2 * This file is part of the Palacios Virtual Machine Monitor developed
3 * by the V3VEE Project with funding from the United States National
4 * Science Foundation and the Department of Energy.
6 * The V3VEE Project is a joint project between Northwestern University
7 * and the University of New Mexico. You can find out more at
10 * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
11 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
12 * All rights reserved.
14 * Author: Jack Lange <jarusl@cs.northwestern.edu>
16 * This is free software. You are permitted to use,
17 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
21 static inline int activate_shadow_pt_64(struct guest_info * info) {
22 struct cr3_64 * shadow_cr3 = (struct cr3_64 *)&(info->ctrl_regs.cr3);
23 struct cr3_64 * guest_cr3 = (struct cr3_64 *)&(info->shdw_pg_state.guest_cr3);
24 struct shadow_page_data * shadow_pt = create_new_shadow_pt(info);
25 addr_t shadow_pt_addr = shadow_pt->page_pa;
27 // Because this is a new CR3 load the allocated page is the new CR3 value
28 shadow_pt->cr3 = shadow_pt->page_pa;
30 PrintDebug(info->vm_info, info, "Top level Shadow page pa=%p\n", (void *)shadow_pt_addr);
32 shadow_cr3->pml4t_base_addr = PAGE_BASE_ADDR_4KB(shadow_pt_addr);
33 PrintDebug(info->vm_info, info, "Creating new 64 bit shadow page table %p\n", (void *)BASE_TO_PAGE_ADDR(shadow_cr3->pml4t_base_addr));
36 shadow_cr3->pwt = guest_cr3->pwt;
37 shadow_cr3->pcd = guest_cr3->pcd;
50 * * 64 bit Page table fault handlers
55 static int handle_2MB_shadow_pagefault_pde_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
56 pt_access_status_t shadow_pde_access, pde64_2MB_t * shadow_pt,
57 pde64_2MB_t * large_guest_pde);
58 static int handle_2MB_shadow_pagefault_pte_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
59 pte64_t * shadow_pt, pde64_2MB_t * large_guest_pde);
61 static int handle_pte_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
62 pte64_t * shadow_pt, pte64_t * guest_pt);
64 static int handle_pde_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
65 pde64_t * shadow_pd, pde64_t * guest_pd);
67 static int handle_pdpe_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
68 pdpe64_t * shadow_pdp, pdpe64_t * guest_pdp);
71 static inline int handle_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
72 pml4e64_t * guest_pml = NULL;
73 pml4e64_t * shadow_pml = CR3_TO_PML4E64_VA(info->ctrl_regs.cr3);
74 addr_t guest_cr3 = CR3_TO_PML4E64_PA(info->shdw_pg_state.guest_cr3);
75 pt_access_status_t guest_pml4e_access;
76 pt_access_status_t shadow_pml4e_access;
77 pml4e64_t * guest_pml4e = NULL;
78 pml4e64_t * shadow_pml4e = (pml4e64_t *)&(shadow_pml[PML4E64_INDEX(fault_addr)]);
80 PrintDebug(info->vm_info, info, "64 bit Shadow page fault handler: %p\n", (void *)fault_addr);
81 PrintDebug(info->vm_info, info, "Handling PML fault\n");
83 if (v3_gpa_to_hva(info, guest_cr3, (addr_t*)&guest_pml) == -1) {
84 PrintError(info->vm_info, info, "Invalid Guest PML4E Address: 0x%p\n", (void *)guest_cr3);
88 guest_pml4e = (pml4e64_t *)&(guest_pml[PML4E64_INDEX(fault_addr)]);
90 PrintDebug(info->vm_info, info, "Checking Guest %p\n", (void *)guest_pml);
91 // Check the guest page permissions
92 guest_pml4e_access = v3_can_access_pml4e64(guest_pml, fault_addr, error_code);
94 PrintDebug(info->vm_info, info, "Checking shadow %p\n", (void *)shadow_pml);
95 // Check the shadow page permissions
96 shadow_pml4e_access = v3_can_access_pml4e64(shadow_pml, fault_addr, error_code);
98 /* Was the page fault caused by the Guest's page tables? */
99 if (v3_is_guest_pf(guest_pml4e_access, shadow_pml4e_access) == 1) {
100 PrintDebug(info->vm_info, info, "Injecting PML4E pf to guest: (guest access error=%d) (pf error code=%d)\n",
101 *(uint_t *)&guest_pml4e_access, *(uint_t *)&error_code);
102 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
103 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
109 if (shadow_pml4e_access == PT_ACCESS_USER_ERROR) {
111 // PML4 Entry marked non-user
113 PrintDebug(info->vm_info, info, "Shadow Paging User access error (shadow_pml4e_access=0x%x, guest_pml4e_access=0x%x)\n",
114 shadow_pml4e_access, guest_pml4e_access);
115 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
116 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
120 } else if ((shadow_pml4e_access != PT_ACCESS_NOT_PRESENT) &&
121 (shadow_pml4e_access != PT_ACCESS_OK)) {
122 // inject page fault in guest
123 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
124 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
127 PrintDebug(info->vm_info, info, "Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pml4e_access);
128 PrintDebug(info->vm_info, info, "Manual Says to inject page fault into guest\n");
133 pdpe64_t * shadow_pdp = NULL;
134 pdpe64_t * guest_pdp = NULL;
136 // Get the next shadow page level, allocate if not present
138 if (shadow_pml4e_access == PT_ACCESS_NOT_PRESENT) {
139 struct shadow_page_data * shdw_page = create_new_shadow_pt(info);
140 shadow_pdp = (pdpe64_t *)V3_VAddr((void *)shdw_page->page_pa);
143 shadow_pml4e->present = 1;
144 shadow_pml4e->user_page = guest_pml4e->user_page;
145 shadow_pml4e->writable = guest_pml4e->writable;
146 shadow_pml4e->cache_disable = guest_pml4e->cache_disable;
147 shadow_pml4e->write_through = guest_pml4e->write_through;
149 guest_pml4e->accessed = 1;
151 shadow_pml4e->pdp_base_addr = PAGE_BASE_ADDR(shdw_page->page_pa);
153 shadow_pdp = (pdpe64_t *)V3_VAddr((void *)(addr_t)BASE_TO_PAGE_ADDR(shadow_pml4e->pdp_base_addr));
156 // Continue processing at the next level
158 if (v3_gpa_to_hva(info, BASE_TO_PAGE_ADDR(guest_pml4e->pdp_base_addr), (addr_t *)&guest_pdp) == -1) {
159 // Machine check the guest
160 PrintError(info->vm_info, info, "Invalid Guest PDP Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pml4e->pdp_base_addr));
161 v3_raise_exception(info, MC_EXCEPTION);
165 if (handle_pdpe_shadow_pagefault_64(info, fault_addr, error_code, shadow_pdp, guest_pdp) == -1) {
166 PrintError(info->vm_info, info, "Error handling Page fault caused by PDPE\n");
175 // For now we are not going to handle 1 Gigabyte pages
176 static int handle_pdpe_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
177 pdpe64_t * shadow_pdp, pdpe64_t * guest_pdp) {
178 pt_access_status_t guest_pdpe_access;
179 pt_access_status_t shadow_pdpe_access;
180 pdpe64_t * guest_pdpe = (pdpe64_t *)&(guest_pdp[PDPE64_INDEX(fault_addr)]);
181 pdpe64_t * shadow_pdpe = (pdpe64_t *)&(shadow_pdp[PDPE64_INDEX(fault_addr)]);
183 PrintDebug(info->vm_info, info, "Handling PDP fault\n");
186 PrintDebug(info->vm_info, info, "Guest Page Tree for guest virtual address zero fault\n");
187 PrintGuestPageTree(info,fault_addr,(addr_t)(info->shdw_pg_state.guest_cr3));
188 PrintDebug(info->vm_info, info, "Host Page Tree for guest virtual address zero fault\n");
189 PrintHostPageTree(info,fault_addr,(addr_t)(info->ctrl_regs.cr3));
192 // Check the guest page permissions
193 guest_pdpe_access = v3_can_access_pdpe64(guest_pdp, fault_addr, error_code);
195 // Check the shadow page permissions
196 shadow_pdpe_access = v3_can_access_pdpe64(shadow_pdp, fault_addr, error_code);
198 /* Was the page fault caused by the Guest's page tables? */
199 if (v3_is_guest_pf(guest_pdpe_access, shadow_pdpe_access) == 1) {
200 PrintDebug(info->vm_info, info, "Injecting PDPE pf to guest: (guest access error=%d) (pf error code=%d)\n",
201 *(uint_t *)&guest_pdpe_access, *(uint_t *)&error_code);
202 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
203 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
209 if (shadow_pdpe_access == PT_ACCESS_USER_ERROR) {
211 // PML4 Entry marked non-user
213 PrintDebug(info->vm_info, info, "Shadow Paging User access error (shadow_pdpe_access=0x%x, guest_pdpe_access=0x%x)\n",
214 shadow_pdpe_access, guest_pdpe_access);
215 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
216 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
220 } else if ((shadow_pdpe_access != PT_ACCESS_NOT_PRESENT) &&
221 (shadow_pdpe_access != PT_ACCESS_OK)) {
222 // inject page fault in guest
223 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
224 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
227 PrintDebug(info->vm_info, info, "Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pdpe_access);
228 PrintDebug(info->vm_info, info, "Manual Says to inject page fault into guest\n");
233 pde64_t * shadow_pd = NULL;
234 pde64_t * guest_pd = NULL;
236 // Get the next shadow page level, allocate if not present
238 if (shadow_pdpe_access == PT_ACCESS_NOT_PRESENT) {
239 struct shadow_page_data * shdw_page = create_new_shadow_pt(info);
240 shadow_pd = (pde64_t *)V3_VAddr((void *)shdw_page->page_pa);
243 shadow_pdpe->present = 1;
244 shadow_pdpe->user_page = guest_pdpe->user_page;
245 shadow_pdpe->writable = guest_pdpe->writable;
246 shadow_pdpe->write_through = guest_pdpe->write_through;
247 shadow_pdpe->cache_disable = guest_pdpe->cache_disable;
250 guest_pdpe->accessed = 1;
252 shadow_pdpe->pd_base_addr = PAGE_BASE_ADDR(shdw_page->page_pa);
254 shadow_pd = (pde64_t *)V3_VAddr((void *)(addr_t)BASE_TO_PAGE_ADDR(shadow_pdpe->pd_base_addr));
257 // Continue processing at the next level
259 if (v3_gpa_to_hva(info, BASE_TO_PAGE_ADDR(guest_pdpe->pd_base_addr), (addr_t *)&guest_pd) == -1) {
260 // Machine check the guest
261 PrintError(info->vm_info, info, "Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pdpe->pd_base_addr));
262 v3_raise_exception(info, MC_EXCEPTION);
266 if (handle_pde_shadow_pagefault_64(info, fault_addr, error_code, shadow_pd, guest_pd) == -1) {
267 PrintError(info->vm_info, info, "Error handling Page fault caused by PDE\n");
274 static int handle_pde_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
275 pde64_t * shadow_pd, pde64_t * guest_pd) {
276 pt_access_status_t guest_pde_access;
277 pt_access_status_t shadow_pde_access;
278 pde64_t * guest_pde = (pde64_t *)&(guest_pd[PDE64_INDEX(fault_addr)]);
279 pde64_t * shadow_pde = (pde64_t *)&(shadow_pd[PDE64_INDEX(fault_addr)]);
281 PrintDebug(info->vm_info, info, "Handling PDE fault\n");
283 // Check the guest page permissions
284 guest_pde_access = v3_can_access_pde64(guest_pd, fault_addr, error_code);
286 // Check the shadow page permissions
287 shadow_pde_access = v3_can_access_pde64(shadow_pd, fault_addr, error_code);
289 /* Was the page fault caused by the Guest's page tables? */
290 if (v3_is_guest_pf(guest_pde_access, shadow_pde_access) == 1) {
291 PrintDebug(info->vm_info, info, "Injecting PDE pf to guest: (guest access error=%d) (pf error code=%d)\n",
292 *(uint_t *)&guest_pde_access, *(uint_t *)&error_code);
293 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
294 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
300 if (shadow_pde_access == PT_ACCESS_USER_ERROR) {
302 // PDE Entry marked non-user
304 PrintDebug(info->vm_info, info, "Shadow Paging User access error (shadow_pdpe_access=0x%x, guest_pdpe_access=0x%x)\n",
305 shadow_pde_access, guest_pde_access);
306 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
307 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
312 } else if ((shadow_pde_access == PT_ACCESS_WRITE_ERROR) &&
313 (guest_pde->large_page == 1)) {
315 ((pde64_2MB_t *)guest_pde)->dirty = 1;
316 shadow_pde->writable = guest_pde->writable;
318 //PrintDebug(info->vm_info, info, "Returning due to large page Write Error\n");
319 //PrintHostPageTree(info, fault_addr, info->ctrl_regs.cr3);
322 } else if ((shadow_pde_access != PT_ACCESS_NOT_PRESENT) &&
323 (shadow_pde_access != PT_ACCESS_OK)) {
324 // inject page fault in guest
325 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
326 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
329 PrintDebug(info->vm_info, info, "Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access);
330 PrintDebug(info->vm_info, info, "Manual Says to inject page fault into guest\n");
334 pte64_t * shadow_pt = NULL;
335 pte64_t * guest_pt = NULL;
337 // get the next shadow page level, allocate if not present
338 if (shadow_pde_access == PT_ACCESS_NOT_PRESENT) {
339 // Check if we can use large pages and the guest memory is properly aligned
340 // to potentially use a large page
342 if ((info->use_large_pages == 1) && (guest_pde->large_page == 1)) {
343 addr_t guest_pa = BASE_TO_PAGE_ADDR_2MB(((pde64_2MB_t *)guest_pde)->page_base_addr);
344 uint32_t page_size = v3_get_max_page_size(info, guest_pa, LONG);
346 if (page_size == PAGE_SIZE_2MB) {
347 if (handle_2MB_shadow_pagefault_pde_64(info, fault_addr, error_code, shadow_pde_access,
348 (pde64_2MB_t *)shadow_pde, (pde64_2MB_t *)guest_pde) == -1) {
349 PrintError(info->vm_info, info, "Error handling large pagefault with large page\n");
355 // Fallthrough to handle the region with small pages
358 struct shadow_page_data * shdw_page = create_new_shadow_pt(info);
359 shadow_pt = (pte64_t *)V3_VAddr((void *)shdw_page->page_pa);
361 PrintDebug(info->vm_info, info, "Creating new shadow PT: %p\n", shadow_pt);
363 shadow_pde->present = 1;
364 shadow_pde->user_page = guest_pde->user_page;
366 if (guest_pde->large_page == 0) {
367 shadow_pde->writable = guest_pde->writable;
369 // This large page flag is temporary until we can get a working cache....
370 ((pde64_2MB_t *)guest_pde)->vmm_info = V3_LARGE_PG;
372 if (error_code.write) {
373 shadow_pde->writable = guest_pde->writable;
374 ((pde64_2MB_t *)guest_pde)->dirty = 1;
376 shadow_pde->writable = 0;
377 ((pde64_2MB_t *)guest_pde)->dirty = 0;
381 // VMM Specific options
382 shadow_pde->write_through = guest_pde->write_through;
383 shadow_pde->cache_disable = guest_pde->cache_disable;
384 shadow_pde->global_page = guest_pde->global_page;
387 guest_pde->accessed = 1;
389 shadow_pde->pt_base_addr = PAGE_BASE_ADDR(shdw_page->page_pa);
391 shadow_pt = (pte64_t *)V3_VAddr((void *)BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr));
394 // Continue processing at the next level
395 if (guest_pde->large_page == 0) {
396 if (v3_gpa_to_hva(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t *)&guest_pt) == -1) {
397 // Machine check the guest
398 PrintError(info->vm_info, info, "Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr));
399 v3_raise_exception(info, MC_EXCEPTION);
403 if (handle_pte_shadow_pagefault_64(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) {
404 PrintError(info->vm_info, info, "Error handling Page fault caused by PDE\n");
408 if (handle_2MB_shadow_pagefault_pte_64(info, fault_addr, error_code, shadow_pt, (pde64_2MB_t *)guest_pde) == -1) {
409 PrintError(info->vm_info, info, "Error handling large pagefault with small page\n");
418 static int handle_pte_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code,
419 pte64_t * shadow_pt, pte64_t * guest_pt) {
420 pt_access_status_t guest_pte_access;
421 pt_access_status_t shadow_pte_access;
422 pte64_t * guest_pte = (pte64_t *)&(guest_pt[PTE64_INDEX(fault_addr)]);;
423 pte64_t * shadow_pte = (pte64_t *)&(shadow_pt[PTE64_INDEX(fault_addr)]);
424 addr_t guest_pa = BASE_TO_PAGE_ADDR((addr_t)(guest_pte->page_base_addr)) + PAGE_OFFSET(fault_addr);
425 // struct shadow_page_state * state = &(info->shdw_pg_state);
427 PrintDebug(info->vm_info, info, "Handling PTE fault\n");
429 struct v3_mem_region * shdw_reg = v3_get_mem_region(info->vm_info, info->vcpu_id, guest_pa);
433 if (shdw_reg == NULL) {
434 // Inject a machine check in the guest
435 PrintError(info->vm_info, info, "Invalid Guest Address in page table (0x%p)\n", (void *)guest_pa);
436 v3_raise_exception(info, MC_EXCEPTION);
440 // Check the guest page permissions
441 guest_pte_access = v3_can_access_pte64(guest_pt, fault_addr, error_code);
443 // Check the shadow page permissions
444 shadow_pte_access = v3_can_access_pte64(shadow_pt, fault_addr, error_code);
446 /* Was the page fault caused by the Guest's page tables? */
447 if (v3_is_guest_pf(guest_pte_access, shadow_pte_access) == 1) {
449 PrintDebug(info->vm_info, info, "Access error injecting pf to guest (guest access error=%d) (pf error code=%d)\n",
450 guest_pte_access, *(uint_t*)&error_code);
452 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
453 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
461 if (shadow_pte_access == PT_ACCESS_OK) {
462 // Inconsistent state...
463 // Guest Re-Entry will flush page tables and everything should now work
464 PrintDebug(info->vm_info, info, "Inconsistent state... Guest re-entry should flush tlb\n");
469 if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
470 // Page Table Entry Not Present
471 PrintDebug(info->vm_info, info, "guest_pa =%p\n", (void *)guest_pa);
473 if ((shdw_reg->flags.alloced == 1) ||
474 (shdw_reg->flags.read == 1)) {
475 addr_t shadow_pa = 0;
477 if (v3_gpa_to_hpa(info, guest_pa, &shadow_pa) == -1) {
478 PrintError(info->vm_info, info, "could not translate page fault address (%p)\n", (void *)guest_pa);
482 shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
484 shadow_pte->present = guest_pte->present;
485 shadow_pte->user_page = guest_pte->user_page;
487 //set according to VMM policy
488 shadow_pte->write_through = guest_pte->write_through;
489 shadow_pte->cache_disable = guest_pte->cache_disable;
490 shadow_pte->global_page = guest_pte->global_page;
493 guest_pte->accessed = 1;
495 if (guest_pte->dirty == 1) {
496 shadow_pte->writable = guest_pte->writable;
497 } else if ((guest_pte->dirty == 0) && (error_code.write == 1)) {
498 shadow_pte->writable = guest_pte->writable;
499 guest_pte->dirty = 1;
500 } else if ((guest_pte->dirty == 0) && (error_code.write == 0)) {
501 shadow_pte->writable = 0;
505 // Write hooks trump all, and are set Read Only
506 if (shdw_reg->flags.write == 0) {
507 shadow_pte->writable = 0;
511 // Pass to unhandled call back
512 if (shdw_reg->unhandled(info, fault_addr, guest_pa, shdw_reg, error_code) == -1) {
513 PrintError(info->vm_info, info, "Special Page fault handler returned error for address: %p\n", (void *)fault_addr);
517 } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) {
518 guest_pte->dirty = 1;
521 if (shdw_reg->flags.write == 1) {
522 PrintDebug(info->vm_info, info, "Shadow PTE Write Error\n");
523 shadow_pte->writable = guest_pte->writable;
525 if (shdw_reg->unhandled(info, fault_addr, guest_pa, shdw_reg, error_code) == -1) {
526 PrintError(info->vm_info, info, "Special Page fault handler returned error for address: %p\n", (void *)fault_addr);
536 // Inject page fault into the guest
537 if (v3_inject_guest_pf(info, fault_addr, error_code) == -1) {
538 PrintError(info->vm_info, info, "Could not inject guest page fault\n");
541 PrintError(info->vm_info, info, "PTE Page fault fell through... Not sure if this should ever happen\n");
542 PrintError(info->vm_info, info, "Manual Says to inject page fault into guest\n");
550 static int handle_2MB_shadow_pagefault_pde_64(struct guest_info * info,
551 addr_t fault_addr, pf_error_t error_code,
552 pt_access_status_t shadow_pde_access,
553 pde64_2MB_t * large_shadow_pde, pde64_2MB_t * large_guest_pde)
555 addr_t guest_fault_pa = BASE_TO_PAGE_ADDR_2MB(large_guest_pde->page_base_addr) + PAGE_OFFSET_2MB(fault_addr);
556 // struct shadow_page_state * state = &(info->shdw_pg_state);
558 PrintDebug(info->vm_info, info, "Handling 2MB fault with large page (guest_fault_pa=%p) (error_code=%x)\n", (void *)guest_fault_pa, *(uint_t*)&error_code);
559 PrintDebug(info->vm_info, info, "LargeShadowPDE=%p, LargeGuestPDE=%p\n", large_shadow_pde, large_guest_pde);
561 struct v3_mem_region * shdw_reg = v3_get_mem_region(info->vm_info, info->vcpu_id, guest_fault_pa);
563 if (shdw_reg == NULL) {
564 // Inject a machine check in the guest
565 PrintError(info->vm_info, info, "Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa);
566 v3_raise_exception(info, MC_EXCEPTION);
570 if (shadow_pde_access == PT_ACCESS_OK) {
571 // Inconsistent state...
572 // Guest Re-Entry will flush tables and everything should now workd
573 PrintDebug(info->vm_info, info, "Inconsistent state... Guest re-entry should flush tlb\n");
574 //PrintHostPageTree(info, fault_addr, info->ctrl_regs.cr3);
579 if (shadow_pde_access == PT_ACCESS_NOT_PRESENT) {
580 // Get the guest physical address of the fault
582 if ((shdw_reg->flags.alloced == 1) ||
583 (shdw_reg->flags.read == 1)) {
584 addr_t shadow_pa = 0;
586 if (v3_gpa_to_hpa(info, guest_fault_pa, &shadow_pa) == -1) {
587 PrintError(info->vm_info, info, "could not translate page fault address (%p)\n", (void *)guest_fault_pa);
591 large_guest_pde->vmm_info = V3_LARGE_PG; /* For invalidations */
592 large_shadow_pde->page_base_addr = PAGE_BASE_ADDR_2MB(shadow_pa);
593 large_shadow_pde->large_page = 1;
594 large_shadow_pde->present = 1;
595 large_shadow_pde->user_page = 1;
597 if (shdw_reg->flags.write == 0) {
598 large_shadow_pde->writable = 0;
600 large_shadow_pde->writable = 1;
603 //set according to VMM policy
604 large_shadow_pde->write_through = large_guest_pde->write_through;
605 large_shadow_pde->cache_disable = large_guest_pde->cache_disable;
606 large_shadow_pde->global_page = large_guest_pde->global_page;
610 if (shdw_reg->unhandled(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) {
611 PrintError(info->vm_info, info, "Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
615 } else if (shadow_pde_access == PT_ACCESS_WRITE_ERROR) {
616 if (shdw_reg->unhandled(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) {
617 PrintError(info->vm_info, info, "Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
621 PrintError(info->vm_info, info, "Error in large page fault handler...\n");
622 PrintError(info->vm_info, info, "This case should have been handled at the top level handler\n");
626 // PrintHostPageTree(info, fault_addr, info->ctrl_regs.cr3);
627 PrintDebug(info->vm_info, info, "Returning from large page->large page fault handler\n");
631 static int handle_2MB_shadow_pagefault_pte_64(struct guest_info * info,
632 addr_t fault_addr, pf_error_t error_code,
633 pte64_t * shadow_pt, pde64_2MB_t * large_guest_pde)
635 pt_access_status_t shadow_pte_access = v3_can_access_pte64(shadow_pt, fault_addr, error_code);
636 pte64_t * shadow_pte = (pte64_t *)&(shadow_pt[PTE64_INDEX(fault_addr)]);
637 addr_t guest_fault_pa = BASE_TO_PAGE_ADDR_2MB(large_guest_pde->page_base_addr) + PAGE_OFFSET_2MB(fault_addr);
638 // struct shadow_page_state * state = &(info->shdw_pg_state);
640 PrintDebug(info->vm_info, info, "Handling 2MB fault (guest_fault_pa=%p) (error_code=%x)\n", (void *)guest_fault_pa, *(uint_t*)&error_code);
641 PrintDebug(info->vm_info, info, "ShadowPT=%p, LargeGuestPDE=%p\n", shadow_pt, large_guest_pde);
643 struct v3_mem_region * shdw_reg = v3_get_mem_region(info->vm_info, info->vcpu_id, guest_fault_pa);
646 if (shdw_reg == NULL) {
647 // Inject a machine check in the guest
648 PrintError(info->vm_info, info, "Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa);
649 v3_raise_exception(info, MC_EXCEPTION);
653 if (shadow_pte_access == PT_ACCESS_OK) {
654 // Inconsistent state...
655 // Guest Re-Entry will flush tables and everything should now workd
656 PrintDebug(info->vm_info, info, "Inconsistent state... Guest re-entry should flush tlb\n");
657 //PrintHostPageTree(info, fault_addr, info->ctrl_regs.cr3);
662 if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
663 // Get the guest physical address of the fault
665 if ((shdw_reg->flags.alloced == 1) ||
666 (shdw_reg->flags.read == 1)) {
667 addr_t shadow_pa = 0;
669 if (v3_gpa_to_hpa(info, guest_fault_pa, &shadow_pa) == -1) {
670 PrintError(info->vm_info, info, "could not translate page fault address (%p)\n", (void *)guest_fault_pa);
674 shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
676 shadow_pte->present = 1;
678 /* We are assuming that the PDE entry has precedence
679 * so the Shadow PDE will mirror the guest PDE settings,
680 * and we don't have to worry about them here
683 shadow_pte->user_page = 1;
685 if (shdw_reg->flags.write == 0) {
686 shadow_pte->writable = 0;
688 shadow_pte->writable = 1;
691 //set according to VMM policy
692 shadow_pte->write_through = large_guest_pde->write_through;
693 shadow_pte->cache_disable = large_guest_pde->cache_disable;
694 shadow_pte->global_page = large_guest_pde->global_page;
698 if (shdw_reg->unhandled(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) {
699 PrintError(info->vm_info, info, "Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
703 } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) {
704 if (shdw_reg->unhandled(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) {
705 PrintError(info->vm_info, info, "Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
709 PrintError(info->vm_info, info, "Error in large page fault handler...\n");
710 PrintError(info->vm_info, info, "This case should have been handled at the top level handler\n");
714 // PrintHostPageTree(info, fault_addr, info->ctrl_regs.cr3);
715 PrintDebug(info->vm_info, info, "Returning from large page->small page fault handler\n");
722 static int invalidation_cb_64(struct guest_info * info, page_type_t type,
723 addr_t vaddr, addr_t page_ptr, addr_t page_pa,
724 void * private_data) {
729 pml4e64_t * pml = (pml4e64_t *)page_ptr;
731 if (pml[PML4E64_INDEX(vaddr)].present == 0) {
738 pdpe64_t * pdp = (pdpe64_t *)page_ptr;
739 pdpe64_t * pdpe = &(pdp[PDPE64_INDEX(vaddr)]);
741 if (pdpe->present == 0) {
745 if (pdpe->vmm_info == V3_LARGE_PG) {
746 PrintError(info->vm_info, info, "1 Gigabyte pages not supported\n");
757 pde64_t * pd = (pde64_t *)page_ptr;
758 pde64_t * pde = &(pd[PDE64_INDEX(vaddr)]);
760 if (pde->present == 0) {
764 if (pde->vmm_info == V3_LARGE_PG) {
773 pte64_t * pt = (pte64_t *)page_ptr;
775 pt[PTE64_INDEX(vaddr)].present = 0;
780 PrintError(info->vm_info, info, "Invalid Page Type\n");
785 // should not get here
786 PrintError(info->vm_info, info, "Should not get here....\n");
791 static inline int handle_shadow_invlpg_64(struct guest_info * info, addr_t vaddr) {
792 PrintDebug(info->vm_info, info, "INVLPG64 - %p\n",(void*)vaddr);
794 int ret = v3_drill_host_pt_64(info, info->ctrl_regs.cr3, vaddr, invalidation_cb_64, NULL);
796 PrintError(info->vm_info, info, "Page table drill returned error.... \n");
797 PrintHostPageTree(info, vaddr, info->ctrl_regs.cr3);
800 return (ret == -1) ? -1 : 0;