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Linux/arch/arm/include/asm/kvm_mmu.h

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  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 
 22 #include <asm/memory.h>
 23 #include <asm/page.h>
 24 
 25 /*
 26  * We directly use the kernel VA for the HYP, as we can directly share
 27  * the mapping (HTTBR "covers" TTBR1).
 28  */
 29 #define kern_hyp_va(kva)        (kva)
 30 
 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 
 36 #ifndef __ASSEMBLY__
 37 
 38 #include <linux/highmem.h>
 39 #include <asm/cacheflush.h>
 40 #include <asm/pgalloc.h>
 41 #include <asm/stage2_pgtable.h>
 42 
 43 int create_hyp_mappings(void *from, void *to, pgprot_t prot);
 44 int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
 45 void free_hyp_pgds(void);
 46 
 47 void stage2_unmap_vm(struct kvm *kvm);
 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,
 51                           phys_addr_t pa, unsigned long size, bool writable);
 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 
 57 phys_addr_t kvm_mmu_get_httbr(void);
 58 phys_addr_t kvm_get_idmap_vector(void);
 59 phys_addr_t kvm_get_idmap_start(void);
 60 int kvm_mmu_init(void);
 61 void kvm_clear_hyp_idmap(void);
 62 
 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 
 69 static inline void kvm_set_pte(pte_t *pte, pte_t new_pte)
 70 {
 71         *pte = new_pte;
 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 
 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 
 84 static inline void kvm_clean_pmd(pmd_t *pmd)
 85 {
 86         clean_dcache_area(pmd, PTRS_PER_PMD * sizeof(pmd_t));
 87 }
 88 
 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 
 99 static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
100 {
101         pte_val(pte) |= L_PTE_S2_RDWR;
102         return pte;
103 }
104 
105 static inline pmd_t kvm_s2pmd_mkwrite(pmd_t pmd)
106 {
107         pmd_val(pmd) |= L_PMD_S2_RDWR;
108         return pmd;
109 }
110 
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 
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 
137 #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
138 #define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
139 #define kvm_pud_table_empty(kvm, pudp) false
140 
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
144 
145 struct kvm;
146 
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 {
151         return (vcpu_cp15(vcpu, c1_SCTLR) & 0b101) == 0b101;
152 }
153 
154 static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
155                                                kvm_pfn_t pfn,
156                                                unsigned long size,
157                                                bool ipa_uncached)
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).
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.
175          */
176 
177         bool need_flush = !vcpu_has_cache_enabled(vcpu) || ipa_uncached;
178 
179         VM_BUG_ON(size & ~PAGE_MASK);
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()) {
202                 /* any kind of VIPT cache */
203                 __flush_icache_all();
204         }
205 }
206 
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;
219         kvm_pfn_t pfn = pmd_pfn(pmd);
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 
237 #define kvm_virt_to_phys(x)             virt_to_idmap((unsigned long)(x))
238 
239 void kvm_set_way_flush(struct kvm_vcpu *vcpu);
240 void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
241 
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 
252 static inline unsigned int kvm_get_vmid_bits(void)
253 {
254         return 8;
255 }
256 
257 #endif  /* !__ASSEMBLY__ */
258 
259 #endif /* __ARM_KVM_MMU_H__ */
260 

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