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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 | */ | |
6c41a413 | 29 | #define kern_hyp_va(kva) (kva) |
06e8c3b0 | 30 | |
38f791a4 CD |
31 | /* |
32 | * KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels. | |
33 | */ | |
34 | #define KVM_MMU_CACHE_MIN_PAGES 2 | |
35 | ||
5a677ce0 MZ |
36 | #ifndef __ASSEMBLY__ |
37 | ||
363ef89f | 38 | #include <linux/highmem.h> |
5a677ce0 MZ |
39 | #include <asm/cacheflush.h> |
40 | #include <asm/pgalloc.h> | |
b1ae9a30 | 41 | #include <asm/stage2_pgtable.h> |
5a677ce0 | 42 | |
c8dddecd | 43 | int create_hyp_mappings(void *from, void *to, pgprot_t prot); |
342cd0ab | 44 | int create_hyp_io_mappings(void *from, void *to, phys_addr_t); |
4f728276 | 45 | void free_hyp_pgds(void); |
342cd0ab | 46 | |
957db105 | 47 | void stage2_unmap_vm(struct kvm *kvm); |
d5d8184d CD |
48 | int kvm_alloc_stage2_pgd(struct kvm *kvm); |
49 | void kvm_free_stage2_pgd(struct kvm *kvm); | |
50 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, | |
c40f2f8f | 51 | phys_addr_t pa, unsigned long size, bool writable); |
d5d8184d CD |
52 | |
53 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run); | |
54 | ||
55 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu); | |
56 | ||
342cd0ab | 57 | phys_addr_t kvm_mmu_get_httbr(void); |
5a677ce0 | 58 | phys_addr_t kvm_get_idmap_vector(void); |
67f69197 | 59 | phys_addr_t kvm_get_idmap_start(void); |
342cd0ab CD |
60 | int kvm_mmu_init(void); |
61 | void kvm_clear_hyp_idmap(void); | |
94f8e641 | 62 | |
ad361f09 CD |
63 | static inline void kvm_set_pmd(pmd_t *pmd, pmd_t new_pmd) |
64 | { | |
65 | *pmd = new_pmd; | |
66 | flush_pmd_entry(pmd); | |
67 | } | |
68 | ||
c62ee2b2 MZ |
69 | static inline void kvm_set_pte(pte_t *pte, pte_t new_pte) |
70 | { | |
0963e5d0 | 71 | *pte = new_pte; |
c62ee2b2 MZ |
72 | /* |
73 | * flush_pmd_entry just takes a void pointer and cleans the necessary | |
74 | * cache entries, so we can reuse the function for ptes. | |
75 | */ | |
76 | flush_pmd_entry(pte); | |
77 | } | |
78 | ||
c62ee2b2 MZ |
79 | static inline void kvm_clean_pgd(pgd_t *pgd) |
80 | { | |
81 | clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t)); | |
82 | } | |
83 | ||
38f791a4 CD |
84 | static inline void kvm_clean_pmd(pmd_t *pmd) |
85 | { | |
86 | clean_dcache_area(pmd, PTRS_PER_PMD * sizeof(pmd_t)); | |
87 | } | |
88 | ||
c62ee2b2 MZ |
89 | static inline void kvm_clean_pmd_entry(pmd_t *pmd) |
90 | { | |
91 | clean_pmd_entry(pmd); | |
92 | } | |
93 | ||
94 | static inline void kvm_clean_pte(pte_t *pte) | |
95 | { | |
96 | clean_pte_table(pte); | |
97 | } | |
98 | ||
06485053 | 99 | static inline pte_t kvm_s2pte_mkwrite(pte_t pte) |
c62ee2b2 | 100 | { |
06485053 CM |
101 | pte_val(pte) |= L_PTE_S2_RDWR; |
102 | return pte; | |
c62ee2b2 MZ |
103 | } |
104 | ||
06485053 | 105 | static inline pmd_t kvm_s2pmd_mkwrite(pmd_t pmd) |
ad361f09 | 106 | { |
06485053 CM |
107 | pmd_val(pmd) |= L_PMD_S2_RDWR; |
108 | return pmd; | |
ad361f09 CD |
109 | } |
110 | ||
c6473555 MS |
111 | static inline void kvm_set_s2pte_readonly(pte_t *pte) |
112 | { | |
113 | pte_val(*pte) = (pte_val(*pte) & ~L_PTE_S2_RDWR) | L_PTE_S2_RDONLY; | |
114 | } | |
115 | ||
116 | static inline bool kvm_s2pte_readonly(pte_t *pte) | |
117 | { | |
118 | return (pte_val(*pte) & L_PTE_S2_RDWR) == L_PTE_S2_RDONLY; | |
119 | } | |
120 | ||
121 | static inline void kvm_set_s2pmd_readonly(pmd_t *pmd) | |
122 | { | |
123 | pmd_val(*pmd) = (pmd_val(*pmd) & ~L_PMD_S2_RDWR) | L_PMD_S2_RDONLY; | |
124 | } | |
125 | ||
126 | static inline bool kvm_s2pmd_readonly(pmd_t *pmd) | |
127 | { | |
128 | return (pmd_val(*pmd) & L_PMD_S2_RDWR) == L_PMD_S2_RDONLY; | |
129 | } | |
130 | ||
4f853a71 CD |
131 | static inline bool kvm_page_empty(void *ptr) |
132 | { | |
133 | struct page *ptr_page = virt_to_page(ptr); | |
134 | return page_count(ptr_page) == 1; | |
135 | } | |
136 | ||
38f791a4 CD |
137 | #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep) |
138 | #define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp) | |
b1d030a7 | 139 | #define kvm_pud_table_empty(kvm, pudp) false |
4f853a71 | 140 | |
b1d030a7 SP |
141 | #define hyp_pte_table_empty(ptep) kvm_page_empty(ptep) |
142 | #define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp) | |
143 | #define hyp_pud_table_empty(pudp) false | |
4f853a71 | 144 | |
c62ee2b2 MZ |
145 | struct kvm; |
146 | ||
15979300 MZ |
147 | #define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l)) |
148 | ||
149 | static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu) | |
150 | { | |
fb32a52a | 151 | return (vcpu_cp15(vcpu, c1_SCTLR) & 0b101) == 0b101; |
15979300 MZ |
152 | } |
153 | ||
ba049e93 DW |
154 | static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu, |
155 | kvm_pfn_t pfn, | |
0d3e4d4f MZ |
156 | unsigned long size, |
157 | bool ipa_uncached) | |
c62ee2b2 MZ |
158 | { |
159 | /* | |
160 | * If we are going to insert an instruction page and the icache is | |
161 | * either VIPT or PIPT, there is a potential problem where the host | |
162 | * (or another VM) may have used the same page as this guest, and we | |
163 | * read incorrect data from the icache. If we're using a PIPT cache, | |
164 | * we can invalidate just that page, but if we are using a VIPT cache | |
165 | * we need to invalidate the entire icache - damn shame - as written | |
166 | * in the ARM ARM (DDI 0406C.b - Page B3-1393). | |
167 | * | |
168 | * VIVT caches are tagged using both the ASID and the VMID and doesn't | |
169 | * need any kind of flushing (DDI 0406C.b - Page B3-1392). | |
0d3e4d4f MZ |
170 | * |
171 | * We need to do this through a kernel mapping (using the | |
172 | * user-space mapping has proved to be the wrong | |
173 | * solution). For that, we need to kmap one page at a time, | |
174 | * and iterate over the range. | |
c62ee2b2 | 175 | */ |
0d3e4d4f MZ |
176 | |
177 | bool need_flush = !vcpu_has_cache_enabled(vcpu) || ipa_uncached; | |
178 | ||
a050dfb2 | 179 | VM_BUG_ON(size & ~PAGE_MASK); |
0d3e4d4f MZ |
180 | |
181 | if (!need_flush && !icache_is_pipt()) | |
182 | goto vipt_cache; | |
183 | ||
184 | while (size) { | |
185 | void *va = kmap_atomic_pfn(pfn); | |
186 | ||
187 | if (need_flush) | |
188 | kvm_flush_dcache_to_poc(va, PAGE_SIZE); | |
189 | ||
190 | if (icache_is_pipt()) | |
191 | __cpuc_coherent_user_range((unsigned long)va, | |
192 | (unsigned long)va + PAGE_SIZE); | |
193 | ||
194 | size -= PAGE_SIZE; | |
195 | pfn++; | |
196 | ||
197 | kunmap_atomic(va); | |
198 | } | |
199 | ||
200 | vipt_cache: | |
201 | if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) { | |
c62ee2b2 MZ |
202 | /* any kind of VIPT cache */ |
203 | __flush_icache_all(); | |
204 | } | |
205 | } | |
206 | ||
363ef89f MZ |
207 | static inline void __kvm_flush_dcache_pte(pte_t pte) |
208 | { | |
209 | void *va = kmap_atomic(pte_page(pte)); | |
210 | ||
211 | kvm_flush_dcache_to_poc(va, PAGE_SIZE); | |
212 | ||
213 | kunmap_atomic(va); | |
214 | } | |
215 | ||
216 | static inline void __kvm_flush_dcache_pmd(pmd_t pmd) | |
217 | { | |
218 | unsigned long size = PMD_SIZE; | |
ba049e93 | 219 | kvm_pfn_t pfn = pmd_pfn(pmd); |
363ef89f MZ |
220 | |
221 | while (size) { | |
222 | void *va = kmap_atomic_pfn(pfn); | |
223 | ||
224 | kvm_flush_dcache_to_poc(va, PAGE_SIZE); | |
225 | ||
226 | pfn++; | |
227 | size -= PAGE_SIZE; | |
228 | ||
229 | kunmap_atomic(va); | |
230 | } | |
231 | } | |
232 | ||
233 | static inline void __kvm_flush_dcache_pud(pud_t pud) | |
234 | { | |
235 | } | |
236 | ||
4fda342c | 237 | #define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x)) |
5a677ce0 | 238 | |
3c1e7165 MZ |
239 | void kvm_set_way_flush(struct kvm_vcpu *vcpu); |
240 | void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled); | |
9d218a1f | 241 | |
e4c5a685 AB |
242 | static inline bool __kvm_cpu_uses_extended_idmap(void) |
243 | { | |
244 | return false; | |
245 | } | |
246 | ||
247 | static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd, | |
248 | pgd_t *hyp_pgd, | |
249 | pgd_t *merged_hyp_pgd, | |
250 | unsigned long hyp_idmap_start) { } | |
251 | ||
20475f78 VM |
252 | static inline unsigned int kvm_get_vmid_bits(void) |
253 | { | |
254 | return 8; | |
255 | } | |
256 | ||
5a677ce0 MZ |
257 | #endif /* !__ASSEMBLY__ */ |
258 | ||
342cd0ab | 259 | #endif /* __ARM_KVM_MMU_H__ */ |