Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Kernel-based Virtual Machine driver for Linux |
| 3 | * |
| 4 | * This module enables machines with Intel VT-x extensions to run virtual |
| 5 | * machines without emulation or binary translation. |
| 6 | * |
| 7 | * MMU support |
| 8 | * |
| 9 | * Copyright (C) 2006 Qumranet, Inc. |
| 10 | * |
| 11 | * Authors: |
| 12 | * Yaniv Kamay <yaniv@qumranet.com> |
| 13 | * Avi Kivity <avi@qumranet.com> |
| 14 | * |
| 15 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 16 | * the COPYING file in the top-level directory. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | * We need the mmu code to access both 32-bit and 64-bit guest ptes, |
| 22 | * so the code in this file is compiled twice, once per pte size. |
| 23 | */ |
| 24 | |
| 25 | #if PTTYPE == 64 |
| 26 | #define pt_element_t u64 |
| 27 | #define guest_walker guest_walker64 |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 28 | #define shadow_walker shadow_walker64 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 29 | #define FNAME(name) paging##64_##name |
| 30 | #define PT_BASE_ADDR_MASK PT64_BASE_ADDR_MASK |
| 31 | #define PT_DIR_BASE_ADDR_MASK PT64_DIR_BASE_ADDR_MASK |
| 32 | #define PT_INDEX(addr, level) PT64_INDEX(addr, level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 33 | #define PT_LEVEL_MASK(level) PT64_LEVEL_MASK(level) |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 34 | #define PT_LEVEL_BITS PT64_LEVEL_BITS |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 35 | #ifdef CONFIG_X86_64 |
| 36 | #define PT_MAX_FULL_LEVELS 4 |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 37 | #define CMPXCHG cmpxchg |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 38 | #else |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 39 | #define CMPXCHG cmpxchg64 |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 40 | #define PT_MAX_FULL_LEVELS 2 |
| 41 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 42 | #elif PTTYPE == 32 |
| 43 | #define pt_element_t u32 |
| 44 | #define guest_walker guest_walker32 |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 45 | #define shadow_walker shadow_walker32 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 46 | #define FNAME(name) paging##32_##name |
| 47 | #define PT_BASE_ADDR_MASK PT32_BASE_ADDR_MASK |
| 48 | #define PT_DIR_BASE_ADDR_MASK PT32_DIR_BASE_ADDR_MASK |
| 49 | #define PT_INDEX(addr, level) PT32_INDEX(addr, level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 50 | #define PT_LEVEL_MASK(level) PT32_LEVEL_MASK(level) |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 51 | #define PT_LEVEL_BITS PT32_LEVEL_BITS |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 52 | #define PT_MAX_FULL_LEVELS 2 |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 53 | #define CMPXCHG cmpxchg |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 54 | #else |
| 55 | #error Invalid PTTYPE value |
| 56 | #endif |
| 57 | |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 58 | #define gpte_to_gfn FNAME(gpte_to_gfn) |
| 59 | #define gpte_to_gfn_pde FNAME(gpte_to_gfn_pde) |
| 60 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 61 | /* |
| 62 | * The guest_walker structure emulates the behavior of the hardware page |
| 63 | * table walker. |
| 64 | */ |
| 65 | struct guest_walker { |
| 66 | int level; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 67 | gfn_t table_gfn[PT_MAX_FULL_LEVELS]; |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 68 | pt_element_t ptes[PT_MAX_FULL_LEVELS]; |
| 69 | gpa_t pte_gpa[PT_MAX_FULL_LEVELS]; |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 70 | unsigned pt_access; |
| 71 | unsigned pte_access; |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 72 | gfn_t gfn; |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 73 | u32 error_code; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 74 | }; |
| 75 | |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 76 | struct shadow_walker { |
| 77 | struct kvm_shadow_walk walker; |
| 78 | struct guest_walker *guest_walker; |
| 79 | int user_fault; |
| 80 | int write_fault; |
| 81 | int largepage; |
| 82 | int *ptwrite; |
| 83 | pfn_t pfn; |
| 84 | u64 *sptep; |
| 85 | }; |
| 86 | |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 87 | static gfn_t gpte_to_gfn(pt_element_t gpte) |
| 88 | { |
| 89 | return (gpte & PT_BASE_ADDR_MASK) >> PAGE_SHIFT; |
| 90 | } |
| 91 | |
| 92 | static gfn_t gpte_to_gfn_pde(pt_element_t gpte) |
| 93 | { |
| 94 | return (gpte & PT_DIR_BASE_ADDR_MASK) >> PAGE_SHIFT; |
| 95 | } |
| 96 | |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 97 | static bool FNAME(cmpxchg_gpte)(struct kvm *kvm, |
| 98 | gfn_t table_gfn, unsigned index, |
| 99 | pt_element_t orig_pte, pt_element_t new_pte) |
| 100 | { |
| 101 | pt_element_t ret; |
| 102 | pt_element_t *table; |
| 103 | struct page *page; |
| 104 | |
| 105 | page = gfn_to_page(kvm, table_gfn); |
Izik Eidus | 72dc67a | 2008-02-10 18:04:15 +0200 | [diff] [blame] | 106 | |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 107 | table = kmap_atomic(page, KM_USER0); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 108 | ret = CMPXCHG(&table[index], orig_pte, new_pte); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 109 | kunmap_atomic(table, KM_USER0); |
| 110 | |
| 111 | kvm_release_page_dirty(page); |
| 112 | |
| 113 | return (ret != orig_pte); |
| 114 | } |
| 115 | |
Avi Kivity | bedbe4e | 2007-12-09 16:52:56 +0200 | [diff] [blame] | 116 | static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu, pt_element_t gpte) |
| 117 | { |
| 118 | unsigned access; |
| 119 | |
| 120 | access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK; |
| 121 | #if PTTYPE == 64 |
| 122 | if (is_nx(vcpu)) |
| 123 | access &= ~(gpte >> PT64_NX_SHIFT); |
| 124 | #endif |
| 125 | return access; |
| 126 | } |
| 127 | |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 128 | /* |
| 129 | * Fetch a guest pte for a guest virtual address |
| 130 | */ |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 131 | static int FNAME(walk_addr)(struct guest_walker *walker, |
| 132 | struct kvm_vcpu *vcpu, gva_t addr, |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 133 | int write_fault, int user_fault, int fetch_fault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 134 | { |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 135 | pt_element_t pte; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 136 | gfn_t table_gfn; |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 137 | unsigned index, pt_access, pte_access; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 138 | gpa_t pte_gpa; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 139 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 140 | pgprintk("%s: addr %lx\n", __func__, addr); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 141 | walk: |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 142 | walker->level = vcpu->arch.mmu.root_level; |
| 143 | pte = vcpu->arch.cr3; |
Avi Kivity | 1b0973b | 2007-01-05 16:36:41 -0800 | [diff] [blame] | 144 | #if PTTYPE == 64 |
| 145 | if (!is_long_mode(vcpu)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 146 | pte = vcpu->arch.pdptrs[(addr >> 30) & 3]; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 147 | if (!is_present_pte(pte)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 148 | goto not_present; |
Avi Kivity | 1b0973b | 2007-01-05 16:36:41 -0800 | [diff] [blame] | 149 | --walker->level; |
| 150 | } |
| 151 | #endif |
Avi Kivity | a9058ec | 2006-12-29 16:49:37 -0800 | [diff] [blame] | 152 | ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) || |
Marcelo Tosatti | 24993d5 | 2008-02-14 21:25:39 -0200 | [diff] [blame] | 153 | (vcpu->arch.cr3 & CR3_NONPAE_RESERVED_BITS) == 0); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 154 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 155 | pt_access = ACC_ALL; |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 156 | |
| 157 | for (;;) { |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 158 | index = PT_INDEX(addr, walker->level); |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 159 | |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 160 | table_gfn = gpte_to_gfn(pte); |
Avi Kivity | 1755fbc | 2007-11-21 14:44:45 +0200 | [diff] [blame] | 161 | pte_gpa = gfn_to_gpa(table_gfn); |
Izik Eidus | ec8d4ea | 2007-11-19 11:28:19 +0200 | [diff] [blame] | 162 | pte_gpa += index * sizeof(pt_element_t); |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 163 | walker->table_gfn[walker->level - 1] = table_gfn; |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 164 | walker->pte_gpa[walker->level - 1] = pte_gpa; |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 165 | pgprintk("%s: table_gfn[%d] %lx\n", __func__, |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 166 | walker->level - 1, table_gfn); |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 167 | |
Izik Eidus | ec8d4ea | 2007-11-19 11:28:19 +0200 | [diff] [blame] | 168 | kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte)); |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 169 | |
| 170 | if (!is_present_pte(pte)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 171 | goto not_present; |
| 172 | |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 173 | if (write_fault && !is_writeble_pte(pte)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 174 | if (user_fault || is_write_protection(vcpu)) |
| 175 | goto access_error; |
| 176 | |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 177 | if (user_fault && !(pte & PT_USER_MASK)) |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 178 | goto access_error; |
| 179 | |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 180 | #if PTTYPE == 64 |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 181 | if (fetch_fault && is_nx(vcpu) && (pte & PT64_NX_MASK)) |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 182 | goto access_error; |
| 183 | #endif |
| 184 | |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 185 | if (!(pte & PT_ACCESSED_MASK)) { |
Avi Kivity | bf3f8e8 | 2007-02-19 14:37:46 +0200 | [diff] [blame] | 186 | mark_page_dirty(vcpu->kvm, table_gfn); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 187 | if (FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, |
| 188 | index, pte, pte|PT_ACCESSED_MASK)) |
| 189 | goto walk; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 190 | pte |= PT_ACCESSED_MASK; |
Avi Kivity | bf3f8e8 | 2007-02-19 14:37:46 +0200 | [diff] [blame] | 191 | } |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 192 | |
Avi Kivity | bedbe4e | 2007-12-09 16:52:56 +0200 | [diff] [blame] | 193 | pte_access = pt_access & FNAME(gpte_access)(vcpu, pte); |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 194 | |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 195 | walker->ptes[walker->level - 1] = pte; |
| 196 | |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 197 | if (walker->level == PT_PAGE_TABLE_LEVEL) { |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 198 | walker->gfn = gpte_to_gfn(pte); |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 199 | break; |
| 200 | } |
| 201 | |
| 202 | if (walker->level == PT_DIRECTORY_LEVEL |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 203 | && (pte & PT_PAGE_SIZE_MASK) |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 204 | && (PTTYPE == 64 || is_pse(vcpu))) { |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 205 | walker->gfn = gpte_to_gfn_pde(pte); |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 206 | walker->gfn += PT_INDEX(addr, PT_PAGE_TABLE_LEVEL); |
Avi Kivity | da92852 | 2007-11-21 13:54:47 +0200 | [diff] [blame] | 207 | if (PTTYPE == 32 && is_cpuid_PSE36()) |
| 208 | walker->gfn += pse36_gfn_delta(pte); |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 209 | break; |
| 210 | } |
| 211 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 212 | pt_access = pte_access; |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 213 | --walker->level; |
| 214 | } |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 215 | |
| 216 | if (write_fault && !is_dirty_pte(pte)) { |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 217 | bool ret; |
| 218 | |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 219 | mark_page_dirty(vcpu->kvm, table_gfn); |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 220 | ret = FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte, |
| 221 | pte|PT_DIRTY_MASK); |
| 222 | if (ret) |
| 223 | goto walk; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 224 | pte |= PT_DIRTY_MASK; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 225 | kvm_mmu_pte_write(vcpu, pte_gpa, (u8 *)&pte, sizeof(pte)); |
Marcelo Tosatti | 7819026 | 2007-12-11 19:12:27 -0500 | [diff] [blame] | 226 | walker->ptes[walker->level - 1] = pte; |
Avi Kivity | 42bf3f0 | 2007-10-17 12:18:47 +0200 | [diff] [blame] | 227 | } |
| 228 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 229 | walker->pt_access = pt_access; |
| 230 | walker->pte_access = pte_access; |
| 231 | pgprintk("%s: pte %llx pte_access %x pt_access %x\n", |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 232 | __func__, (u64)pte, pt_access, pte_access); |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 233 | return 1; |
| 234 | |
| 235 | not_present: |
| 236 | walker->error_code = 0; |
| 237 | goto err; |
| 238 | |
| 239 | access_error: |
| 240 | walker->error_code = PFERR_PRESENT_MASK; |
| 241 | |
| 242 | err: |
| 243 | if (write_fault) |
| 244 | walker->error_code |= PFERR_WRITE_MASK; |
| 245 | if (user_fault) |
| 246 | walker->error_code |= PFERR_USER_MASK; |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 247 | if (fetch_fault) |
| 248 | walker->error_code |= PFERR_FETCH_MASK; |
Shaohua Li | fe55188 | 2007-07-23 14:51:39 +0800 | [diff] [blame] | 249 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 250 | } |
| 251 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 252 | static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page, |
Dong, Eddie | 489f1d6 | 2008-01-07 11:14:20 +0200 | [diff] [blame] | 253 | u64 *spte, const void *pte) |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 254 | { |
| 255 | pt_element_t gpte; |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 256 | unsigned pte_access; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 257 | pfn_t pfn; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 258 | int largepage = vcpu->arch.update_pte.largepage; |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 259 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 260 | gpte = *(const pt_element_t *)pte; |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 261 | if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK)) { |
Dong, Eddie | 489f1d6 | 2008-01-07 11:14:20 +0200 | [diff] [blame] | 262 | if (!is_present_pte(gpte)) |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 263 | set_shadow_pte(spte, shadow_notrap_nonpresent_pte); |
| 264 | return; |
| 265 | } |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 266 | pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte); |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 267 | pte_access = page->role.access & FNAME(gpte_access)(vcpu, gpte); |
Avi Kivity | d7824ff | 2007-12-30 12:29:05 +0200 | [diff] [blame] | 268 | if (gpte_to_gfn(gpte) != vcpu->arch.update_pte.gfn) |
| 269 | return; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 270 | pfn = vcpu->arch.update_pte.pfn; |
| 271 | if (is_error_pfn(pfn)) |
Avi Kivity | d7824ff | 2007-12-30 12:29:05 +0200 | [diff] [blame] | 272 | return; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 273 | if (mmu_notifier_retry(vcpu, vcpu->arch.update_pte.mmu_seq)) |
| 274 | return; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 275 | kvm_get_pfn(pfn); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 276 | mmu_set_spte(vcpu, spte, page->role.access, pte_access, 0, 0, |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 277 | gpte & PT_DIRTY_MASK, NULL, largepage, gpte_to_gfn(gpte), |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 278 | pfn, true); |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 279 | } |
| 280 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 281 | /* |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 282 | * Fetch a shadow pte for a specific level in the paging hierarchy. |
| 283 | */ |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 284 | static int FNAME(shadow_walk_entry)(struct kvm_shadow_walk *_sw, |
Sheng Yang | d40a1ee | 2008-09-01 19:41:20 +0800 | [diff] [blame] | 285 | struct kvm_vcpu *vcpu, u64 addr, |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 286 | u64 *sptep, int level) |
| 287 | { |
| 288 | struct shadow_walker *sw = |
| 289 | container_of(_sw, struct shadow_walker, walker); |
| 290 | struct guest_walker *gw = sw->guest_walker; |
| 291 | unsigned access = gw->pt_access; |
| 292 | struct kvm_mmu_page *shadow_page; |
| 293 | u64 spte; |
| 294 | int metaphysical; |
| 295 | gfn_t table_gfn; |
| 296 | int r; |
| 297 | pt_element_t curr_pte; |
| 298 | |
| 299 | if (level == PT_PAGE_TABLE_LEVEL |
| 300 | || (sw->largepage && level == PT_DIRECTORY_LEVEL)) { |
| 301 | mmu_set_spte(vcpu, sptep, access, gw->pte_access & access, |
| 302 | sw->user_fault, sw->write_fault, |
| 303 | gw->ptes[gw->level-1] & PT_DIRTY_MASK, |
| 304 | sw->ptwrite, sw->largepage, gw->gfn, sw->pfn, |
| 305 | false); |
| 306 | sw->sptep = sptep; |
| 307 | return 1; |
| 308 | } |
| 309 | |
| 310 | if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) |
| 311 | return 0; |
| 312 | |
Marcelo Tosatti | 93a423e | 2008-09-23 13:18:29 -0300 | [diff] [blame] | 313 | if (is_large_pte(*sptep)) { |
| 314 | set_shadow_pte(sptep, shadow_trap_nonpresent_pte); |
| 315 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 316 | rmap_remove(vcpu->kvm, sptep); |
Marcelo Tosatti | 93a423e | 2008-09-23 13:18:29 -0300 | [diff] [blame] | 317 | } |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 318 | |
| 319 | if (level == PT_DIRECTORY_LEVEL && gw->level == PT_DIRECTORY_LEVEL) { |
| 320 | metaphysical = 1; |
| 321 | if (!is_dirty_pte(gw->ptes[level - 1])) |
| 322 | access &= ~ACC_WRITE_MASK; |
| 323 | table_gfn = gpte_to_gfn(gw->ptes[level - 1]); |
| 324 | } else { |
| 325 | metaphysical = 0; |
| 326 | table_gfn = gw->table_gfn[level - 2]; |
| 327 | } |
Sheng Yang | d40a1ee | 2008-09-01 19:41:20 +0800 | [diff] [blame] | 328 | shadow_page = kvm_mmu_get_page(vcpu, table_gfn, (gva_t)addr, level-1, |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 329 | metaphysical, access, sptep); |
| 330 | if (!metaphysical) { |
| 331 | r = kvm_read_guest_atomic(vcpu->kvm, gw->pte_gpa[level - 2], |
| 332 | &curr_pte, sizeof(curr_pte)); |
| 333 | if (r || curr_pte != gw->ptes[level - 2]) { |
| 334 | kvm_release_pfn_clean(sw->pfn); |
| 335 | sw->sptep = NULL; |
| 336 | return 1; |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | spte = __pa(shadow_page->spt) | PT_PRESENT_MASK | PT_ACCESSED_MASK |
| 341 | | PT_WRITABLE_MASK | PT_USER_MASK; |
| 342 | *sptep = spte; |
| 343 | return 0; |
| 344 | } |
| 345 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 346 | static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 347 | struct guest_walker *guest_walker, |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 348 | int user_fault, int write_fault, int largepage, |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 349 | int *ptwrite, pfn_t pfn) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 350 | { |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 351 | struct shadow_walker walker = { |
| 352 | .walker = { .entry = FNAME(shadow_walk_entry), }, |
| 353 | .guest_walker = guest_walker, |
| 354 | .user_fault = user_fault, |
| 355 | .write_fault = write_fault, |
| 356 | .largepage = largepage, |
| 357 | .ptwrite = ptwrite, |
| 358 | .pfn = pfn, |
| 359 | }; |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 360 | |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 361 | if (!is_present_pte(guest_walker->ptes[guest_walker->level - 1])) |
Avi Kivity | ac79c97 | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 362 | return NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 363 | |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 364 | walk_shadow(&walker.walker, vcpu, addr); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 365 | |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 366 | return walker.sptep; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | /* |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 370 | * Page fault handler. There are several causes for a page fault: |
| 371 | * - there is no shadow pte for the guest pte |
| 372 | * - write access through a shadow pte marked read only so that we can set |
| 373 | * the dirty bit |
| 374 | * - write access to a shadow pte marked read only so we can update the page |
| 375 | * dirty bitmap, when userspace requests it |
| 376 | * - mmio access; in this case we will never install a present shadow pte |
| 377 | * - normal guest page fault due to the guest pte marked not present, not |
| 378 | * writable, or not executable |
| 379 | * |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 380 | * Returns: 1 if we need to emulate the instruction, 0 otherwise, or |
| 381 | * a negative value on error. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 382 | */ |
| 383 | static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, |
| 384 | u32 error_code) |
| 385 | { |
| 386 | int write_fault = error_code & PFERR_WRITE_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 387 | int user_fault = error_code & PFERR_USER_MASK; |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 388 | int fetch_fault = error_code & PFERR_FETCH_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 389 | struct guest_walker walker; |
| 390 | u64 *shadow_pte; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 391 | int write_pt = 0; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 392 | int r; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 393 | pfn_t pfn; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 394 | int largepage = 0; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 395 | unsigned long mmu_seq; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 396 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 397 | pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code); |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 398 | kvm_mmu_audit(vcpu, "pre page fault"); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 399 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 400 | r = mmu_topup_memory_caches(vcpu); |
| 401 | if (r) |
| 402 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 403 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 404 | /* |
| 405 | * Look up the shadow pte for the faulting address. |
| 406 | */ |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 407 | r = FNAME(walk_addr)(&walker, vcpu, addr, write_fault, user_fault, |
| 408 | fetch_fault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 409 | |
| 410 | /* |
| 411 | * The page is not mapped by the guest. Let the guest handle it. |
| 412 | */ |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 413 | if (!r) { |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 414 | pgprintk("%s: guest page fault\n", __func__); |
Avi Kivity | 7993ba4 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 415 | inject_page_fault(vcpu, addr, walker.error_code); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 416 | vcpu->arch.last_pt_write_count = 0; /* reset fork detector */ |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 417 | return 0; |
| 418 | } |
| 419 | |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 420 | if (walker.level == PT_DIRECTORY_LEVEL) { |
| 421 | gfn_t large_gfn; |
| 422 | large_gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE-1); |
| 423 | if (is_largepage_backed(vcpu, large_gfn)) { |
| 424 | walker.gfn = large_gfn; |
| 425 | largepage = 1; |
| 426 | } |
| 427 | } |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 428 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 429 | smp_rmb(); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 430 | pfn = gfn_to_pfn(vcpu->kvm, walker.gfn); |
Avi Kivity | d7824ff | 2007-12-30 12:29:05 +0200 | [diff] [blame] | 431 | |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 432 | /* mmio */ |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 433 | if (is_error_pfn(pfn)) { |
Avi Kivity | ebb0e62 | 2008-05-20 16:21:58 +0300 | [diff] [blame] | 434 | pgprintk("gfn %lx is mmio\n", walker.gfn); |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 435 | kvm_release_pfn_clean(pfn); |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 436 | return 1; |
| 437 | } |
| 438 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 439 | spin_lock(&vcpu->kvm->mmu_lock); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 440 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
| 441 | goto out_unlock; |
Avi Kivity | eb787d1 | 2007-12-31 15:27:49 +0200 | [diff] [blame] | 442 | kvm_mmu_free_some_pages(vcpu); |
Avi Kivity | 97a0a01 | 2007-05-31 15:08:29 +0300 | [diff] [blame] | 443 | shadow_pte = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault, |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 444 | largepage, &write_pt, pfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 445 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 446 | pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __func__, |
Avi Kivity | 97a0a01 | 2007-05-31 15:08:29 +0300 | [diff] [blame] | 447 | shadow_pte, *shadow_pte, write_pt); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 448 | |
Avi Kivity | a25f7e1 | 2007-04-30 17:05:38 +0300 | [diff] [blame] | 449 | if (!write_pt) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 450 | vcpu->arch.last_pt_write_count = 0; /* reset fork detector */ |
Avi Kivity | a25f7e1 | 2007-04-30 17:05:38 +0300 | [diff] [blame] | 451 | |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 452 | ++vcpu->stat.pf_fixed; |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 453 | kvm_mmu_audit(vcpu, "post page fault (fixed)"); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 454 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 455 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 456 | return write_pt; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 457 | |
| 458 | out_unlock: |
| 459 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 460 | kvm_release_pfn_clean(pfn); |
| 461 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) |
| 465 | { |
| 466 | struct guest_walker walker; |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 467 | gpa_t gpa = UNMAPPED_GVA; |
| 468 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 469 | |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 470 | r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 471 | |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 472 | if (r) { |
Avi Kivity | 1755fbc | 2007-11-21 14:44:45 +0200 | [diff] [blame] | 473 | gpa = gfn_to_gpa(walker.gfn); |
Avi Kivity | e119d11 | 2007-02-12 00:54:36 -0800 | [diff] [blame] | 474 | gpa |= vaddr & ~PAGE_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | return gpa; |
| 478 | } |
| 479 | |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 480 | static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu, |
| 481 | struct kvm_mmu_page *sp) |
| 482 | { |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 483 | int i, j, offset, r; |
| 484 | pt_element_t pt[256 / sizeof(pt_element_t)]; |
| 485 | gpa_t pte_gpa; |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 486 | |
Avi Kivity | e5a4c8c | 2007-11-20 21:39:54 +0200 | [diff] [blame] | 487 | if (sp->role.metaphysical |
| 488 | || (PTTYPE == 32 && sp->role.level > PT_PAGE_TABLE_LEVEL)) { |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 489 | nonpaging_prefetch_page(vcpu, sp); |
| 490 | return; |
| 491 | } |
| 492 | |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 493 | pte_gpa = gfn_to_gpa(sp->gfn); |
| 494 | if (PTTYPE == 32) { |
Avi Kivity | e5a4c8c | 2007-11-20 21:39:54 +0200 | [diff] [blame] | 495 | offset = sp->role.quadrant << PT64_LEVEL_BITS; |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 496 | pte_gpa += offset * sizeof(pt_element_t); |
| 497 | } |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 498 | |
Avi Kivity | eab9f71 | 2008-05-29 14:20:16 +0300 | [diff] [blame] | 499 | for (i = 0; i < PT64_ENT_PER_PAGE; i += ARRAY_SIZE(pt)) { |
| 500 | r = kvm_read_guest_atomic(vcpu->kvm, pte_gpa, pt, sizeof pt); |
| 501 | pte_gpa += ARRAY_SIZE(pt) * sizeof(pt_element_t); |
| 502 | for (j = 0; j < ARRAY_SIZE(pt); ++j) |
| 503 | if (r || is_present_pte(pt[j])) |
| 504 | sp->spt[i+j] = shadow_trap_nonpresent_pte; |
| 505 | else |
| 506 | sp->spt[i+j] = shadow_notrap_nonpresent_pte; |
Marcelo Tosatti | 7ec5458 | 2007-12-20 19:18:23 -0500 | [diff] [blame] | 507 | } |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 508 | } |
| 509 | |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame^] | 510 | /* |
| 511 | * Using the cached information from sp->gfns is safe because: |
| 512 | * - The spte has a reference to the struct page, so the pfn for a given gfn |
| 513 | * can't change unless all sptes pointing to it are nuked first. |
| 514 | * - Alias changes zap the entire shadow cache. |
| 515 | */ |
| 516 | static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) |
| 517 | { |
| 518 | int i, offset, nr_present; |
| 519 | |
| 520 | offset = nr_present = 0; |
| 521 | |
| 522 | if (PTTYPE == 32) |
| 523 | offset = sp->role.quadrant << PT64_LEVEL_BITS; |
| 524 | |
| 525 | for (i = 0; i < PT64_ENT_PER_PAGE; i++) { |
| 526 | unsigned pte_access; |
| 527 | pt_element_t gpte; |
| 528 | gpa_t pte_gpa; |
| 529 | gfn_t gfn = sp->gfns[i]; |
| 530 | |
| 531 | if (!is_shadow_present_pte(sp->spt[i])) |
| 532 | continue; |
| 533 | |
| 534 | pte_gpa = gfn_to_gpa(sp->gfn); |
| 535 | pte_gpa += (i+offset) * sizeof(pt_element_t); |
| 536 | |
| 537 | if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte, |
| 538 | sizeof(pt_element_t))) |
| 539 | return -EINVAL; |
| 540 | |
| 541 | if (gpte_to_gfn(gpte) != gfn || !is_present_pte(gpte) || |
| 542 | !(gpte & PT_ACCESSED_MASK)) { |
| 543 | u64 nonpresent; |
| 544 | |
| 545 | rmap_remove(vcpu->kvm, &sp->spt[i]); |
| 546 | if (is_present_pte(gpte)) |
| 547 | nonpresent = shadow_trap_nonpresent_pte; |
| 548 | else |
| 549 | nonpresent = shadow_notrap_nonpresent_pte; |
| 550 | set_shadow_pte(&sp->spt[i], nonpresent); |
| 551 | continue; |
| 552 | } |
| 553 | |
| 554 | nr_present++; |
| 555 | pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte); |
| 556 | set_spte(vcpu, &sp->spt[i], pte_access, 0, 0, |
| 557 | is_dirty_pte(gpte), 0, gfn, |
| 558 | spte_to_pfn(sp->spt[i]), true); |
| 559 | } |
| 560 | |
| 561 | return !nr_present; |
| 562 | } |
| 563 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 564 | #undef pt_element_t |
| 565 | #undef guest_walker |
Avi Kivity | abb9e0b | 2008-08-22 19:11:39 +0300 | [diff] [blame] | 566 | #undef shadow_walker |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 567 | #undef FNAME |
| 568 | #undef PT_BASE_ADDR_MASK |
| 569 | #undef PT_INDEX |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 570 | #undef PT_LEVEL_MASK |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 571 | #undef PT_DIR_BASE_ADDR_MASK |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 572 | #undef PT_LEVEL_BITS |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 573 | #undef PT_MAX_FULL_LEVELS |
Avi Kivity | 5fb07dd | 2007-11-21 12:35:07 +0200 | [diff] [blame] | 574 | #undef gpte_to_gfn |
| 575 | #undef gpte_to_gfn_pde |
Marcelo Tosatti | b3e4e63 | 2007-12-07 07:56:58 -0500 | [diff] [blame] | 576 | #undef CMPXCHG |