmu->shadow_root_level); 16602c00b3aSBen Gardon 16702c00b3aSBen Gardon spin_lock(&kvm->mmu_lock); 16802c00b3aSBen Gardon 16902c00b3aSBen Gardon /* Check for an existing root before allocating a new one. */ 17002c00b3aSBen Gardon for_each_tdp_mmu_root(kvm, root) { 17102c00b3aSBen Gardon if (root->role.word == role.word) { 17202c00b3aSBen Gardon kvm_mmu_get_root(kvm, root); 17302c00b3aSBen Gardon spin_unlock(&kvm->mmu_lock); 17402c00b3aSBen Gardon return root; 17502c00b3aSBen Gardon } 17602c00b3aSBen Gardon } 17702c00b3aSBen Gardon 17802c00b3aSBen Gardon root = alloc_tdp_mmu_page(vcpu, 0, vcpu->arch.mmu->shadow_root_level); 17902c00b3aSBen Gardon root->root_count = 1; 18002c00b3aSBen Gardon 18102c00b3aSBen Gardon list_add(&root->link, &kvm->arch.tdp_mmu_roots); 18202c00b3aSBen Gardon 18302c00b3aSBen Gardon spin_unlock(&kvm->mmu_lock); 18402c00b3aSBen Gardon 18502c00b3aSBen Gardon return root; 18602c00b3aSBen Gardon } 18702c00b3aSBen Gardon 18802c00b3aSBen Gardon hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu) 18902c00b3aSBen Gardon { 19002c00b3aSBen Gardon struct kvm_mmu_page *root; 19102c00b3aSBen Gardon 19202c00b3aSBen Gardon root = get_tdp_mmu_vcpu_root(vcpu); 19302c00b3aSBen Gardon if (!root) 19402c00b3aSBen Gardon return INVALID_PAGE; 19502c00b3aSBen Gardon 19602c00b3aSBen Gardon return __pa(root->spt); 197fe5db27dSBen Gardon } 1982f2fad08SBen Gardon 1992f2fad08SBen Gardon static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, 2002f2fad08SBen Gardon u64 old_spte, u64 new_spte, int level); 2012f2fad08SBen Gardon 202faaf05b0SBen Gardon static int kvm_mmu_page_as_id(struct kvm_mmu_page *sp) 203faaf05b0SBen Gardon { 204faaf05b0SBen Gardon return sp->role.smm ? 1 : 0; 205faaf05b0SBen Gardon } 206faaf05b0SBen Gardon 207f8e14497SBen Gardon static void handle_changed_spte_acc_track(u64 old_spte, u64 new_spte, int level) 208f8e14497SBen Gardon { 209f8e14497SBen Gardon bool pfn_changed = spte_to_pfn(old_spte) != spte_to_pfn(new_spte); 210f8e14497SBen Gardon 211f8e14497SBen Gardon if (!is_shadow_present_pte(old_spte) || !is_last_spte(old_spte, level)) 212f8e14497SBen Gardon return; 213f8e14497SBen Gardon 214f8e14497SBen Gardon if (is_accessed_spte(old_spte) && 215f8e14497SBen Gardon (!is_accessed_spte(new_spte) || pfn_changed)) 216f8e14497SBen Gardon kvm_set_pfn_accessed(spte_to_pfn(old_spte)); 217f8e14497SBen Gardon } 218f8e14497SBen Gardon 219a6a0b05dSBen Gardon static void handle_changed_spte_dirty_log(struct kvm *kvm, int as_id, gfn_t gfn, 220a6a0b05dSBen Gardon u64 old_spte, u64 new_spte, int level) 221a6a0b05dSBen Gardon { 222a6a0b05dSBen Gardon bool pfn_changed; 223a6a0b05dSBen Gardon struct kvm_memory_slot *slot; 224a6a0b05dSBen Gardon 225a6a0b05dSBen Gardon if (level > PG_LEVEL_4K) 226a6a0b05dSBen Gardon return; 227a6a0b05dSBen Gardon 228a6a0b05dSBen Gardon pfn_changed = spte_to_pfn(old_spte) != spte_to_pfn(new_spte); 229a6a0b05dSBen Gardon 230a6a0b05dSBen Gardon if ((!is_writable_pte(old_spte) || pfn_changed) && 231a6a0b05dSBen Gardon is_writable_pte(new_spte)) { 232a6a0b05dSBen Gardon slot = __gfn_to_memslot(__kvm_memslots(kvm, as_id), gfn); 233fb04a1edSPeter Xu mark_page_dirty_in_slot(kvm, slot, gfn); 234a6a0b05dSBen Gardon } 235a6a0b05dSBen Gardon } 236a6a0b05dSBen Gardon 2372f2fad08SBen Gardon /** 238a066e61fSBen Gardon * handle_removed_tdp_mmu_page - handle a pt removed from the TDP structure 239a066e61fSBen Gardon * 240a066e61fSBen Gardon * @kvm: kvm instance 241a066e61fSBen Gardon * @pt: the page removed from the paging structure 242a066e61fSBen Gardon * 243a066e61fSBen Gardon * Given a page table that has been removed from the TDP paging structure, 244a066e61fSBen Gardon * iterates through the page table to clear SPTEs and free child page tables. 245a066e61fSBen Gardon */ 246a066e61fSBen Gardon static void handle_removed_tdp_mmu_page(struct kvm *kvm, u64 *pt) 247a066e61fSBen Gardon { 248a066e61fSBen Gardon struct kvm_mmu_page *sp = sptep_to_sp(pt); 249a066e61fSBen Gardon int level = sp->role.level; 250a066e61fSBen Gardon gfn_t gfn = sp->gfn; 251a066e61fSBen Gardon u64 old_child_spte; 252a066e61fSBen Gardon int i; 253a066e61fSBen Gardon 254a066e61fSBen Gardon trace_kvm_mmu_prepare_zap_page(sp); 255a066e61fSBen Gardon 256a066e61fSBen Gardon list_del(&sp->link); 257a066e61fSBen Gardon 258a066e61fSBen Gardon if (sp->lpage_disallowed) 259a066e61fSBen Gardon unaccount_huge_nx_page(kvm, sp); 260a066e61fSBen Gardon 261a066e61fSBen Gardon for (i = 0; i < PT64_ENT_PER_PAGE; i++) { 262a066e61fSBen Gardon old_child_spte = READ_ONCE(*(pt + i)); 263a066e61fSBen Gardon WRITE_ONCE(*(pt + i), 0); 264a066e61fSBen Gardon handle_changed_spte(kvm, kvm_mmu_page_as_id(sp), 265a066e61fSBen Gardon gfn + (i * KVM_PAGES_PER_HPAGE(level - 1)), 266a066e61fSBen Gardon old_child_spte, 0, level - 1); 267a066e61fSBen Gardon } 268a066e61fSBen Gardon 269a066e61fSBen Gardon kvm_flush_remote_tlbs_with_address(kvm, gfn, 270a066e61fSBen Gardon KVM_PAGES_PER_HPAGE(level)); 271a066e61fSBen Gardon 272a066e61fSBen Gardon free_page((unsigned long)pt); 273a066e61fSBen Gardon kmem_cache_free(mmu_page_header_cache, sp); 274a066e61fSBen Gardon } 275a066e61fSBen Gardon 276a066e61fSBen Gardon /** 2772f2fad08SBen Gardon * handle_changed_spte - handle bookkeeping associated with an SPTE change 2782f2fad08SBen Gardon * @kvm: kvm instance 2792f2fad08SBen Gardon * @as_id: the address space of the paging structure the SPTE was a part of 2802f2fad08SBen Gardon * @gfn: the base GFN that was mapped by the SPTE 2812f2fad08SBen Gardon * @old_spte: The value of the SPTE before the change 2822f2fad08SBen Gardon * @new_spte: The value of the SPTE after the change 2832f2fad08SBen Gardon * @level: the level of the PT the SPTE is part of in the paging structure 2842f2fad08SBen Gardon * 2852f2fad08SBen Gardon * Handle bookkeeping that might result from the modification of a SPTE. 2862f2fad08SBen Gardon * This function must be called for all TDP SPTE modifications. 2872f2fad08SBen Gardon */ 2882f2fad08SBen Gardon static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, 2892f2fad08SBen Gardon u64 old_spte, u64 new_spte, int level) 2902f2fad08SBen Gardon { 2912f2fad08SBen Gardon bool was_present = is_shadow_present_pte(old_spte); 2922f2fad08SBen Gardon bool is_present = is_shadow_present_pte(new_spte); 2932f2fad08SBen Gardon bool was_leaf = was_present && is_last_spte(old_spte, level); 2942f2fad08SBen Gardon bool is_leaf = is_present && is_last_spte(new_spte, level); 2952f2fad08SBen Gardon bool pfn_changed = spte_to_pfn(old_spte) != spte_to_pfn(new_spte); 2962f2fad08SBen Gardon 2972f2fad08SBen Gardon WARN_ON(level > PT64_ROOT_MAX_LEVEL); 2982f2fad08SBen Gardon WARN_ON(level < PG_LEVEL_4K); 299764388ceSSean Christopherson WARN_ON(gfn & (KVM_PAGES_PER_HPAGE(level) - 1)); 3002f2fad08SBen Gardon 3012f2fad08SBen Gardon /* 3022f2fad08SBen Gardon * If this warning were to trigger it would indicate that there was a 3032f2fad08SBen Gardon * missing MMU notifier or a race with some notifier handler. 3042f2fad08SBen Gardon * A present, leaf SPTE should never be directly replaced with another 3052f2fad08SBen Gardon * present leaf SPTE pointing to a differnt PFN. A notifier handler 3062f2fad08SBen Gardon * should be zapping the SPTE before the main MM's page table is 3072f2fad08SBen Gardon * changed, or the SPTE should be zeroed, and the TLBs flushed by the 3082f2fad08SBen Gardon * thread before replacement. 3092f2fad08SBen Gardon */ 3102f2fad08SBen Gardon if (was_leaf && is_leaf && pfn_changed) { 3112f2fad08SBen Gardon pr_err("Invalid SPTE change: cannot replace a present leaf\n" 3122f2fad08SBen Gardon "SPTE with another present leaf SPTE mapping a\n" 3132f2fad08SBen Gardon "different PFN!\n" 3142f2fad08SBen Gardon "as_id: %d gfn: %llx old_spte: %llx new_spte: %llx level: %d", 3152f2fad08SBen Gardon as_id, gfn, old_spte, new_spte, level); 3162f2fad08SBen Gardon 3172f2fad08SBen Gardon /* 3182f2fad08SBen Gardon * Crash the host to prevent error propagation and guest data 3192f2fad08SBen Gardon * courruption. 3202f2fad08SBen Gardon */ 3212f2fad08SBen Gardon BUG(); 3222f2fad08SBen Gardon } 3232f2fad08SBen Gardon 3242f2fad08SBen Gardon if (old_spte == new_spte) 3252f2fad08SBen Gardon return; 3262f2fad08SBen Gardon 327b9a98c34SBen Gardon trace_kvm_tdp_mmu_spte_changed(as_id, gfn, level, old_spte, new_spte); 328b9a98c34SBen Gardon 3292f2fad08SBen Gardon /* 3302f2fad08SBen Gardon * The only times a SPTE should be changed from a non-present to 3312f2fad08SBen Gardon * non-present state is when an MMIO entry is installed/modified/ 3322f2fad08SBen Gardon * removed. In that case, there is nothing to do here. 3332f2fad08SBen Gardon */ 3342f2fad08SBen Gardon if (!was_present && !is_present) { 3352f2fad08SBen Gardon /* 3362f2fad08SBen Gardon * If this change does not involve a MMIO SPTE, it is 3372f2fad08SBen Gardon * unexpected. Log the change, though it should not impact the 3382f2fad08SBen Gardon * guest since both the former and current SPTEs are nonpresent. 3392f2fad08SBen Gardon */ 3402f2fad08SBen Gardon if (WARN_ON(!is_mmio_spte(old_spte) && !is_mmio_spte(new_spte))) 3412f2fad08SBen Gardon pr_err("Unexpected SPTE change! Nonpresent SPTEs\n" 3422f2fad08SBen Gardon "should not be replaced with another,\n" 3432f2fad08SBen Gardon "different nonpresent SPTE, unless one or both\n" 3442f2fad08SBen Gardon "are MMIO SPTEs.\n" 3452f2fad08SBen Gardon "as_id: %d gfn: %llx old_spte: %llx new_spte: %llx level: %d", 3462f2fad08SBen Gardon as_id, gfn, old_spte, new_spte, level); 3472f2fad08SBen Gardon return; 3482f2fad08SBen Gardon } 3492f2fad08SBen Gardon 3502f2fad08SBen Gardon 3512f2fad08SBen Gardon if (was_leaf && is_dirty_spte(old_spte) && 3522f2fad08SBen Gardon (!is_dirty_spte(new_spte) || pfn_changed)) 3532f2fad08SBen Gardon kvm_set_pfn_dirty(spte_to_pfn(old_spte)); 3542f2fad08SBen Gardon 3552f2fad08SBen Gardon /* 3562f2fad08SBen Gardon * Recursively handle child PTs if the change removed a subtree from 3572f2fad08SBen Gardon * the paging structure. 3582f2fad08SBen Gardon */ 359a066e61fSBen Gardon if (was_present && !was_leaf && (pfn_changed || !is_present)) 360a066e61fSBen Gardon handle_removed_tdp_mmu_page(kvm, 361a066e61fSBen Gardon spte_to_child_pt(old_spte, level)); 3622f2fad08SBen Gardon } 3632f2fad08SBen Gardon 3642f2fad08SBen Gardon static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, 3652f2fad08SBen Gardon u64 old_spte, u64 new_spte, int level) 3662f2fad08SBen Gardon { 3672f2fad08SBen Gardon __handle_changed_spte(kvm, as_id, gfn, old_spte, new_spte, level); 368f8e14497SBen Gardon handle_changed_spte_acc_track(old_spte, new_spte, level); 369a6a0b05dSBen Gardon handle_changed_spte_dirty_log(kvm, as_id, gfn, old_spte, 370a6a0b05dSBen Gardon new_spte, level); 3712f2fad08SBen Gardon } 372faaf05b0SBen Gardon 373fe43fa2fSBen Gardon /* 374fe43fa2fSBen Gardon * __tdp_mmu_set_spte - Set a TDP MMU SPTE and handle the associated bookkeeping 375fe43fa2fSBen Gardon * @kvm: kvm instance 376fe43fa2fSBen Gardon * @iter: a tdp_iter instance currently on the SPTE that should be set 377fe43fa2fSBen Gardon * @new_spte: The value the SPTE should be set to 378fe43fa2fSBen Gardon * @record_acc_track: Notify the MM subsystem of changes to the accessed state 379fe43fa2fSBen Gardon * of the page. Should be set unless handling an MMU 380fe43fa2fSBen Gardon * notifier for access tracking. Leaving record_acc_track 381fe43fa2fSBen Gardon * unset in that case prevents page accesses from being 382fe43fa2fSBen Gardon * double counted. 383fe43fa2fSBen Gardon * @record_dirty_log: Record the page as dirty in the dirty bitmap if 384fe43fa2fSBen Gardon * appropriate for the change being made. Should be set 385fe43fa2fSBen Gardon * unless performing certain dirty logging operations. 386fe43fa2fSBen Gardon * Leaving record_dirty_log unset in that case prevents page 387fe43fa2fSBen Gardon * writes from being double counted. 388fe43fa2fSBen Gardon */ 389f8e14497SBen Gardon static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter, 390a6a0b05dSBen Gardon u64 new_spte, bool record_acc_track, 391a6a0b05dSBen Gardon bool record_dirty_log) 392faaf05b0SBen Gardon { 393faaf05b0SBen Gardon u64 *root_pt = tdp_iter_root_pt(iter); 394faaf05b0SBen Gardon struct kvm_mmu_page *root = sptep_to_sp(root_pt); 395faaf05b0SBen Gardon int as_id = kvm_mmu_page_as_id(root); 396faaf05b0SBen Gardon 3973a9a4aa5SBen Gardon lockdep_assert_held(&kvm->mmu_lock); 3983a9a4aa5SBen Gardon 399f8e14497SBen Gardon WRITE_ONCE(*iter->sptep, new_spte); 400faaf05b0SBen Gardon 401f8e14497SBen Gardon __handle_changed_spte(kvm, as_id, iter->gfn, iter->old_spte, new_spte, 402faaf05b0SBen Gardon iter->level); 403f8e14497SBen Gardon if (record_acc_track) 404f8e14497SBen Gardon handle_changed_spte_acc_track(iter->old_spte, new_spte, 405f8e14497SBen Gardon iter->level); 406a6a0b05dSBen Gardon if (record_dirty_log) 407a6a0b05dSBen Gardon handle_changed_spte_dirty_log(kvm, as_id, iter->gfn, 408a6a0b05dSBen Gardon iter->old_spte, new_spte, 409a6a0b05dSBen Gardon iter->level); 410f8e14497SBen Gardon } 411f8e14497SBen Gardon 412f8e14497SBen Gardon static inline void tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter, 413f8e14497SBen Gardon u64 new_spte) 414f8e14497SBen Gardon { 415a6a0b05dSBen Gardon __tdp_mmu_set_spte(kvm, iter, new_spte, true, true); 416f8e14497SBen Gardon } 417f8e14497SBen Gardon 418f8e14497SBen Gardon static inline void tdp_mmu_set_spte_no_acc_track(struct kvm *kvm, 419f8e14497SBen Gardon struct tdp_iter *iter, 420f8e14497SBen Gardon u64 new_spte) 421f8e14497SBen Gardon { 422a6a0b05dSBen Gardon __tdp_mmu_set_spte(kvm, iter, new_spte, false, true); 423a6a0b05dSBen Gardon } 424a6a0b05dSBen Gardon 425a6a0b05dSBen Gardon static inline void tdp_mmu_set_spte_no_dirty_log(struct kvm *kvm, 426a6a0b05dSBen Gardon struct tdp_iter *iter, 427a6a0b05dSBen Gardon u64 new_spte) 428a6a0b05dSBen Gardon { 429a6a0b05dSBen Gardon __tdp_mmu_set_spte(kvm, iter, new_spte, true, false); 430faaf05b0SBen Gardon } 431faaf05b0SBen Gardon 432faaf05b0SBen Gardon #define tdp_root_for_each_pte(_iter, _root, _start, _end) \ 433faaf05b0SBen Gardon for_each_tdp_pte(_iter, _root->spt, _root->role.level, _start, _end) 434faaf05b0SBen Gardon 435f8e14497SBen Gardon #define tdp_root_for_each_leaf_pte(_iter, _root, _start, _end) \ 436f8e14497SBen Gardon tdp_root_for_each_pte(_iter, _root, _start, _end) \ 437f8e14497SBen Gardon if (!is_shadow_present_pte(_iter.old_spte) || \ 438f8e14497SBen Gardon !is_last_spte(_iter.old_spte, _iter.level)) \ 439f8e14497SBen Gardon continue; \ 440f8e14497SBen Gardon else 441f8e14497SBen Gardon 442bb18842eSBen Gardon #define tdp_mmu_for_each_pte(_iter, _mmu, _start, _end) \ 443bb18842eSBen Gardon for_each_tdp_pte(_iter, __va(_mmu->root_hpa), \ 444bb18842eSBen Gardon _mmu->shadow_root_level, _start, _end) 445bb18842eSBen Gardon 446faaf05b0SBen Gardon /* 447e28a436cSBen Gardon * Yield if the MMU lock is contended or this thread needs to return control 448e28a436cSBen Gardon * to the scheduler. 449e28a436cSBen Gardon * 450e139a34eSBen Gardon * If this function should yield and flush is set, it will perform a remote 451e139a34eSBen Gardon * TLB flush before yielding. 452e139a34eSBen Gardon * 453e28a436cSBen Gardon * If this function yields, it will also reset the tdp_iter's walk over the 454*ed5e484bSBen Gardon * paging structure and the calling function should skip to the next 455*ed5e484bSBen Gardon * iteration to allow the iterator to continue its traversal from the 456*ed5e484bSBen Gardon * paging structure root. 457e28a436cSBen Gardon * 458e28a436cSBen Gardon * Return true if this function yielded and the iterator's traversal was reset. 459e28a436cSBen Gardon * Return false if a yield was not needed. 460e28a436cSBen Gardon */ 461e139a34eSBen Gardon static inline bool tdp_mmu_iter_cond_resched(struct kvm *kvm, 462e139a34eSBen Gardon struct tdp_iter *iter, bool flush) 463a6a0b05dSBen Gardon { 464*ed5e484bSBen Gardon /* Ensure forward progress has been made before yielding. */ 465*ed5e484bSBen Gardon if (iter->next_last_level_gfn == iter->yielded_gfn) 466*ed5e484bSBen Gardon return false; 467*ed5e484bSBen Gardon 468a6a0b05dSBen Gardon if (need_resched() || spin_needbreak(&kvm->mmu_lock)) { 469e139a34eSBen Gardon if (flush) 470e139a34eSBen Gardon kvm_flush_remote_tlbs(kvm); 471e139a34eSBen Gardon 472a6a0b05dSBen Gardon cond_resched_lock(&kvm->mmu_lock); 473*ed5e484bSBen Gardon 474*ed5e484bSBen Gardon WARN_ON(iter->gfn > iter->next_last_level_gfn); 475*ed5e484bSBen Gardon 476*ed5e484bSBen Gardon tdp_iter_start(iter, iter->pt_path[iter->root_level - 1], 477*ed5e484bSBen Gardon iter->root_level, iter->min_level, 478*ed5e484bSBen Gardon iter->next_last_level_gfn); 479*ed5e484bSBen Gardon 480e28a436cSBen Gardon return true; 481a6a0b05dSBen Gardon } 482e28a436cSBen Gardon 483e28a436cSBen Gardon return false; 484a6a0b05dSBen Gardon } 485a6a0b05dSBen Gardon 486faaf05b0SBen Gardon /* 487faaf05b0SBen Gardon * Tears down the mappings for the range of gfns, [start, end), and frees the 488faaf05b0SBen Gardon * non-root pages mapping GFNs strictly within that range. Returns true if 489faaf05b0SBen Gardon * SPTEs have been cleared and a TLB flush is needed before releasing the 490faaf05b0SBen Gardon * MMU lock. 491063afacdSBen Gardon * If can_yield is true, will release the MMU lock and reschedule if the 492063afacdSBen Gardon * scheduler needs the CPU or there is contention on the MMU lock. If this 493063afacdSBen Gardon * function cannot yield, it will not release the MMU lock or reschedule and 494063afacdSBen Gardon * the caller must ensure it does not supply too large a GFN range, or the 495063afacdSBen Gardon * operation can cause a soft lockup. 496faaf05b0SBen Gardon */ 497faaf05b0SBen Gardon static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 498063afacdSBen Gardon gfn_t start, gfn_t end, bool can_yield) 499faaf05b0SBen Gardon { 500faaf05b0SBen Gardon struct tdp_iter iter; 501faaf05b0SBen Gardon bool flush_needed = false; 502faaf05b0SBen Gardon 503faaf05b0SBen Gardon tdp_root_for_each_pte(iter, root, start, end) { 504faaf05b0SBen Gardon if (!is_shadow_present_pte(iter.old_spte)) 505faaf05b0SBen Gardon continue; 506faaf05b0SBen Gardon 507faaf05b0SBen Gardon /* 508faaf05b0SBen Gardon * If this is a non-last-level SPTE that covers a larger range 509faaf05b0SBen Gardon * than should be zapped, continue, and zap the mappings at a 510faaf05b0SBen Gardon * lower level. 511faaf05b0SBen Gardon */ 512faaf05b0SBen Gardon if ((iter.gfn < start || 513faaf05b0SBen Gardon iter.gfn + KVM_PAGES_PER_HPAGE(iter.level) > end) && 514faaf05b0SBen Gardon !is_last_spte(iter.old_spte, iter.level)) 515faaf05b0SBen Gardon continue; 516faaf05b0SBen Gardon 517faaf05b0SBen Gardon tdp_mmu_set_spte(kvm, &iter, 0); 518faaf05b0SBen Gardon 519*ed5e484bSBen Gardon flush_needed = !(can_yield && 520*ed5e484bSBen Gardon tdp_mmu_iter_cond_resched(kvm, &iter, true)); 521faaf05b0SBen Gardon } 522faaf05b0SBen Gardon return flush_needed; 523faaf05b0SBen Gardon } 524faaf05b0SBen Gardon 525faaf05b0SBen Gardon /* 526faaf05b0SBen Gardon * Tears down the mappings for the range of gfns, [start, end), and frees the 527faaf05b0SBen Gardon * non-root pages mapping GFNs strictly within that range. Returns true if 528faaf05b0SBen Gardon * SPTEs have been cleared and a TLB flush is needed before releasing the 529faaf05b0SBen Gardon * MMU lock. 530faaf05b0SBen Gardon */ 531faaf05b0SBen Gardon bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end) 532faaf05b0SBen Gardon { 533faaf05b0SBen Gardon struct kvm_mmu_page *root; 534faaf05b0SBen Gardon bool flush = false; 535faaf05b0SBen Gardon 536a889ea54SBen Gardon for_each_tdp_mmu_root_yield_safe(kvm, root) 537063afacdSBen Gardon flush |= zap_gfn_range(kvm, root, start, end, true); 538faaf05b0SBen Gardon 539faaf05b0SBen Gardon return flush; 540faaf05b0SBen Gardon } 541faaf05b0SBen Gardon 542faaf05b0SBen Gardon void kvm_tdp_mmu_zap_all(struct kvm *kvm) 543faaf05b0SBen Gardon { 544339f5a7fSRick Edgecombe gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT); 545faaf05b0SBen Gardon bool flush; 546faaf05b0SBen Gardon 547faaf05b0SBen Gardon flush = kvm_tdp_mmu_zap_gfn_range(kvm, 0, max_gfn); 548faaf05b0SBen Gardon if (flush) 549faaf05b0SBen Gardon kvm_flush_remote_tlbs(kvm); 550faaf05b0SBen Gardon } 551bb18842eSBen Gardon 552bb18842eSBen Gardon /* 553bb18842eSBen Gardon * Installs a last-level SPTE to handle a TDP page fault. 554bb18842eSBen Gardon * (NPT/EPT violation/misconfiguration) 555bb18842eSBen Gardon */ 556bb18842eSBen Gardon static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, int write, 557bb18842eSBen Gardon int map_writable, 558bb18842eSBen Gardon struct tdp_iter *iter, 559bb18842eSBen Gardon kvm_pfn_t pfn, bool prefault) 560bb18842eSBen Gardon { 561bb18842eSBen Gardon u64 new_spte; 562bb18842eSBen Gardon int ret = 0; 563bb18842eSBen Gardon int make_spte_ret = 0; 564bb18842eSBen Gardon 565bb18842eSBen Gardon if (unlikely(is_noslot_pfn(pfn))) { 566bb18842eSBen Gardon new_spte = make_mmio_spte(vcpu, iter->gfn, ACC_ALL); 567bb18842eSBen Gardon trace_mark_mmio_spte(iter->sptep, iter->gfn, new_spte); 56833dd3574SBen Gardon } else { 569bb18842eSBen Gardon make_spte_ret = make_spte(vcpu, ACC_ALL, iter->level, iter->gfn, 570bb18842eSBen Gardon pfn, iter->old_spte, prefault, true, 571bb18842eSBen Gardon map_writable, !shadow_accessed_mask, 572bb18842eSBen Gardon &new_spte); 57333dd3574SBen Gardon trace_kvm_mmu_set_spte(iter->level, iter->gfn, iter->sptep); 57433dd3574SBen Gardon } 575bb18842eSBen Gardon 576bb18842eSBen Gardon if (new_spte == iter->old_spte) 577bb18842eSBen Gardon ret = RET_PF_SPURIOUS; 578bb18842eSBen Gardon else 579bb18842eSBen Gardon tdp_mmu_set_spte(vcpu->kvm, iter, new_spte); 580bb18842eSBen Gardon 581bb18842eSBen Gardon /* 582bb18842eSBen Gardon * If the page fault was caused by a write but the page is write 583bb18842eSBen Gardon * protected, emulation is needed. If the emulation was skipped, 584bb18842eSBen Gardon * the vCPU would have the same fault again. 585bb18842eSBen Gardon */ 586bb18842eSBen Gardon if (make_spte_ret & SET_SPTE_WRITE_PROTECTED_PT) { 587bb18842eSBen Gardon if (write) 588bb18842eSBen Gardon ret = RET_PF_EMULATE; 589bb18842eSBen Gardon kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 590bb18842eSBen Gardon } 591bb18842eSBen Gardon 592bb18842eSBen Gardon /* If a MMIO SPTE is installed, the MMIO will need to be emulated. */ 593bb18842eSBen Gardon if (unlikely(is_mmio_spte(new_spte))) 594bb18842eSBen Gardon ret = RET_PF_EMULATE; 595bb18842eSBen Gardon 596bb18842eSBen Gardon trace_kvm_mmu_set_spte(iter->level, iter->gfn, iter->sptep); 597bb18842eSBen Gardon if (!prefault) 598bb18842eSBen Gardon vcpu->stat.pf_fixed++; 599bb18842eSBen Gardon 600bb18842eSBen Gardon return ret; 601bb18842eSBen Gardon } 602bb18842eSBen Gardon 603bb18842eSBen Gardon /* 604bb18842eSBen Gardon * Handle a TDP page fault (NPT/EPT violation/misconfiguration) by installing 605bb18842eSBen Gardon * page tables and SPTEs to translate the faulting guest physical address. 606bb18842eSBen Gardon */ 607bb18842eSBen Gardon int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, 608bb18842eSBen Gardon int map_writable, int max_level, kvm_pfn_t pfn, 609bb18842eSBen Gardon bool prefault) 610bb18842eSBen Gardon { 611bb18842eSBen Gardon bool nx_huge_page_workaround_enabled = is_nx_huge_page_enabled(); 612bb18842eSBen Gardon bool write = error_code & PFERR_WRITE_MASK; 613bb18842eSBen Gardon bool exec = error_code & PFERR_FETCH_MASK; 614bb18842eSBen Gardon bool huge_page_disallowed = exec && nx_huge_page_workaround_enabled; 615bb18842eSBen Gardon struct kvm_mmu *mmu = vcpu->arch.mmu; 616bb18842eSBen Gardon struct tdp_iter iter; 61789c0fd49SBen Gardon struct kvm_mmu_page *sp; 618bb18842eSBen Gardon u64 *child_pt; 619bb18842eSBen Gardon u64 new_spte; 620bb18842eSBen Gardon int ret; 621bb18842eSBen Gardon gfn_t gfn = gpa >> PAGE_SHIFT; 622bb18842eSBen Gardon int level; 623bb18842eSBen Gardon int req_level; 624bb18842eSBen Gardon 625bb18842eSBen Gardon if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa))) 626bb18842eSBen Gardon return RET_PF_RETRY; 627bb18842eSBen Gardon if (WARN_ON(!is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa))) 628bb18842eSBen Gardon return RET_PF_RETRY; 629bb18842eSBen Gardon 630bb18842eSBen Gardon level = kvm_mmu_hugepage_adjust(vcpu, gfn, max_level, &pfn, 631bb18842eSBen Gardon huge_page_disallowed, &req_level); 632bb18842eSBen Gardon 633bb18842eSBen Gardon trace_kvm_mmu_spte_requested(gpa, level, pfn); 634bb18842eSBen Gardon tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) { 635bb18842eSBen Gardon if (nx_huge_page_workaround_enabled) 636bb18842eSBen Gardon disallowed_hugepage_adjust(iter.old_spte, gfn, 637bb18842eSBen Gardon iter.level, &pfn, &level); 638bb18842eSBen Gardon 639bb18842eSBen Gardon if (iter.level == level) 640bb18842eSBen Gardon break; 641bb18842eSBen Gardon 642bb18842eSBen Gardon /* 643bb18842eSBen Gardon * If there is an SPTE mapping a large page at a higher level 644bb18842eSBen Gardon * than the target, that SPTE must be cleared and replaced 645bb18842eSBen Gardon * with a non-leaf SPTE. 646bb18842eSBen Gardon */ 647bb18842eSBen Gardon if (is_shadow_present_pte(iter.old_spte) && 648bb18842eSBen Gardon is_large_pte(iter.old_spte)) { 649bb18842eSBen Gardon tdp_mmu_set_spte(vcpu->kvm, &iter, 0); 650bb18842eSBen Gardon 651bb18842eSBen Gardon kvm_flush_remote_tlbs_with_address(vcpu->kvm, iter.gfn, 652bb18842eSBen Gardon KVM_PAGES_PER_HPAGE(iter.level)); 653bb18842eSBen Gardon 654bb18842eSBen Gardon /* 655bb18842eSBen Gardon * The iter must explicitly re-read the spte here 656bb18842eSBen Gardon * because the new value informs the !present 657bb18842eSBen Gardon * path below. 658bb18842eSBen Gardon */ 659bb18842eSBen Gardon iter.old_spte = READ_ONCE(*iter.sptep); 660bb18842eSBen Gardon } 661bb18842eSBen Gardon 662bb18842eSBen Gardon if (!is_shadow_present_pte(iter.old_spte)) { 66389c0fd49SBen Gardon sp = alloc_tdp_mmu_page(vcpu, iter.gfn, iter.level); 66489c0fd49SBen Gardon list_add(&sp->link, &vcpu->kvm->arch.tdp_mmu_pages); 66589c0fd49SBen Gardon child_pt = sp->spt; 666bb18842eSBen Gardon new_spte = make_nonleaf_spte(child_pt, 667bb18842eSBen Gardon !shadow_accessed_mask); 668bb18842eSBen Gardon 669bb18842eSBen Gardon trace_kvm_mmu_get_page(sp, true); 67029cf0f50SBen Gardon if (huge_page_disallowed && req_level >= iter.level) 67129cf0f50SBen Gardon account_huge_nx_page(vcpu->kvm, sp); 67229cf0f50SBen Gardon 673bb18842eSBen Gardon tdp_mmu_set_spte(vcpu->kvm, &iter, new_spte); 674bb18842eSBen Gardon } 675bb18842eSBen Gardon } 676bb18842eSBen Gardon 677bb18842eSBen Gardon if (WARN_ON(iter.level != level)) 678bb18842eSBen Gardon return RET_PF_RETRY; 679bb18842eSBen Gardon 680bb18842eSBen Gardon ret = tdp_mmu_map_handle_target_level(vcpu, write, map_writable, &iter, 681bb18842eSBen Gardon pfn, prefault); 682bb18842eSBen Gardon 683bb18842eSBen Gardon return ret; 684bb18842eSBen Gardon } 685063afacdSBen Gardon 686063afacdSBen Gardon static int kvm_tdp_mmu_handle_hva_range(struct kvm *kvm, unsigned long start, 687063afacdSBen Gardon unsigned long end, unsigned long data, 688063afacdSBen Gardon int (*handler)(struct kvm *kvm, struct kvm_memory_slot *slot, 689063afacdSBen Gardon struct kvm_mmu_page *root, gfn_t start, 690063afacdSBen Gardon gfn_t end, unsigned long data)) 691063afacdSBen Gardon { 692063afacdSBen Gardon struct kvm_memslots *slots; 693063afacdSBen Gardon struct kvm_memory_slot *memslot; 694063afacdSBen Gardon struct kvm_mmu_page *root; 695063afacdSBen Gardon int ret = 0; 696063afacdSBen Gardon int as_id; 697063afacdSBen Gardon 698a889ea54SBen Gardon for_each_tdp_mmu_root_yield_safe(kvm, root) { 699063afacdSBen Gardon as_id = kvm_mmu_page_as_id(root); 700063afacdSBen Gardon slots = __kvm_memslots(kvm, as_id); 701063afacdSBen Gardon kvm_for_each_memslot(memslot, slots) { 702063afacdSBen Gardon unsigned long hva_start, hva_end; 703063afacdSBen Gardon gfn_t gfn_start, gfn_end; 704063afacdSBen Gardon 705063afacdSBen Gardon hva_start = max(start, memslot->userspace_addr); 706063afacdSBen Gardon hva_end = min(end, memslot->userspace_addr + 707063afacdSBen Gardon (memslot->npages << PAGE_SHIFT)); 708063afacdSBen Gardon if (hva_start >= hva_end) 709063afacdSBen Gardon continue; 710063afacdSBen Gardon /* 711063afacdSBen Gardon * {gfn(page) | page intersects with [hva_start, hva_end)} = 712063afacdSBen Gardon * {gfn_start, gfn_start+1, ..., gfn_end-1}. 713063afacdSBen Gardon */ 714063afacdSBen Gardon gfn_start = hva_to_gfn_memslot(hva_start, memslot); 715063afacdSBen Gardon gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); 716063afacdSBen Gardon 717063afacdSBen Gardon ret |= handler(kvm, memslot, root, gfn_start, 718063afacdSBen Gardon gfn_end, data); 719063afacdSBen Gardon } 720063afacdSBen Gardon } 721063afacdSBen Gardon 722063afacdSBen Gardon return ret; 723063afacdSBen Gardon } 724063afacdSBen Gardon 725063afacdSBen Gardon static int zap_gfn_range_hva_wrapper(struct kvm *kvm, 726063afacdSBen Gardon struct kvm_memory_slot *slot, 727063afacdSBen Gardon struct kvm_mmu_page *root, gfn_t start, 728063afacdSBen Gardon gfn_t end, unsigned long unused) 729063afacdSBen Gardon { 730063afacdSBen Gardon return zap_gfn_range(kvm, root, start, end, false); 731063afacdSBen Gardon } 732063afacdSBen Gardon 733063afacdSBen Gardon int kvm_tdp_mmu_zap_hva_range(struct kvm *kvm, unsigned long start, 734063afacdSBen Gardon unsigned long end) 735063afacdSBen Gardon { 736063afacdSBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, start, end, 0, 737063afacdSBen Gardon zap_gfn_range_hva_wrapper); 738063afacdSBen Gardon } 739f8e14497SBen Gardon 740f8e14497SBen Gardon /* 741f8e14497SBen Gardon * Mark the SPTEs range of GFNs [start, end) unaccessed and return non-zero 742f8e14497SBen Gardon * if any of the GFNs in the range have been accessed. 743f8e14497SBen Gardon */ 744f8e14497SBen Gardon static int age_gfn_range(struct kvm *kvm, struct kvm_memory_slot *slot, 745f8e14497SBen Gardon struct kvm_mmu_page *root, gfn_t start, gfn_t end, 746f8e14497SBen Gardon unsigned long unused) 747f8e14497SBen Gardon { 748f8e14497SBen Gardon struct tdp_iter iter; 749f8e14497SBen Gardon int young = 0; 750f8e14497SBen Gardon u64 new_spte = 0; 751f8e14497SBen Gardon 752f8e14497SBen Gardon tdp_root_for_each_leaf_pte(iter, root, start, end) { 753f8e14497SBen Gardon /* 754f8e14497SBen Gardon * If we have a non-accessed entry we don't need to change the 755f8e14497SBen Gardon * pte. 756f8e14497SBen Gardon */ 757f8e14497SBen Gardon if (!is_accessed_spte(iter.old_spte)) 758f8e14497SBen Gardon continue; 759f8e14497SBen Gardon 760f8e14497SBen Gardon new_spte = iter.old_spte; 761f8e14497SBen Gardon 762f8e14497SBen Gardon if (spte_ad_enabled(new_spte)) { 763f8e14497SBen Gardon clear_bit((ffs(shadow_accessed_mask) - 1), 764f8e14497SBen Gardon (unsigned long *)&new_spte); 765f8e14497SBen Gardon } else { 766f8e14497SBen Gardon /* 767f8e14497SBen Gardon * Capture the dirty status of the page, so that it doesn't get 768f8e14497SBen Gardon * lost when the SPTE is marked for access tracking. 769f8e14497SBen Gardon */ 770f8e14497SBen Gardon if (is_writable_pte(new_spte)) 771f8e14497SBen Gardon kvm_set_pfn_dirty(spte_to_pfn(new_spte)); 772f8e14497SBen Gardon 773f8e14497SBen Gardon new_spte = mark_spte_for_access_track(new_spte); 774f8e14497SBen Gardon } 775a6a0b05dSBen Gardon new_spte &= ~shadow_dirty_mask; 776f8e14497SBen Gardon 777f8e14497SBen Gardon tdp_mmu_set_spte_no_acc_track(kvm, &iter, new_spte); 778f8e14497SBen Gardon young = 1; 77933dd3574SBen Gardon 78033dd3574SBen Gardon trace_kvm_age_page(iter.gfn, iter.level, slot, young); 781f8e14497SBen Gardon } 782f8e14497SBen Gardon 783f8e14497SBen Gardon return young; 784f8e14497SBen Gardon } 785f8e14497SBen Gardon 786f8e14497SBen Gardon int kvm_tdp_mmu_age_hva_range(struct kvm *kvm, unsigned long start, 787f8e14497SBen Gardon unsigned long end) 788f8e14497SBen Gardon { 789f8e14497SBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, start, end, 0, 790f8e14497SBen Gardon age_gfn_range); 791f8e14497SBen Gardon } 792f8e14497SBen Gardon 793f8e14497SBen Gardon static int test_age_gfn(struct kvm *kvm, struct kvm_memory_slot *slot, 794f8e14497SBen Gardon struct kvm_mmu_page *root, gfn_t gfn, gfn_t unused, 795f8e14497SBen Gardon unsigned long unused2) 796f8e14497SBen Gardon { 797f8e14497SBen Gardon struct tdp_iter iter; 798f8e14497SBen Gardon 799f8e14497SBen Gardon tdp_root_for_each_leaf_pte(iter, root, gfn, gfn + 1) 800f8e14497SBen Gardon if (is_accessed_spte(iter.old_spte)) 801f8e14497SBen Gardon return 1; 802f8e14497SBen Gardon 803f8e14497SBen Gardon return 0; 804f8e14497SBen Gardon } 805f8e14497SBen Gardon 806f8e14497SBen Gardon int kvm_tdp_mmu_test_age_hva(struct kvm *kvm, unsigned long hva) 807f8e14497SBen Gardon { 808f8e14497SBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, hva, hva + 1, 0, 809f8e14497SBen Gardon test_age_gfn); 810f8e14497SBen Gardon } 8111d8dd6b3SBen Gardon 8121d8dd6b3SBen Gardon /* 8131d8dd6b3SBen Gardon * Handle the changed_pte MMU notifier for the TDP MMU. 8141d8dd6b3SBen Gardon * data is a pointer to the new pte_t mapping the HVA specified by the MMU 8151d8dd6b3SBen Gardon * notifier. 8161d8dd6b3SBen Gardon * Returns non-zero if a flush is needed before releasing the MMU lock. 8171d8dd6b3SBen Gardon */ 8181d8dd6b3SBen Gardon static int set_tdp_spte(struct kvm *kvm, struct kvm_memory_slot *slot, 8191d8dd6b3SBen Gardon struct kvm_mmu_page *root, gfn_t gfn, gfn_t unused, 8201d8dd6b3SBen Gardon unsigned long data) 8211d8dd6b3SBen Gardon { 8221d8dd6b3SBen Gardon struct tdp_iter iter; 8231d8dd6b3SBen Gardon pte_t *ptep = (pte_t *)data; 8241d8dd6b3SBen Gardon kvm_pfn_t new_pfn; 8251d8dd6b3SBen Gardon u64 new_spte; 8261d8dd6b3SBen Gardon int need_flush = 0; 8271d8dd6b3SBen Gardon 8281d8dd6b3SBen Gardon WARN_ON(pte_huge(*ptep)); 8291d8dd6b3SBen Gardon 8301d8dd6b3SBen Gardon new_pfn = pte_pfn(*ptep); 8311d8dd6b3SBen Gardon 8321d8dd6b3SBen Gardon tdp_root_for_each_pte(iter, root, gfn, gfn + 1) { 8331d8dd6b3SBen Gardon if (iter.level != PG_LEVEL_4K) 8341d8dd6b3SBen Gardon continue; 8351d8dd6b3SBen Gardon 8361d8dd6b3SBen Gardon if (!is_shadow_present_pte(iter.old_spte)) 8371d8dd6b3SBen Gardon break; 8381d8dd6b3SBen Gardon 8391d8dd6b3SBen Gardon tdp_mmu_set_spte(kvm, &iter, 0); 8401d8dd6b3SBen Gardon 8411d8dd6b3SBen Gardon kvm_flush_remote_tlbs_with_address(kvm, iter.gfn, 1); 8421d8dd6b3SBen Gardon 8431d8dd6b3SBen Gardon if (!pte_write(*ptep)) { 8441d8dd6b3SBen Gardon new_spte = kvm_mmu_changed_pte_notifier_make_spte( 8451d8dd6b3SBen Gardon iter.old_spte, new_pfn); 8461d8dd6b3SBen Gardon 8471d8dd6b3SBen Gardon tdp_mmu_set_spte(kvm, &iter, new_spte); 8481d8dd6b3SBen Gardon } 8491d8dd6b3SBen Gardon 8501d8dd6b3SBen Gardon need_flush = 1; 8511d8dd6b3SBen Gardon } 8521d8dd6b3SBen Gardon 8531d8dd6b3SBen Gardon if (need_flush) 8541d8dd6b3SBen Gardon kvm_flush_remote_tlbs_with_address(kvm, gfn, 1); 8551d8dd6b3SBen Gardon 8561d8dd6b3SBen Gardon return 0; 8571d8dd6b3SBen Gardon } 8581d8dd6b3SBen Gardon 8591d8dd6b3SBen Gardon int kvm_tdp_mmu_set_spte_hva(struct kvm *kvm, unsigned long address, 8601d8dd6b3SBen Gardon pte_t *host_ptep) 8611d8dd6b3SBen Gardon { 8621d8dd6b3SBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, address, address + 1, 8631d8dd6b3SBen Gardon (unsigned long)host_ptep, 8641d8dd6b3SBen Gardon set_tdp_spte); 8651d8dd6b3SBen Gardon } 8661d8dd6b3SBen Gardon 867a6a0b05dSBen Gardon /* 868a6a0b05dSBen Gardon * Remove write access from all the SPTEs mapping GFNs [start, end). If 869a6a0b05dSBen Gardon * skip_4k is set, SPTEs that map 4k pages, will not be write-protected. 870a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 871a6a0b05dSBen Gardon */ 872a6a0b05dSBen Gardon static bool wrprot_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 873a6a0b05dSBen Gardon gfn_t start, gfn_t end, int min_level) 874a6a0b05dSBen Gardon { 875a6a0b05dSBen Gardon struct tdp_iter iter; 876a6a0b05dSBen Gardon u64 new_spte; 877a6a0b05dSBen Gardon bool spte_set = false; 878a6a0b05dSBen Gardon 879a6a0b05dSBen Gardon BUG_ON(min_level > KVM_MAX_HUGEPAGE_LEVEL); 880a6a0b05dSBen Gardon 881a6a0b05dSBen Gardon for_each_tdp_pte_min_level(iter, root->spt, root->role.level, 882a6a0b05dSBen Gardon min_level, start, end) { 883a6a0b05dSBen Gardon if (!is_shadow_present_pte(iter.old_spte) || 884a6a0b05dSBen Gardon !is_last_spte(iter.old_spte, iter.level)) 885a6a0b05dSBen Gardon continue; 886a6a0b05dSBen Gardon 887a6a0b05dSBen Gardon new_spte = iter.old_spte & ~PT_WRITABLE_MASK; 888a6a0b05dSBen Gardon 889a6a0b05dSBen Gardon tdp_mmu_set_spte_no_dirty_log(kvm, &iter, new_spte); 890a6a0b05dSBen Gardon spte_set = true; 891a6a0b05dSBen Gardon 892e139a34eSBen Gardon tdp_mmu_iter_cond_resched(kvm, &iter, false); 893a6a0b05dSBen Gardon } 894a6a0b05dSBen Gardon return spte_set; 895a6a0b05dSBen Gardon } 896a6a0b05dSBen Gardon 897a6a0b05dSBen Gardon /* 898a6a0b05dSBen Gardon * Remove write access from all the SPTEs mapping GFNs in the memslot. Will 899a6a0b05dSBen Gardon * only affect leaf SPTEs down to min_level. 900a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 901a6a0b05dSBen Gardon */ 902a6a0b05dSBen Gardon bool kvm_tdp_mmu_wrprot_slot(struct kvm *kvm, struct kvm_memory_slot *slot, 903a6a0b05dSBen Gardon int min_level) 904a6a0b05dSBen Gardon { 905a6a0b05dSBen Gardon struct kvm_mmu_page *root; 906a6a0b05dSBen Gardon int root_as_id; 907a6a0b05dSBen Gardon bool spte_set = false; 908a6a0b05dSBen Gardon 909a889ea54SBen Gardon for_each_tdp_mmu_root_yield_safe(kvm, root) { 910a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 911a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 912a6a0b05dSBen Gardon continue; 913a6a0b05dSBen Gardon 914a6a0b05dSBen Gardon spte_set |= wrprot_gfn_range(kvm, root, slot->base_gfn, 915a6a0b05dSBen Gardon slot->base_gfn + slot->npages, min_level); 916a6a0b05dSBen Gardon } 917a6a0b05dSBen Gardon 918a6a0b05dSBen Gardon return spte_set; 919a6a0b05dSBen Gardon } 920a6a0b05dSBen Gardon 921a6a0b05dSBen Gardon /* 922a6a0b05dSBen Gardon * Clear the dirty status of all the SPTEs mapping GFNs in the memslot. If 923a6a0b05dSBen Gardon * AD bits are enabled, this will involve clearing the dirty bit on each SPTE. 924a6a0b05dSBen Gardon * If AD bits are not enabled, this will require clearing the writable bit on 925a6a0b05dSBen Gardon * each SPTE. Returns true if an SPTE has been changed and the TLBs need to 926a6a0b05dSBen Gardon * be flushed. 927a6a0b05dSBen Gardon */ 928a6a0b05dSBen Gardon static bool clear_dirty_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 929a6a0b05dSBen Gardon gfn_t start, gfn_t end) 930a6a0b05dSBen Gardon { 931a6a0b05dSBen Gardon struct tdp_iter iter; 932a6a0b05dSBen Gardon u64 new_spte; 933a6a0b05dSBen Gardon bool spte_set = false; 934a6a0b05dSBen Gardon 935a6a0b05dSBen Gardon tdp_root_for_each_leaf_pte(iter, root, start, end) { 936a6a0b05dSBen Gardon if (spte_ad_need_write_protect(iter.old_spte)) { 937a6a0b05dSBen Gardon if (is_writable_pte(iter.old_spte)) 938a6a0b05dSBen Gardon new_spte = iter.old_spte & ~PT_WRITABLE_MASK; 939a6a0b05dSBen Gardon else 940a6a0b05dSBen Gardon continue; 941a6a0b05dSBen Gardon } else { 942a6a0b05dSBen Gardon if (iter.old_spte & shadow_dirty_mask) 943a6a0b05dSBen Gardon new_spte = iter.old_spte & ~shadow_dirty_mask; 944a6a0b05dSBen Gardon else 945a6a0b05dSBen Gardon continue; 946a6a0b05dSBen Gardon } 947a6a0b05dSBen Gardon 948a6a0b05dSBen Gardon tdp_mmu_set_spte_no_dirty_log(kvm, &iter, new_spte); 949a6a0b05dSBen Gardon spte_set = true; 950a6a0b05dSBen Gardon 951e139a34eSBen Gardon tdp_mmu_iter_cond_resched(kvm, &iter, false); 952a6a0b05dSBen Gardon } 953a6a0b05dSBen Gardon return spte_set; 954a6a0b05dSBen Gardon } 955a6a0b05dSBen Gardon 956a6a0b05dSBen Gardon /* 957a6a0b05dSBen Gardon * Clear the dirty status of all the SPTEs mapping GFNs in the memslot. If 958a6a0b05dSBen Gardon * AD bits are enabled, this will involve clearing the dirty bit on each SPTE. 959a6a0b05dSBen Gardon * If AD bits are not enabled, this will require clearing the writable bit on 960a6a0b05dSBen Gardon * each SPTE. Returns true if an SPTE has been changed and the TLBs need to 961a6a0b05dSBen Gardon * be flushed. 962a6a0b05dSBen Gardon */ 963a6a0b05dSBen Gardon bool kvm_tdp_mmu_clear_dirty_slot(struct kvm *kvm, struct kvm_memory_slot *slot) 964a6a0b05dSBen Gardon { 965a6a0b05dSBen Gardon struct kvm_mmu_page *root; 966a6a0b05dSBen Gardon int root_as_id; 967a6a0b05dSBen Gardon bool spte_set = false; 968a6a0b05dSBen Gardon 969a889ea54SBen Gardon for_each_tdp_mmu_root_yield_safe(kvm, root) { 970a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 971a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 972a6a0b05dSBen Gardon continue; 973a6a0b05dSBen Gardon 974a6a0b05dSBen Gardon spte_set |= clear_dirty_gfn_range(kvm, root, slot->base_gfn, 975a6a0b05dSBen Gardon slot->base_gfn + slot->npages); 976a6a0b05dSBen Gardon } 977a6a0b05dSBen Gardon 978a6a0b05dSBen Gardon return spte_set; 979a6a0b05dSBen Gardon } 980a6a0b05dSBen Gardon 981a6a0b05dSBen Gardon /* 982a6a0b05dSBen Gardon * Clears the dirty status of all the 4k SPTEs mapping GFNs for which a bit is 983a6a0b05dSBen Gardon * set in mask, starting at gfn. The given memslot is expected to contain all 984a6a0b05dSBen Gardon * the GFNs represented by set bits in the mask. If AD bits are enabled, 985a6a0b05dSBen Gardon * clearing the dirty status will involve clearing the dirty bit on each SPTE 986a6a0b05dSBen Gardon * or, if AD bits are not enabled, clearing the writable bit on each SPTE. 987a6a0b05dSBen Gardon */ 988a6a0b05dSBen Gardon static void clear_dirty_pt_masked(struct kvm *kvm, struct kvm_mmu_page *root, 989a6a0b05dSBen Gardon gfn_t gfn, unsigned long mask, bool wrprot) 990a6a0b05dSBen Gardon { 991a6a0b05dSBen Gardon struct tdp_iter iter; 992a6a0b05dSBen Gardon u64 new_spte; 993a6a0b05dSBen Gardon 994a6a0b05dSBen Gardon tdp_root_for_each_leaf_pte(iter, root, gfn + __ffs(mask), 995a6a0b05dSBen Gardon gfn + BITS_PER_LONG) { 996a6a0b05dSBen Gardon if (!mask) 997a6a0b05dSBen Gardon break; 998a6a0b05dSBen Gardon 999a6a0b05dSBen Gardon if (iter.level > PG_LEVEL_4K || 1000a6a0b05dSBen Gardon !(mask & (1UL << (iter.gfn - gfn)))) 1001a6a0b05dSBen Gardon continue; 1002a6a0b05dSBen Gardon 1003a6a0b05dSBen Gardon if (wrprot || spte_ad_need_write_protect(iter.old_spte)) { 1004a6a0b05dSBen Gardon if (is_writable_pte(iter.old_spte)) 1005a6a0b05dSBen Gardon new_spte = iter.old_spte & ~PT_WRITABLE_MASK; 1006a6a0b05dSBen Gardon else 1007a6a0b05dSBen Gardon continue; 1008a6a0b05dSBen Gardon } else { 1009a6a0b05dSBen Gardon if (iter.old_spte & shadow_dirty_mask) 1010a6a0b05dSBen Gardon new_spte = iter.old_spte & ~shadow_dirty_mask; 1011a6a0b05dSBen Gardon else 1012a6a0b05dSBen Gardon continue; 1013a6a0b05dSBen Gardon } 1014a6a0b05dSBen Gardon 1015a6a0b05dSBen Gardon tdp_mmu_set_spte_no_dirty_log(kvm, &iter, new_spte); 1016a6a0b05dSBen Gardon 1017a6a0b05dSBen Gardon mask &= ~(1UL << (iter.gfn - gfn)); 1018a6a0b05dSBen Gardon } 1019a6a0b05dSBen Gardon } 1020a6a0b05dSBen Gardon 1021a6a0b05dSBen Gardon /* 1022a6a0b05dSBen Gardon * Clears the dirty status of all the 4k SPTEs mapping GFNs for which a bit is 1023a6a0b05dSBen Gardon * set in mask, starting at gfn. The given memslot is expected to contain all 1024a6a0b05dSBen Gardon * the GFNs represented by set bits in the mask. If AD bits are enabled, 1025a6a0b05dSBen Gardon * clearing the dirty status will involve clearing the dirty bit on each SPTE 1026a6a0b05dSBen Gardon * or, if AD bits are not enabled, clearing the writable bit on each SPTE. 1027a6a0b05dSBen Gardon */ 1028a6a0b05dSBen Gardon void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm, 1029a6a0b05dSBen Gardon struct kvm_memory_slot *slot, 1030a6a0b05dSBen Gardon gfn_t gfn, unsigned long mask, 1031a6a0b05dSBen Gardon bool wrprot) 1032a6a0b05dSBen Gardon { 1033a6a0b05dSBen Gardon struct kvm_mmu_page *root; 1034a6a0b05dSBen Gardon int root_as_id; 1035a6a0b05dSBen Gardon 1036a6a0b05dSBen Gardon lockdep_assert_held(&kvm->mmu_lock); 1037a6a0b05dSBen Gardon for_each_tdp_mmu_root(kvm, root) { 1038a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 1039a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 1040a6a0b05dSBen Gardon continue; 1041a6a0b05dSBen Gardon 1042a6a0b05dSBen Gardon clear_dirty_pt_masked(kvm, root, gfn, mask, wrprot); 1043a6a0b05dSBen Gardon } 1044a6a0b05dSBen Gardon } 1045a6a0b05dSBen Gardon 1046a6a0b05dSBen Gardon /* 1047a6a0b05dSBen Gardon * Set the dirty status of all the SPTEs mapping GFNs in the memslot. This is 1048a6a0b05dSBen Gardon * only used for PML, and so will involve setting the dirty bit on each SPTE. 1049a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 1050a6a0b05dSBen Gardon */ 1051a6a0b05dSBen Gardon static bool set_dirty_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 1052a6a0b05dSBen Gardon gfn_t start, gfn_t end) 1053a6a0b05dSBen Gardon { 1054a6a0b05dSBen Gardon struct tdp_iter iter; 1055a6a0b05dSBen Gardon u64 new_spte; 1056a6a0b05dSBen Gardon bool spte_set = false; 1057a6a0b05dSBen Gardon 1058a6a0b05dSBen Gardon tdp_root_for_each_pte(iter, root, start, end) { 1059a6a0b05dSBen Gardon if (!is_shadow_present_pte(iter.old_spte)) 1060a6a0b05dSBen Gardon continue; 1061a6a0b05dSBen Gardon 1062a6a0b05dSBen Gardon new_spte = iter.old_spte | shadow_dirty_mask; 1063a6a0b05dSBen Gardon 1064a6a0b05dSBen Gardon tdp_mmu_set_spte(kvm, &iter, new_spte); 1065a6a0b05dSBen Gardon spte_set = true; 1066a6a0b05dSBen Gardon 1067e139a34eSBen Gardon tdp_mmu_iter_cond_resched(kvm, &iter, false); 1068a6a0b05dSBen Gardon } 1069a6a0b05dSBen Gardon 1070a6a0b05dSBen Gardon return spte_set; 1071a6a0b05dSBen Gardon } 1072a6a0b05dSBen Gardon 1073a6a0b05dSBen Gardon /* 1074a6a0b05dSBen Gardon * Set the dirty status of all the SPTEs mapping GFNs in the memslot. This is 1075a6a0b05dSBen Gardon * only used for PML, and so will involve setting the dirty bit on each SPTE. 1076a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 1077a6a0b05dSBen Gardon */ 1078a6a0b05dSBen Gardon bool kvm_tdp_mmu_slot_set_dirty(struct kvm *kvm, struct kvm_memory_slot *slot) 1079a6a0b05dSBen Gardon { 1080a6a0b05dSBen Gardon struct kvm_mmu_page *root; 1081a6a0b05dSBen Gardon int root_as_id; 1082a6a0b05dSBen Gardon bool spte_set = false; 1083a6a0b05dSBen Gardon 1084a889ea54SBen Gardon for_each_tdp_mmu_root_yield_safe(kvm, root) { 1085a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 1086a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 1087a6a0b05dSBen Gardon continue; 1088a6a0b05dSBen Gardon 1089a6a0b05dSBen Gardon spte_set |= set_dirty_gfn_range(kvm, root, slot->base_gfn, 1090a6a0b05dSBen Gardon slot->base_gfn + slot->npages); 1091a6a0b05dSBen Gardon } 1092a6a0b05dSBen Gardon return spte_set; 1093a6a0b05dSBen Gardon } 1094a6a0b05dSBen Gardon 109514881998SBen Gardon /* 109687aa9ec9SBen Gardon * Clear leaf entries which could be replaced by large mappings, for 109787aa9ec9SBen Gardon * GFNs within the slot. 109814881998SBen Gardon */ 109914881998SBen Gardon static void zap_collapsible_spte_range(struct kvm *kvm, 110014881998SBen Gardon struct kvm_mmu_page *root, 110114881998SBen Gardon gfn_t start, gfn_t end) 110214881998SBen Gardon { 110314881998SBen Gardon struct tdp_iter iter; 110414881998SBen Gardon kvm_pfn_t pfn; 110514881998SBen Gardon bool spte_set = false; 110614881998SBen Gardon 110714881998SBen Gardon tdp_root_for_each_pte(iter, root, start, end) { 110814881998SBen Gardon if (!is_shadow_present_pte(iter.old_spte) || 110987aa9ec9SBen Gardon !is_last_spte(iter.old_spte, iter.level)) 111014881998SBen Gardon continue; 111114881998SBen Gardon 111214881998SBen Gardon pfn = spte_to_pfn(iter.old_spte); 111314881998SBen Gardon if (kvm_is_reserved_pfn(pfn) || 111414881998SBen Gardon !PageTransCompoundMap(pfn_to_page(pfn))) 111514881998SBen Gardon continue; 111614881998SBen Gardon 111714881998SBen Gardon tdp_mmu_set_spte(kvm, &iter, 0); 111814881998SBen Gardon 1119e139a34eSBen Gardon spte_set = !tdp_mmu_iter_cond_resched(kvm, &iter, true); 112014881998SBen Gardon } 112114881998SBen Gardon 112214881998SBen Gardon if (spte_set) 112314881998SBen Gardon kvm_flush_remote_tlbs(kvm); 112414881998SBen Gardon } 112514881998SBen Gardon 112614881998SBen Gardon /* 112714881998SBen Gardon * Clear non-leaf entries (and free associated page tables) which could 112814881998SBen Gardon * be replaced by large mappings, for GFNs within the slot. 112914881998SBen Gardon */ 113014881998SBen Gardon void kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm, 113114881998SBen Gardon const struct kvm_memory_slot *slot) 113214881998SBen Gardon { 113314881998SBen Gardon struct kvm_mmu_page *root; 113414881998SBen Gardon int root_as_id; 113514881998SBen Gardon 1136a889ea54SBen Gardon for_each_tdp_mmu_root_yield_safe(kvm, root) { 113714881998SBen Gardon root_as_id = kvm_mmu_page_as_id(root); 113814881998SBen Gardon if (root_as_id != slot->as_id) 113914881998SBen Gardon continue; 114014881998SBen Gardon 114114881998SBen Gardon zap_collapsible_spte_range(kvm, root, slot->base_gfn, 114214881998SBen Gardon slot->base_gfn + slot->npages); 114314881998SBen Gardon } 114414881998SBen Gardon } 114546044f72SBen Gardon 114646044f72SBen Gardon /* 114746044f72SBen Gardon * Removes write access on the last level SPTE mapping this GFN and unsets the 114846044f72SBen Gardon * SPTE_MMU_WRITABLE bit to ensure future writes continue to be intercepted. 114946044f72SBen Gardon * Returns true if an SPTE was set and a TLB flush is needed. 115046044f72SBen Gardon */ 115146044f72SBen Gardon static bool write_protect_gfn(struct kvm *kvm, struct kvm_mmu_page *root, 115246044f72SBen Gardon gfn_t gfn) 115346044f72SBen Gardon { 115446044f72SBen Gardon struct tdp_iter iter; 115546044f72SBen Gardon u64 new_spte; 115646044f72SBen Gardon bool spte_set = false; 115746044f72SBen Gardon 115846044f72SBen Gardon tdp_root_for_each_leaf_pte(iter, root, gfn, gfn + 1) { 115946044f72SBen Gardon if (!is_writable_pte(iter.old_spte)) 116046044f72SBen Gardon break; 116146044f72SBen Gardon 116246044f72SBen Gardon new_spte = iter.old_spte & 116346044f72SBen Gardon ~(PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE); 116446044f72SBen Gardon 116546044f72SBen Gardon tdp_mmu_set_spte(kvm, &iter, new_spte); 116646044f72SBen Gardon spte_set = true; 116746044f72SBen Gardon } 116846044f72SBen Gardon 116946044f72SBen Gardon return spte_set; 117046044f72SBen Gardon } 117146044f72SBen Gardon 117246044f72SBen Gardon /* 117346044f72SBen Gardon * Removes write access on the last level SPTE mapping this GFN and unsets the 117446044f72SBen Gardon * SPTE_MMU_WRITABLE bit to ensure future writes continue to be intercepted. 117546044f72SBen Gardon * Returns true if an SPTE was set and a TLB flush is needed. 117646044f72SBen Gardon */ 117746044f72SBen Gardon bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm, 117846044f72SBen Gardon struct kvm_memory_slot *slot, gfn_t gfn) 117946044f72SBen Gardon { 118046044f72SBen Gardon struct kvm_mmu_page *root; 118146044f72SBen Gardon int root_as_id; 118246044f72SBen Gardon bool spte_set = false; 118346044f72SBen Gardon 118446044f72SBen Gardon lockdep_assert_held(&kvm->mmu_lock); 118546044f72SBen Gardon for_each_tdp_mmu_root(kvm, root) { 118646044f72SBen Gardon root_as_id = kvm_mmu_page_as_id(root); 118746044f72SBen Gardon if (root_as_id != slot->as_id) 118846044f72SBen Gardon continue; 118946044f72SBen Gardon 119046044f72SBen Gardon spte_set |= write_protect_gfn(kvm, root, gfn); 119146044f72SBen Gardon } 119246044f72SBen Gardon return spte_set; 119346044f72SBen Gardon } 119446044f72SBen Gardon 119595fb5b02SBen Gardon /* 119695fb5b02SBen Gardon * Return the level of the lowest level SPTE added to sptes. 119795fb5b02SBen Gardon * That SPTE may be non-present. 119895fb5b02SBen Gardon */ 119939b4d43eSSean Christopherson int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes, 120039b4d43eSSean Christopherson int *root_level) 120195fb5b02SBen Gardon { 120295fb5b02SBen Gardon struct tdp_iter iter; 120395fb5b02SBen Gardon struct kvm_mmu *mmu = vcpu->arch.mmu; 120495fb5b02SBen Gardon gfn_t gfn = addr >> PAGE_SHIFT; 12052aa07893SSean Christopherson int leaf = -1; 120695fb5b02SBen Gardon 120739b4d43eSSean Christopherson *root_level = vcpu->arch.mmu->shadow_root_level; 120895fb5b02SBen Gardon 120995fb5b02SBen Gardon tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) { 121095fb5b02SBen Gardon leaf = iter.level; 1211dde81f94SSean Christopherson sptes[leaf] = iter.old_spte; 121295fb5b02SBen Gardon } 121395fb5b02SBen Gardon 121495fb5b02SBen Gardon return leaf; 121595fb5b02SBen Gardon } 1216