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37c43753 MZ |
1 | /* |
2 | * Copyright (C) 2012,2013 - ARM Ltd | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #ifndef __ARM64_KVM_MMU_H__ | |
19 | #define __ARM64_KVM_MMU_H__ | |
20 | ||
21 | #include <asm/page.h> | |
22 | #include <asm/memory.h> | |
23 | ||
24 | /* | |
25 | * As we only have the TTBR0_EL2 register, we cannot express | |
26 | * "negative" addresses. This makes it impossible to directly share | |
27 | * mappings with the kernel. | |
28 | * | |
29 | * Instead, give the HYP mode its own VA region at a fixed offset from | |
30 | * the kernel by just masking the top bits (which are all ones for a | |
31 | * kernel address). | |
32 | */ | |
33 | #define HYP_PAGE_OFFSET_SHIFT VA_BITS | |
34 | #define HYP_PAGE_OFFSET_MASK ((UL(1) << HYP_PAGE_OFFSET_SHIFT) - 1) | |
35 | #define HYP_PAGE_OFFSET (PAGE_OFFSET & HYP_PAGE_OFFSET_MASK) | |
36 | ||
37 | /* | |
38 | * Our virtual mapping for the idmap-ed MMU-enable code. Must be | |
39 | * shared across all the page-tables. Conveniently, we use the last | |
40 | * possible page, where no kernel mapping will ever exist. | |
41 | */ | |
42 | #define TRAMPOLINE_VA (HYP_PAGE_OFFSET_MASK & PAGE_MASK) | |
43 | ||
38f791a4 CD |
44 | /* |
45 | * KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation | |
46 | * levels in addition to the PGD and potentially the PUD which are | |
47 | * pre-allocated (we pre-allocate the fake PGD and the PUD when the Stage-2 | |
48 | * tables use one level of tables less than the kernel. | |
49 | */ | |
50 | #ifdef CONFIG_ARM64_64K_PAGES | |
51 | #define KVM_MMU_CACHE_MIN_PAGES 1 | |
52 | #else | |
53 | #define KVM_MMU_CACHE_MIN_PAGES 2 | |
54 | #endif | |
55 | ||
37c43753 MZ |
56 | #ifdef __ASSEMBLY__ |
57 | ||
58 | /* | |
59 | * Convert a kernel VA into a HYP VA. | |
60 | * reg: VA to be converted. | |
61 | */ | |
62 | .macro kern_hyp_va reg | |
63 | and \reg, \reg, #HYP_PAGE_OFFSET_MASK | |
64 | .endm | |
65 | ||
66 | #else | |
67 | ||
38f791a4 | 68 | #include <asm/pgalloc.h> |
37c43753 MZ |
69 | #include <asm/cachetype.h> |
70 | #include <asm/cacheflush.h> | |
e4c5a685 AB |
71 | #include <asm/mmu_context.h> |
72 | #include <asm/pgtable.h> | |
37c43753 MZ |
73 | |
74 | #define KERN_TO_HYP(kva) ((unsigned long)kva - PAGE_OFFSET + HYP_PAGE_OFFSET) | |
75 | ||
76 | /* | |
dbff124e | 77 | * We currently only support a 40bit IPA. |
37c43753 | 78 | */ |
dbff124e | 79 | #define KVM_PHYS_SHIFT (40) |
37c43753 MZ |
80 | #define KVM_PHYS_SIZE (1UL << KVM_PHYS_SHIFT) |
81 | #define KVM_PHYS_MASK (KVM_PHYS_SIZE - 1UL) | |
82 | ||
37c43753 MZ |
83 | int create_hyp_mappings(void *from, void *to); |
84 | int create_hyp_io_mappings(void *from, void *to, phys_addr_t); | |
85 | void free_boot_hyp_pgd(void); | |
86 | void free_hyp_pgds(void); | |
87 | ||
957db105 | 88 | void stage2_unmap_vm(struct kvm *kvm); |
37c43753 MZ |
89 | int kvm_alloc_stage2_pgd(struct kvm *kvm); |
90 | void kvm_free_stage2_pgd(struct kvm *kvm); | |
91 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, | |
c40f2f8f | 92 | phys_addr_t pa, unsigned long size, bool writable); |
37c43753 MZ |
93 | |
94 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run); | |
95 | ||
96 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu); | |
97 | ||
98 | phys_addr_t kvm_mmu_get_httbr(void); | |
99 | phys_addr_t kvm_mmu_get_boot_httbr(void); | |
100 | phys_addr_t kvm_get_idmap_vector(void); | |
101 | int kvm_mmu_init(void); | |
102 | void kvm_clear_hyp_idmap(void); | |
103 | ||
104 | #define kvm_set_pte(ptep, pte) set_pte(ptep, pte) | |
ad361f09 | 105 | #define kvm_set_pmd(pmdp, pmd) set_pmd(pmdp, pmd) |
37c43753 | 106 | |
37c43753 | 107 | static inline void kvm_clean_pgd(pgd_t *pgd) {} |
38f791a4 | 108 | static inline void kvm_clean_pmd(pmd_t *pmd) {} |
37c43753 MZ |
109 | static inline void kvm_clean_pmd_entry(pmd_t *pmd) {} |
110 | static inline void kvm_clean_pte(pte_t *pte) {} | |
111 | static inline void kvm_clean_pte_entry(pte_t *pte) {} | |
112 | ||
113 | static inline void kvm_set_s2pte_writable(pte_t *pte) | |
114 | { | |
115 | pte_val(*pte) |= PTE_S2_RDWR; | |
116 | } | |
117 | ||
ad361f09 CD |
118 | static inline void kvm_set_s2pmd_writable(pmd_t *pmd) |
119 | { | |
120 | pmd_val(*pmd) |= PMD_S2_RDWR; | |
121 | } | |
122 | ||
8199ed0e MS |
123 | static inline void kvm_set_s2pte_readonly(pte_t *pte) |
124 | { | |
125 | pte_val(*pte) = (pte_val(*pte) & ~PTE_S2_RDWR) | PTE_S2_RDONLY; | |
126 | } | |
127 | ||
128 | static inline bool kvm_s2pte_readonly(pte_t *pte) | |
129 | { | |
130 | return (pte_val(*pte) & PTE_S2_RDWR) == PTE_S2_RDONLY; | |
131 | } | |
132 | ||
133 | static inline void kvm_set_s2pmd_readonly(pmd_t *pmd) | |
134 | { | |
135 | pmd_val(*pmd) = (pmd_val(*pmd) & ~PMD_S2_RDWR) | PMD_S2_RDONLY; | |
136 | } | |
137 | ||
138 | static inline bool kvm_s2pmd_readonly(pmd_t *pmd) | |
139 | { | |
140 | return (pmd_val(*pmd) & PMD_S2_RDWR) == PMD_S2_RDONLY; | |
141 | } | |
142 | ||
143 | ||
a3c8bd31 MZ |
144 | #define kvm_pgd_addr_end(addr, end) pgd_addr_end(addr, end) |
145 | #define kvm_pud_addr_end(addr, end) pud_addr_end(addr, end) | |
146 | #define kvm_pmd_addr_end(addr, end) pmd_addr_end(addr, end) | |
147 | ||
38f791a4 CD |
148 | /* |
149 | * In the case where PGDIR_SHIFT is larger than KVM_PHYS_SHIFT, we can address | |
150 | * the entire IPA input range with a single pgd entry, and we would only need | |
151 | * one pgd entry. Note that in this case, the pgd is actually not used by | |
152 | * the MMU for Stage-2 translations, but is merely a fake pgd used as a data | |
153 | * structure for the kernel pgtable macros to work. | |
154 | */ | |
155 | #if PGDIR_SHIFT > KVM_PHYS_SHIFT | |
156 | #define PTRS_PER_S2_PGD_SHIFT 0 | |
157 | #else | |
158 | #define PTRS_PER_S2_PGD_SHIFT (KVM_PHYS_SHIFT - PGDIR_SHIFT) | |
159 | #endif | |
160 | #define PTRS_PER_S2_PGD (1 << PTRS_PER_S2_PGD_SHIFT) | |
38f791a4 | 161 | |
04b8dc85 MZ |
162 | #define kvm_pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_S2_PGD - 1)) |
163 | ||
38f791a4 CD |
164 | /* |
165 | * If we are concatenating first level stage-2 page tables, we would have less | |
166 | * than or equal to 16 pointers in the fake PGD, because that's what the | |
9f25e6ad | 167 | * architecture allows. In this case, (4 - CONFIG_PGTABLE_LEVELS) |
38f791a4 CD |
168 | * represents the first level for the host, and we add 1 to go to the next |
169 | * level (which uses contatenation) for the stage-2 tables. | |
170 | */ | |
171 | #if PTRS_PER_S2_PGD <= 16 | |
9f25e6ad | 172 | #define KVM_PREALLOC_LEVEL (4 - CONFIG_PGTABLE_LEVELS + 1) |
38f791a4 CD |
173 | #else |
174 | #define KVM_PREALLOC_LEVEL (0) | |
175 | #endif | |
176 | ||
38f791a4 CD |
177 | static inline void *kvm_get_hwpgd(struct kvm *kvm) |
178 | { | |
179 | pgd_t *pgd = kvm->arch.pgd; | |
180 | pud_t *pud; | |
181 | ||
182 | if (KVM_PREALLOC_LEVEL == 0) | |
183 | return pgd; | |
184 | ||
185 | pud = pud_offset(pgd, 0); | |
186 | if (KVM_PREALLOC_LEVEL == 1) | |
187 | return pud; | |
188 | ||
189 | BUG_ON(KVM_PREALLOC_LEVEL != 2); | |
190 | return pmd_offset(pud, 0); | |
191 | } | |
192 | ||
a987370f | 193 | static inline unsigned int kvm_get_hwpgd_size(void) |
38f791a4 | 194 | { |
a987370f MZ |
195 | if (KVM_PREALLOC_LEVEL > 0) |
196 | return PTRS_PER_S2_PGD * PAGE_SIZE; | |
197 | return PTRS_PER_S2_PGD * sizeof(pgd_t); | |
38f791a4 CD |
198 | } |
199 | ||
4f853a71 CD |
200 | static inline bool kvm_page_empty(void *ptr) |
201 | { | |
202 | struct page *ptr_page = virt_to_page(ptr); | |
203 | return page_count(ptr_page) == 1; | |
204 | } | |
205 | ||
38f791a4 CD |
206 | #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep) |
207 | ||
208 | #ifdef __PAGETABLE_PMD_FOLDED | |
209 | #define kvm_pmd_table_empty(kvm, pmdp) (0) | |
210 | #else | |
211 | #define kvm_pmd_table_empty(kvm, pmdp) \ | |
212 | (kvm_page_empty(pmdp) && (!(kvm) || KVM_PREALLOC_LEVEL < 2)) | |
213 | #endif | |
214 | ||
215 | #ifdef __PAGETABLE_PUD_FOLDED | |
216 | #define kvm_pud_table_empty(kvm, pudp) (0) | |
4f853a71 | 217 | #else |
38f791a4 CD |
218 | #define kvm_pud_table_empty(kvm, pudp) \ |
219 | (kvm_page_empty(pudp) && (!(kvm) || KVM_PREALLOC_LEVEL < 1)) | |
4f853a71 | 220 | #endif |
4f853a71 CD |
221 | |
222 | ||
37c43753 MZ |
223 | struct kvm; |
224 | ||
2d58b733 MZ |
225 | #define kvm_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l)) |
226 | ||
227 | static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu) | |
37c43753 | 228 | { |
2d58b733 MZ |
229 | return (vcpu_sys_reg(vcpu, SCTLR_EL1) & 0b101) == 0b101; |
230 | } | |
231 | ||
0d3e4d4f MZ |
232 | static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu, pfn_t pfn, |
233 | unsigned long size, | |
234 | bool ipa_uncached) | |
2d58b733 | 235 | { |
0d3e4d4f MZ |
236 | void *va = page_address(pfn_to_page(pfn)); |
237 | ||
840f4bfb | 238 | if (!vcpu_has_cache_enabled(vcpu) || ipa_uncached) |
0d3e4d4f | 239 | kvm_flush_dcache_to_poc(va, size); |
2d58b733 | 240 | |
37c43753 | 241 | if (!icache_is_aliasing()) { /* PIPT */ |
0d3e4d4f MZ |
242 | flush_icache_range((unsigned long)va, |
243 | (unsigned long)va + size); | |
37c43753 MZ |
244 | } else if (!icache_is_aivivt()) { /* non ASID-tagged VIVT */ |
245 | /* any kind of VIPT cache */ | |
246 | __flush_icache_all(); | |
247 | } | |
248 | } | |
249 | ||
363ef89f MZ |
250 | static inline void __kvm_flush_dcache_pte(pte_t pte) |
251 | { | |
252 | struct page *page = pte_page(pte); | |
253 | kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE); | |
254 | } | |
255 | ||
256 | static inline void __kvm_flush_dcache_pmd(pmd_t pmd) | |
257 | { | |
258 | struct page *page = pmd_page(pmd); | |
259 | kvm_flush_dcache_to_poc(page_address(page), PMD_SIZE); | |
260 | } | |
261 | ||
262 | static inline void __kvm_flush_dcache_pud(pud_t pud) | |
263 | { | |
264 | struct page *page = pud_page(pud); | |
265 | kvm_flush_dcache_to_poc(page_address(page), PUD_SIZE); | |
266 | } | |
267 | ||
4fda342c | 268 | #define kvm_virt_to_phys(x) __virt_to_phys((unsigned long)(x)) |
37c43753 | 269 | |
3c1e7165 MZ |
270 | void kvm_set_way_flush(struct kvm_vcpu *vcpu); |
271 | void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled); | |
9d218a1f | 272 | |
e4c5a685 AB |
273 | static inline bool __kvm_cpu_uses_extended_idmap(void) |
274 | { | |
275 | return __cpu_uses_extended_idmap(); | |
276 | } | |
277 | ||
278 | static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd, | |
279 | pgd_t *hyp_pgd, | |
280 | pgd_t *merged_hyp_pgd, | |
281 | unsigned long hyp_idmap_start) | |
282 | { | |
283 | int idmap_idx; | |
284 | ||
285 | /* | |
286 | * Use the first entry to access the HYP mappings. It is | |
287 | * guaranteed to be free, otherwise we wouldn't use an | |
288 | * extended idmap. | |
289 | */ | |
290 | VM_BUG_ON(pgd_val(merged_hyp_pgd[0])); | |
291 | merged_hyp_pgd[0] = __pgd(__pa(hyp_pgd) | PMD_TYPE_TABLE); | |
292 | ||
293 | /* | |
294 | * Create another extended level entry that points to the boot HYP map, | |
295 | * which contains an ID mapping of the HYP init code. We essentially | |
296 | * merge the boot and runtime HYP maps by doing so, but they don't | |
297 | * overlap anyway, so this is fine. | |
298 | */ | |
299 | idmap_idx = hyp_idmap_start >> VA_BITS; | |
300 | VM_BUG_ON(pgd_val(merged_hyp_pgd[idmap_idx])); | |
301 | merged_hyp_pgd[idmap_idx] = __pgd(__pa(boot_hyp_pgd) | PMD_TYPE_TABLE); | |
302 | } | |
303 | ||
37c43753 MZ |
304 | #endif /* __ASSEMBLY__ */ |
305 | #endif /* __ARM64_KVM_MMU_H__ */ |