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342cd0ab CD |
1 | /* |
2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
3 | * Author: Christoffer Dall <c.dall@virtualopensystems.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, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
18 | ||
19 | #ifndef __ARM_KVM_MMU_H__ | |
20 | #define __ARM_KVM_MMU_H__ | |
21 | ||
5a677ce0 MZ |
22 | #include <asm/memory.h> |
23 | #include <asm/page.h> | |
c62ee2b2 | 24 | |
06e8c3b0 MZ |
25 | /* |
26 | * We directly use the kernel VA for the HYP, as we can directly share | |
27 | * the mapping (HTTBR "covers" TTBR1). | |
28 | */ | |
5a677ce0 | 29 | #define HYP_PAGE_OFFSET_MASK UL(~0) |
06e8c3b0 MZ |
30 | #define HYP_PAGE_OFFSET PAGE_OFFSET |
31 | #define KERN_TO_HYP(kva) (kva) | |
32 | ||
5a677ce0 MZ |
33 | /* |
34 | * Our virtual mapping for the boot-time MMU-enable code. Must be | |
35 | * shared across all the page-tables. Conveniently, we use the vectors | |
36 | * page, where no kernel data will ever be shared with HYP. | |
37 | */ | |
38 | #define TRAMPOLINE_VA UL(CONFIG_VECTORS_BASE) | |
39 | ||
38f791a4 CD |
40 | /* |
41 | * KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels. | |
42 | */ | |
43 | #define KVM_MMU_CACHE_MIN_PAGES 2 | |
44 | ||
5a677ce0 MZ |
45 | #ifndef __ASSEMBLY__ |
46 | ||
363ef89f | 47 | #include <linux/highmem.h> |
5a677ce0 MZ |
48 | #include <asm/cacheflush.h> |
49 | #include <asm/pgalloc.h> | |
50 | ||
342cd0ab CD |
51 | int create_hyp_mappings(void *from, void *to); |
52 | int create_hyp_io_mappings(void *from, void *to, phys_addr_t); | |
d157f4a5 | 53 | void free_boot_hyp_pgd(void); |
4f728276 | 54 | void free_hyp_pgds(void); |
342cd0ab | 55 | |
957db105 | 56 | void stage2_unmap_vm(struct kvm *kvm); |
d5d8184d CD |
57 | int kvm_alloc_stage2_pgd(struct kvm *kvm); |
58 | void kvm_free_stage2_pgd(struct kvm *kvm); | |
59 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, | |
c40f2f8f | 60 | phys_addr_t pa, unsigned long size, bool writable); |
d5d8184d CD |
61 | |
62 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run); | |
63 | ||
64 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu); | |
65 | ||
342cd0ab | 66 | phys_addr_t kvm_mmu_get_httbr(void); |
5a677ce0 MZ |
67 | phys_addr_t kvm_mmu_get_boot_httbr(void); |
68 | phys_addr_t kvm_get_idmap_vector(void); | |
342cd0ab CD |
69 | int kvm_mmu_init(void); |
70 | void kvm_clear_hyp_idmap(void); | |
94f8e641 | 71 | |
ad361f09 CD |
72 | static inline void kvm_set_pmd(pmd_t *pmd, pmd_t new_pmd) |
73 | { | |
74 | *pmd = new_pmd; | |
75 | flush_pmd_entry(pmd); | |
76 | } | |
77 | ||
c62ee2b2 MZ |
78 | static inline void kvm_set_pte(pte_t *pte, pte_t new_pte) |
79 | { | |
0963e5d0 | 80 | *pte = new_pte; |
c62ee2b2 MZ |
81 | /* |
82 | * flush_pmd_entry just takes a void pointer and cleans the necessary | |
83 | * cache entries, so we can reuse the function for ptes. | |
84 | */ | |
85 | flush_pmd_entry(pte); | |
86 | } | |
87 | ||
c62ee2b2 MZ |
88 | static inline void kvm_clean_pgd(pgd_t *pgd) |
89 | { | |
90 | clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t)); | |
91 | } | |
92 | ||
38f791a4 CD |
93 | static inline void kvm_clean_pmd(pmd_t *pmd) |
94 | { | |
95 | clean_dcache_area(pmd, PTRS_PER_PMD * sizeof(pmd_t)); | |
96 | } | |
97 | ||
c62ee2b2 MZ |
98 | static inline void kvm_clean_pmd_entry(pmd_t *pmd) |
99 | { | |
100 | clean_pmd_entry(pmd); | |
101 | } | |
102 | ||
103 | static inline void kvm_clean_pte(pte_t *pte) | |
104 | { | |
105 | clean_pte_table(pte); | |
106 | } | |
107 | ||
108 | static inline void kvm_set_s2pte_writable(pte_t *pte) | |
109 | { | |
110 | pte_val(*pte) |= L_PTE_S2_RDWR; | |
111 | } | |
112 | ||
ad361f09 CD |
113 | static inline void kvm_set_s2pmd_writable(pmd_t *pmd) |
114 | { | |
115 | pmd_val(*pmd) |= L_PMD_S2_RDWR; | |
116 | } | |
117 | ||
c6473555 MS |
118 | static inline void kvm_set_s2pte_readonly(pte_t *pte) |
119 | { | |
120 | pte_val(*pte) = (pte_val(*pte) & ~L_PTE_S2_RDWR) | L_PTE_S2_RDONLY; | |
121 | } | |
122 | ||
123 | static inline bool kvm_s2pte_readonly(pte_t *pte) | |
124 | { | |
125 | return (pte_val(*pte) & L_PTE_S2_RDWR) == L_PTE_S2_RDONLY; | |
126 | } | |
127 | ||
128 | static inline void kvm_set_s2pmd_readonly(pmd_t *pmd) | |
129 | { | |
130 | pmd_val(*pmd) = (pmd_val(*pmd) & ~L_PMD_S2_RDWR) | L_PMD_S2_RDONLY; | |
131 | } | |
132 | ||
133 | static inline bool kvm_s2pmd_readonly(pmd_t *pmd) | |
134 | { | |
135 | return (pmd_val(*pmd) & L_PMD_S2_RDWR) == L_PMD_S2_RDONLY; | |
136 | } | |
137 | ||
138 | ||
a3c8bd31 MZ |
139 | /* Open coded p*d_addr_end that can deal with 64bit addresses */ |
140 | #define kvm_pgd_addr_end(addr, end) \ | |
141 | ({ u64 __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \ | |
142 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
143 | }) | |
144 | ||
145 | #define kvm_pud_addr_end(addr,end) (end) | |
146 | ||
147 | #define kvm_pmd_addr_end(addr, end) \ | |
148 | ({ u64 __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \ | |
149 | (__boundary - 1 < (end) - 1)? __boundary: (end); \ | |
150 | }) | |
151 | ||
04b8dc85 MZ |
152 | #define kvm_pgd_index(addr) pgd_index(addr) |
153 | ||
4f853a71 CD |
154 | static inline bool kvm_page_empty(void *ptr) |
155 | { | |
156 | struct page *ptr_page = virt_to_page(ptr); | |
157 | return page_count(ptr_page) == 1; | |
158 | } | |
159 | ||
38f791a4 CD |
160 | #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep) |
161 | #define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp) | |
162 | #define kvm_pud_table_empty(kvm, pudp) (0) | |
163 | ||
164 | #define KVM_PREALLOC_LEVEL 0 | |
4f853a71 | 165 | |
a987370f | 166 | static inline void *kvm_get_hwpgd(struct kvm *kvm) |
38f791a4 | 167 | { |
a987370f | 168 | return kvm->arch.pgd; |
38f791a4 CD |
169 | } |
170 | ||
a987370f | 171 | static inline unsigned int kvm_get_hwpgd_size(void) |
38f791a4 | 172 | { |
a987370f | 173 | return PTRS_PER_S2_PGD * sizeof(pgd_t); |
38f791a4 | 174 | } |
4f853a71 | 175 | |
c62ee2b2 MZ |
176 | struct kvm; |
177 | ||
15979300 MZ |
178 | #define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l)) |
179 | ||
180 | static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu) | |
181 | { | |
182 | return (vcpu->arch.cp15[c1_SCTLR] & 0b101) == 0b101; | |
183 | } | |
184 | ||
ba049e93 DW |
185 | static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu, |
186 | kvm_pfn_t pfn, | |
0d3e4d4f MZ |
187 | unsigned long size, |
188 | bool ipa_uncached) | |
c62ee2b2 MZ |
189 | { |
190 | /* | |
191 | * If we are going to insert an instruction page and the icache is | |
192 | * either VIPT or PIPT, there is a potential problem where the host | |
193 | * (or another VM) may have used the same page as this guest, and we | |
194 | * read incorrect data from the icache. If we're using a PIPT cache, | |
195 | * we can invalidate just that page, but if we are using a VIPT cache | |
196 | * we need to invalidate the entire icache - damn shame - as written | |
197 | * in the ARM ARM (DDI 0406C.b - Page B3-1393). | |
198 | * | |
199 | * VIVT caches are tagged using both the ASID and the VMID and doesn't | |
200 | * need any kind of flushing (DDI 0406C.b - Page B3-1392). | |
0d3e4d4f MZ |
201 | * |
202 | * We need to do this through a kernel mapping (using the | |
203 | * user-space mapping has proved to be the wrong | |
204 | * solution). For that, we need to kmap one page at a time, | |
205 | * and iterate over the range. | |
c62ee2b2 | 206 | */ |
0d3e4d4f MZ |
207 | |
208 | bool need_flush = !vcpu_has_cache_enabled(vcpu) || ipa_uncached; | |
209 | ||
a050dfb2 | 210 | VM_BUG_ON(size & ~PAGE_MASK); |
0d3e4d4f MZ |
211 | |
212 | if (!need_flush && !icache_is_pipt()) | |
213 | goto vipt_cache; | |
214 | ||
215 | while (size) { | |
216 | void *va = kmap_atomic_pfn(pfn); | |
217 | ||
218 | if (need_flush) | |
219 | kvm_flush_dcache_to_poc(va, PAGE_SIZE); | |
220 | ||
221 | if (icache_is_pipt()) | |
222 | __cpuc_coherent_user_range((unsigned long)va, | |
223 | (unsigned long)va + PAGE_SIZE); | |
224 | ||
225 | size -= PAGE_SIZE; | |
226 | pfn++; | |
227 | ||
228 | kunmap_atomic(va); | |
229 | } | |
230 | ||
231 | vipt_cache: | |
232 | if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) { | |
c62ee2b2 MZ |
233 | /* any kind of VIPT cache */ |
234 | __flush_icache_all(); | |
235 | } | |
236 | } | |
237 | ||
363ef89f MZ |
238 | static inline void __kvm_flush_dcache_pte(pte_t pte) |
239 | { | |
240 | void *va = kmap_atomic(pte_page(pte)); | |
241 | ||
242 | kvm_flush_dcache_to_poc(va, PAGE_SIZE); | |
243 | ||
244 | kunmap_atomic(va); | |
245 | } | |
246 | ||
247 | static inline void __kvm_flush_dcache_pmd(pmd_t pmd) | |
248 | { | |
249 | unsigned long size = PMD_SIZE; | |
ba049e93 | 250 | kvm_pfn_t pfn = pmd_pfn(pmd); |
363ef89f MZ |
251 | |
252 | while (size) { | |
253 | void *va = kmap_atomic_pfn(pfn); | |
254 | ||
255 | kvm_flush_dcache_to_poc(va, PAGE_SIZE); | |
256 | ||
257 | pfn++; | |
258 | size -= PAGE_SIZE; | |
259 | ||
260 | kunmap_atomic(va); | |
261 | } | |
262 | } | |
263 | ||
264 | static inline void __kvm_flush_dcache_pud(pud_t pud) | |
265 | { | |
266 | } | |
267 | ||
4fda342c | 268 | #define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x)) |
5a677ce0 | 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 false; | |
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 | ||
20475f78 VM |
283 | static inline unsigned int kvm_get_vmid_bits(void) |
284 | { | |
285 | return 8; | |
286 | } | |
287 | ||
5a677ce0 MZ |
288 | #endif /* !__ASSEMBLY__ */ |
289 | ||
342cd0ab | 290 | #endif /* __ARM_KVM_MMU_H__ */ |