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(vm, VCORE_NONE, "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(info->vm_info, info, "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(info->vm_info, info, "Error in MSR hook Write\n");
73 PrintError(info->vm_info, info, "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(info->vm_info, info, "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(core->vm_info, core, "Palacios: Unhandled MSR Read (MSR=0x%x) - returning zero\n", msr);
113 #ifdef V3_CONFIG_STRICT_MSR_SEMANTICS
114 v3_raise_exception(core,GPF_EXCEPTION);
122 int v3_msr_unhandled_write(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data) {
123 V3_Print(core->vm_info, core, "Palacios: Unhandled MSR Write (MSR=0x%x) - ignored\n", msr);
125 #ifdef V3_CONFIG_STRICT_MSR_SEMANTICS
126 v3_raise_exception(core,GPF_EXCEPTION);
135 int v3_hook_msr(struct v3_vm_info * vm, uint32_t msr,
136 int (*read)(struct guest_info * core, uint32_t msr, struct v3_msr * dst, void * priv_data),
137 int (*write)(struct guest_info * core, uint32_t msr, struct v3_msr src, void * priv_data),
140 struct v3_msr_map * msr_map = &(vm->msr_map);
141 struct v3_msr_hook * hook = NULL;
143 hook = (struct v3_msr_hook *)V3_Malloc(sizeof(struct v3_msr_hook));
146 PrintError(vm, VCORE_NONE,"Could not allocate msr hook for MSR 0x%x\n", msr);
153 hook->priv_data = priv_data;
155 msr_map->num_hooks++;
157 list_add(&(hook->link), &(msr_map->hook_list));
159 if (msr_map->update_map) {
160 msr_map->update_map(vm, msr,
161 (read == NULL) ? 0 : 1,
162 (write == NULL) ? 0 : 1);
172 static int free_hook(struct v3_vm_info * vm, struct v3_msr_hook * hook) {
173 list_del(&(hook->link));
175 if (vm->msr_map.update_map) {
176 vm->msr_map.update_map(vm, hook->msr, 0, 0);
185 int v3_unhook_msr(struct v3_vm_info * vm, uint32_t msr) {
186 struct v3_msr_hook * hook = v3_get_msr_hook(vm, msr);
189 PrintError(vm, VCORE_NONE,"Could not find MSR to unhook %u (0x%x)\n", msr, msr);
200 struct v3_msr_hook * v3_get_msr_hook(struct v3_vm_info * vm, uint32_t msr) {
201 struct v3_msr_map * msr_map = &(vm->msr_map);
202 struct v3_msr_hook * hook = NULL;
204 list_for_each_entry(hook, &(msr_map->hook_list), link) {
205 if (hook->msr == msr) {
214 void v3_refresh_msr_map(struct v3_vm_info * vm) {
215 struct v3_msr_map * msr_map = &(vm->msr_map);
216 struct v3_msr_hook * hook = NULL;
218 if (msr_map->update_map == NULL) {
219 PrintError(vm, VCORE_NONE, "Trying to refresh an MSR map with no backend\n");
223 list_for_each_entry(hook, &(msr_map->hook_list), link) {
224 PrintDebug(vm, VCORE_NONE, "updating MSR map for msr 0x%x\n", hook->msr);
225 msr_map->update_map(vm, hook->msr,
226 (hook->read == NULL) ? 0 : 1,
227 (hook->write == NULL) ? 0 : 1);
231 void v3_print_msr_map(struct v3_vm_info * vm) {
232 struct v3_msr_map * msr_map = &(vm->msr_map);
233 struct v3_msr_hook * hook = NULL;
235 list_for_each_entry(hook, &(msr_map->hook_list), link) {
236 V3_Print(vm, VCORE_NONE, "MSR HOOK (MSR=0x%x) (read=0x%p) (write=0x%p)\n",
237 hook->msr, hook->read, hook->write);