1 // SPDX-License-Identifier: GPL-2.0 2 3 #ifndef __KVM_X86_MMU_TDP_MMU_H 4 #define __KVM_X86_MMU_TDP_MMU_H 5 6 #include <linux/kvm_host.h> 7 8 hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu); 9 10 __must_check static inline bool kvm_tdp_mmu_get_root(struct kvm *kvm, 11 struct kvm_mmu_page *root) 12 { 13 if (root->role.invalid) 14 return false; 15 16 return refcount_inc_not_zero(&root->tdp_mmu_root_count); 17 } 18 19 void kvm_tdp_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *root, 20 bool shared); 21 22 bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, gfn_t start, 23 gfn_t end, bool can_yield, bool flush); 24 static inline bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, 25 gfn_t start, gfn_t end, bool flush) 26 { 27 return __kvm_tdp_mmu_zap_gfn_range(kvm, as_id, start, end, true, flush); 28 } 29 static inline bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp) 30 { 31 gfn_t end = sp->gfn + KVM_PAGES_PER_HPAGE(sp->role.level + 1); 32 33 /* 34 * Don't allow yielding, as the caller may have a flush pending. Note, 35 * if mmu_lock is held for write, zapping will never yield in this case, 36 * but explicitly disallow it for safety. The TDP MMU does not yield 37 * until it has made forward progress (steps sideways), and when zapping 38 * a single shadow page that it's guaranteed to see (thus the mmu_lock 39 * requirement), its "step sideways" will always step beyond the bounds 40 * of the shadow page's gfn range and stop iterating before yielding. 41 */ 42 lockdep_assert_held_write(&kvm->mmu_lock); 43 return __kvm_tdp_mmu_zap_gfn_range(kvm, kvm_mmu_page_as_id(sp), 44 sp->gfn, end, false, false); 45 } 46 47 void kvm_tdp_mmu_zap_all(struct kvm *kvm); 48 void kvm_tdp_mmu_invalidate_all_roots(struct kvm *kvm); 49 void kvm_tdp_mmu_zap_invalidated_roots(struct kvm *kvm); 50 51 int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault); 52 53 bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range, 54 bool flush); 55 bool kvm_tdp_mmu_age_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); 56 bool kvm_tdp_mmu_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); 57 bool kvm_tdp_mmu_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range); 58 59 bool kvm_tdp_mmu_wrprot_slot(struct kvm *kvm, 60 const struct kvm_memory_slot *slot, int min_level); 61 bool kvm_tdp_mmu_clear_dirty_slot(struct kvm *kvm, 62 const struct kvm_memory_slot *slot); 63 void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm, 64 struct kvm_memory_slot *slot, 65 gfn_t gfn, unsigned long mask, 66 bool wrprot); 67 void kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm, 68 const struct kvm_memory_slot *slot); 69 70 bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm, 71 struct kvm_memory_slot *slot, gfn_t gfn, 72 int min_level); 73 74 static inline void kvm_tdp_mmu_walk_lockless_begin(void) 75 { 76 rcu_read_lock(); 77 } 78 79 static inline void kvm_tdp_mmu_walk_lockless_end(void) 80 { 81 rcu_read_unlock(); 82 } 83 84 int kvm_tdp_mmu_get_walk(struct kvm_vcpu *vcpu, u64 addr, u64 *sptes, 85 int *root_level); 86 u64 *kvm_tdp_mmu_fast_pf_get_last_sptep(struct kvm_vcpu *vcpu, u64 addr, 87 u64 *spte); 88 89 #ifdef CONFIG_X86_64 90 bool kvm_mmu_init_tdp_mmu(struct kvm *kvm); 91 void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm); 92 static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return sp->tdp_mmu_page; } 93 94 static inline bool is_tdp_mmu(struct kvm_mmu *mmu) 95 { 96 struct kvm_mmu_page *sp; 97 hpa_t hpa = mmu->root_hpa; 98 99 if (WARN_ON(!VALID_PAGE(hpa))) 100 return false; 101 102 /* 103 * A NULL shadow page is legal when shadowing a non-paging guest with 104 * PAE paging, as the MMU will be direct with root_hpa pointing at the 105 * pae_root page, not a shadow page. 106 */ 107 sp = to_shadow_page(hpa); 108 return sp && is_tdp_mmu_page(sp) && sp->root_count; 109 } 110 #else 111 static inline bool kvm_mmu_init_tdp_mmu(struct kvm *kvm) { return false; } 112 static inline void kvm_mmu_uninit_tdp_mmu(struct kvm *kvm) {} 113 static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return false; } 114 static inline bool is_tdp_mmu(struct kvm_mmu *mmu) { return false; } 115 #endif 116 117 #endif /* __KVM_X86_MMU_TDP_MMU_H */ 118