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_msr.h>
22 #include <palacios/vmm.h>
23 #include <palacios/vm_guest.h>
25 static int free_hook(struct v3_vm_info * vm, struct v3_msr_hook * hook);
27 void v3_init_msr_map(struct v3_vm_info * vm) {
28 struct v3_msr_map * msr_map = &(vm->msr_map);
30 PrintDebug("Initializing MSR map.\n");
32 INIT_LIST_HEAD(&(msr_map->hook_list));
33 msr_map->num_hooks = 0;
35 msr_map->arch_data = NULL;
36 msr_map->update_map = NULL;
39 int v3_deinit_msr_map(struct v3_vm_info * vm) {
40 struct v3_msr_hook * hook = NULL;
41 struct v3_msr_hook * tmp = NULL;
43 list_for_each_entry_safe(hook, tmp, &(vm->msr_map.hook_list), link) {
50 int v3_handle_msr_write(struct guest_info * info) {
51 uint32_t msr_num = info->vm_regs.rcx;
52 struct v3_msr msr_val;
53 struct v3_msr_hook * hook = NULL;
57 PrintDebug("MSR write for msr 0x%x\n", msr_num);
59 hook = v3_get_msr_hook(info->vm_info, msr_num);
62 v3_msr_unhandled_write(info, msr_num, msr_val, NULL);
64 msr_val.lo = info->vm_regs.rax;
65 msr_val.hi = info->vm_regs.rdx;
68 if (hook->write(info, msr_num, msr_val, hook->priv_data) == -1) {
69 PrintError("Error in MSR hook Write\n");
73 PrintError("No write hook exists for msr 0x%x\n",msr_num);
83 int v3_handle_msr_read(struct guest_info * info) {
84 uint32_t msr_num = info->vm_regs.rcx;
85 struct v3_msr msr_val;
86 struct v3_msr_hook * hook = NULL;
90 hook = v3_get_msr_hook(info->vm_info, msr_num);
93 v3_msr_unhandled_read(info, msr_num, &msr_val, NULL);
95 if (hook->read(info, msr_num, &msr_val, hook->priv_data) == -1) {
96 PrintError("Error in MSR hook Read\n");
101 info->vm_regs.rax = msr_val.lo;
102 info->vm_regs.rdx = msr_val.hi;
110 int v3_msr_unhandled_read(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data) {
111 V3_Print("Palacios: Unhandled MSR Read (MSR=0x%x)\n", msr);
115 int v3_msr_unhandled_write(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data) {
116 V3_Print("Palacios: Unhandled MSR Write (MSR=0x%x)\n", msr);
121 int v3_hook_msr(struct v3_vm_info * vm, uint32_t msr,
122 int (*read)(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data),
123 int (*write)(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data),
126 struct v3_msr_map * msr_map = &(vm->msr_map);
127 struct v3_msr_hook * hook = NULL;
129 hook = (struct v3_msr_hook *)V3_Malloc(sizeof(struct v3_msr_hook));
132 PrintError("Could not allocate msr hook for MSR 0x%x\n", msr);
139 hook->priv_data = priv_data;
141 msr_map->num_hooks++;
143 list_add(&(hook->link), &(msr_map->hook_list));
145 if (msr_map->update_map) {
146 msr_map->update_map(vm, msr,
147 (read == NULL) ? 0 : 1,
148 (write == NULL) ? 0 : 1);
158 static int free_hook(struct v3_vm_info * vm, struct v3_msr_hook * hook) {
159 list_del(&(hook->link));
161 if (vm->msr_map.update_map) {
162 vm->msr_map.update_map(vm, hook->msr, 0, 0);
171 int v3_unhook_msr(struct v3_vm_info * vm, uint32_t msr) {
172 struct v3_msr_hook * hook = v3_get_msr_hook(vm, msr);
175 PrintError("Could not find MSR to unhook %u (0x%x)\n", msr, msr);
186 struct v3_msr_hook * v3_get_msr_hook(struct v3_vm_info * vm, uint32_t msr) {
187 struct v3_msr_map * msr_map = &(vm->msr_map);
188 struct v3_msr_hook * hook = NULL;
190 list_for_each_entry(hook, &(msr_map->hook_list), link) {
191 if (hook->msr == msr) {
200 void v3_refresh_msr_map(struct v3_vm_info * vm) {
201 struct v3_msr_map * msr_map = &(vm->msr_map);
202 struct v3_msr_hook * hook = NULL;
204 if (msr_map->update_map == NULL) {
205 PrintError("Trying to refresh an MSR map with no backend\n");
209 list_for_each_entry(hook, &(msr_map->hook_list), link) {
210 PrintDebug("updating MSR map for msr 0x%x\n", hook->msr);
211 msr_map->update_map(vm, hook->msr,
212 (hook->read == NULL) ? 0 : 1,
213 (hook->write == NULL) ? 0 : 1);
217 void v3_print_msr_map(struct v3_vm_info * vm) {
218 struct v3_msr_map * msr_map = &(vm->msr_map);
219 struct v3_msr_hook * hook = NULL;
221 list_for_each_entry(hook, &(msr_map->hook_list), link) {
222 V3_Print("MSR HOOK (MSR=0x%x) (read=0x%p) (write=0x%p)\n",
223 hook->msr, hook->read, hook->write);