1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020 - Google LLC 4 * Author: Quentin Perret <qperret@google.com> 5 */ 6 #ifndef __ARM64_KVM_PKVM_H__ 7 #define __ARM64_KVM_PKVM_H__ 8 9 #include <linux/arm_ffa.h> 10 #include <linux/memblock.h> 11 #include <linux/scatterlist.h> 12 #include <asm/kvm_pgtable.h> 13 14 /* Maximum number of VMs that can co-exist under pKVM. */ 15 #define KVM_MAX_PVMS 255 16 17 #define HYP_MEMBLOCK_REGIONS 128 18 19 int pkvm_init_host_vm(struct kvm *kvm); 20 int pkvm_create_hyp_vm(struct kvm *kvm); 21 void pkvm_destroy_hyp_vm(struct kvm *kvm); 22 23 /* 24 * This functions as an allow-list of protected VM capabilities. 25 * Features not explicitly allowed by this function are denied. 26 */ 27 static inline bool kvm_pvm_ext_allowed(long ext) 28 { 29 switch (ext) { 30 case KVM_CAP_IRQCHIP: 31 case KVM_CAP_ARM_PSCI: 32 case KVM_CAP_ARM_PSCI_0_2: 33 case KVM_CAP_NR_VCPUS: 34 case KVM_CAP_MAX_VCPUS: 35 case KVM_CAP_MAX_VCPU_ID: 36 case KVM_CAP_MSI_DEVID: 37 case KVM_CAP_ARM_VM_IPA_SIZE: 38 case KVM_CAP_ARM_PMU_V3: 39 case KVM_CAP_ARM_SVE: 40 case KVM_CAP_ARM_PTRAUTH_ADDRESS: 41 case KVM_CAP_ARM_PTRAUTH_GENERIC: 42 return true; 43 default: 44 return false; 45 } 46 } 47 48 extern struct memblock_region kvm_nvhe_sym(hyp_memory)[]; 49 extern unsigned int kvm_nvhe_sym(hyp_memblock_nr); 50 51 static inline unsigned long 52 hyp_vmemmap_memblock_size(struct memblock_region *reg, size_t vmemmap_entry_size) 53 { 54 unsigned long nr_pages = reg->size >> PAGE_SHIFT; 55 unsigned long start, end; 56 57 start = (reg->base >> PAGE_SHIFT) * vmemmap_entry_size; 58 end = start + nr_pages * vmemmap_entry_size; 59 start = ALIGN_DOWN(start, PAGE_SIZE); 60 end = ALIGN(end, PAGE_SIZE); 61 62 return end - start; 63 } 64 65 static inline unsigned long hyp_vmemmap_pages(size_t vmemmap_entry_size) 66 { 67 unsigned long res = 0, i; 68 69 for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) { 70 res += hyp_vmemmap_memblock_size(&kvm_nvhe_sym(hyp_memory)[i], 71 vmemmap_entry_size); 72 } 73 74 return res >> PAGE_SHIFT; 75 } 76 77 static inline unsigned long hyp_vm_table_pages(void) 78 { 79 return PAGE_ALIGN(KVM_MAX_PVMS * sizeof(void *)) >> PAGE_SHIFT; 80 } 81 82 static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages) 83 { 84 unsigned long total = 0; 85 int i; 86 87 /* Provision the worst case scenario */ 88 for (i = KVM_PGTABLE_FIRST_LEVEL; i <= KVM_PGTABLE_LAST_LEVEL; i++) { 89 nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE); 90 total += nr_pages; 91 } 92 93 return total; 94 } 95 96 static inline unsigned long __hyp_pgtable_total_pages(void) 97 { 98 unsigned long res = 0, i; 99 100 /* Cover all of memory with page-granularity */ 101 for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) { 102 struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i]; 103 res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT); 104 } 105 106 return res; 107 } 108 109 static inline unsigned long hyp_s1_pgtable_pages(void) 110 { 111 unsigned long res; 112 113 res = __hyp_pgtable_total_pages(); 114 115 /* Allow 1 GiB for private mappings */ 116 res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT); 117 118 return res; 119 } 120 121 static inline unsigned long host_s2_pgtable_pages(void) 122 { 123 unsigned long res; 124 125 /* 126 * Include an extra 16 pages to safely upper-bound the worst case of 127 * concatenated pgds. 128 */ 129 res = __hyp_pgtable_total_pages() + 16; 130 131 /* Allow 1 GiB for MMIO mappings */ 132 res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT); 133 134 return res; 135 } 136 137 #define KVM_FFA_MBOX_NR_PAGES 1 138 139 static inline unsigned long hyp_ffa_proxy_pages(void) 140 { 141 size_t desc_max; 142 143 /* 144 * The hypervisor FFA proxy needs enough memory to buffer a fragmented 145 * descriptor returned from EL3 in response to a RETRIEVE_REQ call. 146 */ 147 desc_max = sizeof(struct ffa_mem_region) + 148 sizeof(struct ffa_mem_region_attributes) + 149 sizeof(struct ffa_composite_mem_region) + 150 SG_MAX_SEGMENTS * sizeof(struct ffa_mem_region_addr_range); 151 152 /* Plus a page each for the hypervisor's RX and TX mailboxes. */ 153 return (2 * KVM_FFA_MBOX_NR_PAGES) + DIV_ROUND_UP(desc_max, PAGE_SIZE); 154 } 155 156 static inline size_t pkvm_host_sve_state_size(void) 157 { 158 if (!system_supports_sve()) 159 return 0; 160 161 return size_add(sizeof(struct cpu_sve_state), 162 SVE_SIG_REGS_SIZE(sve_vq_from_vl(kvm_host_sve_max_vl))); 163 } 164 165 struct pkvm_mapping { 166 struct rb_node node; 167 u64 gfn; 168 u64 pfn; 169 }; 170 171 int pkvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu, 172 struct kvm_pgtable_mm_ops *mm_ops); 173 void pkvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt); 174 int pkvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size, u64 phys, 175 enum kvm_pgtable_prot prot, void *mc, 176 enum kvm_pgtable_walk_flags flags); 177 int pkvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size); 178 int pkvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size); 179 int pkvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size); 180 bool pkvm_pgtable_stage2_test_clear_young(struct kvm_pgtable *pgt, u64 addr, u64 size, bool mkold); 181 int pkvm_pgtable_stage2_relax_perms(struct kvm_pgtable *pgt, u64 addr, enum kvm_pgtable_prot prot, 182 enum kvm_pgtable_walk_flags flags); 183 void pkvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr, 184 enum kvm_pgtable_walk_flags flags); 185 int pkvm_pgtable_stage2_split(struct kvm_pgtable *pgt, u64 addr, u64 size, 186 struct kvm_mmu_memory_cache *mc); 187 void pkvm_pgtable_stage2_free_unlinked(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, s8 level); 188 kvm_pte_t *pkvm_pgtable_stage2_create_unlinked(struct kvm_pgtable *pgt, u64 phys, s8 level, 189 enum kvm_pgtable_prot prot, void *mc, 190 bool force_pte); 191 #endif /* __ARM64_KVM_PKVM_H__ */ 192