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>
51 int create_hyp_mappings(void *from, void *to);
52 int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
53 void free_boot_hyp_pgd(void);
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_mmu_get_boot_httbr(void);
68 phys_addr_t kvm_get_idmap_vector(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 void kvm_set_s2pte_writable(pte_t *pte)
110 pte_val(*pte) |= L_PTE_S2_RDWR;
113 static inline void kvm_set_s2pmd_writable(pmd_t *pmd)
115 pmd_val(*pmd) |= L_PMD_S2_RDWR;
118 /* Open coded p*d_addr_end that can deal with 64bit addresses */
119 #define kvm_pgd_addr_end(addr, end) \
120 ({ u64 __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
121 (__boundary - 1 < (end) - 1)? __boundary: (end); \
124 #define kvm_pud_addr_end(addr,end) (end)
126 #define kvm_pmd_addr_end(addr, end) \
127 ({ u64 __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
128 (__boundary - 1 < (end) - 1)? __boundary: (end); \
131 static inline bool kvm_page_empty(void *ptr)
133 struct page *ptr_page = virt_to_page(ptr);
134 return page_count(ptr_page) == 1;
138 #define kvm_pte_table_empty(kvm, ptep) kvm_page_empty(ptep)
139 #define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
140 #define kvm_pud_table_empty(kvm, pudp) (0)
142 #define KVM_PREALLOC_LEVEL 0
144 static inline int kvm_prealloc_hwpgd(struct kvm *kvm, pgd_t *pgd)
149 static inline void kvm_free_hwpgd(struct kvm *kvm) { }
151 static inline void *kvm_get_hwpgd(struct kvm *kvm)
153 return kvm->arch.pgd;
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->arch.cp15[c1_SCTLR] & 0b101) == 0b101;
165 static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu, pfn_t pfn,
170 * If we are going to insert an instruction page and the icache is
171 * either VIPT or PIPT, there is a potential problem where the host
172 * (or another VM) may have used the same page as this guest, and we
173 * read incorrect data from the icache. If we're using a PIPT cache,
174 * we can invalidate just that page, but if we are using a VIPT cache
175 * we need to invalidate the entire icache - damn shame - as written
176 * in the ARM ARM (DDI 0406C.b - Page B3-1393).
178 * VIVT caches are tagged using both the ASID and the VMID and doesn't
179 * need any kind of flushing (DDI 0406C.b - Page B3-1392).
181 * We need to do this through a kernel mapping (using the
182 * user-space mapping has proved to be the wrong
183 * solution). For that, we need to kmap one page at a time,
184 * and iterate over the range.
187 bool need_flush = !vcpu_has_cache_enabled(vcpu) || ipa_uncached;
189 VM_BUG_ON(size & PAGE_MASK);
191 if (!need_flush && !icache_is_pipt())
195 void *va = kmap_atomic_pfn(pfn);
198 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
200 if (icache_is_pipt())
201 __cpuc_coherent_user_range((unsigned long)va,
202 (unsigned long)va + PAGE_SIZE);
211 if (!icache_is_pipt() && !icache_is_vivt_asid_tagged()) {
212 /* any kind of VIPT cache */
213 __flush_icache_all();
217 static inline void __kvm_flush_dcache_pte(pte_t pte)
219 void *va = kmap_atomic(pte_page(pte));
221 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
226 static inline void __kvm_flush_dcache_pmd(pmd_t pmd)
228 unsigned long size = PMD_SIZE;
229 pfn_t pfn = pmd_pfn(pmd);
232 void *va = kmap_atomic_pfn(pfn);
234 kvm_flush_dcache_to_poc(va, PAGE_SIZE);
243 static inline void __kvm_flush_dcache_pud(pud_t pud)
247 #define kvm_virt_to_phys(x) virt_to_idmap((unsigned long)(x))
249 void kvm_set_way_flush(struct kvm_vcpu *vcpu);
250 void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled);
252 #endif /* !__ASSEMBLY__ */
254 #endif /* __ARM_KVM_MMU_H__ */