xen-vtx-unstable

annotate xen/include/asm-x86/shadow_64.h @ 6776:e7c7196fa329

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author cl349@firebug.cl.cam.ac.uk
date Tue Sep 13 15:46:49 2005 +0000 (2005-09-13)
parents 4d899a738d59 291e816acbf4
children 72e4e2aab342
rev   line source
kaf24@5726 1 /******************************************************************************
kaf24@5726 2 * include/asm-x86/shadow_64.h
kaf24@5726 3 *
kaf24@5726 4 * Copyright (c) 2005 Michael A Fetterman
kaf24@5726 5 * Based on an earlier implementation by Ian Pratt et al
kaf24@5726 6 *
kaf24@5726 7 * This program is free software; you can redistribute it and/or modify
kaf24@5726 8 * it under the terms of the GNU General Public License as published by
kaf24@5726 9 * the Free Software Foundation; either version 2 of the License, or
kaf24@5726 10 * (at your option) any later version.
kaf24@5726 11 *
kaf24@5726 12 * This program is distributed in the hope that it will be useful,
kaf24@5726 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
kaf24@5726 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
kaf24@5726 15 * GNU General Public License for more details.
kaf24@5726 16 *
kaf24@5726 17 * You should have received a copy of the GNU General Public License
kaf24@5726 18 * along with this program; if not, write to the Free Software
kaf24@5726 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
kaf24@5726 20 */
kaf24@5726 21 /*
kaf24@5726 22 * Jun Nakajima <jun.nakajima@intel.com>
kaf24@5726 23 * Chengyuan Li <chengyuan.li@intel.com>
kaf24@5726 24 *
kaf24@5726 25 * Extended to support 64-bit guests.
kaf24@5726 26 */
kaf24@5726 27 #ifndef _XEN_SHADOW_64_H
kaf24@5726 28 #define _XEN_SHADOW_64_H
kaf24@5726 29 #include <asm/shadow.h>
kaf24@6582 30 #include <asm/shadow_ops.h>
kaf24@5726 31
kaf24@5726 32 #define READ_FAULT 0
kaf24@5726 33 #define WRITE_FAULT 1
kaf24@5726 34
kaf24@5726 35 #define ERROR_W 2
kaf24@5726 36 #define ERROR_U 4
kaf24@5726 37 #define X86_64_SHADOW_DEBUG 0
kaf24@5726 38
kaf24@5726 39 #if X86_64_SHADOW_DEBUG
kaf24@5726 40 #define ESH_LOG(_f, _a...) \
kaf24@5726 41 printk(_f, ##_a)
kaf24@5726 42 #else
kaf24@5726 43 #define ESH_LOG(_f, _a...) ((void)0)
kaf24@5726 44 #endif
kaf24@5726 45
kaf24@6582 46 #define PAGING_L4 4UL
kaf24@6582 47 #define PAGING_L3 3UL
kaf24@6582 48 #define PAGING_L2 2UL
kaf24@6582 49 #define PAGING_L1 1UL
kaf24@5726 50 #define L_MASK 0xff
kaf24@5726 51
kaf24@6582 52 #define ROOT_LEVEL_64 PAGING_L4
kaf24@6582 53 #define ROOT_LEVEL_32 PAGING_L2
kaf24@5726 54
kaf24@5726 55 #define SHADOW_ENTRY (2UL << 16)
kaf24@5726 56 #define GUEST_ENTRY (1UL << 16)
kaf24@5726 57
kaf24@5726 58 #define GET_ENTRY (2UL << 8)
kaf24@5726 59 #define SET_ENTRY (1UL << 8)
kaf24@5726 60
kaf24@5726 61 #define PAGETABLE_ENTRIES (1<<PAGETABLE_ORDER)
kaf24@5726 62
kaf24@6582 63 /* For 32-bit VMX guest to allocate shadow L1 & L2*/
kaf24@6582 64 #define SL1_ORDER 1
kaf24@6582 65 #define SL2_ORDER 2
kaf24@6582 66
kaf24@5726 67 typedef struct { intpte_t lo; } pgentry_64_t;
kaf24@5726 68 #define shadow_level_to_type(l) (l << 29)
kaf24@5726 69 #define shadow_type_to_level(t) (t >> 29)
kaf24@5726 70
kaf24@5726 71 #define entry_get_value(_x) ((_x).lo)
kaf24@5726 72 #define entry_get_pfn(_x) \
kaf24@5726 73 (((_x).lo & (PADDR_MASK&PAGE_MASK)) >> PAGE_SHIFT)
kaf24@5726 74 #define entry_get_paddr(_x) (((_x).lo & (PADDR_MASK&PAGE_MASK)))
kaf24@5726 75 #define entry_get_flags(_x) (get_pte_flags((_x).lo))
kaf24@5726 76
kaf24@5726 77 #define entry_empty() ((pgentry_64_t) { 0 })
kaf24@5726 78 #define entry_from_pfn(pfn, flags) \
kaf24@5726 79 ((pgentry_64_t) { ((intpte_t)(pfn) << PAGE_SHIFT) | put_pte_flags(flags) })
kaf24@5726 80 #define entry_add_flags(x, flags) ((x).lo |= put_pte_flags(flags))
kaf24@5726 81 #define entry_remove_flags(x, flags) ((x).lo &= ~put_pte_flags(flags))
kaf24@5726 82 #define entry_has_changed(x,y,flags) \
kaf24@5726 83 ( !!(((x).lo ^ (y).lo) & ((PADDR_MASK&PAGE_MASK)|put_pte_flags(flags))) )
kaf24@6582 84
kaf24@6582 85 #define PAE_SHADOW_SELF_ENTRY 259
kaf24@6582 86 #define PDP_ENTRIES 4
kaf24@6582 87
kaf24@5726 88 static inline int table_offset_64(unsigned long va, int level)
kaf24@5726 89 {
kaf24@5726 90 switch(level) {
kaf24@5726 91 case 1:
kaf24@5726 92 return (((va) >> L1_PAGETABLE_SHIFT) & (L1_PAGETABLE_ENTRIES - 1));
kaf24@5726 93 case 2:
kaf24@5726 94 return (((va) >> L2_PAGETABLE_SHIFT) & (L2_PAGETABLE_ENTRIES - 1));
kaf24@5726 95 case 3:
kaf24@5726 96 return (((va) >> L3_PAGETABLE_SHIFT) & (L3_PAGETABLE_ENTRIES - 1));
kaf24@5909 97 #if CONFIG_PAGING_LEVELS >= 4
kaf24@6582 98 #ifndef GUEST_PGENTRY_32
kaf24@5726 99 case 4:
kaf24@5726 100 return (((va) >> L4_PAGETABLE_SHIFT) & (L4_PAGETABLE_ENTRIES - 1));
kaf24@6582 101 #else
kaf24@6582 102 case 4:
kaf24@6582 103 return PAE_SHADOW_SELF_ENTRY;
kaf24@6582 104 #endif
kaf24@5909 105 #endif
kaf24@5726 106 default:
kaf24@5726 107 //printk("<table_offset_64> level %d is too big\n", level);
kaf24@5726 108 return -1;
kaf24@5726 109 }
kaf24@5726 110 }
kaf24@5726 111
kaf24@5726 112 static inline void free_out_of_sync_state(struct domain *d)
kaf24@5726 113 {
kaf24@5726 114 struct out_of_sync_entry *entry;
kaf24@5726 115
kaf24@5726 116 // NB: Be careful not to call something that manipulates this list
kaf24@5726 117 // while walking it. Remove one item at a time, and always
kaf24@5726 118 // restart from start of list.
kaf24@5726 119 //
kaf24@5726 120 while ( (entry = d->arch.out_of_sync) )
kaf24@5726 121 {
kaf24@5726 122 d->arch.out_of_sync = entry->next;
kaf24@5726 123 release_out_of_sync_entry(d, entry);
kaf24@5726 124
kaf24@5726 125 entry->next = d->arch.out_of_sync_free;
kaf24@5726 126 d->arch.out_of_sync_free = entry;
kaf24@5726 127 }
kaf24@5726 128 }
kaf24@5726 129
kaf24@5726 130 static inline pgentry_64_t *__entry(
kaf24@5726 131 struct vcpu *v, u64 va, u32 flag)
kaf24@5726 132 {
kaf24@5726 133 int i;
kaf24@5726 134 pgentry_64_t *le_e;
kaf24@5726 135 pgentry_64_t *le_p;
kaf24@5726 136 unsigned long mfn;
kaf24@5726 137 int index;
kaf24@5726 138 u32 level = flag & L_MASK;
kaf24@5726 139 struct domain *d = v->domain;
kaf24@5726 140
kaf24@5726 141 index = table_offset_64(va, ROOT_LEVEL_64);
kaf24@5726 142 if (flag & SHADOW_ENTRY)
kaf24@5726 143 le_e = (pgentry_64_t *)&v->arch.shadow_vtable[index];
kaf24@5726 144 else
kaf24@5726 145 le_e = (pgentry_64_t *)&v->arch.guest_vtable[index];
kaf24@5726 146
kaf24@5726 147 /*
kaf24@5726 148 * If it's not external mode, then mfn should be machine physical.
kaf24@5726 149 */
kaf24@5726 150 for (i = ROOT_LEVEL_64 - level; i > 0; i--) {
kaf24@5726 151 if (unlikely(!(entry_get_flags(*le_e) & _PAGE_PRESENT)))
kaf24@5726 152 return NULL;
kaf24@5726 153 mfn = entry_get_value(*le_e) >> PAGE_SHIFT;
kaf24@5726 154 if ((flag & GUEST_ENTRY) && shadow_mode_translate(d))
kaf24@6481 155 mfn = get_mfn_from_pfn(mfn);
kaf24@5726 156 le_p = (pgentry_64_t *)phys_to_virt(mfn << PAGE_SHIFT);
kaf24@5726 157 index = table_offset_64(va, (level + i - 1));
kaf24@5726 158 le_e = &le_p[index];
kaf24@5726 159
kaf24@5726 160 }
kaf24@5726 161 return le_e;
kaf24@5726 162
kaf24@5726 163 }
kaf24@5726 164
kaf24@5726 165 static inline pgentry_64_t *__rw_entry(
kaf24@5726 166 struct vcpu *ed, u64 va, void *e_p, u32 flag)
kaf24@5726 167 {
kaf24@5726 168 pgentry_64_t *le_e = __entry(ed, va, flag);
kaf24@5726 169 pgentry_64_t *e = (pgentry_64_t *)e_p;
kaf24@5726 170 if (le_e == NULL)
kaf24@5726 171 return NULL;
kaf24@5726 172
kaf24@5726 173 if (e) {
kaf24@5726 174 if (flag & SET_ENTRY)
kaf24@5726 175 *le_e = *e;
kaf24@5726 176 else
kaf24@5726 177 *e = *le_e;
kaf24@5726 178 }
kaf24@5726 179 return le_e;
kaf24@5726 180 }
kaf24@5726 181 #define __shadow_set_l4e(v, va, value) \
kaf24@6582 182 __rw_entry(v, va, value, SHADOW_ENTRY | SET_ENTRY | PAGING_L4)
kaf24@5726 183 #define __shadow_get_l4e(v, va, sl4e) \
kaf24@6582 184 __rw_entry(v, va, sl4e, SHADOW_ENTRY | GET_ENTRY | PAGING_L4)
kaf24@5726 185 #define __shadow_set_l3e(v, va, value) \
kaf24@6582 186 __rw_entry(v, va, value, SHADOW_ENTRY | SET_ENTRY | PAGING_L3)
kaf24@5726 187 #define __shadow_get_l3e(v, va, sl3e) \
kaf24@6582 188 __rw_entry(v, va, sl3e, SHADOW_ENTRY | GET_ENTRY | PAGING_L3)
kaf24@5726 189 #define __shadow_set_l2e(v, va, value) \
kaf24@6582 190 __rw_entry(v, va, value, SHADOW_ENTRY | SET_ENTRY | PAGING_L2)
kaf24@5726 191 #define __shadow_get_l2e(v, va, sl2e) \
kaf24@6582 192 __rw_entry(v, va, sl2e, SHADOW_ENTRY | GET_ENTRY | PAGING_L2)
kaf24@5726 193 #define __shadow_set_l1e(v, va, value) \
kaf24@6582 194 __rw_entry(v, va, value, SHADOW_ENTRY | SET_ENTRY | PAGING_L1)
kaf24@5726 195 #define __shadow_get_l1e(v, va, sl1e) \
kaf24@6582 196 __rw_entry(v, va, sl1e, SHADOW_ENTRY | GET_ENTRY | PAGING_L1)
kaf24@5726 197
kaf24@5726 198 #define __guest_set_l4e(v, va, value) \
kaf24@6582 199 __rw_entry(v, va, value, GUEST_ENTRY | SET_ENTRY | PAGING_L4)
kaf24@5726 200 #define __guest_get_l4e(v, va, gl4e) \
kaf24@6582 201 __rw_entry(v, va, gl4e, GUEST_ENTRY | GET_ENTRY | PAGING_L4)
kaf24@5726 202 #define __guest_set_l3e(v, va, value) \
kaf24@6582 203 __rw_entry(v, va, value, GUEST_ENTRY | SET_ENTRY | PAGING_L3)
kaf24@5726 204 #define __guest_get_l3e(v, va, sl3e) \
kaf24@6582 205 __rw_entry(v, va, gl3e, GUEST_ENTRY | GET_ENTRY | PAGING_L3)
kaf24@5726 206
kaf24@5726 207 static inline void * __guest_set_l2e(
kaf24@5726 208 struct vcpu *v, u64 va, void *value, int size)
kaf24@5726 209 {
kaf24@5726 210 switch(size) {
kaf24@5726 211 case 4:
kaf24@5726 212 // 32-bit guest
kaf24@5726 213 {
kaf24@5726 214 l2_pgentry_32_t *l2va;
kaf24@5726 215
kaf24@5726 216 l2va = (l2_pgentry_32_t *)v->arch.guest_vtable;
kaf24@5726 217 if (value)
kaf24@5726 218 l2va[l2_table_offset_32(va)] = *(l2_pgentry_32_t *)value;
kaf24@5726 219 return &l2va[l2_table_offset_32(va)];
kaf24@5726 220 }
kaf24@5726 221 case 8:
kaf24@6582 222 return __rw_entry(v, va, value, GUEST_ENTRY | SET_ENTRY | PAGING_L2);
kaf24@5726 223 default:
kaf24@5726 224 BUG();
kaf24@5726 225 return NULL;
kaf24@5726 226 }
kaf24@5726 227 return NULL;
kaf24@5726 228 }
kaf24@5726 229
kaf24@5726 230 #define __guest_set_l2e(v, va, value) \
kaf24@5726 231 ( __typeof__(value) )__guest_set_l2e(v, (u64)va, value, sizeof(*value))
kaf24@5726 232
kaf24@5726 233 static inline void * __guest_get_l2e(
kaf24@5726 234 struct vcpu *v, u64 va, void *gl2e, int size)
kaf24@5726 235 {
kaf24@5726 236 switch(size) {
kaf24@5726 237 case 4:
kaf24@5726 238 // 32-bit guest
kaf24@5726 239 {
kaf24@5726 240 l2_pgentry_32_t *l2va;
kaf24@5726 241 l2va = (l2_pgentry_32_t *)v->arch.guest_vtable;
kaf24@5726 242 if (gl2e)
kaf24@5726 243 *(l2_pgentry_32_t *)gl2e = l2va[l2_table_offset_32(va)];
kaf24@5726 244 return &l2va[l2_table_offset_32(va)];
kaf24@5726 245 }
kaf24@5726 246 case 8:
kaf24@6582 247 return __rw_entry(v, va, gl2e, GUEST_ENTRY | GET_ENTRY | PAGING_L2);
kaf24@5726 248 default:
kaf24@5726 249 BUG();
kaf24@5726 250 return NULL;
kaf24@5726 251 }
kaf24@5726 252 return NULL;
kaf24@5726 253 }
kaf24@5726 254
kaf24@5726 255 #define __guest_get_l2e(v, va, gl2e) \
kaf24@5726 256 (__typeof__ (gl2e))__guest_get_l2e(v, (u64)va, gl2e, sizeof(*gl2e))
kaf24@5726 257
kaf24@5726 258 static inline void * __guest_set_l1e(
kaf24@5726 259 struct vcpu *v, u64 va, void *value, int size)
kaf24@5726 260 {
kaf24@5726 261 switch(size) {
kaf24@5726 262 case 4:
kaf24@5726 263 // 32-bit guest
kaf24@5726 264 {
kaf24@5726 265 l2_pgentry_32_t gl2e;
kaf24@5726 266 l1_pgentry_32_t *l1va;
kaf24@5726 267 unsigned long l1mfn;
kaf24@5726 268
kaf24@5726 269 if (!__guest_get_l2e(v, va, &gl2e))
kaf24@5726 270 return NULL;
kaf24@5726 271 if (unlikely(!(l2e_get_flags_32(gl2e) & _PAGE_PRESENT)))
kaf24@5726 272 return NULL;
kaf24@5726 273
kaf24@6481 274 l1mfn = get_mfn_from_pfn(
kaf24@5726 275 l2e_get_pfn(gl2e));
kaf24@5726 276
kaf24@5726 277 l1va = (l1_pgentry_32_t *)
kaf24@5726 278 phys_to_virt(l1mfn << L1_PAGETABLE_SHIFT);
kaf24@5726 279 if (value)
kaf24@5726 280 l1va[l1_table_offset_32(va)] = *(l1_pgentry_32_t *)value;
kaf24@5726 281
kaf24@5726 282 return &l1va[l1_table_offset_32(va)];
kaf24@5726 283 }
kaf24@5726 284
kaf24@5726 285 case 8:
kaf24@6582 286 return __rw_entry(v, va, value, GUEST_ENTRY | SET_ENTRY | PAGING_L1);
kaf24@5726 287 default:
kaf24@5726 288 BUG();
kaf24@5726 289 return NULL;
kaf24@5726 290 }
kaf24@5726 291 return NULL;
kaf24@5726 292 }
kaf24@5726 293
kaf24@5726 294 #define __guest_set_l1e(v, va, value) \
kaf24@5726 295 ( __typeof__(value) )__guest_set_l1e(v, (u64)va, value, sizeof(*value))
kaf24@5726 296
kaf24@5726 297 static inline void * __guest_get_l1e(
kaf24@5726 298 struct vcpu *v, u64 va, void *gl1e, int size)
kaf24@5726 299 {
kaf24@5726 300 switch(size) {
kaf24@5726 301 case 4:
kaf24@5726 302 // 32-bit guest
kaf24@5726 303 {
kaf24@5726 304 l2_pgentry_32_t gl2e;
kaf24@5726 305 l1_pgentry_32_t *l1va;
kaf24@5726 306 unsigned long l1mfn;
kaf24@5726 307
kaf24@5726 308 if (!(__guest_get_l2e(v, va, &gl2e)))
kaf24@5726 309 return NULL;
kaf24@5726 310
kaf24@5726 311
kaf24@5726 312 if (unlikely(!(l2e_get_flags_32(gl2e) & _PAGE_PRESENT)))
kaf24@5726 313 return NULL;
kaf24@5726 314
kaf24@5726 315
kaf24@6481 316 l1mfn = get_mfn_from_pfn(
kaf24@5726 317 l2e_get_pfn(gl2e));
kaf24@5726 318 l1va = (l1_pgentry_32_t *) phys_to_virt(
kaf24@5726 319 l1mfn << L1_PAGETABLE_SHIFT);
kaf24@5726 320 if (gl1e)
kaf24@5726 321 *(l1_pgentry_32_t *)gl1e = l1va[l1_table_offset_32(va)];
kaf24@5726 322
kaf24@5726 323 return &l1va[l1_table_offset_32(va)];
kaf24@5726 324 }
kaf24@5726 325 case 8:
kaf24@5726 326 // 64-bit guest
kaf24@6582 327 return __rw_entry(v, va, gl1e, GUEST_ENTRY | GET_ENTRY | PAGING_L1);
kaf24@5726 328 default:
kaf24@5726 329 BUG();
kaf24@5726 330 return NULL;
kaf24@5726 331 }
kaf24@5726 332 return NULL;
kaf24@5726 333 }
kaf24@5726 334
kaf24@5726 335 #define __guest_get_l1e(v, va, gl1e) \
kaf24@5726 336 ( __typeof__(gl1e) )__guest_get_l1e(v, (u64)va, gl1e, sizeof(*gl1e))
kaf24@5726 337
kaf24@5726 338 static inline void entry_general(
kaf24@5726 339 struct domain *d,
kaf24@5726 340 pgentry_64_t *gle_p,
kaf24@5726 341 pgentry_64_t *sle_p,
kaf24@5726 342 unsigned long smfn, u32 level)
kaf24@5726 343
kaf24@5726 344 {
kaf24@5726 345 pgentry_64_t gle = *gle_p;
kaf24@5726 346 pgentry_64_t sle;
kaf24@5726 347
kaf24@5726 348 sle = entry_empty();
kaf24@5726 349 if ( (entry_get_flags(gle) & _PAGE_PRESENT) && (smfn != 0) )
kaf24@5726 350 {
kaf24@6582 351 if ((entry_get_flags(gle) & _PAGE_PSE) && level == PAGING_L2) {
kaf24@5726 352 sle = entry_from_pfn(smfn, entry_get_flags(gle));
kaf24@5726 353 entry_remove_flags(sle, _PAGE_PSE);
kaf24@5726 354
kaf24@5726 355 if ( shadow_mode_log_dirty(d) ||
kaf24@6730 356 !(entry_get_flags(gle) & _PAGE_DIRTY) )
kaf24@5726 357 {
kaf24@5726 358 pgentry_64_t *l1_p;
kaf24@5726 359 int i;
kaf24@5726 360
kaf24@5726 361 l1_p =(pgentry_64_t *)map_domain_page(smfn);
kaf24@5726 362 for (i = 0; i < L1_PAGETABLE_ENTRIES; i++)
kaf24@5726 363 entry_remove_flags(l1_p[i], _PAGE_RW);
kaf24@5726 364
kaf24@5726 365 unmap_domain_page(l1_p);
kaf24@5726 366 }
kaf24@5726 367 } else {
kaf24@6730 368 sle = entry_from_pfn(
kaf24@6730 369 smfn,
kaf24@6730 370 (entry_get_flags(gle) | _PAGE_RW | _PAGE_ACCESSED) & ~_PAGE_AVAIL);
kaf24@5726 371 entry_add_flags(gle, _PAGE_ACCESSED);
kaf24@5726 372 }
kaf24@5726 373 // XXX mafetter: Hmm...
kaf24@5726 374 // Shouldn't the dirty log be checked/updated here?
kaf24@5726 375 // Actually, it needs to be done in this function's callers.
kaf24@5726 376 //
kaf24@5726 377 *gle_p = gle;
kaf24@5726 378 }
kaf24@5726 379
kaf24@5726 380 if ( entry_get_value(sle) || entry_get_value(gle) )
kaf24@5726 381 SH_VVLOG("%s: gpde=%lx, new spde=%lx", __func__,
kaf24@5726 382 entry_get_value(gle), entry_get_value(sle));
kaf24@5726 383
kaf24@5726 384 *sle_p = sle;
kaf24@5726 385 }
kaf24@5726 386
kaf24@5726 387 static inline void entry_propagate_from_guest(
kaf24@5726 388 struct domain *d, pgentry_64_t *gle_p, pgentry_64_t *sle_p, u32 level)
kaf24@5726 389 {
kaf24@5726 390 pgentry_64_t gle = *gle_p;
kaf24@5726 391 unsigned long smfn = 0;
kaf24@5726 392
kaf24@5726 393 if ( entry_get_flags(gle) & _PAGE_PRESENT ) {
kaf24@6582 394 if ((entry_get_flags(gle) & _PAGE_PSE) && level == PAGING_L2) {
kaf24@5726 395 smfn = __shadow_status(d, entry_get_value(gle) >> PAGE_SHIFT, PGT_fl1_shadow);
kaf24@5726 396 } else {
kaf24@5726 397 smfn = __shadow_status(d, entry_get_pfn(gle),
kaf24@5726 398 shadow_level_to_type((level -1 )));
kaf24@5726 399 }
kaf24@5726 400 }
kaf24@5726 401 entry_general(d, gle_p, sle_p, smfn, level);
kaf24@5726 402
kaf24@5726 403 }
kaf24@5726 404
kaf24@5726 405 static int inline
kaf24@5726 406 validate_entry_change(
kaf24@5726 407 struct domain *d,
kaf24@5726 408 pgentry_64_t *new_gle_p,
kaf24@5726 409 pgentry_64_t *shadow_le_p,
kaf24@5726 410 u32 level)
kaf24@5726 411 {
kaf24@5726 412 pgentry_64_t old_sle, new_sle;
kaf24@5726 413 pgentry_64_t new_gle = *new_gle_p;
kaf24@5726 414
kaf24@5726 415 old_sle = *shadow_le_p;
kaf24@5726 416 entry_propagate_from_guest(d, &new_gle, &new_sle, level);
kaf24@5726 417
kaf24@5726 418 ESH_LOG("old_sle: %lx, new_gle: %lx, new_sle: %lx\n",
kaf24@5726 419 entry_get_value(old_sle), entry_get_value(new_gle),
kaf24@5726 420 entry_get_value(new_sle));
kaf24@5726 421
kaf24@5726 422 if ( ((entry_get_value(old_sle) | entry_get_value(new_sle)) & _PAGE_PRESENT) &&
kaf24@5726 423 entry_has_changed(old_sle, new_sle, _PAGE_PRESENT) )
kaf24@5726 424 {
kaf24@5726 425 perfc_incrc(validate_entry_changes);
kaf24@5726 426
kaf24@5726 427 if ( (entry_get_flags(new_sle) & _PAGE_PRESENT) &&
kaf24@5726 428 !get_shadow_ref(entry_get_pfn(new_sle)) )
kaf24@5726 429 BUG();
kaf24@5726 430 if ( entry_get_flags(old_sle) & _PAGE_PRESENT )
kaf24@5726 431 put_shadow_ref(entry_get_pfn(old_sle));
kaf24@5726 432 }
kaf24@5726 433
kaf24@5726 434 *shadow_le_p = new_sle;
kaf24@5726 435
kaf24@5726 436 return 1;
kaf24@5726 437 }
kaf24@5726 438
kaf24@5726 439 #endif
kaf24@5726 440
kaf24@5726 441