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, pgprot_t prot);
53 int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
54 void free_hyp_pgds(void);
56 void stage2_unmap_vm(struct kvm *kvm);
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,
60 phys_addr_t pa, unsigned long size, bool writable);
62 int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run);
64 void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu);
66 phys_addr_t kvm_mmu_get_httbr(void);
67 phys_addr_t kvm_get_idmap_vector(void);
68 phys_addr_t kvm_get_idmap_start(void);
69 int kvm_mmu_init(void);
70 void kvm_clear_hyp_idmap(void);
72 static inline void kvm_set_pmd(pmd_t *pmd, pmd_t new_pmd)
78 static inline void kvm_set_pte(pte_t *pte, pte_t new_pte)
82 * flush_pmd_entry just takes a void pointer and cleans the necessary
83 * cache entries, so we can reuse the function for ptes.
88 static inline void kvm_clean_pgd(pgd_t *pgd)
90 clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t));
93 static inline void kvm_clean_pmd(pmd_t *pmd)
95 clean_dcache_area(pmd, PTRS_PER_PMD * sizeof(pmd_t));
98 static inline void kvm_clean_pmd_entry(pmd_t *pmd)
100 clean_pmd_entry(pmd);
103 static inline void kvm_clean_pte(pte_t *pte)
105 clean_pte_table(pte);
108 static inline pte_t kvm_s2pte_mkwrite(pte_t pte)
110 pte_val(pte) |= L_PTE_S2_RDWR;
114 static inline pmd_t kvm_s2pmd_mkwrite(pmd_t pmd)
116 pmd_val(pmd) |= L_PMD_S2_RDWR;
120 static inline void kvm_set_s2pte_readonly(pte_t *pte)
122 pte_val(*pte) = (pte_val(*pte) & ~L_PTE_S2_RDWR) | L_PTE_S2_RDONLY;
125 static inline bool kvm_s2pte_readonly(pte_t *pte)
127 return (pte_val(*pte) & L_PTE_S2_RDWR) == L_PTE_S2_RDONLY;
130 static inline void kvm_set_s2pmd_readonly(pmd_t *pmd)
132 pmd_val(*pmd) = (pmd_val(*pmd) & ~L_PMD_S2_RDWR) | L_PMD_S2_RDONLY;
135 static inline bool kvm_s2pmd_readonly(pmd_t *pmd)
137 return (pmd_val(*pmd) & L_PMD_S2_RDWR) == L_PMD_S2_RDONLY;
140 static inline bool kvm_page_empty(void *ptr)
142 struct page *ptr_page = virt_to_page(ptr);
143 return page_count(ptr_page) == 1;
146 #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
147 #define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
148 #define kvm_pud_table_empty(kvm, pudp) false
150 #define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
151 #define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
152 #define hyp_pud_table_empty(pudp) false
156 #define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
158 static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
160 return (vcpu_cp15(vcpu, c1_SCTLR) & 0b101) == 0b101;
163 static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu,
169 * If we are going to insert an instruction page and the icache is
170 * either VIPT or PIPT, there is a potential problem where the host
171 * (or another VM) may have used the same page as this guest, and we
172 * read incorrect data from the icache. If we're using a PIPT cache,
173 * we can invalidate just that page, but if we are using a VIPT cache
174 * we need to invalidate the entire icache - damn shame - as written
175 * in the ARM ARM (DDI 0406C.b - Page B3-1393).
177 * VIVT caches are tagged using both the ASID and the VMID and doesn't
178 * need any kind of flushing (DDI 0406C.b - Page B3-1392).
180 * We need to do this through a kernel mapping (using the
181 * user-space mapping has proved to be the wrong
182 * solution). For that, we need to kmap one page at a time,
183 * and iterate over the range.
186 bool need_flush = !vcpu_has_cache_enabled(vcpu) || ipa_uncached;
188 VM_BUG_ON(size & ~PAGE_MASK);
190 if (!need_flush && !icache_is_pipt())
194 void *va = kmap_atomic_pfn(pfn);
197 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
199 if (icache_is_pipt())
200 __cpuc_coherent_user_range((unsigned long)va,
201 (unsigned long)va + PAGE_SIZE);
210 if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) {
211 /* any kind of VIPT cache */
212 __flush_icache_all();
216 static inline void __kvm_flush_dcache_pte(pte_t pte)
218 void *va = kmap_atomic(pte_page(pte));
220 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
225 static inline void __kvm_flush_dcache_pmd(pmd_t pmd)
227 unsigned long size = PMD_SIZE;
228 kvm_pfn_t pfn = pmd_pfn(pmd);
231 void *va = kmap_atomic_pfn(pfn);
233 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
242 static inline void __kvm_flush_dcache_pud(pud_t pud)
246 #define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x))
248 void kvm_set_way_flush(struct kvm_vcpu *vcpu);
249 void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
251 static inline bool __kvm_cpu_uses_extended_idmap(void)
256 static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd,
258 pgd_t *merged_hyp_pgd,
259 unsigned long hyp_idmap_start) { }
261 static inline unsigned int kvm_get_vmid_bits(void)
266 #endif /* !__ASSEMBLY__ */
268 #endif /* __ARM_KVM_MMU_H__ */