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".
20 #include <palacios/vmm.h>
21 #include <palacios/vm_guest.h>
22 #include <palacios/vmm_mem_hook.h>
23 #include <palacios/vmm_emulator.h>
24 #include <palacios/vm_guest_mem.h>
28 // Called when data is read from a memory page
29 int (*read)(struct guest_info * core, addr_t guest_addr, void * dst, uint_t length, void * priv_data);
30 // Called when data is written to a memory page
31 int (*write)(struct guest_info * core, addr_t guest_addr, void * src, uint_t length, void * priv_data);
35 struct v3_mem_region * region;
37 struct list_head hook_node;
42 static int free_hook(struct v3_vm_info * vm, struct mem_hook * hook);
45 int v3_init_mem_hooks(struct v3_vm_info * vm) {
46 struct v3_mem_hooks * hooks = &(vm->mem_hooks);
48 hooks->hook_hvas = V3_VAddr(V3_AllocPages(vm->num_cores));
50 INIT_LIST_HEAD(&(hooks->hook_list));
56 // We'll assume the actual hooks were either already cleared,
57 // or will be cleared by the memory map
58 int v3_deinit_mem_hooks(struct v3_vm_info * vm) {
59 struct v3_mem_hooks * hooks = &(vm->mem_hooks);
60 struct mem_hook * hook = NULL;
61 struct mem_hook * tmp = NULL;
65 // We delete the hook info but leave its memory region intact
66 // We rely on the memory map to clean up any orphaned regions as a result of this
67 // This needs to be fixed at some point...
68 list_for_each_entry_safe(hook, tmp, &(hooks->hook_list), hook_node) {
73 V3_FreePages(V3_PAddr(hooks->hook_hvas), vm->num_cores);
81 static int handle_mem_hook(struct guest_info * info, addr_t guest_va, addr_t guest_pa,
82 struct v3_mem_region * reg, pf_error_t access_info) {
83 struct mem_hook * hook = reg->priv_data;
84 struct v3_mem_hooks * hooks = &(info->vm_info->mem_hooks);
87 if (reg->flags.alloced == 0) {
88 if (hook->hook_hva & 0xfff) {
89 op_addr = (addr_t)(hooks->hook_hvas + (PAGE_SIZE * info->cpu_id));
91 op_addr = hook->hook_hva;
94 if (v3_gpa_to_hva(info, guest_pa, &op_addr) == -1) {
95 PrintError("Could not translate hook address (%p)\n", (void *)guest_pa);
101 if (access_info.write == 1) {
103 if (v3_emulate_write_op(info, guest_va, guest_pa, op_addr,
104 hook->write, hook->priv_data) == -1) {
105 PrintError("Write Full Hook emulation failed\n");
111 if (reg->flags.read == 1) {
112 PrintError("Tried to emulate read for a guest Readable page\n");
116 if (v3_emulate_read_op(info, guest_va, guest_pa, op_addr,
117 hook->read, hook->write,
118 hook->priv_data) == -1) {
119 PrintError("Read Full Hook emulation failed\n");
132 int v3_hook_write_mem(struct v3_vm_info * vm, uint16_t core_id,
133 addr_t guest_addr_start, addr_t guest_addr_end, addr_t host_addr,
134 int (*write)(struct guest_info * core, addr_t guest_addr, void * src, uint_t length, void * priv_data),
136 struct v3_mem_region * entry = NULL;
137 struct mem_hook * hook = V3_Malloc(sizeof(struct mem_hook));
138 struct v3_mem_hooks * hooks = &(vm->mem_hooks);
140 memset(hook, 0, sizeof(struct mem_hook));
144 hook->priv_data = priv_data;
145 hook->hook_hva = (addr_t)V3_VAddr((void *)host_addr);
147 entry = v3_create_mem_region(vm, core_id, guest_addr_start, guest_addr_end);
149 hook->region = entry;
151 entry->host_addr = host_addr;
152 entry->unhandled = handle_mem_hook;
153 entry->priv_data = hook;
155 entry->flags.read = 1;
156 entry->flags.exec = 1;
157 entry->flags.alloced = 1;
159 if (v3_insert_mem_region(vm, entry) == -1) {
165 list_add(&(hook->hook_node), &(hooks->hook_list));
172 int v3_hook_full_mem(struct v3_vm_info * vm, uint16_t core_id,
173 addr_t guest_addr_start, addr_t guest_addr_end,
174 int (*read)(struct guest_info * core, addr_t guest_addr, void * dst, uint_t length, void * priv_data),
175 int (*write)(struct guest_info * core, addr_t guest_addr, void * src, uint_t length, void * priv_data),
178 struct v3_mem_region * entry = NULL;
179 struct mem_hook * hook = V3_Malloc(sizeof(struct mem_hook));
180 struct v3_mem_hooks * hooks = &(vm->mem_hooks);
182 memset(hook, 0, sizeof(struct mem_hook));
186 hook->priv_data = priv_data;
187 hook->hook_hva = (addr_t)0xfff;
189 entry = v3_create_mem_region(vm, core_id, guest_addr_start, guest_addr_end);
190 hook->region = entry;
192 entry->unhandled = handle_mem_hook;
193 entry->priv_data = hook;
195 if (v3_insert_mem_region(vm, entry)) {
201 list_add(&(hook->hook_node), &(hooks->hook_list));
208 static int free_hook(struct v3_vm_info * vm, struct mem_hook * hook) {
209 v3_delete_mem_region(vm, hook->region);
210 list_del(&(hook->hook_node));
218 // This will unhook the memory hook registered at start address
219 // We do not support unhooking subregions
220 int v3_unhook_mem(struct v3_vm_info * vm, uint16_t core_id, addr_t guest_addr_start) {
221 struct v3_mem_region * reg = v3_get_mem_region(vm, core_id, guest_addr_start);
222 struct mem_hook * hook = reg->priv_data;