2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
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.
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.
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.
19 #ifndef __ARM_KVM_MMU_H__
20 #define __ARM_KVM_MMU_H__
22 #include <asm/memory.h>
26 * We directly use the kernel VA for the HYP, as we can directly share
27 * the mapping (HTTBR "covers" TTBR1).
29 #define HYP_PAGE_OFFSET_MASK UL(~0)
30 #define HYP_PAGE_OFFSET PAGE_OFFSET
31 #define KERN_TO_HYP(kva) (kva)
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.
38 #define TRAMPOLINE_VA UL(CONFIG_VECTORS_BASE)
41 * KVM_MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels.
43 #define KVM_MMU_CACHE_MIN_PAGES 2
47 #include <linux/highmem.h>
48 #include <asm/cacheflush.h>
49 #include <asm/pgalloc.h>
50 #include <asm/stage2_pgtable.h>
52 int create_hyp_mappings(void *from
, void *to
);
53 int create_hyp_io_mappings(void *from
, void *to
, phys_addr_t
);
54 void free_boot_hyp_pgd(void);
55 void free_hyp_pgds(void);
57 void stage2_unmap_vm(struct kvm
*kvm
);
58 int kvm_alloc_stage2_pgd(struct kvm
*kvm
);
59 void kvm_free_stage2_pgd(struct kvm
*kvm
);
60 int kvm_phys_addr_ioremap(struct kvm
*kvm
, phys_addr_t guest_ipa
,
61 phys_addr_t pa
, unsigned long size
, bool writable
);
63 int kvm_handle_guest_abort(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
);
65 void kvm_mmu_free_memory_caches(struct kvm_vcpu
*vcpu
);
67 phys_addr_t
kvm_mmu_get_httbr(void);
68 phys_addr_t
kvm_mmu_get_boot_httbr(void);
69 phys_addr_t
kvm_get_idmap_vector(void);
70 phys_addr_t
kvm_get_idmap_start(void);
71 int kvm_mmu_init(void);
72 void kvm_clear_hyp_idmap(void);
74 static inline void kvm_set_pmd(pmd_t
*pmd
, pmd_t new_pmd
)
80 static inline void kvm_set_pte(pte_t
*pte
, pte_t new_pte
)
84 * flush_pmd_entry just takes a void pointer and cleans the necessary
85 * cache entries, so we can reuse the function for ptes.
90 static inline void kvm_clean_pgd(pgd_t
*pgd
)
92 clean_dcache_area(pgd
, PTRS_PER_S2_PGD
* sizeof(pgd_t
));
95 static inline void kvm_clean_pmd(pmd_t
*pmd
)
97 clean_dcache_area(pmd
, PTRS_PER_PMD
* sizeof(pmd_t
));
100 static inline void kvm_clean_pmd_entry(pmd_t
*pmd
)
102 clean_pmd_entry(pmd
);
105 static inline void kvm_clean_pte(pte_t
*pte
)
107 clean_pte_table(pte
);
110 static inline pte_t
kvm_s2pte_mkwrite(pte_t pte
)
112 pte_val(pte
) |= L_PTE_S2_RDWR
;
116 static inline pmd_t
kvm_s2pmd_mkwrite(pmd_t pmd
)
118 pmd_val(pmd
) |= L_PMD_S2_RDWR
;
122 static inline void kvm_set_s2pte_readonly(pte_t
*pte
)
124 pte_val(*pte
) = (pte_val(*pte
) & ~L_PTE_S2_RDWR
) | L_PTE_S2_RDONLY
;
127 static inline bool kvm_s2pte_readonly(pte_t
*pte
)
129 return (pte_val(*pte
) & L_PTE_S2_RDWR
) == L_PTE_S2_RDONLY
;
132 static inline void kvm_set_s2pmd_readonly(pmd_t
*pmd
)
134 pmd_val(*pmd
) = (pmd_val(*pmd
) & ~L_PMD_S2_RDWR
) | L_PMD_S2_RDONLY
;
137 static inline bool kvm_s2pmd_readonly(pmd_t
*pmd
)
139 return (pmd_val(*pmd
) & L_PMD_S2_RDWR
) == L_PMD_S2_RDONLY
;
142 static inline bool kvm_page_empty(void *ptr
)
144 struct page
*ptr_page
= virt_to_page(ptr
);
145 return page_count(ptr_page
) == 1;
148 #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
149 #define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
150 #define kvm_pud_table_empty(kvm, pudp) false
152 #define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
153 #define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
154 #define hyp_pud_table_empty(pudp) false
158 #define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
160 static inline bool vcpu_has_cache_enabled(struct kvm_vcpu
*vcpu
)
162 return (vcpu_cp15(vcpu
, c1_SCTLR
) & 0b101) == 0b101;
165 static inline void __coherent_cache_guest_page(struct kvm_vcpu
*vcpu
,
171 * If we are going to insert an instruction page and the icache is
172 * either VIPT or PIPT, there is a potential problem where the host
173 * (or another VM) may have used the same page as this guest, and we
174 * read incorrect data from the icache. If we're using a PIPT cache,
175 * we can invalidate just that page, but if we are using a VIPT cache
176 * we need to invalidate the entire icache - damn shame - as written
177 * in the ARM ARM (DDI 0406C.b - Page B3-1393).
179 * VIVT caches are tagged using both the ASID and the VMID and doesn't
180 * need any kind of flushing (DDI 0406C.b - Page B3-1392).
182 * We need to do this through a kernel mapping (using the
183 * user-space mapping has proved to be the wrong
184 * solution). For that, we need to kmap one page at a time,
185 * and iterate over the range.
188 bool need_flush
= !vcpu_has_cache_enabled(vcpu
) || ipa_uncached
;
190 VM_BUG_ON(size
& ~PAGE_MASK
);
192 if (!need_flush
&& !icache_is_pipt())
196 void *va
= kmap_atomic_pfn(pfn
);
199 kvm_flush_dcache_to_poc(va
, PAGE_SIZE
);
201 if (icache_is_pipt())
202 __cpuc_coherent_user_range((unsigned long)va
,
203 (unsigned long)va
+ PAGE_SIZE
);
212 if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) {
213 /* any kind of VIPT cache */
214 __flush_icache_all();
218 static inline void __kvm_flush_dcache_pte(pte_t pte
)
220 void *va
= kmap_atomic(pte_page(pte
));
222 kvm_flush_dcache_to_poc(va
, PAGE_SIZE
);
227 static inline void __kvm_flush_dcache_pmd(pmd_t pmd
)
229 unsigned long size
= PMD_SIZE
;
230 kvm_pfn_t pfn
= pmd_pfn(pmd
);
233 void *va
= kmap_atomic_pfn(pfn
);
235 kvm_flush_dcache_to_poc(va
, PAGE_SIZE
);
244 static inline void __kvm_flush_dcache_pud(pud_t pud
)
248 #define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x))
250 void kvm_set_way_flush(struct kvm_vcpu
*vcpu
);
251 void kvm_toggle_cache(struct kvm_vcpu
*vcpu
, bool was_enabled
);
253 static inline bool __kvm_cpu_uses_extended_idmap(void)
258 static inline void __kvm_extend_hypmap(pgd_t
*boot_hyp_pgd
,
260 pgd_t
*merged_hyp_pgd
,
261 unsigned long hyp_idmap_start
) { }
263 static inline unsigned int kvm_get_vmid_bits(void)
268 #endif /* !__ASSEMBLY__ */
270 #endif /* __ARM_KVM_MMU_H__ */
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