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 1095fb5b02SBen Gardon #ifdef CONFIG_X86_64 11fe5db27dSBen Gardon static bool __read_mostly tdp_mmu_enabled = false; 1295fb5b02SBen Gardon module_param_named(tdp_mmu, tdp_mmu_enabled, bool, 0644); 1395fb5b02SBen Gardon #endif 14fe5db27dSBen Gardon 15fe5db27dSBen Gardon static bool is_tdp_mmu_enabled(void) 16fe5db27dSBen Gardon { 17fe5db27dSBen Gardon #ifdef CONFIG_X86_64 18fe5db27dSBen Gardon return tdp_enabled && READ_ONCE(tdp_mmu_enabled); 19fe5db27dSBen Gardon #else 20fe5db27dSBen Gardon return false; 21fe5db27dSBen Gardon #endif /* CONFIG_X86_64 */ 22fe5db27dSBen Gardon } 23fe5db27dSBen Gardon 24fe5db27dSBen Gardon /* Initializes the TDP MMU for the VM, if enabled. */ 25fe5db27dSBen Gardon void kvm_mmu_init_tdp_mmu(struct kvm *kvm) 26fe5db27dSBen Gardon { 27fe5db27dSBen Gardon if (!is_tdp_mmu_enabled()) 28fe5db27dSBen Gardon return; 29fe5db27dSBen Gardon 30fe5db27dSBen Gardon /* This should not be changed for the lifetime of the VM. */ 31fe5db27dSBen Gardon kvm->arch.tdp_mmu_enabled = true; 3202c00b3aSBen Gardon 3302c00b3aSBen Gardon INIT_LIST_HEAD(&kvm->arch.tdp_mmu_roots); 3489c0fd49SBen Gardon INIT_LIST_HEAD(&kvm->arch.tdp_mmu_pages); 35fe5db27dSBen Gardon } 36fe5db27dSBen Gardon 37fe5db27dSBen Gardon void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) 38fe5db27dSBen Gardon { 39fe5db27dSBen Gardon if (!kvm->arch.tdp_mmu_enabled) 40fe5db27dSBen Gardon return; 4102c00b3aSBen Gardon 4202c00b3aSBen Gardon WARN_ON(!list_empty(&kvm->arch.tdp_mmu_roots)); 4302c00b3aSBen Gardon } 4402c00b3aSBen Gardon 4502c00b3aSBen Gardon #define for_each_tdp_mmu_root(_kvm, _root) \ 4602c00b3aSBen Gardon list_for_each_entry(_root, &_kvm->arch.tdp_mmu_roots, link) 4702c00b3aSBen Gardon 4802c00b3aSBen Gardon bool is_tdp_mmu_root(struct kvm *kvm, hpa_t hpa) 4902c00b3aSBen Gardon { 5002c00b3aSBen Gardon struct kvm_mmu_page *sp; 5102c00b3aSBen Gardon 52c887c9b9SPaolo Bonzini if (!kvm->arch.tdp_mmu_enabled) 53c887c9b9SPaolo Bonzini return false; 54c887c9b9SPaolo Bonzini if (WARN_ON(!VALID_PAGE(hpa))) 55c887c9b9SPaolo Bonzini return false; 56c887c9b9SPaolo Bonzini 5702c00b3aSBen Gardon sp = to_shadow_page(hpa); 58c887c9b9SPaolo Bonzini if (WARN_ON(!sp)) 59c887c9b9SPaolo Bonzini return false; 6002c00b3aSBen Gardon 6102c00b3aSBen Gardon return sp->tdp_mmu_page && sp->root_count; 6202c00b3aSBen Gardon } 6302c00b3aSBen Gardon 64faaf05b0SBen Gardon static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 65063afacdSBen Gardon gfn_t start, gfn_t end, bool can_yield); 66faaf05b0SBen Gardon 6702c00b3aSBen Gardon void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root) 6802c00b3aSBen Gardon { 69339f5a7fSRick Edgecombe gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT); 70faaf05b0SBen Gardon 7102c00b3aSBen Gardon lockdep_assert_held(&kvm->mmu_lock); 7202c00b3aSBen Gardon 7302c00b3aSBen Gardon WARN_ON(root->root_count); 7402c00b3aSBen Gardon WARN_ON(!root->tdp_mmu_page); 7502c00b3aSBen Gardon 7602c00b3aSBen Gardon list_del(&root->link); 7702c00b3aSBen Gardon 78063afacdSBen Gardon zap_gfn_range(kvm, root, 0, max_gfn, false); 79faaf05b0SBen Gardon 8002c00b3aSBen Gardon free_page((unsigned long)root->spt); 8102c00b3aSBen Gardon kmem_cache_free(mmu_page_header_cache, root); 8202c00b3aSBen Gardon } 8302c00b3aSBen Gardon 8402c00b3aSBen Gardon static union kvm_mmu_page_role page_role_for_level(struct kvm_vcpu *vcpu, 8502c00b3aSBen Gardon int level) 8602c00b3aSBen Gardon { 8702c00b3aSBen Gardon union kvm_mmu_page_role role; 8802c00b3aSBen Gardon 8902c00b3aSBen Gardon role = vcpu->arch.mmu->mmu_role.base; 9002c00b3aSBen Gardon role.level = level; 9102c00b3aSBen Gardon role.direct = true; 9202c00b3aSBen Gardon role.gpte_is_8_bytes = true; 9302c00b3aSBen Gardon role.access = ACC_ALL; 9402c00b3aSBen Gardon 9502c00b3aSBen Gardon return role; 9602c00b3aSBen Gardon } 9702c00b3aSBen Gardon 9802c00b3aSBen Gardon static struct kvm_mmu_page *alloc_tdp_mmu_page(struct kvm_vcpu *vcpu, gfn_t gfn, 9902c00b3aSBen Gardon int level) 10002c00b3aSBen Gardon { 10102c00b3aSBen Gardon struct kvm_mmu_page *sp; 10202c00b3aSBen Gardon 10302c00b3aSBen Gardon sp = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache); 10402c00b3aSBen Gardon sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache); 10502c00b3aSBen Gardon set_page_private(virt_to_page(sp->spt), (unsigned long)sp); 10602c00b3aSBen Gardon 10702c00b3aSBen Gardon sp->role.word = page_role_for_level(vcpu, level).word; 10802c00b3aSBen Gardon sp->gfn = gfn; 10902c00b3aSBen Gardon sp->tdp_mmu_page = true; 11002c00b3aSBen Gardon 11102c00b3aSBen Gardon return sp; 11202c00b3aSBen Gardon } 11302c00b3aSBen Gardon 11402c00b3aSBen Gardon static struct kvm_mmu_page *get_tdp_mmu_vcpu_root(struct kvm_vcpu *vcpu) 11502c00b3aSBen Gardon { 11602c00b3aSBen Gardon union kvm_mmu_page_role role; 11702c00b3aSBen Gardon struct kvm *kvm = vcpu->kvm; 11802c00b3aSBen Gardon struct kvm_mmu_page *root; 11902c00b3aSBen Gardon 12002c00b3aSBen Gardon role = page_role_for_level(vcpu, vcpu->arch.mmu->shadow_root_level); 12102c00b3aSBen Gardon 12202c00b3aSBen Gardon spin_lock(&kvm->mmu_lock); 12302c00b3aSBen Gardon 12402c00b3aSBen Gardon /* Check for an existing root before allocating a new one. */ 12502c00b3aSBen Gardon for_each_tdp_mmu_root(kvm, root) { 12602c00b3aSBen Gardon if (root->role.word == role.word) { 12702c00b3aSBen Gardon kvm_mmu_get_root(kvm, root); 12802c00b3aSBen Gardon spin_unlock(&kvm->mmu_lock); 12902c00b3aSBen Gardon return root; 13002c00b3aSBen Gardon } 13102c00b3aSBen Gardon } 13202c00b3aSBen Gardon 13302c00b3aSBen Gardon root = alloc_tdp_mmu_page(vcpu, 0, vcpu->arch.mmu->shadow_root_level); 13402c00b3aSBen Gardon root->root_count = 1; 13502c00b3aSBen Gardon 13602c00b3aSBen Gardon list_add(&root->link, &kvm->arch.tdp_mmu_roots); 13702c00b3aSBen Gardon 13802c00b3aSBen Gardon spin_unlock(&kvm->mmu_lock); 13902c00b3aSBen Gardon 14002c00b3aSBen Gardon return root; 14102c00b3aSBen Gardon } 14202c00b3aSBen Gardon 14302c00b3aSBen Gardon hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu) 14402c00b3aSBen Gardon { 14502c00b3aSBen Gardon struct kvm_mmu_page *root; 14602c00b3aSBen Gardon 14702c00b3aSBen Gardon root = get_tdp_mmu_vcpu_root(vcpu); 14802c00b3aSBen Gardon if (!root) 14902c00b3aSBen Gardon return INVALID_PAGE; 15002c00b3aSBen Gardon 15102c00b3aSBen Gardon return __pa(root->spt); 152fe5db27dSBen Gardon } 1532f2fad08SBen Gardon 1542f2fad08SBen Gardon static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, 1552f2fad08SBen Gardon u64 old_spte, u64 new_spte, int level); 1562f2fad08SBen Gardon 157faaf05b0SBen Gardon static int kvm_mmu_page_as_id(struct kvm_mmu_page *sp) 158faaf05b0SBen Gardon { 159faaf05b0SBen Gardon return sp->role.smm ? 1 : 0; 160faaf05b0SBen Gardon } 161faaf05b0SBen Gardon 162f8e14497SBen Gardon static void handle_changed_spte_acc_track(u64 old_spte, u64 new_spte, int level) 163f8e14497SBen Gardon { 164f8e14497SBen Gardon bool pfn_changed = spte_to_pfn(old_spte) != spte_to_pfn(new_spte); 165f8e14497SBen Gardon 166f8e14497SBen Gardon if (!is_shadow_present_pte(old_spte) || !is_last_spte(old_spte, level)) 167f8e14497SBen Gardon return; 168f8e14497SBen Gardon 169f8e14497SBen Gardon if (is_accessed_spte(old_spte) && 170f8e14497SBen Gardon (!is_accessed_spte(new_spte) || pfn_changed)) 171f8e14497SBen Gardon kvm_set_pfn_accessed(spte_to_pfn(old_spte)); 172f8e14497SBen Gardon } 173f8e14497SBen Gardon 174a6a0b05dSBen Gardon static void handle_changed_spte_dirty_log(struct kvm *kvm, int as_id, gfn_t gfn, 175a6a0b05dSBen Gardon u64 old_spte, u64 new_spte, int level) 176a6a0b05dSBen Gardon { 177a6a0b05dSBen Gardon bool pfn_changed; 178a6a0b05dSBen Gardon struct kvm_memory_slot *slot; 179a6a0b05dSBen Gardon 180a6a0b05dSBen Gardon if (level > PG_LEVEL_4K) 181a6a0b05dSBen Gardon return; 182a6a0b05dSBen Gardon 183a6a0b05dSBen Gardon pfn_changed = spte_to_pfn(old_spte) != spte_to_pfn(new_spte); 184a6a0b05dSBen Gardon 185a6a0b05dSBen Gardon if ((!is_writable_pte(old_spte) || pfn_changed) && 186a6a0b05dSBen Gardon is_writable_pte(new_spte)) { 187a6a0b05dSBen Gardon slot = __gfn_to_memslot(__kvm_memslots(kvm, as_id), gfn); 188a6a0b05dSBen Gardon mark_page_dirty_in_slot(slot, gfn); 189a6a0b05dSBen Gardon } 190a6a0b05dSBen Gardon } 191a6a0b05dSBen Gardon 1922f2fad08SBen Gardon /** 1932f2fad08SBen Gardon * handle_changed_spte - handle bookkeeping associated with an SPTE change 1942f2fad08SBen Gardon * @kvm: kvm instance 1952f2fad08SBen Gardon * @as_id: the address space of the paging structure the SPTE was a part of 1962f2fad08SBen Gardon * @gfn: the base GFN that was mapped by the SPTE 1972f2fad08SBen Gardon * @old_spte: The value of the SPTE before the change 1982f2fad08SBen Gardon * @new_spte: The value of the SPTE after the change 1992f2fad08SBen Gardon * @level: the level of the PT the SPTE is part of in the paging structure 2002f2fad08SBen Gardon * 2012f2fad08SBen Gardon * Handle bookkeeping that might result from the modification of a SPTE. 2022f2fad08SBen Gardon * This function must be called for all TDP SPTE modifications. 2032f2fad08SBen Gardon */ 2042f2fad08SBen Gardon static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, 2052f2fad08SBen Gardon u64 old_spte, u64 new_spte, int level) 2062f2fad08SBen Gardon { 2072f2fad08SBen Gardon bool was_present = is_shadow_present_pte(old_spte); 2082f2fad08SBen Gardon bool is_present = is_shadow_present_pte(new_spte); 2092f2fad08SBen Gardon bool was_leaf = was_present && is_last_spte(old_spte, level); 2102f2fad08SBen Gardon bool is_leaf = is_present && is_last_spte(new_spte, level); 2112f2fad08SBen Gardon bool pfn_changed = spte_to_pfn(old_spte) != spte_to_pfn(new_spte); 2122f2fad08SBen Gardon u64 *pt; 21389c0fd49SBen Gardon struct kvm_mmu_page *sp; 2142f2fad08SBen Gardon u64 old_child_spte; 2152f2fad08SBen Gardon int i; 2162f2fad08SBen Gardon 2172f2fad08SBen Gardon WARN_ON(level > PT64_ROOT_MAX_LEVEL); 2182f2fad08SBen Gardon WARN_ON(level < PG_LEVEL_4K); 219764388ceSSean Christopherson WARN_ON(gfn & (KVM_PAGES_PER_HPAGE(level) - 1)); 2202f2fad08SBen Gardon 2212f2fad08SBen Gardon /* 2222f2fad08SBen Gardon * If this warning were to trigger it would indicate that there was a 2232f2fad08SBen Gardon * missing MMU notifier or a race with some notifier handler. 2242f2fad08SBen Gardon * A present, leaf SPTE should never be directly replaced with another 2252f2fad08SBen Gardon * present leaf SPTE pointing to a differnt PFN. A notifier handler 2262f2fad08SBen Gardon * should be zapping the SPTE before the main MM's page table is 2272f2fad08SBen Gardon * changed, or the SPTE should be zeroed, and the TLBs flushed by the 2282f2fad08SBen Gardon * thread before replacement. 2292f2fad08SBen Gardon */ 2302f2fad08SBen Gardon if (was_leaf && is_leaf && pfn_changed) { 2312f2fad08SBen Gardon pr_err("Invalid SPTE change: cannot replace a present leaf\n" 2322f2fad08SBen Gardon "SPTE with another present leaf SPTE mapping a\n" 2332f2fad08SBen Gardon "different PFN!\n" 2342f2fad08SBen Gardon "as_id: %d gfn: %llx old_spte: %llx new_spte: %llx level: %d", 2352f2fad08SBen Gardon as_id, gfn, old_spte, new_spte, level); 2362f2fad08SBen Gardon 2372f2fad08SBen Gardon /* 2382f2fad08SBen Gardon * Crash the host to prevent error propagation and guest data 2392f2fad08SBen Gardon * courruption. 2402f2fad08SBen Gardon */ 2412f2fad08SBen Gardon BUG(); 2422f2fad08SBen Gardon } 2432f2fad08SBen Gardon 2442f2fad08SBen Gardon if (old_spte == new_spte) 2452f2fad08SBen Gardon return; 2462f2fad08SBen Gardon 2472f2fad08SBen Gardon /* 2482f2fad08SBen Gardon * The only times a SPTE should be changed from a non-present to 2492f2fad08SBen Gardon * non-present state is when an MMIO entry is installed/modified/ 2502f2fad08SBen Gardon * removed. In that case, there is nothing to do here. 2512f2fad08SBen Gardon */ 2522f2fad08SBen Gardon if (!was_present && !is_present) { 2532f2fad08SBen Gardon /* 2542f2fad08SBen Gardon * If this change does not involve a MMIO SPTE, it is 2552f2fad08SBen Gardon * unexpected. Log the change, though it should not impact the 2562f2fad08SBen Gardon * guest since both the former and current SPTEs are nonpresent. 2572f2fad08SBen Gardon */ 2582f2fad08SBen Gardon if (WARN_ON(!is_mmio_spte(old_spte) && !is_mmio_spte(new_spte))) 2592f2fad08SBen Gardon pr_err("Unexpected SPTE change! Nonpresent SPTEs\n" 2602f2fad08SBen Gardon "should not be replaced with another,\n" 2612f2fad08SBen Gardon "different nonpresent SPTE, unless one or both\n" 2622f2fad08SBen Gardon "are MMIO SPTEs.\n" 2632f2fad08SBen Gardon "as_id: %d gfn: %llx old_spte: %llx new_spte: %llx level: %d", 2642f2fad08SBen Gardon as_id, gfn, old_spte, new_spte, level); 2652f2fad08SBen Gardon return; 2662f2fad08SBen Gardon } 2672f2fad08SBen Gardon 2682f2fad08SBen Gardon 2692f2fad08SBen Gardon if (was_leaf && is_dirty_spte(old_spte) && 2702f2fad08SBen Gardon (!is_dirty_spte(new_spte) || pfn_changed)) 2712f2fad08SBen Gardon kvm_set_pfn_dirty(spte_to_pfn(old_spte)); 2722f2fad08SBen Gardon 2732f2fad08SBen Gardon /* 2742f2fad08SBen Gardon * Recursively handle child PTs if the change removed a subtree from 2752f2fad08SBen Gardon * the paging structure. 2762f2fad08SBen Gardon */ 2772f2fad08SBen Gardon if (was_present && !was_leaf && (pfn_changed || !is_present)) { 2782f2fad08SBen Gardon pt = spte_to_child_pt(old_spte, level); 27989c0fd49SBen Gardon sp = sptep_to_sp(pt); 28089c0fd49SBen Gardon 28189c0fd49SBen Gardon list_del(&sp->link); 2822f2fad08SBen Gardon 28329cf0f50SBen Gardon if (sp->lpage_disallowed) 28429cf0f50SBen Gardon unaccount_huge_nx_page(kvm, sp); 28529cf0f50SBen Gardon 2862f2fad08SBen Gardon for (i = 0; i < PT64_ENT_PER_PAGE; i++) { 2872f2fad08SBen Gardon old_child_spte = READ_ONCE(*(pt + i)); 2882f2fad08SBen Gardon WRITE_ONCE(*(pt + i), 0); 2892f2fad08SBen Gardon handle_changed_spte(kvm, as_id, 2902f2fad08SBen Gardon gfn + (i * KVM_PAGES_PER_HPAGE(level - 1)), 2912f2fad08SBen Gardon old_child_spte, 0, level - 1); 2922f2fad08SBen Gardon } 2932f2fad08SBen Gardon 2942f2fad08SBen Gardon kvm_flush_remote_tlbs_with_address(kvm, gfn, 2952f2fad08SBen Gardon KVM_PAGES_PER_HPAGE(level)); 2962f2fad08SBen Gardon 2972f2fad08SBen Gardon free_page((unsigned long)pt); 29889c0fd49SBen Gardon kmem_cache_free(mmu_page_header_cache, sp); 2992f2fad08SBen Gardon } 3002f2fad08SBen Gardon } 3012f2fad08SBen Gardon 3022f2fad08SBen Gardon static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, 3032f2fad08SBen Gardon u64 old_spte, u64 new_spte, int level) 3042f2fad08SBen Gardon { 3052f2fad08SBen Gardon __handle_changed_spte(kvm, as_id, gfn, old_spte, new_spte, level); 306f8e14497SBen Gardon handle_changed_spte_acc_track(old_spte, new_spte, level); 307a6a0b05dSBen Gardon handle_changed_spte_dirty_log(kvm, as_id, gfn, old_spte, 308a6a0b05dSBen Gardon new_spte, level); 3092f2fad08SBen Gardon } 310faaf05b0SBen Gardon 311f8e14497SBen Gardon static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter, 312a6a0b05dSBen Gardon u64 new_spte, bool record_acc_track, 313a6a0b05dSBen Gardon bool record_dirty_log) 314faaf05b0SBen Gardon { 315faaf05b0SBen Gardon u64 *root_pt = tdp_iter_root_pt(iter); 316faaf05b0SBen Gardon struct kvm_mmu_page *root = sptep_to_sp(root_pt); 317faaf05b0SBen Gardon int as_id = kvm_mmu_page_as_id(root); 318faaf05b0SBen Gardon 319f8e14497SBen Gardon WRITE_ONCE(*iter->sptep, new_spte); 320faaf05b0SBen Gardon 321f8e14497SBen Gardon __handle_changed_spte(kvm, as_id, iter->gfn, iter->old_spte, new_spte, 322faaf05b0SBen Gardon iter->level); 323f8e14497SBen Gardon if (record_acc_track) 324f8e14497SBen Gardon handle_changed_spte_acc_track(iter->old_spte, new_spte, 325f8e14497SBen Gardon iter->level); 326a6a0b05dSBen Gardon if (record_dirty_log) 327a6a0b05dSBen Gardon handle_changed_spte_dirty_log(kvm, as_id, iter->gfn, 328a6a0b05dSBen Gardon iter->old_spte, new_spte, 329a6a0b05dSBen Gardon iter->level); 330f8e14497SBen Gardon } 331f8e14497SBen Gardon 332f8e14497SBen Gardon static inline void tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter, 333f8e14497SBen Gardon u64 new_spte) 334f8e14497SBen Gardon { 335a6a0b05dSBen Gardon __tdp_mmu_set_spte(kvm, iter, new_spte, true, true); 336f8e14497SBen Gardon } 337f8e14497SBen Gardon 338f8e14497SBen Gardon static inline void tdp_mmu_set_spte_no_acc_track(struct kvm *kvm, 339f8e14497SBen Gardon struct tdp_iter *iter, 340f8e14497SBen Gardon u64 new_spte) 341f8e14497SBen Gardon { 342a6a0b05dSBen Gardon __tdp_mmu_set_spte(kvm, iter, new_spte, false, true); 343a6a0b05dSBen Gardon } 344a6a0b05dSBen Gardon 345a6a0b05dSBen Gardon static inline void tdp_mmu_set_spte_no_dirty_log(struct kvm *kvm, 346a6a0b05dSBen Gardon struct tdp_iter *iter, 347a6a0b05dSBen Gardon u64 new_spte) 348a6a0b05dSBen Gardon { 349a6a0b05dSBen Gardon __tdp_mmu_set_spte(kvm, iter, new_spte, true, false); 350faaf05b0SBen Gardon } 351faaf05b0SBen Gardon 352faaf05b0SBen Gardon #define tdp_root_for_each_pte(_iter, _root, _start, _end) \ 353faaf05b0SBen Gardon for_each_tdp_pte(_iter, _root->spt, _root->role.level, _start, _end) 354faaf05b0SBen Gardon 355f8e14497SBen Gardon #define tdp_root_for_each_leaf_pte(_iter, _root, _start, _end) \ 356f8e14497SBen Gardon tdp_root_for_each_pte(_iter, _root, _start, _end) \ 357f8e14497SBen Gardon if (!is_shadow_present_pte(_iter.old_spte) || \ 358f8e14497SBen Gardon !is_last_spte(_iter.old_spte, _iter.level)) \ 359f8e14497SBen Gardon continue; \ 360f8e14497SBen Gardon else 361f8e14497SBen Gardon 362bb18842eSBen Gardon #define tdp_mmu_for_each_pte(_iter, _mmu, _start, _end) \ 363bb18842eSBen Gardon for_each_tdp_pte(_iter, __va(_mmu->root_hpa), \ 364bb18842eSBen Gardon _mmu->shadow_root_level, _start, _end) 365bb18842eSBen Gardon 366faaf05b0SBen Gardon /* 367faaf05b0SBen Gardon * Flush the TLB if the process should drop kvm->mmu_lock. 368faaf05b0SBen Gardon * Return whether the caller still needs to flush the tlb. 369faaf05b0SBen Gardon */ 370faaf05b0SBen Gardon static bool tdp_mmu_iter_flush_cond_resched(struct kvm *kvm, struct tdp_iter *iter) 371faaf05b0SBen Gardon { 372faaf05b0SBen Gardon if (need_resched() || spin_needbreak(&kvm->mmu_lock)) { 373faaf05b0SBen Gardon kvm_flush_remote_tlbs(kvm); 374faaf05b0SBen Gardon cond_resched_lock(&kvm->mmu_lock); 375faaf05b0SBen Gardon tdp_iter_refresh_walk(iter); 376faaf05b0SBen Gardon return false; 377faaf05b0SBen Gardon } else { 378faaf05b0SBen Gardon return true; 379faaf05b0SBen Gardon } 380faaf05b0SBen Gardon } 381faaf05b0SBen Gardon 382a6a0b05dSBen Gardon static void tdp_mmu_iter_cond_resched(struct kvm *kvm, struct tdp_iter *iter) 383a6a0b05dSBen Gardon { 384a6a0b05dSBen Gardon if (need_resched() || spin_needbreak(&kvm->mmu_lock)) { 385a6a0b05dSBen Gardon cond_resched_lock(&kvm->mmu_lock); 386a6a0b05dSBen Gardon tdp_iter_refresh_walk(iter); 387a6a0b05dSBen Gardon } 388a6a0b05dSBen Gardon } 389a6a0b05dSBen Gardon 390faaf05b0SBen Gardon /* 391faaf05b0SBen Gardon * Tears down the mappings for the range of gfns, [start, end), and frees the 392faaf05b0SBen Gardon * non-root pages mapping GFNs strictly within that range. Returns true if 393faaf05b0SBen Gardon * SPTEs have been cleared and a TLB flush is needed before releasing the 394faaf05b0SBen Gardon * MMU lock. 395063afacdSBen Gardon * If can_yield is true, will release the MMU lock and reschedule if the 396063afacdSBen Gardon * scheduler needs the CPU or there is contention on the MMU lock. If this 397063afacdSBen Gardon * function cannot yield, it will not release the MMU lock or reschedule and 398063afacdSBen Gardon * the caller must ensure it does not supply too large a GFN range, or the 399063afacdSBen Gardon * operation can cause a soft lockup. 400faaf05b0SBen Gardon */ 401faaf05b0SBen Gardon static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 402063afacdSBen Gardon gfn_t start, gfn_t end, bool can_yield) 403faaf05b0SBen Gardon { 404faaf05b0SBen Gardon struct tdp_iter iter; 405faaf05b0SBen Gardon bool flush_needed = false; 406faaf05b0SBen Gardon 407faaf05b0SBen Gardon tdp_root_for_each_pte(iter, root, start, end) { 408faaf05b0SBen Gardon if (!is_shadow_present_pte(iter.old_spte)) 409faaf05b0SBen Gardon continue; 410faaf05b0SBen Gardon 411faaf05b0SBen Gardon /* 412faaf05b0SBen Gardon * If this is a non-last-level SPTE that covers a larger range 413faaf05b0SBen Gardon * than should be zapped, continue, and zap the mappings at a 414faaf05b0SBen Gardon * lower level. 415faaf05b0SBen Gardon */ 416faaf05b0SBen Gardon if ((iter.gfn < start || 417faaf05b0SBen Gardon iter.gfn + KVM_PAGES_PER_HPAGE(iter.level) > end) && 418faaf05b0SBen Gardon !is_last_spte(iter.old_spte, iter.level)) 419faaf05b0SBen Gardon continue; 420faaf05b0SBen Gardon 421faaf05b0SBen Gardon tdp_mmu_set_spte(kvm, &iter, 0); 422faaf05b0SBen Gardon 423063afacdSBen Gardon if (can_yield) 424faaf05b0SBen Gardon flush_needed = tdp_mmu_iter_flush_cond_resched(kvm, &iter); 425063afacdSBen Gardon else 426063afacdSBen Gardon flush_needed = true; 427faaf05b0SBen Gardon } 428faaf05b0SBen Gardon return flush_needed; 429faaf05b0SBen Gardon } 430faaf05b0SBen Gardon 431faaf05b0SBen Gardon /* 432faaf05b0SBen Gardon * Tears down the mappings for the range of gfns, [start, end), and frees the 433faaf05b0SBen Gardon * non-root pages mapping GFNs strictly within that range. Returns true if 434faaf05b0SBen Gardon * SPTEs have been cleared and a TLB flush is needed before releasing the 435faaf05b0SBen Gardon * MMU lock. 436faaf05b0SBen Gardon */ 437faaf05b0SBen Gardon bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end) 438faaf05b0SBen Gardon { 439faaf05b0SBen Gardon struct kvm_mmu_page *root; 440faaf05b0SBen Gardon bool flush = false; 441faaf05b0SBen Gardon 442faaf05b0SBen Gardon for_each_tdp_mmu_root(kvm, root) { 443faaf05b0SBen Gardon /* 444faaf05b0SBen Gardon * Take a reference on the root so that it cannot be freed if 445faaf05b0SBen Gardon * this thread releases the MMU lock and yields in this loop. 446faaf05b0SBen Gardon */ 447faaf05b0SBen Gardon kvm_mmu_get_root(kvm, root); 448faaf05b0SBen Gardon 449063afacdSBen Gardon flush |= zap_gfn_range(kvm, root, start, end, true); 450faaf05b0SBen Gardon 451faaf05b0SBen Gardon kvm_mmu_put_root(kvm, root); 452faaf05b0SBen Gardon } 453faaf05b0SBen Gardon 454faaf05b0SBen Gardon return flush; 455faaf05b0SBen Gardon } 456faaf05b0SBen Gardon 457faaf05b0SBen Gardon void kvm_tdp_mmu_zap_all(struct kvm *kvm) 458faaf05b0SBen Gardon { 459339f5a7fSRick Edgecombe gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT); 460faaf05b0SBen Gardon bool flush; 461faaf05b0SBen Gardon 462faaf05b0SBen Gardon flush = kvm_tdp_mmu_zap_gfn_range(kvm, 0, max_gfn); 463faaf05b0SBen Gardon if (flush) 464faaf05b0SBen Gardon kvm_flush_remote_tlbs(kvm); 465faaf05b0SBen Gardon } 466bb18842eSBen Gardon 467bb18842eSBen Gardon /* 468bb18842eSBen Gardon * Installs a last-level SPTE to handle a TDP page fault. 469bb18842eSBen Gardon * (NPT/EPT violation/misconfiguration) 470bb18842eSBen Gardon */ 471bb18842eSBen Gardon static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, int write, 472bb18842eSBen Gardon int map_writable, 473bb18842eSBen Gardon struct tdp_iter *iter, 474bb18842eSBen Gardon kvm_pfn_t pfn, bool prefault) 475bb18842eSBen Gardon { 476bb18842eSBen Gardon u64 new_spte; 477bb18842eSBen Gardon int ret = 0; 478bb18842eSBen Gardon int make_spte_ret = 0; 479bb18842eSBen Gardon 480bb18842eSBen Gardon if (unlikely(is_noslot_pfn(pfn))) { 481bb18842eSBen Gardon new_spte = make_mmio_spte(vcpu, iter->gfn, ACC_ALL); 482bb18842eSBen Gardon trace_mark_mmio_spte(iter->sptep, iter->gfn, new_spte); 483bb18842eSBen Gardon } else 484bb18842eSBen Gardon make_spte_ret = make_spte(vcpu, ACC_ALL, iter->level, iter->gfn, 485bb18842eSBen Gardon pfn, iter->old_spte, prefault, true, 486bb18842eSBen Gardon map_writable, !shadow_accessed_mask, 487bb18842eSBen Gardon &new_spte); 488bb18842eSBen Gardon 489bb18842eSBen Gardon if (new_spte == iter->old_spte) 490bb18842eSBen Gardon ret = RET_PF_SPURIOUS; 491bb18842eSBen Gardon else 492bb18842eSBen Gardon tdp_mmu_set_spte(vcpu->kvm, iter, new_spte); 493bb18842eSBen Gardon 494bb18842eSBen Gardon /* 495bb18842eSBen Gardon * If the page fault was caused by a write but the page is write 496bb18842eSBen Gardon * protected, emulation is needed. If the emulation was skipped, 497bb18842eSBen Gardon * the vCPU would have the same fault again. 498bb18842eSBen Gardon */ 499bb18842eSBen Gardon if (make_spte_ret & SET_SPTE_WRITE_PROTECTED_PT) { 500bb18842eSBen Gardon if (write) 501bb18842eSBen Gardon ret = RET_PF_EMULATE; 502bb18842eSBen Gardon kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu); 503bb18842eSBen Gardon } 504bb18842eSBen Gardon 505bb18842eSBen Gardon /* If a MMIO SPTE is installed, the MMIO will need to be emulated. */ 506bb18842eSBen Gardon if (unlikely(is_mmio_spte(new_spte))) 507bb18842eSBen Gardon ret = RET_PF_EMULATE; 508bb18842eSBen Gardon 509bb18842eSBen Gardon trace_kvm_mmu_set_spte(iter->level, iter->gfn, iter->sptep); 510bb18842eSBen Gardon if (!prefault) 511bb18842eSBen Gardon vcpu->stat.pf_fixed++; 512bb18842eSBen Gardon 513bb18842eSBen Gardon return ret; 514bb18842eSBen Gardon } 515bb18842eSBen Gardon 516bb18842eSBen Gardon /* 517bb18842eSBen Gardon * Handle a TDP page fault (NPT/EPT violation/misconfiguration) by installing 518bb18842eSBen Gardon * page tables and SPTEs to translate the faulting guest physical address. 519bb18842eSBen Gardon */ 520bb18842eSBen Gardon int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, 521bb18842eSBen Gardon int map_writable, int max_level, kvm_pfn_t pfn, 522bb18842eSBen Gardon bool prefault) 523bb18842eSBen Gardon { 524bb18842eSBen Gardon bool nx_huge_page_workaround_enabled = is_nx_huge_page_enabled(); 525bb18842eSBen Gardon bool write = error_code & PFERR_WRITE_MASK; 526bb18842eSBen Gardon bool exec = error_code & PFERR_FETCH_MASK; 527bb18842eSBen Gardon bool huge_page_disallowed = exec && nx_huge_page_workaround_enabled; 528bb18842eSBen Gardon struct kvm_mmu *mmu = vcpu->arch.mmu; 529bb18842eSBen Gardon struct tdp_iter iter; 53089c0fd49SBen Gardon struct kvm_mmu_page *sp; 531bb18842eSBen Gardon u64 *child_pt; 532bb18842eSBen Gardon u64 new_spte; 533bb18842eSBen Gardon int ret; 534bb18842eSBen Gardon gfn_t gfn = gpa >> PAGE_SHIFT; 535bb18842eSBen Gardon int level; 536bb18842eSBen Gardon int req_level; 537bb18842eSBen Gardon 538bb18842eSBen Gardon if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa))) 539bb18842eSBen Gardon return RET_PF_RETRY; 540bb18842eSBen Gardon if (WARN_ON(!is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa))) 541bb18842eSBen Gardon return RET_PF_RETRY; 542bb18842eSBen Gardon 543bb18842eSBen Gardon level = kvm_mmu_hugepage_adjust(vcpu, gfn, max_level, &pfn, 544bb18842eSBen Gardon huge_page_disallowed, &req_level); 545bb18842eSBen Gardon 546bb18842eSBen Gardon trace_kvm_mmu_spte_requested(gpa, level, pfn); 547bb18842eSBen Gardon tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) { 548bb18842eSBen Gardon if (nx_huge_page_workaround_enabled) 549bb18842eSBen Gardon disallowed_hugepage_adjust(iter.old_spte, gfn, 550bb18842eSBen Gardon iter.level, &pfn, &level); 551bb18842eSBen Gardon 552bb18842eSBen Gardon if (iter.level == level) 553bb18842eSBen Gardon break; 554bb18842eSBen Gardon 555bb18842eSBen Gardon /* 556bb18842eSBen Gardon * If there is an SPTE mapping a large page at a higher level 557bb18842eSBen Gardon * than the target, that SPTE must be cleared and replaced 558bb18842eSBen Gardon * with a non-leaf SPTE. 559bb18842eSBen Gardon */ 560bb18842eSBen Gardon if (is_shadow_present_pte(iter.old_spte) && 561bb18842eSBen Gardon is_large_pte(iter.old_spte)) { 562bb18842eSBen Gardon tdp_mmu_set_spte(vcpu->kvm, &iter, 0); 563bb18842eSBen Gardon 564bb18842eSBen Gardon kvm_flush_remote_tlbs_with_address(vcpu->kvm, iter.gfn, 565bb18842eSBen Gardon KVM_PAGES_PER_HPAGE(iter.level)); 566bb18842eSBen Gardon 567bb18842eSBen Gardon /* 568bb18842eSBen Gardon * The iter must explicitly re-read the spte here 569bb18842eSBen Gardon * because the new value informs the !present 570bb18842eSBen Gardon * path below. 571bb18842eSBen Gardon */ 572bb18842eSBen Gardon iter.old_spte = READ_ONCE(*iter.sptep); 573bb18842eSBen Gardon } 574bb18842eSBen Gardon 575bb18842eSBen Gardon if (!is_shadow_present_pte(iter.old_spte)) { 57689c0fd49SBen Gardon sp = alloc_tdp_mmu_page(vcpu, iter.gfn, iter.level); 57789c0fd49SBen Gardon list_add(&sp->link, &vcpu->kvm->arch.tdp_mmu_pages); 57889c0fd49SBen Gardon child_pt = sp->spt; 579bb18842eSBen Gardon clear_page(child_pt); 580bb18842eSBen Gardon new_spte = make_nonleaf_spte(child_pt, 581bb18842eSBen Gardon !shadow_accessed_mask); 582bb18842eSBen Gardon 583bb18842eSBen Gardon trace_kvm_mmu_get_page(sp, true); 58429cf0f50SBen Gardon if (huge_page_disallowed && req_level >= iter.level) 58529cf0f50SBen Gardon account_huge_nx_page(vcpu->kvm, sp); 58629cf0f50SBen Gardon 587bb18842eSBen Gardon tdp_mmu_set_spte(vcpu->kvm, &iter, new_spte); 588bb18842eSBen Gardon } 589bb18842eSBen Gardon } 590bb18842eSBen Gardon 591bb18842eSBen Gardon if (WARN_ON(iter.level != level)) 592bb18842eSBen Gardon return RET_PF_RETRY; 593bb18842eSBen Gardon 594bb18842eSBen Gardon ret = tdp_mmu_map_handle_target_level(vcpu, write, map_writable, &iter, 595bb18842eSBen Gardon pfn, prefault); 596bb18842eSBen Gardon 597bb18842eSBen Gardon return ret; 598bb18842eSBen Gardon } 599063afacdSBen Gardon 600063afacdSBen Gardon static int kvm_tdp_mmu_handle_hva_range(struct kvm *kvm, unsigned long start, 601063afacdSBen Gardon unsigned long end, unsigned long data, 602063afacdSBen Gardon int (*handler)(struct kvm *kvm, struct kvm_memory_slot *slot, 603063afacdSBen Gardon struct kvm_mmu_page *root, gfn_t start, 604063afacdSBen Gardon gfn_t end, unsigned long data)) 605063afacdSBen Gardon { 606063afacdSBen Gardon struct kvm_memslots *slots; 607063afacdSBen Gardon struct kvm_memory_slot *memslot; 608063afacdSBen Gardon struct kvm_mmu_page *root; 609063afacdSBen Gardon int ret = 0; 610063afacdSBen Gardon int as_id; 611063afacdSBen Gardon 612063afacdSBen Gardon for_each_tdp_mmu_root(kvm, root) { 613063afacdSBen Gardon /* 614063afacdSBen Gardon * Take a reference on the root so that it cannot be freed if 615063afacdSBen Gardon * this thread releases the MMU lock and yields in this loop. 616063afacdSBen Gardon */ 617063afacdSBen Gardon kvm_mmu_get_root(kvm, root); 618063afacdSBen Gardon 619063afacdSBen Gardon as_id = kvm_mmu_page_as_id(root); 620063afacdSBen Gardon slots = __kvm_memslots(kvm, as_id); 621063afacdSBen Gardon kvm_for_each_memslot(memslot, slots) { 622063afacdSBen Gardon unsigned long hva_start, hva_end; 623063afacdSBen Gardon gfn_t gfn_start, gfn_end; 624063afacdSBen Gardon 625063afacdSBen Gardon hva_start = max(start, memslot->userspace_addr); 626063afacdSBen Gardon hva_end = min(end, memslot->userspace_addr + 627063afacdSBen Gardon (memslot->npages << PAGE_SHIFT)); 628063afacdSBen Gardon if (hva_start >= hva_end) 629063afacdSBen Gardon continue; 630063afacdSBen Gardon /* 631063afacdSBen Gardon * {gfn(page) | page intersects with [hva_start, hva_end)} = 632063afacdSBen Gardon * {gfn_start, gfn_start+1, ..., gfn_end-1}. 633063afacdSBen Gardon */ 634063afacdSBen Gardon gfn_start = hva_to_gfn_memslot(hva_start, memslot); 635063afacdSBen Gardon gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); 636063afacdSBen Gardon 637063afacdSBen Gardon ret |= handler(kvm, memslot, root, gfn_start, 638063afacdSBen Gardon gfn_end, data); 639063afacdSBen Gardon } 640063afacdSBen Gardon 641063afacdSBen Gardon kvm_mmu_put_root(kvm, root); 642063afacdSBen Gardon } 643063afacdSBen Gardon 644063afacdSBen Gardon return ret; 645063afacdSBen Gardon } 646063afacdSBen Gardon 647063afacdSBen Gardon static int zap_gfn_range_hva_wrapper(struct kvm *kvm, 648063afacdSBen Gardon struct kvm_memory_slot *slot, 649063afacdSBen Gardon struct kvm_mmu_page *root, gfn_t start, 650063afacdSBen Gardon gfn_t end, unsigned long unused) 651063afacdSBen Gardon { 652063afacdSBen Gardon return zap_gfn_range(kvm, root, start, end, false); 653063afacdSBen Gardon } 654063afacdSBen Gardon 655063afacdSBen Gardon int kvm_tdp_mmu_zap_hva_range(struct kvm *kvm, unsigned long start, 656063afacdSBen Gardon unsigned long end) 657063afacdSBen Gardon { 658063afacdSBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, start, end, 0, 659063afacdSBen Gardon zap_gfn_range_hva_wrapper); 660063afacdSBen Gardon } 661f8e14497SBen Gardon 662f8e14497SBen Gardon /* 663f8e14497SBen Gardon * Mark the SPTEs range of GFNs [start, end) unaccessed and return non-zero 664f8e14497SBen Gardon * if any of the GFNs in the range have been accessed. 665f8e14497SBen Gardon */ 666f8e14497SBen Gardon static int age_gfn_range(struct kvm *kvm, struct kvm_memory_slot *slot, 667f8e14497SBen Gardon struct kvm_mmu_page *root, gfn_t start, gfn_t end, 668f8e14497SBen Gardon unsigned long unused) 669f8e14497SBen Gardon { 670f8e14497SBen Gardon struct tdp_iter iter; 671f8e14497SBen Gardon int young = 0; 672f8e14497SBen Gardon u64 new_spte = 0; 673f8e14497SBen Gardon 674f8e14497SBen Gardon tdp_root_for_each_leaf_pte(iter, root, start, end) { 675f8e14497SBen Gardon /* 676f8e14497SBen Gardon * If we have a non-accessed entry we don't need to change the 677f8e14497SBen Gardon * pte. 678f8e14497SBen Gardon */ 679f8e14497SBen Gardon if (!is_accessed_spte(iter.old_spte)) 680f8e14497SBen Gardon continue; 681f8e14497SBen Gardon 682f8e14497SBen Gardon new_spte = iter.old_spte; 683f8e14497SBen Gardon 684f8e14497SBen Gardon if (spte_ad_enabled(new_spte)) { 685f8e14497SBen Gardon clear_bit((ffs(shadow_accessed_mask) - 1), 686f8e14497SBen Gardon (unsigned long *)&new_spte); 687f8e14497SBen Gardon } else { 688f8e14497SBen Gardon /* 689f8e14497SBen Gardon * Capture the dirty status of the page, so that it doesn't get 690f8e14497SBen Gardon * lost when the SPTE is marked for access tracking. 691f8e14497SBen Gardon */ 692f8e14497SBen Gardon if (is_writable_pte(new_spte)) 693f8e14497SBen Gardon kvm_set_pfn_dirty(spte_to_pfn(new_spte)); 694f8e14497SBen Gardon 695f8e14497SBen Gardon new_spte = mark_spte_for_access_track(new_spte); 696f8e14497SBen Gardon } 697a6a0b05dSBen Gardon new_spte &= ~shadow_dirty_mask; 698f8e14497SBen Gardon 699f8e14497SBen Gardon tdp_mmu_set_spte_no_acc_track(kvm, &iter, new_spte); 700f8e14497SBen Gardon young = 1; 701f8e14497SBen Gardon } 702f8e14497SBen Gardon 703f8e14497SBen Gardon return young; 704f8e14497SBen Gardon } 705f8e14497SBen Gardon 706f8e14497SBen Gardon int kvm_tdp_mmu_age_hva_range(struct kvm *kvm, unsigned long start, 707f8e14497SBen Gardon unsigned long end) 708f8e14497SBen Gardon { 709f8e14497SBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, start, end, 0, 710f8e14497SBen Gardon age_gfn_range); 711f8e14497SBen Gardon } 712f8e14497SBen Gardon 713f8e14497SBen Gardon static int test_age_gfn(struct kvm *kvm, struct kvm_memory_slot *slot, 714f8e14497SBen Gardon struct kvm_mmu_page *root, gfn_t gfn, gfn_t unused, 715f8e14497SBen Gardon unsigned long unused2) 716f8e14497SBen Gardon { 717f8e14497SBen Gardon struct tdp_iter iter; 718f8e14497SBen Gardon 719f8e14497SBen Gardon tdp_root_for_each_leaf_pte(iter, root, gfn, gfn + 1) 720f8e14497SBen Gardon if (is_accessed_spte(iter.old_spte)) 721f8e14497SBen Gardon return 1; 722f8e14497SBen Gardon 723f8e14497SBen Gardon return 0; 724f8e14497SBen Gardon } 725f8e14497SBen Gardon 726f8e14497SBen Gardon int kvm_tdp_mmu_test_age_hva(struct kvm *kvm, unsigned long hva) 727f8e14497SBen Gardon { 728f8e14497SBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, hva, hva + 1, 0, 729f8e14497SBen Gardon test_age_gfn); 730f8e14497SBen Gardon } 7311d8dd6b3SBen Gardon 7321d8dd6b3SBen Gardon /* 7331d8dd6b3SBen Gardon * Handle the changed_pte MMU notifier for the TDP MMU. 7341d8dd6b3SBen Gardon * data is a pointer to the new pte_t mapping the HVA specified by the MMU 7351d8dd6b3SBen Gardon * notifier. 7361d8dd6b3SBen Gardon * Returns non-zero if a flush is needed before releasing the MMU lock. 7371d8dd6b3SBen Gardon */ 7381d8dd6b3SBen Gardon static int set_tdp_spte(struct kvm *kvm, struct kvm_memory_slot *slot, 7391d8dd6b3SBen Gardon struct kvm_mmu_page *root, gfn_t gfn, gfn_t unused, 7401d8dd6b3SBen Gardon unsigned long data) 7411d8dd6b3SBen Gardon { 7421d8dd6b3SBen Gardon struct tdp_iter iter; 7431d8dd6b3SBen Gardon pte_t *ptep = (pte_t *)data; 7441d8dd6b3SBen Gardon kvm_pfn_t new_pfn; 7451d8dd6b3SBen Gardon u64 new_spte; 7461d8dd6b3SBen Gardon int need_flush = 0; 7471d8dd6b3SBen Gardon 7481d8dd6b3SBen Gardon WARN_ON(pte_huge(*ptep)); 7491d8dd6b3SBen Gardon 7501d8dd6b3SBen Gardon new_pfn = pte_pfn(*ptep); 7511d8dd6b3SBen Gardon 7521d8dd6b3SBen Gardon tdp_root_for_each_pte(iter, root, gfn, gfn + 1) { 7531d8dd6b3SBen Gardon if (iter.level != PG_LEVEL_4K) 7541d8dd6b3SBen Gardon continue; 7551d8dd6b3SBen Gardon 7561d8dd6b3SBen Gardon if (!is_shadow_present_pte(iter.old_spte)) 7571d8dd6b3SBen Gardon break; 7581d8dd6b3SBen Gardon 7591d8dd6b3SBen Gardon tdp_mmu_set_spte(kvm, &iter, 0); 7601d8dd6b3SBen Gardon 7611d8dd6b3SBen Gardon kvm_flush_remote_tlbs_with_address(kvm, iter.gfn, 1); 7621d8dd6b3SBen Gardon 7631d8dd6b3SBen Gardon if (!pte_write(*ptep)) { 7641d8dd6b3SBen Gardon new_spte = kvm_mmu_changed_pte_notifier_make_spte( 7651d8dd6b3SBen Gardon iter.old_spte, new_pfn); 7661d8dd6b3SBen Gardon 7671d8dd6b3SBen Gardon tdp_mmu_set_spte(kvm, &iter, new_spte); 7681d8dd6b3SBen Gardon } 7691d8dd6b3SBen Gardon 7701d8dd6b3SBen Gardon need_flush = 1; 7711d8dd6b3SBen Gardon } 7721d8dd6b3SBen Gardon 7731d8dd6b3SBen Gardon if (need_flush) 7741d8dd6b3SBen Gardon kvm_flush_remote_tlbs_with_address(kvm, gfn, 1); 7751d8dd6b3SBen Gardon 7761d8dd6b3SBen Gardon return 0; 7771d8dd6b3SBen Gardon } 7781d8dd6b3SBen Gardon 7791d8dd6b3SBen Gardon int kvm_tdp_mmu_set_spte_hva(struct kvm *kvm, unsigned long address, 7801d8dd6b3SBen Gardon pte_t *host_ptep) 7811d8dd6b3SBen Gardon { 7821d8dd6b3SBen Gardon return kvm_tdp_mmu_handle_hva_range(kvm, address, address + 1, 7831d8dd6b3SBen Gardon (unsigned long)host_ptep, 7841d8dd6b3SBen Gardon set_tdp_spte); 7851d8dd6b3SBen Gardon } 7861d8dd6b3SBen Gardon 787a6a0b05dSBen Gardon /* 788a6a0b05dSBen Gardon * Remove write access from all the SPTEs mapping GFNs [start, end). If 789a6a0b05dSBen Gardon * skip_4k is set, SPTEs that map 4k pages, will not be write-protected. 790a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 791a6a0b05dSBen Gardon */ 792a6a0b05dSBen Gardon static bool wrprot_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 793a6a0b05dSBen Gardon gfn_t start, gfn_t end, int min_level) 794a6a0b05dSBen Gardon { 795a6a0b05dSBen Gardon struct tdp_iter iter; 796a6a0b05dSBen Gardon u64 new_spte; 797a6a0b05dSBen Gardon bool spte_set = false; 798a6a0b05dSBen Gardon 799a6a0b05dSBen Gardon BUG_ON(min_level > KVM_MAX_HUGEPAGE_LEVEL); 800a6a0b05dSBen Gardon 801a6a0b05dSBen Gardon for_each_tdp_pte_min_level(iter, root->spt, root->role.level, 802a6a0b05dSBen Gardon min_level, start, end) { 803a6a0b05dSBen Gardon if (!is_shadow_present_pte(iter.old_spte) || 804a6a0b05dSBen Gardon !is_last_spte(iter.old_spte, iter.level)) 805a6a0b05dSBen Gardon continue; 806a6a0b05dSBen Gardon 807a6a0b05dSBen Gardon new_spte = iter.old_spte & ~PT_WRITABLE_MASK; 808a6a0b05dSBen Gardon 809a6a0b05dSBen Gardon tdp_mmu_set_spte_no_dirty_log(kvm, &iter, new_spte); 810a6a0b05dSBen Gardon spte_set = true; 811a6a0b05dSBen Gardon 812a6a0b05dSBen Gardon tdp_mmu_iter_cond_resched(kvm, &iter); 813a6a0b05dSBen Gardon } 814a6a0b05dSBen Gardon return spte_set; 815a6a0b05dSBen Gardon } 816a6a0b05dSBen Gardon 817a6a0b05dSBen Gardon /* 818a6a0b05dSBen Gardon * Remove write access from all the SPTEs mapping GFNs in the memslot. Will 819a6a0b05dSBen Gardon * only affect leaf SPTEs down to min_level. 820a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 821a6a0b05dSBen Gardon */ 822a6a0b05dSBen Gardon bool kvm_tdp_mmu_wrprot_slot(struct kvm *kvm, struct kvm_memory_slot *slot, 823a6a0b05dSBen Gardon int min_level) 824a6a0b05dSBen Gardon { 825a6a0b05dSBen Gardon struct kvm_mmu_page *root; 826a6a0b05dSBen Gardon int root_as_id; 827a6a0b05dSBen Gardon bool spte_set = false; 828a6a0b05dSBen Gardon 829a6a0b05dSBen Gardon for_each_tdp_mmu_root(kvm, root) { 830a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 831a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 832a6a0b05dSBen Gardon continue; 833a6a0b05dSBen Gardon 834a6a0b05dSBen Gardon /* 835a6a0b05dSBen Gardon * Take a reference on the root so that it cannot be freed if 836a6a0b05dSBen Gardon * this thread releases the MMU lock and yields in this loop. 837a6a0b05dSBen Gardon */ 838a6a0b05dSBen Gardon kvm_mmu_get_root(kvm, root); 839a6a0b05dSBen Gardon 840a6a0b05dSBen Gardon spte_set |= wrprot_gfn_range(kvm, root, slot->base_gfn, 841a6a0b05dSBen Gardon slot->base_gfn + slot->npages, min_level); 842a6a0b05dSBen Gardon 843a6a0b05dSBen Gardon kvm_mmu_put_root(kvm, root); 844a6a0b05dSBen Gardon } 845a6a0b05dSBen Gardon 846a6a0b05dSBen Gardon return spte_set; 847a6a0b05dSBen Gardon } 848a6a0b05dSBen Gardon 849a6a0b05dSBen Gardon /* 850a6a0b05dSBen Gardon * Clear the dirty status of all the SPTEs mapping GFNs in the memslot. If 851a6a0b05dSBen Gardon * AD bits are enabled, this will involve clearing the dirty bit on each SPTE. 852a6a0b05dSBen Gardon * If AD bits are not enabled, this will require clearing the writable bit on 853a6a0b05dSBen Gardon * each SPTE. Returns true if an SPTE has been changed and the TLBs need to 854a6a0b05dSBen Gardon * be flushed. 855a6a0b05dSBen Gardon */ 856a6a0b05dSBen Gardon static bool clear_dirty_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 857a6a0b05dSBen Gardon gfn_t start, gfn_t end) 858a6a0b05dSBen Gardon { 859a6a0b05dSBen Gardon struct tdp_iter iter; 860a6a0b05dSBen Gardon u64 new_spte; 861a6a0b05dSBen Gardon bool spte_set = false; 862a6a0b05dSBen Gardon 863a6a0b05dSBen Gardon tdp_root_for_each_leaf_pte(iter, root, start, end) { 864a6a0b05dSBen Gardon if (spte_ad_need_write_protect(iter.old_spte)) { 865a6a0b05dSBen Gardon if (is_writable_pte(iter.old_spte)) 866a6a0b05dSBen Gardon new_spte = iter.old_spte & ~PT_WRITABLE_MASK; 867a6a0b05dSBen Gardon else 868a6a0b05dSBen Gardon continue; 869a6a0b05dSBen Gardon } else { 870a6a0b05dSBen Gardon if (iter.old_spte & shadow_dirty_mask) 871a6a0b05dSBen Gardon new_spte = iter.old_spte & ~shadow_dirty_mask; 872a6a0b05dSBen Gardon else 873a6a0b05dSBen Gardon continue; 874a6a0b05dSBen Gardon } 875a6a0b05dSBen Gardon 876a6a0b05dSBen Gardon tdp_mmu_set_spte_no_dirty_log(kvm, &iter, new_spte); 877a6a0b05dSBen Gardon spte_set = true; 878a6a0b05dSBen Gardon 879a6a0b05dSBen Gardon tdp_mmu_iter_cond_resched(kvm, &iter); 880a6a0b05dSBen Gardon } 881a6a0b05dSBen Gardon return spte_set; 882a6a0b05dSBen Gardon } 883a6a0b05dSBen Gardon 884a6a0b05dSBen Gardon /* 885a6a0b05dSBen Gardon * Clear the dirty status of all the SPTEs mapping GFNs in the memslot. If 886a6a0b05dSBen Gardon * AD bits are enabled, this will involve clearing the dirty bit on each SPTE. 887a6a0b05dSBen Gardon * If AD bits are not enabled, this will require clearing the writable bit on 888a6a0b05dSBen Gardon * each SPTE. Returns true if an SPTE has been changed and the TLBs need to 889a6a0b05dSBen Gardon * be flushed. 890a6a0b05dSBen Gardon */ 891a6a0b05dSBen Gardon bool kvm_tdp_mmu_clear_dirty_slot(struct kvm *kvm, struct kvm_memory_slot *slot) 892a6a0b05dSBen Gardon { 893a6a0b05dSBen Gardon struct kvm_mmu_page *root; 894a6a0b05dSBen Gardon int root_as_id; 895a6a0b05dSBen Gardon bool spte_set = false; 896a6a0b05dSBen Gardon 897a6a0b05dSBen Gardon for_each_tdp_mmu_root(kvm, root) { 898a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 899a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 900a6a0b05dSBen Gardon continue; 901a6a0b05dSBen Gardon 902a6a0b05dSBen Gardon /* 903a6a0b05dSBen Gardon * Take a reference on the root so that it cannot be freed if 904a6a0b05dSBen Gardon * this thread releases the MMU lock and yields in this loop. 905a6a0b05dSBen Gardon */ 906a6a0b05dSBen Gardon kvm_mmu_get_root(kvm, root); 907a6a0b05dSBen Gardon 908a6a0b05dSBen Gardon spte_set |= clear_dirty_gfn_range(kvm, root, slot->base_gfn, 909a6a0b05dSBen Gardon slot->base_gfn + slot->npages); 910a6a0b05dSBen Gardon 911a6a0b05dSBen Gardon kvm_mmu_put_root(kvm, root); 912a6a0b05dSBen Gardon } 913a6a0b05dSBen Gardon 914a6a0b05dSBen Gardon return spte_set; 915a6a0b05dSBen Gardon } 916a6a0b05dSBen Gardon 917a6a0b05dSBen Gardon /* 918a6a0b05dSBen Gardon * Clears the dirty status of all the 4k SPTEs mapping GFNs for which a bit is 919a6a0b05dSBen Gardon * set in mask, starting at gfn. The given memslot is expected to contain all 920a6a0b05dSBen Gardon * the GFNs represented by set bits in the mask. If AD bits are enabled, 921a6a0b05dSBen Gardon * clearing the dirty status will involve clearing the dirty bit on each SPTE 922a6a0b05dSBen Gardon * or, if AD bits are not enabled, clearing the writable bit on each SPTE. 923a6a0b05dSBen Gardon */ 924a6a0b05dSBen Gardon static void clear_dirty_pt_masked(struct kvm *kvm, struct kvm_mmu_page *root, 925a6a0b05dSBen Gardon gfn_t gfn, unsigned long mask, bool wrprot) 926a6a0b05dSBen Gardon { 927a6a0b05dSBen Gardon struct tdp_iter iter; 928a6a0b05dSBen Gardon u64 new_spte; 929a6a0b05dSBen Gardon 930a6a0b05dSBen Gardon tdp_root_for_each_leaf_pte(iter, root, gfn + __ffs(mask), 931a6a0b05dSBen Gardon gfn + BITS_PER_LONG) { 932a6a0b05dSBen Gardon if (!mask) 933a6a0b05dSBen Gardon break; 934a6a0b05dSBen Gardon 935a6a0b05dSBen Gardon if (iter.level > PG_LEVEL_4K || 936a6a0b05dSBen Gardon !(mask & (1UL << (iter.gfn - gfn)))) 937a6a0b05dSBen Gardon continue; 938a6a0b05dSBen Gardon 939a6a0b05dSBen Gardon if (wrprot || spte_ad_need_write_protect(iter.old_spte)) { 940a6a0b05dSBen Gardon if (is_writable_pte(iter.old_spte)) 941a6a0b05dSBen Gardon new_spte = iter.old_spte & ~PT_WRITABLE_MASK; 942a6a0b05dSBen Gardon else 943a6a0b05dSBen Gardon continue; 944a6a0b05dSBen Gardon } else { 945a6a0b05dSBen Gardon if (iter.old_spte & shadow_dirty_mask) 946a6a0b05dSBen Gardon new_spte = iter.old_spte & ~shadow_dirty_mask; 947a6a0b05dSBen Gardon else 948a6a0b05dSBen Gardon continue; 949a6a0b05dSBen Gardon } 950a6a0b05dSBen Gardon 951a6a0b05dSBen Gardon tdp_mmu_set_spte_no_dirty_log(kvm, &iter, new_spte); 952a6a0b05dSBen Gardon 953a6a0b05dSBen Gardon mask &= ~(1UL << (iter.gfn - gfn)); 954a6a0b05dSBen Gardon } 955a6a0b05dSBen Gardon } 956a6a0b05dSBen Gardon 957a6a0b05dSBen Gardon /* 958a6a0b05dSBen Gardon * Clears the dirty status of all the 4k SPTEs mapping GFNs for which a bit is 959a6a0b05dSBen Gardon * set in mask, starting at gfn. The given memslot is expected to contain all 960a6a0b05dSBen Gardon * the GFNs represented by set bits in the mask. If AD bits are enabled, 961a6a0b05dSBen Gardon * clearing the dirty status will involve clearing the dirty bit on each SPTE 962a6a0b05dSBen Gardon * or, if AD bits are not enabled, clearing the writable bit on each SPTE. 963a6a0b05dSBen Gardon */ 964a6a0b05dSBen Gardon void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm, 965a6a0b05dSBen Gardon struct kvm_memory_slot *slot, 966a6a0b05dSBen Gardon gfn_t gfn, unsigned long mask, 967a6a0b05dSBen Gardon bool wrprot) 968a6a0b05dSBen Gardon { 969a6a0b05dSBen Gardon struct kvm_mmu_page *root; 970a6a0b05dSBen Gardon int root_as_id; 971a6a0b05dSBen Gardon 972a6a0b05dSBen Gardon lockdep_assert_held(&kvm->mmu_lock); 973a6a0b05dSBen Gardon for_each_tdp_mmu_root(kvm, root) { 974a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 975a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 976a6a0b05dSBen Gardon continue; 977a6a0b05dSBen Gardon 978a6a0b05dSBen Gardon clear_dirty_pt_masked(kvm, root, gfn, mask, wrprot); 979a6a0b05dSBen Gardon } 980a6a0b05dSBen Gardon } 981a6a0b05dSBen Gardon 982a6a0b05dSBen Gardon /* 983a6a0b05dSBen Gardon * Set the dirty status of all the SPTEs mapping GFNs in the memslot. This is 984a6a0b05dSBen Gardon * only used for PML, and so will involve setting the dirty bit on each SPTE. 985a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 986a6a0b05dSBen Gardon */ 987a6a0b05dSBen Gardon static bool set_dirty_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root, 988a6a0b05dSBen Gardon gfn_t start, gfn_t end) 989a6a0b05dSBen Gardon { 990a6a0b05dSBen Gardon struct tdp_iter iter; 991a6a0b05dSBen Gardon u64 new_spte; 992a6a0b05dSBen Gardon bool spte_set = false; 993a6a0b05dSBen Gardon 994a6a0b05dSBen Gardon tdp_root_for_each_pte(iter, root, start, end) { 995a6a0b05dSBen Gardon if (!is_shadow_present_pte(iter.old_spte)) 996a6a0b05dSBen Gardon continue; 997a6a0b05dSBen Gardon 998a6a0b05dSBen Gardon new_spte = iter.old_spte | shadow_dirty_mask; 999a6a0b05dSBen Gardon 1000a6a0b05dSBen Gardon tdp_mmu_set_spte(kvm, &iter, new_spte); 1001a6a0b05dSBen Gardon spte_set = true; 1002a6a0b05dSBen Gardon 1003a6a0b05dSBen Gardon tdp_mmu_iter_cond_resched(kvm, &iter); 1004a6a0b05dSBen Gardon } 1005a6a0b05dSBen Gardon 1006a6a0b05dSBen Gardon return spte_set; 1007a6a0b05dSBen Gardon } 1008a6a0b05dSBen Gardon 1009a6a0b05dSBen Gardon /* 1010a6a0b05dSBen Gardon * Set the dirty status of all the SPTEs mapping GFNs in the memslot. This is 1011a6a0b05dSBen Gardon * only used for PML, and so will involve setting the dirty bit on each SPTE. 1012a6a0b05dSBen Gardon * Returns true if an SPTE has been changed and the TLBs need to be flushed. 1013a6a0b05dSBen Gardon */ 1014a6a0b05dSBen Gardon bool kvm_tdp_mmu_slot_set_dirty(struct kvm *kvm, struct kvm_memory_slot *slot) 1015a6a0b05dSBen Gardon { 1016a6a0b05dSBen Gardon struct kvm_mmu_page *root; 1017a6a0b05dSBen Gardon int root_as_id; 1018a6a0b05dSBen Gardon bool spte_set = false; 1019a6a0b05dSBen Gardon 1020a6a0b05dSBen Gardon for_each_tdp_mmu_root(kvm, root) { 1021a6a0b05dSBen Gardon root_as_id = kvm_mmu_page_as_id(root); 1022a6a0b05dSBen Gardon if (root_as_id != slot->as_id) 1023a6a0b05dSBen Gardon continue; 1024a6a0b05dSBen Gardon 1025a6a0b05dSBen Gardon /* 1026a6a0b05dSBen Gardon * Take a reference on the root so that it cannot be freed if 1027a6a0b05dSBen Gardon * this thread releases the MMU lock and yields in this loop. 1028a6a0b05dSBen Gardon */ 1029a6a0b05dSBen Gardon kvm_mmu_get_root(kvm, root); 1030a6a0b05dSBen Gardon 1031a6a0b05dSBen Gardon spte_set |= set_dirty_gfn_range(kvm, root, slot->base_gfn, 1032a6a0b05dSBen Gardon slot->base_gfn + slot->npages); 1033a6a0b05dSBen Gardon 1034a6a0b05dSBen Gardon kvm_mmu_put_root(kvm, root); 1035a6a0b05dSBen Gardon } 1036a6a0b05dSBen Gardon return spte_set; 1037a6a0b05dSBen Gardon } 1038a6a0b05dSBen Gardon 103914881998SBen Gardon /* 104014881998SBen Gardon * Clear non-leaf entries (and free associated page tables) which could 104114881998SBen Gardon * be replaced by large mappings, for GFNs within the slot. 104214881998SBen Gardon */ 104314881998SBen Gardon static void zap_collapsible_spte_range(struct kvm *kvm, 104414881998SBen Gardon struct kvm_mmu_page *root, 104514881998SBen Gardon gfn_t start, gfn_t end) 104614881998SBen Gardon { 104714881998SBen Gardon struct tdp_iter iter; 104814881998SBen Gardon kvm_pfn_t pfn; 104914881998SBen Gardon bool spte_set = false; 105014881998SBen Gardon 105114881998SBen Gardon tdp_root_for_each_pte(iter, root, start, end) { 105214881998SBen Gardon if (!is_shadow_present_pte(iter.old_spte) || 105314881998SBen Gardon is_last_spte(iter.old_spte, iter.level)) 105414881998SBen Gardon continue; 105514881998SBen Gardon 105614881998SBen Gardon pfn = spte_to_pfn(iter.old_spte); 105714881998SBen Gardon if (kvm_is_reserved_pfn(pfn) || 105814881998SBen Gardon !PageTransCompoundMap(pfn_to_page(pfn))) 105914881998SBen Gardon continue; 106014881998SBen Gardon 106114881998SBen Gardon tdp_mmu_set_spte(kvm, &iter, 0); 106214881998SBen Gardon 106314881998SBen Gardon spte_set = tdp_mmu_iter_flush_cond_resched(kvm, &iter); 106414881998SBen Gardon } 106514881998SBen Gardon 106614881998SBen Gardon if (spte_set) 106714881998SBen Gardon kvm_flush_remote_tlbs(kvm); 106814881998SBen Gardon } 106914881998SBen Gardon 107014881998SBen Gardon /* 107114881998SBen Gardon * Clear non-leaf entries (and free associated page tables) which could 107214881998SBen Gardon * be replaced by large mappings, for GFNs within the slot. 107314881998SBen Gardon */ 107414881998SBen Gardon void kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm, 107514881998SBen Gardon const struct kvm_memory_slot *slot) 107614881998SBen Gardon { 107714881998SBen Gardon struct kvm_mmu_page *root; 107814881998SBen Gardon int root_as_id; 107914881998SBen Gardon 108014881998SBen Gardon for_each_tdp_mmu_root(kvm, root) { 108114881998SBen Gardon root_as_id = kvm_mmu_page_as_id(root); 108214881998SBen Gardon if (root_as_id != slot->as_id) 108314881998SBen Gardon continue; 108414881998SBen Gardon 108514881998SBen Gardon /* 108614881998SBen Gardon * Take a reference on the root so that it cannot be freed if 108714881998SBen Gardon * this thread releases the MMU lock and yields in this loop. 108814881998SBen Gardon */ 108914881998SBen Gardon kvm_mmu_get_root(kvm, root); 109014881998SBen Gardon 109114881998SBen Gardon zap_collapsible_spte_range(kvm, root, slot->base_gfn, 109214881998SBen Gardon slot->base_gfn + slot->npages); 109314881998SBen Gardon 109414881998SBen Gardon kvm_mmu_put_root(kvm, root); 109514881998SBen Gardon } 109614881998SBen Gardon } 109746044f72SBen Gardon 109846044f72SBen Gardon /* 109946044f72SBen Gardon * Removes write access on the last level SPTE mapping this GFN and unsets the 110046044f72SBen Gardon * SPTE_MMU_WRITABLE bit to ensure future writes continue to be intercepted. 110146044f72SBen Gardon * Returns true if an SPTE was set and a TLB flush is needed. 110246044f72SBen Gardon */ 110346044f72SBen Gardon static bool write_protect_gfn(struct kvm *kvm, struct kvm_mmu_page *root, 110446044f72SBen Gardon gfn_t gfn) 110546044f72SBen Gardon { 110646044f72SBen Gardon struct tdp_iter iter; 110746044f72SBen Gardon u64 new_spte; 110846044f72SBen Gardon bool spte_set = false; 110946044f72SBen Gardon 111046044f72SBen Gardon tdp_root_for_each_leaf_pte(iter, root, gfn, gfn + 1) { 111146044f72SBen Gardon if (!is_writable_pte(iter.old_spte)) 111246044f72SBen Gardon break; 111346044f72SBen Gardon 111446044f72SBen Gardon new_spte = iter.old_spte & 111546044f72SBen Gardon ~(PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE); 111646044f72SBen Gardon 111746044f72SBen Gardon tdp_mmu_set_spte(kvm, &iter, new_spte); 111846044f72SBen Gardon spte_set = true; 111946044f72SBen Gardon } 112046044f72SBen Gardon 112146044f72SBen Gardon return spte_set; 112246044f72SBen Gardon } 112346044f72SBen Gardon 112446044f72SBen Gardon /* 112546044f72SBen Gardon * Removes write access on the last level SPTE mapping this GFN and unsets the 112646044f72SBen Gardon * SPTE_MMU_WRITABLE bit to ensure future writes continue to be intercepted. 112746044f72SBen Gardon * Returns true if an SPTE was set and a TLB flush is needed. 112846044f72SBen Gardon */ 112946044f72SBen Gardon bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm, 113046044f72SBen Gardon struct kvm_memory_slot *slot, gfn_t gfn) 113146044f72SBen Gardon { 113246044f72SBen Gardon struct kvm_mmu_page *root; 113346044f72SBen Gardon int root_as_id; 113446044f72SBen Gardon bool spte_set = false; 113546044f72SBen Gardon 113646044f72SBen Gardon lockdep_assert_held(&kvm->mmu_lock); 113746044f72SBen Gardon for_each_tdp_mmu_root(kvm, root) { 113846044f72SBen Gardon root_as_id = kvm_mmu_page_as_id(root); 113946044f72SBen Gardon if (root_as_id != slot->as_id) 114046044f72SBen Gardon continue; 114146044f72SBen Gardon 114246044f72SBen Gardon spte_set |= write_protect_gfn(kvm, root, gfn); 114346044f72SBen Gardon } 114446044f72SBen Gardon return spte_set; 114546044f72SBen Gardon } 114646044f72SBen Gardon 114795fb5b02SBen Gardon /* 114895fb5b02SBen Gardon * Return the level of the lowest level SPTE added to sptes. 114995fb5b02SBen Gardon * That SPTE may be non-present. 115095fb5b02SBen Gardon */ 115139b4d43eSSean Christopherson int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes, 115239b4d43eSSean Christopherson int *root_level) 115395fb5b02SBen Gardon { 115495fb5b02SBen Gardon struct tdp_iter iter; 115595fb5b02SBen Gardon struct kvm_mmu *mmu = vcpu->arch.mmu; 115695fb5b02SBen Gardon gfn_t gfn = addr >> PAGE_SHIFT; 11572aa07893SSean Christopherson int leaf = -1; 115895fb5b02SBen Gardon 115939b4d43eSSean Christopherson *root_level = vcpu->arch.mmu->shadow_root_level; 116039b4d43eSSean Christopherson 116195fb5b02SBen Gardon tdp_mmu_for_each_pte(iter, mmu, gfn, gfn + 1) { 116295fb5b02SBen Gardon leaf = iter.level; 1163*dde81f94SSean Christopherson sptes[leaf] = iter.old_spte; 116495fb5b02SBen Gardon } 116595fb5b02SBen Gardon 116695fb5b02SBen Gardon return leaf; 116795fb5b02SBen Gardon } 1168