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 #include <palacios/vmm_shadow_paging.h>
24 #include <palacios/vmm.h>
25 #include <palacios/vm_guest_mem.h>
26 #include <palacios/vmm_decoder.h>
27 #include <palacios/vmm_ctrl_regs.h>
29 #ifndef DEBUG_SHADOW_PAGING
31 #define PrintDebug(fmt, args...)
43 DEFINE_HASHTABLE_INSERT(add_cr3_to_cache, addr_t, struct hashtable *);
44 DEFINE_HASHTABLE_SEARCH(find_cr3_in_cache, addr_t, struct hashtable *);
45 DEFINE_HASHTABLE_REMOVE(del_cr3_from_cache, addr_t, struct hashtable *, 0);
48 DEFINE_HASHTABLE_INSERT(add_pte_map, addr_t, addr_t);
49 DEFINE_HASHTABLE_SEARCH(find_pte_map, addr_t, addr_t);
50 DEFINE_HASHTABLE_REMOVE(del_pte_map, addr_t, addr_t, 0);
54 static uint_t pte_hash_fn(addr_t key) {
55 return hash_long(key, 32);
58 static int pte_equals(addr_t key1, addr_t key2) {
59 return (key1 == key2);
62 static uint_t cr3_hash_fn(addr_t key) {
63 return hash_long(key, 32);
66 static int cr3_equals(addr_t key1, addr_t key2) {
67 return (key1 == key2);
72 static int activate_shadow_pt_32(struct guest_info * info);
73 static int activate_shadow_pt_32pae(struct guest_info * info);
74 static int activate_shadow_pt_64(struct guest_info * info);
77 static int handle_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
78 static int handle_shadow_pagefault_32pae(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
79 static int handle_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code);
82 static int cache_page_tables_32(struct guest_info * info, addr_t pde);
83 static int cache_page_tables_64(struct guest_info * info, addr_t pde);
85 int v3_init_shadow_page_state(struct guest_info * info) {
86 struct shadow_page_state * state = &(info->shdw_pg_state);
91 state->cr3_cache = create_hashtable(0, &cr3_hash_fn, &cr3_equals);
93 state->cached_cr3 = 0;
94 state->cached_ptes = NULL;
103 int v3_cache_page_tables(struct guest_info * info, addr_t cr3) {
104 switch(v3_get_cpu_mode(info)) {
106 return cache_page_tables_32(info, CR3_TO_PDE32_PA(cr3));
112 static int cache_page_tables_32(struct guest_info * info, addr_t pde) {
113 struct shadow_page_state * state = &(info->shdw_pg_state);
114 addr_t pde_host_addr;
116 struct hashtable * pte_cache = NULL;
119 if (pde == state->cached_cr3) {
123 if (state->cached_ptes != NULL) {
124 hashtable_destroy(state->cached_ptes, 0, 0);
125 state->cached_ptes = NULL;
128 state->cached_cr3 = pde;
130 pte_cache = create_hashtable(0, &pte_hash_fn, &pte_equals);
131 state->cached_ptes = pte_cache;
133 if (guest_pa_to_host_va(info, pde, &pde_host_addr) == -1) {
134 PrintError("Could not lookup host address of guest PDE\n");
138 tmp_pde = (pde32_t *)pde_host_addr;
140 add_pte_map(pte_cache, pde, pde_host_addr);
143 for (i = 0; i < MAX_PDE32_ENTRIES; i++) {
144 if ((tmp_pde[i].present) && (tmp_pde[i].large_page == 0)) {
145 addr_t pte_host_addr;
147 if (guest_pa_to_host_va(info, (addr_t)(BASE_TO_PAGE_ADDR(tmp_pde[i].pt_base_addr)), &pte_host_addr) == -1) {
148 PrintError("Could not lookup host address of guest PDE\n");
152 add_pte_map(pte_cache, (addr_t)(BASE_TO_PAGE_ADDR(tmp_pde[i].pt_base_addr)), pte_host_addr);
161 static int cache_page_tables_64(struct guest_info * info, addr_t pde) {
166 int v3_replace_shdw_page32(struct guest_info * info, addr_t location, pte32_t * new_page, pte32_t * old_page) {
167 pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
168 pde32_t * shadow_pde = (pde32_t *)&(shadow_pd[PDE32_INDEX(location)]);
170 if (shadow_pde->large_page == 0) {
171 pte32_t * shadow_pt = (pte32_t *)(addr_t)BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr);
172 pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(location)]);
174 //if (shadow_pte->present == 1) {
175 *(uint_t *)old_page = *(uint_t *)shadow_pte;
178 *(uint_t *)shadow_pte = *(uint_t *)new_page;
181 // currently unhandled
182 PrintError("Replacing large shadow pages not implemented\n");
193 // We assume that shdw_pg_state.guest_cr3 is pointing to the page tables we want to activate
194 // We also assume that the CPU mode has not changed during this page table transition
195 static int activate_shadow_pt_32(struct guest_info * info) {
196 struct cr3_32 * shadow_cr3 = (struct cr3_32 *)&(info->ctrl_regs.cr3);
197 struct cr3_32 * guest_cr3 = (struct cr3_32 *)&(info->shdw_pg_state.guest_cr3);
200 // Check if shadow page tables are in the cache
201 cached = cache_page_tables_32(info, CR3_TO_PDE32_PA(*(addr_t *)guest_cr3));
204 PrintError("CR3 Cache failed\n");
206 } else if (cached == 0) {
209 PrintDebug("New CR3 is different - flushing shadow page table %p\n", shadow_cr3 );
210 delete_page_tables_32(CR3_TO_PDE32_VA(*(uint_t*)shadow_cr3));
212 shadow_pt = v3_create_new_shadow_pt();
214 shadow_cr3->pdt_base_addr = (addr_t)V3_PAddr((void *)(addr_t)PAGE_BASE_ADDR(shadow_pt));
215 PrintDebug( "Created new shadow page table %p\n", (void *)(addr_t)shadow_cr3->pdt_base_addr );
217 PrintDebug("Reusing cached shadow Page table\n");
220 shadow_cr3->pwt = guest_cr3->pwt;
221 shadow_cr3->pcd = guest_cr3->pcd;
226 static int activate_shadow_pt_32pae(struct guest_info * info) {
227 PrintError("Activating 32 bit PAE page tables not implemented\n");
231 static int activate_shadow_pt_64_cb(page_type_t type, addr_t vaddr, addr_t page_ptr, addr_t page_pa, void * private_data) {
232 PrintDebug("CB: Page: %p->%p (host_ptr=%p), Type: %s\n", (void *)vaddr, (void *)page_pa, (void *)page_ptr, v3_page_type_to_str(type));
237 static int activate_shadow_pt_64(struct guest_info * info) {
238 // struct cr3_64 * shadow_cr3 = (struct cr3_64 *)&(info->ctrl_regs.cr3);
239 struct cr3_64 * guest_cr3 = (struct cr3_64 *)&(info->shdw_pg_state.guest_cr3);
242 v3_walk_guest_pt_64(info, info->shdw_pg_state.guest_cr3, activate_shadow_pt_64_cb, NULL);
249 // Check if shadow page tables are in the cache
250 cached = cache_page_tables_64(info, CR3_TO_PDE32_PA(*(addr_t *)guest_cr3));
253 PrintError("CR3 Cache failed\n");
255 } else if (cached == 0) {
258 PrintDebug("New CR3 is different - flushing shadow page table %p\n", shadow_cr3 );
259 delete_page_tables_32(CR3_TO_PDE32_VA(*(uint_t*)shadow_cr3));
261 shadow_pt = v3_create_new_shadow_pt();
263 shadow_cr3->pml4t_base_addr = (addr_t)V3_PAddr((void *)(addr_t)PAGE_BASE_ADDR(shadow_pt));
264 PrintDebug( "Created new shadow page table %p\n", (void *)(addr_t)shadow_cr3->pml4t_base_addr );
266 PrintDebug("Reusing cached shadow Page table\n");
269 shadow_cr3->pwt = guest_cr3->pwt;
270 shadow_cr3->pcd = guest_cr3->pcd;
277 // Reads the guest CR3 register
278 // creates new shadow page tables
279 // updates the shadow CR3 register to point to the new pts
280 int v3_activate_shadow_pt(struct guest_info * info) {
281 switch (info->cpu_mode) {
284 return activate_shadow_pt_32(info);
286 return activate_shadow_pt_32pae(info);
290 return activate_shadow_pt_64(info);
292 PrintError("Invalid CPU mode: %d\n", info->cpu_mode);
300 int v3_activate_passthrough_pt(struct guest_info * info) {
301 // For now... But we need to change this....
302 // As soon as shadow paging becomes active the passthrough tables are hosed
303 // So this will cause chaos if it is called at that time
305 info->ctrl_regs.cr3 = *(addr_t*)&(info->direct_map_pt);
306 //PrintError("Activate Passthrough Page tables not implemented\n");
312 int v3_handle_shadow_pagefault(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
314 if (info->mem_mode == PHYSICAL_MEM) {
315 // If paging is not turned on we need to handle the special cases
317 #ifdef DEBUG_SHADOW_PAGING
318 PrintHostPageTree(info->cpu_mode, fault_addr, info->ctrl_regs.cr3);
319 PrintGuestPageTree(info, fault_addr, info->shdw_pg_state.guest_cr3);
322 return handle_special_page_fault(info, fault_addr, fault_addr, error_code);
323 } else if (info->mem_mode == VIRTUAL_MEM) {
325 switch (info->cpu_mode) {
327 return handle_shadow_pagefault_32(info, fault_addr, error_code);
330 return handle_shadow_pagefault_32pae(info, fault_addr, error_code);
332 return handle_shadow_pagefault_64(info, fault_addr, error_code);
335 PrintError("Unhandled CPU Mode\n");
339 PrintError("Invalid Memory mode\n");
344 addr_t v3_create_new_shadow_pt() {
347 host_pde = V3_VAddr(V3_AllocPages(1));
348 memset(host_pde, 0, PAGE_SIZE);
350 return (addr_t)host_pde;
354 static void inject_guest_pf(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
355 info->ctrl_regs.cr2 = fault_addr;
356 v3_raise_exception_with_error(info, PF_EXCEPTION, *(uint_t *)&error_code);
360 static int is_guest_pf(pt_access_status_t guest_access, pt_access_status_t shadow_access) {
361 /* basically the reasoning is that there can be multiple reasons for a page fault:
362 If there is a permissions failure for a page present in the guest _BUT_
363 the reason for the fault was that the page is not present in the shadow,
364 _THEN_ we have to map the shadow page in and reexecute, this will generate
365 a permissions fault which is _THEN_ valid to send to the guest
366 _UNLESS_ both the guest and shadow have marked the page as not present
370 if (guest_access != PT_ACCESS_OK) {
371 // Guest Access Error
373 if ((shadow_access != PT_ACCESS_NOT_PRESENT) &&
374 (guest_access != PT_ACCESS_NOT_PRESENT)) {
375 // aka (guest permission error)
379 if ((shadow_access == PT_ACCESS_NOT_PRESENT) &&
380 (guest_access == PT_ACCESS_NOT_PRESENT)) {
381 // Page tables completely blank, handle guest first
385 // Otherwise we'll handle the guest fault later...?
397 * * 64 bit Page table fault handlers
402 static int handle_shadow_pagefault_64(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
403 pt_access_status_t guest_access;
404 pt_access_status_t shadow_access;
406 PrintDebug("64 bit shadow page fault\n");
408 ret = v3_check_guest_pt_32(info, info->shdw_pg_state.guest_cr3, fault_addr, error_code, &guest_access);
410 PrintDebug("Guest Access Check: %d (access=%d)\n", ret, guest_access);
412 ret = v3_check_host_pt_32(info->ctrl_regs.cr3, fault_addr, error_code, &shadow_access);
414 PrintDebug("Shadow Access Check: %d (access=%d)\n", ret, shadow_access);
417 PrintError("64 bit shadow paging not implemented\n");
425 * * 32 bit PAE Page table fault handlers
430 static int handle_shadow_pagefault_32pae(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
431 PrintError("32 bit PAE shadow paging not implemented\n");
444 * * 32 bit Page table fault handlers
448 static int handle_large_pagefault_32(struct guest_info * info,
449 addr_t fault_addr, pf_error_t error_code,
450 pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde);
452 static int handle_shadow_pte32_fault(struct guest_info * info,
454 pf_error_t error_code,
459 static int handle_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) {
460 pde32_t * guest_pd = NULL;
461 pde32_t * shadow_pd = CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
462 addr_t guest_cr3 = CR3_TO_PDE32_PA(info->shdw_pg_state.guest_cr3);
463 pt_access_status_t guest_pde_access;
464 pt_access_status_t shadow_pde_access;
465 pde32_t * guest_pde = NULL;
466 pde32_t * shadow_pde = (pde32_t *)&(shadow_pd[PDE32_INDEX(fault_addr)]);
468 PrintDebug("Shadow page fault handler: %p\n", (void*) fault_addr );
470 if (guest_pa_to_host_va(info, guest_cr3, (addr_t*)&guest_pd) == -1) {
471 PrintError("Invalid Guest PDE Address: 0x%p\n", (void *)guest_cr3);
475 guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(fault_addr)]);
478 // Check the guest page permissions
479 guest_pde_access = v3_can_access_pde32(guest_pd, fault_addr, error_code);
481 // Check the shadow page permissions
482 shadow_pde_access = v3_can_access_pde32(shadow_pd, fault_addr, error_code);
484 /* Was the page fault caused by the Guest's page tables? */
485 if (is_guest_pf(guest_pde_access, shadow_pde_access) == 1) {
486 PrintDebug("Injecting PDE pf to guest: (guest access error=%d) (pf error code=%d)\n",
487 *(uint_t *)&guest_pde_access, *(uint_t *)&error_code);
488 inject_guest_pf(info, fault_addr, error_code);
493 if (shadow_pde_access == PT_ACCESS_NOT_PRESENT)
495 pte32_t * shadow_pt = (pte32_t *)v3_create_new_shadow_pt();
497 shadow_pde->present = 1;
498 shadow_pde->user_page = guest_pde->user_page;
499 // shadow_pde->large_page = guest_pde->large_page;
500 shadow_pde->large_page = 0;
503 // VMM Specific options
504 shadow_pde->write_through = 0;
505 shadow_pde->cache_disable = 0;
506 shadow_pde->global_page = 0;
509 guest_pde->accessed = 1;
511 shadow_pde->pt_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(shadow_pt));
513 if (guest_pde->large_page == 0) {
514 shadow_pde->writable = guest_pde->writable;
516 // ?? What if guest pde is dirty a this point?
517 ((pde32_4MB_t *)guest_pde)->dirty = 0;
518 shadow_pde->writable = 0;
521 else if (shadow_pde_access == PT_ACCESS_OK)
526 pte32_t * shadow_pt = (pte32_t *)V3_VAddr( (void*)(addr_t) BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr) );
528 if (guest_pde->large_page == 0) {
529 pte32_t * guest_pt = NULL;
530 if (guest_pa_to_host_va(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t*)&guest_pt) == -1) {
531 // Machine check the guest
532 PrintDebug("Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr));
533 v3_raise_exception(info, MC_EXCEPTION);
537 if (handle_shadow_pte32_fault(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) {
538 PrintError("Error handling Page fault caused by PTE\n");
541 } else if (guest_pde->large_page == 1) {
542 if (handle_large_pagefault_32(info, fault_addr, error_code, shadow_pt, (pde32_4MB_t *)guest_pde) == -1) {
543 PrintError("Error handling large pagefault\n");
548 else if ((shadow_pde_access == PT_ACCESS_WRITE_ERROR) &&
549 (guest_pde->large_page == 1) &&
550 (((pde32_4MB_t *)guest_pde)->dirty == 0))
553 // Page Directory Entry marked read-only
554 // Its a large page and we need to update the dirty bit in the guest
557 PrintDebug("Large page write error... Setting dirty bit and returning\n");
558 ((pde32_4MB_t *)guest_pde)->dirty = 1;
559 shadow_pde->writable = guest_pde->writable;
563 else if (shadow_pde_access == PT_ACCESS_USER_ERROR)
566 // Page Directory Entry marked non-user
568 PrintDebug("Shadow Paging User access error (shadow_pde_access=0x%x, guest_pde_access=0x%x)\n",
569 shadow_pde_access, guest_pde_access);
570 inject_guest_pf(info, fault_addr, error_code);
575 // inject page fault in guest
576 inject_guest_pf(info, fault_addr, error_code);
577 PrintDebug("Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access);
578 PrintDebug("Manual Says to inject page fault into guest\n");
579 #ifdef DEBUG_SHADOW_PAGING
580 PrintDebug("Guest PDE: (access=%d)\n\t", guest_pde_access);
581 PrintPTEntry(PAGE_PD32, fault_addr, guest_pde);
582 PrintDebug("Shadow PDE: (access=%d)\n\t", shadow_pde_access);
583 PrintPTEntry(PAGE_PD32, fault_addr, shadow_pde);
589 PrintDebug("Returning end of PDE function (rip=%p)\n", (void *)(addr_t)(info->rip));
595 /* The guest status checks have already been done,
596 * only special case shadow checks remain
598 static int handle_large_pagefault_32(struct guest_info * info,
599 addr_t fault_addr, pf_error_t error_code,
600 pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde)
602 pt_access_status_t shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code);
603 pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]);
605 if (shadow_pte_access == PT_ACCESS_OK) {
606 // Inconsistent state...
607 // Guest Re-Entry will flush tables and everything should now workd
608 PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n");
613 if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
614 // Get the guest physical address of the fault
615 addr_t guest_fault_pa = BASE_TO_PAGE_ADDR_4MB(large_guest_pde->page_base_addr) + PAGE_OFFSET_4MB(fault_addr);
616 host_region_type_t host_page_type = get_shadow_addr_type(info, guest_fault_pa);
619 if (host_page_type == HOST_REGION_INVALID) {
620 // Inject a machine check in the guest
621 PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa);
622 v3_raise_exception(info, MC_EXCEPTION);
626 if (host_page_type == HOST_REGION_PHYSICAL_MEMORY) {
627 struct shadow_page_state * state = &(info->shdw_pg_state);
628 addr_t shadow_pa = get_shadow_addr(info, guest_fault_pa);
630 shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
632 shadow_pte->present = 1;
634 /* We are assuming that the PDE entry has precedence
635 * so the Shadow PDE will mirror the guest PDE settings,
636 * and we don't have to worry about them here
639 shadow_pte->user_page = 1;
641 if (find_pte_map(state->cached_ptes, PAGE_ADDR(guest_fault_pa)) != NULL) {
642 // Check if the entry is a page table...
643 PrintDebug("Marking page as Guest Page Table (large page)\n");
644 shadow_pte->vmm_info = PT32_GUEST_PT;
645 shadow_pte->writable = 0;
647 shadow_pte->writable = 1;
651 //set according to VMM policy
652 shadow_pte->write_through = 0;
653 shadow_pte->cache_disable = 0;
654 shadow_pte->global_page = 0;
658 // Handle hooked pages as well as other special pages
659 if (handle_special_page_fault(info, fault_addr, guest_fault_pa, error_code) == -1) {
660 PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr);
664 } else if ((shadow_pte_access == PT_ACCESS_WRITE_ERROR) &&
665 (shadow_pte->vmm_info == PT32_GUEST_PT)) {
667 struct shadow_page_state * state = &(info->shdw_pg_state);
668 PrintDebug("Write operation on Guest PAge Table Page (large page)\n");
669 state->cached_cr3 = 0;
670 shadow_pte->writable = 1;
673 PrintError("Error in large page fault handler...\n");
674 PrintError("This case should have been handled at the top level handler\n");
678 PrintDebug("Returning from large page fault handler\n");
686 * We assume the the guest pte pointer has already been translated to a host virtual address
688 static int handle_shadow_pte32_fault(struct guest_info * info,
690 pf_error_t error_code,
692 pte32_t * guest_pt) {
694 pt_access_status_t guest_pte_access;
695 pt_access_status_t shadow_pte_access;
696 pte32_t * guest_pte = (pte32_t *)&(guest_pt[PTE32_INDEX(fault_addr)]);;
697 pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]);
700 // Check the guest page permissions
701 guest_pte_access = v3_can_access_pte32(guest_pt, fault_addr, error_code);
703 // Check the shadow page permissions
704 shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code);
706 #ifdef DEBUG_SHADOW_PAGING
707 PrintDebug("Guest PTE: (access=%d)\n\t", guest_pte_access);
708 PrintPTEntry(PAGE_PT32, fault_addr, guest_pte);
709 PrintDebug("Shadow PTE: (access=%d)\n\t", shadow_pte_access);
710 PrintPTEntry(PAGE_PT32, fault_addr, shadow_pte);
713 /* Was the page fault caused by the Guest's page tables? */
714 if (is_guest_pf(guest_pte_access, shadow_pte_access) == 1) {
715 PrintDebug("Access error injecting pf to guest (guest access error=%d) (pf error code=%d)\n",
716 guest_pte_access, *(uint_t*)&error_code);
717 inject_guest_pf(info, fault_addr, error_code);
722 if (shadow_pte_access == PT_ACCESS_OK) {
723 // Inconsistent state...
724 // Guest Re-Entry will flush page tables and everything should now work
725 PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n");
730 if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) {
732 addr_t guest_pa = BASE_TO_PAGE_ADDR((addr_t)(guest_pte->page_base_addr)) + PAGE_OFFSET(fault_addr);
734 // Page Table Entry Not Present
735 PrintDebug("guest_pa =%p\n", (void *)guest_pa);
737 host_region_type_t host_page_type = get_shadow_addr_type(info, guest_pa);
739 if (host_page_type == HOST_REGION_INVALID) {
740 // Inject a machine check in the guest
741 PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_pa);
742 v3_raise_exception(info, MC_EXCEPTION);
748 if (host_page_type == HOST_REGION_PHYSICAL_MEMORY) {
749 struct shadow_page_state * state = &(info->shdw_pg_state);
750 addr_t shadow_pa = get_shadow_addr(info, guest_pa);
752 shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa);
754 shadow_pte->present = guest_pte->present;
755 shadow_pte->user_page = guest_pte->user_page;
757 //set according to VMM policy
758 shadow_pte->write_through = 0;
759 shadow_pte->cache_disable = 0;
760 shadow_pte->global_page = 0;
763 guest_pte->accessed = 1;
765 if (find_pte_map(state->cached_ptes, PAGE_ADDR(guest_pa)) != NULL) {
766 // Check if the entry is a page table...
767 PrintDebug("Marking page as Guest Page Table %d\n", shadow_pte->writable);
768 shadow_pte->vmm_info = PT32_GUEST_PT;
771 if (guest_pte->dirty == 1) {
772 shadow_pte->writable = guest_pte->writable;
773 } else if ((guest_pte->dirty == 0) && (error_code.write == 1)) {
774 shadow_pte->writable = guest_pte->writable;
775 guest_pte->dirty = 1;
777 if (shadow_pte->vmm_info == PT32_GUEST_PT) {
778 // Well that was quick...
779 struct shadow_page_state * state = &(info->shdw_pg_state);
780 PrintDebug("Immediate Write operation on Guest PAge Table Page\n");
781 state->cached_cr3 = 0;
784 } else if ((guest_pte->dirty == 0) && (error_code.write == 0)) { // was =
785 shadow_pte->writable = 0;
791 // Page fault handled by hook functions
792 if (handle_special_page_fault(info, fault_addr, guest_pa, error_code) == -1) {
793 PrintError("Special Page fault handler returned error for address: %p\n", (void *)fault_addr);
798 } else if ((shadow_pte_access == PT_ACCESS_WRITE_ERROR) &&
799 (guest_pte->dirty == 0)) {
801 PrintDebug("Shadow PTE Write Error\n");
802 guest_pte->dirty = 1;
803 shadow_pte->writable = guest_pte->writable;
805 if (shadow_pte->vmm_info == PT32_GUEST_PT) {
806 struct shadow_page_state * state = &(info->shdw_pg_state);
807 PrintDebug("Write operation on Guest PAge Table Page\n");
808 state->cached_cr3 = 0;
814 // Inject page fault into the guest
815 inject_guest_pf(info, fault_addr, error_code);
816 PrintError("PTE Page fault fell through... Not sure if this should ever happen\n");
817 PrintError("Manual Says to inject page fault into guest\n");
821 PrintDebug("Returning end of function\n");
830 /* Currently Does not work with Segmentation!!! */
831 int v3_handle_shadow_invlpg(struct guest_info * info)
833 if (info->mem_mode != VIRTUAL_MEM) {
834 // Paging must be turned on...
835 // should handle with some sort of fault I think
836 PrintError("ERROR: INVLPG called in non paged mode\n");
841 if (info->cpu_mode != PROTECTED) {
842 PrintError("Unsupported CPU mode (mode=%s)\n", v3_cpu_mode_to_str(info->cpu_mode));
849 int ret = read_guest_va_memory(info, get_addr_linear(info, info->rip, &(info->segments.cs)), 15, instr);
851 PrintError("Could not read instruction 0x%p (ret=%d)\n", (void *)(addr_t)(info->rip), ret);
856 /* Can INVLPG work with Segments?? */
857 while (is_prefix_byte(instr[index])) {
862 if( (instr[index + 0] != (uchar_t) 0x0f) ||
863 (instr[index + 1] != (uchar_t) 0x01) ) {
864 PrintError("invalid Instruction Opcode\n");
865 PrintTraceMemDump(instr, 15);
869 addr_t first_operand;
870 addr_t second_operand;
871 addr_t guest_cr3 = CR3_TO_PDE32_PA(info->shdw_pg_state.guest_cr3);
873 pde32_t * guest_pd = NULL;
875 if (guest_pa_to_host_va(info, guest_cr3, (addr_t*)&guest_pd) == -1) {
876 PrintError("Invalid Guest PDE Address: 0x%p\n", (void *)guest_cr3);
882 v3_operand_type_t addr_type = decode_operands32(&(info->vm_regs), instr + index, &index, &first_operand, &second_operand, REG32);
884 if (addr_type != MEM_OPERAND) {
885 PrintError("Invalid Operand type\n");
889 pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32_VA(info->ctrl_regs.cr3);
890 pde32_t * shadow_pde = (pde32_t *)&shadow_pd[PDE32_INDEX(first_operand)];
893 //PrintDebug("PDE Index=%d\n", PDE32_INDEX(first_operand));
894 //PrintDebug("FirstOperand = %x\n", first_operand);
896 PrintDebug("Invalidating page for %p\n", (void *)first_operand);
898 guest_pde = (pde32_t *)&(guest_pd[PDE32_INDEX(first_operand)]);
900 if (guest_pde->large_page == 1) {
901 shadow_pde->present = 0;
902 PrintDebug("Invalidating Large Page\n");
904 if (shadow_pde->present == 1) {
905 pte32_t * shadow_pt = (pte32_t *)(addr_t)BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr);
906 pte32_t * shadow_pte = (pte32_t *) V3_VAddr( (void*) &shadow_pt[PTE32_INDEX(first_operand)] );
908 #ifdef DEBUG_SHADOW_PAGING
909 PrintDebug("Setting not present\n");
910 PrintPTEntry(PAGE_PT32, first_operand, shadow_pte);
913 shadow_pte->present = 0;