--- /dev/null
+/*
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National
+ * Science Foundation and the Department of Energy.
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico. You can find out more at
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
+ * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
+ * All rights reserved.
+ *
+ * Author: Jack Lange <jarusl@cs.northwestern.edu>
+ *
+ * This is free software. You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+#include <palacios/vmm_paging.h>
+
+#include <palacios/vmm.h>
+
+#include <palacios/vm_guest_mem.h>
+
+
+
+
+
+
+
+void delete_page_tables_pde32(pde32_t * pde) {
+ int i;//, j;
+
+ if (pde == NULL) {
+ return;
+ }
+
+ for (i = 0; (i < MAX_PDE32_ENTRIES); i++) {
+ if (pde[i].present) {
+ // We double cast, first to an addr_t to handle 64 bit issues, then to the pointer
+ PrintDebug("PTE base addr %x \n", pde[i].pt_base_addr);
+ pte32_t * pte = (pte32_t *)((addr_t)(uint_t)(pde[i].pt_base_addr << PAGE_POWER));
+
+ /*
+ for (j = 0; (j < MAX_PTE32_ENTRIES); j++) {
+ if ((pte[j].present)) {
+ os_hooks->free_page((void *)(pte[j].page_base_addr << PAGE_POWER));
+ }
+ }
+ */
+ PrintDebug("Deleting PTE %d (%p)\n", i, pte);
+ V3_FreePage(pte);
+ }
+ }
+
+ PrintDebug("Deleting PDE (%p)\n", pde);
+ V3_FreePage(V3_PAddr(pde));
+}
+
+
+
+
+
+int pt32_lookup(pde32_t * pd, addr_t vaddr, addr_t * paddr) {
+ addr_t pde_entry;
+ pde32_entry_type_t pde_entry_type;
+
+ if (pd == 0) {
+ return -1;
+ }
+
+ pde_entry_type = pde32_lookup(pd, vaddr, &pde_entry);
+
+ if (pde_entry_type == PDE32_ENTRY_PTE32) {
+ return pte32_lookup((pte32_t *)pde_entry, vaddr, paddr);
+ } else if (pde_entry_type == PDE32_ENTRY_LARGE_PAGE) {
+ *paddr = pde_entry;
+ return 0;
+ }
+
+ return -1;
+}
+
+
+
+/* We can't do a full lookup because we don't know what context the page tables are in...
+ * The entry addresses could be pointing to either guest physical memory or host physical memory
+ * Instead we just return the entry address, and a flag to show if it points to a pte or a large page...
+ */
+pde32_entry_type_t pde32_lookup(pde32_t * pd, addr_t addr, addr_t * entry) {
+ pde32_t * pde_entry = &(pd[PDE32_INDEX(addr)]);
+
+ if (!pde_entry->present) {
+ *entry = 0;
+ return PDE32_ENTRY_NOT_PRESENT;
+ } else {
+
+ if (pde_entry->large_page) {
+ pde32_4MB_t * large_pde = (pde32_4MB_t *)pde_entry;
+
+ *entry = PDE32_4MB_T_ADDR(*large_pde);
+ *entry += PD32_4MB_PAGE_OFFSET(addr);
+ return PDE32_ENTRY_LARGE_PAGE;
+ } else {
+ *entry = PDE32_T_ADDR(*pde_entry);
+ return PDE32_ENTRY_PTE32;
+ }
+ }
+ return PDE32_ENTRY_NOT_PRESENT;
+}
+
+
+
+/* Takes a virtual addr (addr) and returns the physical addr (entry) as defined in the page table
+ */
+int pte32_lookup(pte32_t * pt, addr_t addr, addr_t * entry) {
+ pte32_t * pte_entry = &(pt[PTE32_INDEX(addr)]);
+
+ if (!pte_entry->present) {
+ *entry = 0;
+ PrintDebug("Lookup at non present page (index=%d)\n", PTE32_INDEX(addr));
+ return -1;
+ } else {
+ *entry = PTE32_T_ADDR(*pte_entry) + PT32_PAGE_OFFSET(addr);
+ return 0;
+ }
+
+ return -1;
+}
+
+
+
+pt_access_status_t can_access_pde32(pde32_t * pde, addr_t addr, pf_error_t access_type) {
+ pde32_t * entry = &pde[PDE32_INDEX(addr)];
+
+ if (entry->present == 0) {
+ return PT_ENTRY_NOT_PRESENT;
+ } else if ((entry->writable == 0) && (access_type.write == 1)) {
+ return PT_WRITE_ERROR;
+ } else if ((entry->user_page == 0) && (access_type.user == 1)) {
+ // Check CR0.WP?
+ return PT_USER_ERROR;
+ }
+
+ return PT_ACCESS_OK;
+}
+
+
+pt_access_status_t can_access_pte32(pte32_t * pte, addr_t addr, pf_error_t access_type) {
+ pte32_t * entry = &pte[PTE32_INDEX(addr)];
+
+ if (entry->present == 0) {
+ return PT_ENTRY_NOT_PRESENT;
+ } else if ((entry->writable == 0) && (access_type.write == 1)) {
+ return PT_WRITE_ERROR;
+ } else if ((entry->user_page == 0) && (access_type.user == 1)) {
+ // Check CR0.WP?
+ return PT_USER_ERROR;
+ }
+
+ return PT_ACCESS_OK;
+}
+
+
+
+
+/* We generate a page table to correspond to a given memory layout
+ * pulling pages from the mem_list when necessary
+ * If there are any gaps in the layout, we add them as unmapped pages
+ */
+pde32_t * create_passthrough_pts_32(struct guest_info * guest_info) {
+ addr_t current_page_addr = 0;
+ int i, j;
+ struct shadow_map * map = &(guest_info->mem_map);
+
+ pde32_t * pde = V3_VAddr(V3_AllocPages(1));
+
+ for (i = 0; i < MAX_PDE32_ENTRIES; i++) {
+ int pte_present = 0;
+ pte32_t * pte = V3_VAddr(V3_AllocPages(1));
+
+
+ for (j = 0; j < MAX_PTE32_ENTRIES; j++) {
+ struct shadow_region * region = get_shadow_region_by_addr(map, current_page_addr);
+
+ if (!region ||
+ (region->host_type == HOST_REGION_HOOK) ||
+ (region->host_type == HOST_REGION_UNALLOCATED) ||
+ (region->host_type == HOST_REGION_MEMORY_MAPPED_DEVICE) ||
+ (region->host_type == HOST_REGION_REMOTE) ||
+ (region->host_type == HOST_REGION_SWAPPED)) {
+ pte[j].present = 0;
+ pte[j].writable = 0;
+ pte[j].user_page = 0;
+ pte[j].write_through = 0;
+ pte[j].cache_disable = 0;
+ pte[j].accessed = 0;
+ pte[j].dirty = 0;
+ pte[j].pte_attr = 0;
+ pte[j].global_page = 0;
+ pte[j].vmm_info = 0;
+ pte[j].page_base_addr = 0;
+ } else {
+ addr_t host_addr;
+ pte[j].present = 1;
+ pte[j].writable = 1;
+ pte[j].user_page = 1;
+ pte[j].write_through = 0;
+ pte[j].cache_disable = 0;
+ pte[j].accessed = 0;
+ pte[j].dirty = 0;
+ pte[j].pte_attr = 0;
+ pte[j].global_page = 0;
+ pte[j].vmm_info = 0;
+
+ if (guest_pa_to_host_pa(guest_info, current_page_addr, &host_addr) == -1) {
+ // BIG ERROR
+ // PANIC
+ return NULL;
+ }
+
+ pte[j].page_base_addr = host_addr >> 12;
+
+ pte_present = 1;
+ }
+
+ current_page_addr += PAGE_SIZE;
+ }
+
+ if (pte_present == 0) {
+ V3_FreePage(V3_PAddr(pte));
+
+ pde[i].present = 0;
+ pde[i].writable = 0;
+ pde[i].user_page = 0;
+ pde[i].write_through = 0;
+ pde[i].cache_disable = 0;
+ pde[i].accessed = 0;
+ pde[i].reserved = 0;
+ pde[i].large_page = 0;
+ pde[i].global_page = 0;
+ pde[i].vmm_info = 0;
+ pde[i].pt_base_addr = 0;
+ } else {
+ pde[i].present = 1;
+ pde[i].writable = 1;
+ pde[i].user_page = 1;
+ pde[i].write_through = 0;
+ pde[i].cache_disable = 0;
+ pde[i].accessed = 0;
+ pde[i].reserved = 0;
+ pde[i].large_page = 0;
+ pde[i].global_page = 0;
+ pde[i].vmm_info = 0;
+ pde[i].pt_base_addr = PAGE_ALIGNED_ADDR((addr_t)V3_PAddr(pte));
+ }
+
+ }
+
+ return pde;
+}
+
+
+
+
+pml4e64_t * create_passthrough_pts_64(struct guest_info * info) {
+ addr_t current_page_addr = 0;
+ int i, j, k, m;
+ struct shadow_map * map = &(info->mem_map);
+
+ pml4e64_t * pml = V3_VAddr(V3_AllocPages(1));
+
+ for (i = 0; i < 1; i++) {
+ int pdpe_present = 0;
+ pdpe64_t * pdpe = V3_VAddr(V3_AllocPages(1));
+
+ for (j = 0; j < 1; j++) {
+ int pde_present = 0;
+ pde64_t * pde = V3_VAddr(V3_AllocPages(1));
+
+ for (k = 0; k < MAX_PDE64_ENTRIES; k++) {
+ int pte_present = 0;
+ pte64_t * pte = V3_VAddr(V3_AllocPages(1));
+
+
+ for (m = 0; m < MAX_PTE64_ENTRIES; m++) {
+ struct shadow_region * region = get_shadow_region_by_addr(map, current_page_addr);
+
+
+
+ if (!region ||
+ (region->host_type == HOST_REGION_HOOK) ||
+ (region->host_type == HOST_REGION_UNALLOCATED) ||
+ (region->host_type == HOST_REGION_MEMORY_MAPPED_DEVICE) ||
+ (region->host_type == HOST_REGION_REMOTE) ||
+ (region->host_type == HOST_REGION_SWAPPED)) {
+ pte[m].present = 0;
+ pte[m].writable = 0;
+ pte[m].user_page = 0;
+ pte[m].write_through = 0;
+ pte[m].cache_disable = 0;
+ pte[m].accessed = 0;
+ pte[m].dirty = 0;
+ pte[m].pte_attr = 0;
+ pte[m].global_page = 0;
+ pte[m].vmm_info = 0;
+ pte[m].page_base_addr = 0;
+ } else {
+ addr_t host_addr;
+ pte[m].present = 1;
+ pte[m].writable = 1;
+ pte[m].user_page = 1;
+ pte[m].write_through = 0;
+ pte[m].cache_disable = 0;
+ pte[m].accessed = 0;
+ pte[m].dirty = 0;
+ pte[m].pte_attr = 0;
+ pte[m].global_page = 0;
+ pte[m].vmm_info = 0;
+
+ if (guest_pa_to_host_pa(info, current_page_addr, &host_addr) == -1) {
+ // BIG ERROR
+ // PANIC
+ return NULL;
+ }
+
+ pte[m].page_base_addr = PTE64_BASE_ADDR(host_addr);
+
+ //PrintPTE64(current_page_addr, &(pte[m]));
+
+ pte_present = 1;
+ }
+
+
+
+
+ current_page_addr += PAGE_SIZE;
+ }
+
+ if (pte_present == 0) {
+ V3_FreePage(V3_PAddr(pte));
+
+ pde[k].present = 0;
+ pde[k].writable = 0;
+ pde[k].user_page = 0;
+ pde[k].write_through = 0;
+ pde[k].cache_disable = 0;
+ pde[k].accessed = 0;
+ pde[k].reserved = 0;
+ pde[k].large_page = 0;
+ //pde[k].global_page = 0;
+ pde[k].vmm_info = 0;
+ pde[k].pt_base_addr = 0;
+ } else {
+ pde[k].present = 1;
+ pde[k].writable = 1;
+ pde[k].user_page = 1;
+ pde[k].write_through = 0;
+ pde[k].cache_disable = 0;
+ pde[k].accessed = 0;
+ pde[k].reserved = 0;
+ pde[k].large_page = 0;
+ //pde[k].global_page = 0;
+ pde[k].vmm_info = 0;
+ pde[k].pt_base_addr = PAGE_ALIGNED_ADDR((addr_t)V3_PAddr(pte));
+
+ pde_present = 1;
+ }
+ }
+
+ if (pde_present == 0) {
+ V3_FreePage(V3_PAddr(pde));
+
+ pdpe[j].present = 0;
+ pdpe[j].writable = 0;
+ pdpe[j].user_page = 0;
+ pdpe[j].write_through = 0;
+ pdpe[j].cache_disable = 0;
+ pdpe[j].accessed = 0;
+ pdpe[j].reserved = 0;
+ pdpe[j].large_page = 0;
+ //pdpe[j].global_page = 0;
+ pdpe[j].vmm_info = 0;
+ pdpe[j].pd_base_addr = 0;
+ } else {
+ pdpe[j].present = 1;
+ pdpe[j].writable = 1;
+ pdpe[j].user_page = 1;
+ pdpe[j].write_through = 0;
+ pdpe[j].cache_disable = 0;
+ pdpe[j].accessed = 0;
+ pdpe[j].reserved = 0;
+ pdpe[j].large_page = 0;
+ //pdpe[j].global_page = 0;
+ pdpe[j].vmm_info = 0;
+ pdpe[j].pd_base_addr = PAGE_ALIGNED_ADDR((addr_t)V3_PAddr(pde));
+
+
+ pdpe_present = 1;
+ }
+
+ }
+
+ PrintDebug("PML index=%d\n", i);
+
+ if (pdpe_present == 0) {
+ V3_FreePage(V3_PAddr(pdpe));
+
+ pml[i].present = 0;
+ pml[i].writable = 0;
+ pml[i].user_page = 0;
+ pml[i].write_through = 0;
+ pml[i].cache_disable = 0;
+ pml[i].accessed = 0;
+ pml[i].reserved = 0;
+ //pml[i].large_page = 0;
+ //pml[i].global_page = 0;
+ pml[i].vmm_info = 0;
+ pml[i].pdp_base_addr = 0;
+ } else {
+ pml[i].present = 1;
+ pml[i].writable = 1;
+ pml[i].user_page = 1;
+ pml[i].write_through = 0;
+ pml[i].cache_disable = 0;
+ pml[i].accessed = 0;
+ pml[i].reserved = 0;
+ //pml[i].large_page = 0;
+ //pml[i].global_page = 0;
+ pml[i].vmm_info = 0;
+ pml[i].pdp_base_addr = PAGE_ALIGNED_ADDR((addr_t)V3_PAddr(pdpe));
+ }
+ }
+
+ return pml;
+}
+
+
+
+
+
+void PrintPDE32(addr_t virtual_address, pde32_t * pde)
+{
+ PrintDebug("PDE %p -> %p : present=%x, writable=%x, user=%x, wt=%x, cd=%x, accessed=%x, reserved=%x, largePages=%x, globalPage=%x, kernelInfo=%x\n",
+ (void *)virtual_address,
+ (void *)(addr_t) (pde->pt_base_addr << PAGE_POWER),
+ pde->present,
+ pde->writable,
+ pde->user_page,
+ pde->write_through,
+ pde->cache_disable,
+ pde->accessed,
+ pde->reserved,
+ pde->large_page,
+ pde->global_page,
+ pde->vmm_info);
+}
+
+
+void PrintPTE32(addr_t virtual_address, pte32_t * pte)
+{
+ PrintDebug("PTE %p -> %p : present=%x, writable=%x, user=%x, wt=%x, cd=%x, accessed=%x, dirty=%x, pteAttribute=%x, globalPage=%x, vmm_info=%x\n",
+ (void *)virtual_address,
+ (void*)(addr_t)(pte->page_base_addr << PAGE_POWER),
+ pte->present,
+ pte->writable,
+ pte->user_page,
+ pte->write_through,
+ pte->cache_disable,
+ pte->accessed,
+ pte->dirty,
+ pte->pte_attr,
+ pte->global_page,
+ pte->vmm_info);
+}
+
+
+void PrintPDE64(addr_t virtual_address, pde64_t * pde)
+{
+ PrintDebug("PDE64 %p -> %p : present=%x, writable=%x, user=%x, wt=%x, cd=%x, accessed=%x, reserved=%x, largePages=%x, globalPage=%x, kernelInfo=%x\n",
+ (void *)virtual_address,
+ (void *)(addr_t) (pde->pt_base_addr << PAGE_POWER),
+ pde->present,
+ pde->writable,
+ pde->user_page,
+ pde->write_through,
+ pde->cache_disable,
+ pde->accessed,
+ pde->reserved,
+ pde->large_page,
+ 0,//pde->global_page,
+ pde->vmm_info);
+}
+
+
+void PrintPTE64(addr_t virtual_address, pte64_t * pte)
+{
+ PrintDebug("PTE64 %p -> %p : present=%x, writable=%x, user=%x, wt=%x, cd=%x, accessed=%x, dirty=%x, pteAttribute=%x, globalPage=%x, vmm_info=%x\n",
+ (void *)virtual_address,
+ (void*)(addr_t)(pte->page_base_addr << PAGE_POWER),
+ pte->present,
+ pte->writable,
+ pte->user_page,
+ pte->write_through,
+ pte->cache_disable,
+ pte->accessed,
+ pte->dirty,
+ pte->pte_attr,
+ pte->global_page,
+ pte->vmm_info);
+}
+
+
+
+
+
+
+void PrintPD32(pde32_t * pde)
+{
+ int i;
+
+ PrintDebug("Page Directory at %p:\n", pde);
+ for (i = 0; (i < MAX_PDE32_ENTRIES); i++) {
+ if ( pde[i].present) {
+ PrintPDE32((addr_t)(PAGE_SIZE * MAX_PTE32_ENTRIES * i), &(pde[i]));
+ }
+ }
+}
+
+void PrintPT32(addr_t starting_address, pte32_t * pte)
+{
+ int i;
+
+ PrintDebug("Page Table at %p:\n", pte);
+ for (i = 0; (i < MAX_PTE32_ENTRIES) ; i++) {
+ if (pte[i].present) {
+ PrintPTE32(starting_address + (PAGE_SIZE * i), &(pte[i]));
+ }
+ }
+}
+
+
+
+
+
+void PrintDebugPageTables(pde32_t * pde)
+{
+ int i;
+
+ PrintDebug("Dumping the pages starting with the pde page at %p\n", pde);
+
+ for (i = 0; (i < MAX_PDE32_ENTRIES); i++) {
+ if (pde[i].present) {
+ PrintPDE32((addr_t)(PAGE_SIZE * MAX_PTE32_ENTRIES * i), &(pde[i]));
+ PrintPT32((addr_t)(PAGE_SIZE * MAX_PTE32_ENTRIES * i), (pte32_t *)V3_VAddr((void *)(addr_t)(pde[i].pt_base_addr << PAGE_POWER)));
+ }
+ }
+}
+
