Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012,2013 - ARM Ltd |
| 3 | * Author: Marc Zyngier <marc.zyngier@arm.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, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #ifndef __ARM64_KVM_MMU_H__ |
| 19 | #define __ARM64_KVM_MMU_H__ |
| 20 | |
| 21 | #include <asm/page.h> |
| 22 | #include <asm/memory.h> |
Vladimir Murzin | 20475f7 | 2015-11-16 11:28:18 +0000 | [diff] [blame] | 23 | #include <asm/cpufeature.h> |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 24 | |
| 25 | /* |
Marc Zyngier | cedbb8b7 | 2015-01-29 13:50:34 +0000 | [diff] [blame] | 26 | * As ARMv8.0 only has the TTBR0_EL2 register, we cannot express |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 27 | * "negative" addresses. This makes it impossible to directly share |
| 28 | * mappings with the kernel. |
| 29 | * |
| 30 | * Instead, give the HYP mode its own VA region at a fixed offset from |
| 31 | * the kernel by just masking the top bits (which are all ones for a |
| 32 | * kernel address). |
Marc Zyngier | cedbb8b7 | 2015-01-29 13:50:34 +0000 | [diff] [blame] | 33 | * |
| 34 | * ARMv8.1 (using VHE) does have a TTBR1_EL2, and doesn't use these |
| 35 | * macros (the entire kernel runs at EL2). |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 36 | */ |
| 37 | #define HYP_PAGE_OFFSET_SHIFT VA_BITS |
| 38 | #define HYP_PAGE_OFFSET_MASK ((UL(1) << HYP_PAGE_OFFSET_SHIFT) - 1) |
| 39 | #define HYP_PAGE_OFFSET (PAGE_OFFSET & HYP_PAGE_OFFSET_MASK) |
| 40 | |
| 41 | /* |
| 42 | * Our virtual mapping for the idmap-ed MMU-enable code. Must be |
| 43 | * shared across all the page-tables. Conveniently, we use the last |
| 44 | * possible page, where no kernel mapping will ever exist. |
| 45 | */ |
| 46 | #define TRAMPOLINE_VA (HYP_PAGE_OFFSET_MASK & PAGE_MASK) |
| 47 | |
| 48 | #ifdef __ASSEMBLY__ |
| 49 | |
Marc Zyngier | cedbb8b7 | 2015-01-29 13:50:34 +0000 | [diff] [blame] | 50 | #include <asm/alternative.h> |
| 51 | #include <asm/cpufeature.h> |
| 52 | |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 53 | /* |
| 54 | * Convert a kernel VA into a HYP VA. |
| 55 | * reg: VA to be converted. |
| 56 | */ |
| 57 | .macro kern_hyp_va reg |
Marc Zyngier | cedbb8b7 | 2015-01-29 13:50:34 +0000 | [diff] [blame] | 58 | alternative_if_not ARM64_HAS_VIRT_HOST_EXTN |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 59 | and \reg, \reg, #HYP_PAGE_OFFSET_MASK |
Marc Zyngier | cedbb8b7 | 2015-01-29 13:50:34 +0000 | [diff] [blame] | 60 | alternative_else |
| 61 | nop |
| 62 | alternative_endif |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 63 | .endm |
| 64 | |
| 65 | #else |
| 66 | |
Christoffer Dall | 38f791a | 2014-10-10 12:14:28 +0200 | [diff] [blame] | 67 | #include <asm/pgalloc.h> |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 68 | #include <asm/cachetype.h> |
| 69 | #include <asm/cacheflush.h> |
Ard Biesheuvel | e4c5a68 | 2015-03-19 16:42:28 +0000 | [diff] [blame] | 70 | #include <asm/mmu_context.h> |
| 71 | #include <asm/pgtable.h> |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 72 | |
| 73 | #define KERN_TO_HYP(kva) ((unsigned long)kva - PAGE_OFFSET + HYP_PAGE_OFFSET) |
| 74 | |
| 75 | /* |
Joel Schopp | dbff124 | 2014-07-09 11:17:04 -0500 | [diff] [blame] | 76 | * We currently only support a 40bit IPA. |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 77 | */ |
Joel Schopp | dbff124 | 2014-07-09 11:17:04 -0500 | [diff] [blame] | 78 | #define KVM_PHYS_SHIFT (40) |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 79 | #define KVM_PHYS_SIZE (1UL << KVM_PHYS_SHIFT) |
| 80 | #define KVM_PHYS_MASK (KVM_PHYS_SIZE - 1UL) |
| 81 | |
Suzuki K Poulose | c0ef632 | 2016-03-22 14:16:52 +0000 | [diff] [blame] | 82 | #include <asm/stage2_pgtable.h> |
| 83 | |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 84 | int create_hyp_mappings(void *from, void *to); |
| 85 | int create_hyp_io_mappings(void *from, void *to, phys_addr_t); |
| 86 | void free_boot_hyp_pgd(void); |
| 87 | void free_hyp_pgds(void); |
| 88 | |
Christoffer Dall | 957db10 | 2014-11-27 10:35:03 +0100 | [diff] [blame] | 89 | void stage2_unmap_vm(struct kvm *kvm); |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 90 | int kvm_alloc_stage2_pgd(struct kvm *kvm); |
| 91 | void kvm_free_stage2_pgd(struct kvm *kvm); |
| 92 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, |
Ard Biesheuvel | c40f2f8 | 2014-09-17 14:56:18 -0700 | [diff] [blame] | 93 | phys_addr_t pa, unsigned long size, bool writable); |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 94 | |
| 95 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run); |
| 96 | |
| 97 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu); |
| 98 | |
| 99 | phys_addr_t kvm_mmu_get_httbr(void); |
| 100 | phys_addr_t kvm_mmu_get_boot_httbr(void); |
| 101 | phys_addr_t kvm_get_idmap_vector(void); |
| 102 | int kvm_mmu_init(void); |
| 103 | void kvm_clear_hyp_idmap(void); |
| 104 | |
| 105 | #define kvm_set_pte(ptep, pte) set_pte(ptep, pte) |
Christoffer Dall | ad361f0 | 2012-11-01 17:14:45 +0100 | [diff] [blame] | 106 | #define kvm_set_pmd(pmdp, pmd) set_pmd(pmdp, pmd) |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 107 | |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 108 | static inline void kvm_clean_pgd(pgd_t *pgd) {} |
Christoffer Dall | 38f791a | 2014-10-10 12:14:28 +0200 | [diff] [blame] | 109 | static inline void kvm_clean_pmd(pmd_t *pmd) {} |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 110 | static inline void kvm_clean_pmd_entry(pmd_t *pmd) {} |
| 111 | static inline void kvm_clean_pte(pte_t *pte) {} |
| 112 | static inline void kvm_clean_pte_entry(pte_t *pte) {} |
| 113 | |
| 114 | static inline void kvm_set_s2pte_writable(pte_t *pte) |
| 115 | { |
| 116 | pte_val(*pte) |= PTE_S2_RDWR; |
| 117 | } |
| 118 | |
Christoffer Dall | ad361f0 | 2012-11-01 17:14:45 +0100 | [diff] [blame] | 119 | static inline void kvm_set_s2pmd_writable(pmd_t *pmd) |
| 120 | { |
| 121 | pmd_val(*pmd) |= PMD_S2_RDWR; |
| 122 | } |
| 123 | |
Mario Smarduch | 8199ed0 | 2015-01-15 15:58:59 -0800 | [diff] [blame] | 124 | static inline void kvm_set_s2pte_readonly(pte_t *pte) |
| 125 | { |
| 126 | pte_val(*pte) = (pte_val(*pte) & ~PTE_S2_RDWR) | PTE_S2_RDONLY; |
| 127 | } |
| 128 | |
| 129 | static inline bool kvm_s2pte_readonly(pte_t *pte) |
| 130 | { |
| 131 | return (pte_val(*pte) & PTE_S2_RDWR) == PTE_S2_RDONLY; |
| 132 | } |
| 133 | |
| 134 | static inline void kvm_set_s2pmd_readonly(pmd_t *pmd) |
| 135 | { |
| 136 | pmd_val(*pmd) = (pmd_val(*pmd) & ~PMD_S2_RDWR) | PMD_S2_RDONLY; |
| 137 | } |
| 138 | |
| 139 | static inline bool kvm_s2pmd_readonly(pmd_t *pmd) |
| 140 | { |
| 141 | return (pmd_val(*pmd) & PMD_S2_RDWR) == PMD_S2_RDONLY; |
| 142 | } |
| 143 | |
Christoffer Dall | 4f853a7 | 2014-05-09 23:31:31 +0200 | [diff] [blame] | 144 | static inline bool kvm_page_empty(void *ptr) |
| 145 | { |
| 146 | struct page *ptr_page = virt_to_page(ptr); |
| 147 | return page_count(ptr_page) == 1; |
| 148 | } |
| 149 | |
Suzuki K Poulose | 66f877fa | 2016-03-22 17:20:28 +0000 | [diff] [blame] | 150 | #define hyp_pte_table_empty(ptep) kvm_page_empty(ptep) |
| 151 | |
| 152 | #ifdef __PAGETABLE_PMD_FOLDED |
| 153 | #define hyp_pmd_table_empty(pmdp) (0) |
| 154 | #else |
| 155 | #define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp) |
| 156 | #endif |
| 157 | |
| 158 | #ifdef __PAGETABLE_PUD_FOLDED |
| 159 | #define hyp_pud_table_empty(pudp) (0) |
| 160 | #else |
| 161 | #define hyp_pud_table_empty(pudp) kvm_page_empty(pudp) |
| 162 | #endif |
| 163 | |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 164 | struct kvm; |
| 165 | |
Marc Zyngier | 2d58b73 | 2014-01-14 19:13:10 +0000 | [diff] [blame] | 166 | #define kvm_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l)) |
| 167 | |
| 168 | static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu) |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 169 | { |
Marc Zyngier | 2d58b73 | 2014-01-14 19:13:10 +0000 | [diff] [blame] | 170 | return (vcpu_sys_reg(vcpu, SCTLR_EL1) & 0b101) == 0b101; |
| 171 | } |
| 172 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 173 | static inline void __coherent_cache_guest_page(struct kvm_vcpu *vcpu, |
| 174 | kvm_pfn_t pfn, |
Marc Zyngier | 0d3e4d4 | 2015-01-05 21:13:24 +0000 | [diff] [blame] | 175 | unsigned long size, |
| 176 | bool ipa_uncached) |
Marc Zyngier | 2d58b73 | 2014-01-14 19:13:10 +0000 | [diff] [blame] | 177 | { |
Marc Zyngier | 0d3e4d4 | 2015-01-05 21:13:24 +0000 | [diff] [blame] | 178 | void *va = page_address(pfn_to_page(pfn)); |
| 179 | |
Laszlo Ersek | 840f4bf | 2014-11-17 14:58:52 +0000 | [diff] [blame] | 180 | if (!vcpu_has_cache_enabled(vcpu) || ipa_uncached) |
Marc Zyngier | 0d3e4d4 | 2015-01-05 21:13:24 +0000 | [diff] [blame] | 181 | kvm_flush_dcache_to_poc(va, size); |
Marc Zyngier | 2d58b73 | 2014-01-14 19:13:10 +0000 | [diff] [blame] | 182 | |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 183 | if (!icache_is_aliasing()) { /* PIPT */ |
Marc Zyngier | 0d3e4d4 | 2015-01-05 21:13:24 +0000 | [diff] [blame] | 184 | flush_icache_range((unsigned long)va, |
| 185 | (unsigned long)va + size); |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 186 | } else if (!icache_is_aivivt()) { /* non ASID-tagged VIVT */ |
| 187 | /* any kind of VIPT cache */ |
| 188 | __flush_icache_all(); |
| 189 | } |
| 190 | } |
| 191 | |
Marc Zyngier | 363ef89 | 2014-12-19 16:48:06 +0000 | [diff] [blame] | 192 | static inline void __kvm_flush_dcache_pte(pte_t pte) |
| 193 | { |
| 194 | struct page *page = pte_page(pte); |
| 195 | kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE); |
| 196 | } |
| 197 | |
| 198 | static inline void __kvm_flush_dcache_pmd(pmd_t pmd) |
| 199 | { |
| 200 | struct page *page = pmd_page(pmd); |
| 201 | kvm_flush_dcache_to_poc(page_address(page), PMD_SIZE); |
| 202 | } |
| 203 | |
| 204 | static inline void __kvm_flush_dcache_pud(pud_t pud) |
| 205 | { |
| 206 | struct page *page = pud_page(pud); |
| 207 | kvm_flush_dcache_to_poc(page_address(page), PUD_SIZE); |
| 208 | } |
| 209 | |
Santosh Shilimkar | 4fda342 | 2013-11-19 14:59:12 -0500 | [diff] [blame] | 210 | #define kvm_virt_to_phys(x) __virt_to_phys((unsigned long)(x)) |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 211 | |
Marc Zyngier | 3c1e716 | 2014-12-19 16:05:31 +0000 | [diff] [blame] | 212 | void kvm_set_way_flush(struct kvm_vcpu *vcpu); |
| 213 | void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled); |
Marc Zyngier | 9d218a1 | 2014-01-15 12:50:23 +0000 | [diff] [blame] | 214 | |
Ard Biesheuvel | e4c5a68 | 2015-03-19 16:42:28 +0000 | [diff] [blame] | 215 | static inline bool __kvm_cpu_uses_extended_idmap(void) |
| 216 | { |
| 217 | return __cpu_uses_extended_idmap(); |
| 218 | } |
| 219 | |
| 220 | static inline void __kvm_extend_hypmap(pgd_t *boot_hyp_pgd, |
| 221 | pgd_t *hyp_pgd, |
| 222 | pgd_t *merged_hyp_pgd, |
| 223 | unsigned long hyp_idmap_start) |
| 224 | { |
| 225 | int idmap_idx; |
| 226 | |
| 227 | /* |
| 228 | * Use the first entry to access the HYP mappings. It is |
| 229 | * guaranteed to be free, otherwise we wouldn't use an |
| 230 | * extended idmap. |
| 231 | */ |
| 232 | VM_BUG_ON(pgd_val(merged_hyp_pgd[0])); |
| 233 | merged_hyp_pgd[0] = __pgd(__pa(hyp_pgd) | PMD_TYPE_TABLE); |
| 234 | |
| 235 | /* |
| 236 | * Create another extended level entry that points to the boot HYP map, |
| 237 | * which contains an ID mapping of the HYP init code. We essentially |
| 238 | * merge the boot and runtime HYP maps by doing so, but they don't |
| 239 | * overlap anyway, so this is fine. |
| 240 | */ |
| 241 | idmap_idx = hyp_idmap_start >> VA_BITS; |
| 242 | VM_BUG_ON(pgd_val(merged_hyp_pgd[idmap_idx])); |
| 243 | merged_hyp_pgd[idmap_idx] = __pgd(__pa(boot_hyp_pgd) | PMD_TYPE_TABLE); |
| 244 | } |
| 245 | |
Vladimir Murzin | 20475f7 | 2015-11-16 11:28:18 +0000 | [diff] [blame] | 246 | static inline unsigned int kvm_get_vmid_bits(void) |
| 247 | { |
| 248 | int reg = read_system_reg(SYS_ID_AA64MMFR1_EL1); |
| 249 | |
Suzuki K Poulose | 28c5dcb | 2016-01-26 10:58:16 +0000 | [diff] [blame] | 250 | return (cpuid_feature_extract_unsigned_field(reg, ID_AA64MMFR1_VMIDBITS_SHIFT) == 2) ? 16 : 8; |
Vladimir Murzin | 20475f7 | 2015-11-16 11:28:18 +0000 | [diff] [blame] | 251 | } |
| 252 | |
Marc Zyngier | 37c4375 | 2012-12-10 15:35:24 +0000 | [diff] [blame] | 253 | #endif /* __ASSEMBLY__ */ |
| 254 | #endif /* __ARM64_KVM_MMU_H__ */ |