3 * This file is part of the Palacios Virtual Machine Monitor developed
4 * by the V3VEE Project with funding from the United States National
5 * Science Foundation and the Department of Energy.
7 * The V3VEE Project is a joint project between Northwestern University
8 * and the University of New Mexico. You can find out more at
11 * Copyright (c) 2008, Andy Gocke <agocke@gmail.com>
12 * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
13 * All rights reserved.
15 * Author: Andy Gocke <agocke@gmail.com>
17 * This is free software. You are permitted to use,
18 * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
21 #include <palacios/vmx_ctrl_regs.h>
22 #include <palacios/vmm.h>
23 #include <palacios/vmx_lowlevel.h>
24 #include <palacios/vmx.h>
25 #include <palacios/vmx_assist.h>
26 #include <palacios/vm_guest_mem.h>
27 #include <palacios/vmm_direct_paging.h>
28 #include <palacios/vmm_ctrl_regs.h>
30 static v3_reg_t * get_reg_ptr(struct guest_info * info, struct vmx_exit_cr_qual * cr_qual);
31 static int handle_mov_to_cr0(struct guest_info * info, v3_reg_t * new_val, struct vmx_exit_info * exit_info);
32 static int handle_mov_to_cr3(struct guest_info * info, v3_reg_t * cr3_reg);
33 static int handle_mov_from_cr3(struct guest_info * info, v3_reg_t * cr3_reg);
35 int v3_vmx_handle_cr0_access(struct guest_info * info, struct vmx_exit_cr_qual * cr_qual, struct vmx_exit_info * exit_info) {
37 if (cr_qual->access_type < 2) {
38 v3_reg_t * reg = get_reg_ptr(info, cr_qual);
40 if (cr_qual->access_type == 0) {
42 if (handle_mov_to_cr0(info, reg, exit_info) != 0) {
43 PrintError("Could not handle CR0 write\n");
48 PrintError("Mov From CR0 not handled\n");
55 PrintError("Invalid CR0 Access type?? (type=%d)\n", cr_qual->access_type);
59 int v3_vmx_handle_cr3_access(struct guest_info * info, struct vmx_exit_cr_qual * cr_qual) {
61 if (cr_qual->access_type < 2) {
62 v3_reg_t * reg = get_reg_ptr(info, cr_qual);
64 if (cr_qual->access_type == 0) {
65 return handle_mov_to_cr3(info, reg);
67 return handle_mov_from_cr3(info, reg);
71 PrintError("Invalid CR3 Access type?? (type=%d)\n", cr_qual->access_type);
75 static int handle_mov_to_cr3(struct guest_info * info, v3_reg_t * cr3_reg) {
77 if (info->shdw_pg_mode == SHADOW_PAGING) {
80 PrintDebug("Old Guest CR3=%p, Old Shadow CR3=%p\n",
81 (void *)info->ctrl_regs.cr3,
82 (void *)info->shdw_pg_state.guest_cr3);
85 if (info->cpu_mode == LONG) {
86 info->shdw_pg_state.guest_cr3 = (uint64_t)*cr3_reg;
88 info->shdw_pg_state.guest_cr3 = (uint32_t)*cr3_reg;
92 if (v3_get_vm_mem_mode(info) == VIRTUAL_MEM) {
93 if (v3_activate_shadow_pt(info) == -1) {
94 PrintError("Failed to activate 32 bit shadow page table\n");
99 PrintDebug("New guest CR3=%p, New shadow CR3=%p\n",
100 (void *)info->ctrl_regs.cr3,
101 (void *)info->shdw_pg_state.guest_cr3);
103 } else if (info->shdw_pg_mode == NESTED_PAGING) {
104 PrintError("Nested paging not available in VMX right now!\n");
113 static int handle_mov_from_cr3(struct guest_info * info, v3_reg_t * cr3_reg) {
116 if (info->shdw_pg_mode == SHADOW_PAGING) {
118 if ((v3_get_vm_cpu_mode(info) == LONG) ||
119 (v3_get_vm_cpu_mode(info) == LONG_32_COMPAT)) {
121 *cr3_reg = (uint64_t)info->shdw_pg_state.guest_cr3;
123 *cr3_reg = (uint32_t)info->shdw_pg_state.guest_cr3;
127 PrintError("Unhandled paging mode\n");
135 static int handle_mov_to_cr0(struct guest_info * info, v3_reg_t * new_cr0, struct vmx_exit_info * exit_info) {
136 struct cr0_32 * guest_cr0 = (struct cr0_32 *)&(info->ctrl_regs.cr0);
137 struct cr0_32 * shdw_cr0 = (struct cr0_32 *)&(info->shdw_pg_state.guest_cr0);
138 struct cr0_32 * new_shdw_cr0 = (struct cr0_32 *)new_cr0;
139 struct vmx_data * vmx_info = (struct vmx_data *)info->vmm_data;
140 uint_t paging_transition = 0;
143 PrintDebug("Old shadow CR0: 0x%x, New shadow CR0: 0x%x\n",
144 (uint32_t)info->shdw_pg_state.guest_cr0, (uint32_t)*new_cr0);
147 if (new_shdw_cr0->pe != shdw_cr0->pe) {
149 PrintDebug("Guest CR0: 0x%x\n", *(uint32_t *)guest_cr0);
150 PrintDebug("Old shadow CR0: 0x%x\n", *(uint32_t *)shdw_cr0);
151 PrintDebug("New shadow CR0: 0x%x\n", *(uint32_t *)new_shdw_cr0);
154 if (v3_vmxassist_ctx_switch(info) != 0) {
155 PrintError("Unable to execute VMXASSIST context switch!\n");
159 if (vmx_info->state == VMXASSIST_ENABLED) {
160 PrintDebug("Loading VMXASSIST at RIP: %p\n", (void *)(addr_t)info->rip);
162 PrintDebug("Leaving VMXASSIST and entering protected mode at RIP: %p\n",
163 (void *)(addr_t)info->rip);
166 // PE switches modify the RIP directly, so we clear the instr_len field to avoid catastrophe
167 exit_info->instr_len = 0;
169 // v3_vmx_restore_vmcs(info);
170 // v3_print_vmcs(info);
174 if (new_shdw_cr0->pg != shdw_cr0->pg) {
175 paging_transition = 1;
178 // The shadow always reflects the new value
179 *shdw_cr0 = *new_shdw_cr0;
181 // We don't care about most of the flags, so lets go for it
182 // and set them to the guest values
183 *guest_cr0 = *shdw_cr0;
185 // Except PG, PE, and NE, which are always set
190 if (paging_transition) {
193 if (v3_get_vm_mem_mode(info) == VIRTUAL_MEM) {
194 struct efer_64 * guest_efer = (struct efer_64 *)&(info->ctrl_regs.efer);
196 if (guest_efer->lme == 1) {
197 // PrintDebug("Enabling long mode\n");
202 vmx_info->entry_ctrls.guest_ia32e = 1;
205 // PrintDebug("Activating Shadow Page tables\n");
207 if (v3_activate_shadow_pt(info) == -1) {
208 PrintError("Failed to activate shadow page tables\n");
212 } else if (v3_activate_passthrough_pt(info) == -1) {
213 PrintError("Failed to activate passthrough page tables\n");
222 static v3_reg_t * get_reg_ptr(struct guest_info * info, struct vmx_exit_cr_qual * cr_qual) {
223 v3_reg_t * reg = NULL;
225 switch (cr_qual->gpr) {
227 reg = &(info->vm_regs.rax);
230 reg = &(info->vm_regs.rcx);
233 reg = &(info->vm_regs.rdx);
236 reg = &(info->vm_regs.rbx);
239 reg = &(info->vm_regs.rsp);
242 reg = &(info->vm_regs.rbp);
245 reg = &(info->vm_regs.rsi);
248 reg = &(info->vm_regs.rdi);
251 reg = &(info->vm_regs.r8);
254 reg = &(info->vm_regs.r9);
257 reg = &(info->vm_regs.r10);
260 reg = &(info->vm_regs.r11);
263 reg = &(info->vm_regs.r11);
266 reg = &(info->vm_regs.r13);
269 reg = &(info->vm_regs.r14);
272 reg = &(info->vm_regs.r15);