palacios/src/palacios/mmu/vmm_shdw_pg_tlb.c

   1 /*
   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.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  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.
  13  *
  14  * Author: Jack Lange <jarusl@cs.northwestern.edu>
  15  * Author: Chunxiao Diao <chunxiaodiao2012@u.northwestern.edu>
  16  *
  17  *
  18  * This is free software.  You are permitted to use,
  19  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  20  */
  21
  22 #include <palacios/vmm_shadow_paging.h>
  23 #include <palacios/vmm_ctrl_regs.h>
  24
  25 #include <palacios/vm_guest.h>
  26 #include <palacios/vm_guest_mem.h>
  27
  28
  29 #ifndef V3_CONFIG_DEBUG_SHDW_PG_VTLB
  30 #undef PrintDebug
  31 #define PrintDebug(fmt, ...)
  32 #endif
  33
  34
  35 struct shadow_page_data {
  36     v3_reg_t cr3;
  37     addr_t page_pa;
  38
  39     struct list_head page_list_node;
  40 };
  41
  42
  43 struct vtlb_local_state {
  44
  45     struct list_head page_list;
  46
  47 };
  48
  49
  50 static struct shadow_page_data * create_new_shadow_pt(struct guest_info * core);
  51
  52
  53 #include "vmm_shdw_pg_tlb_32.h"
  54 #include "vmm_shdw_pg_tlb_32pae.h"
  55 #include "vmm_shdw_pg_tlb_64.h"
  56
  57
  58
  59 static struct shadow_page_data * create_new_shadow_pt(struct guest_info * core) {
  60     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
  61     struct vtlb_local_state * impl_state = (struct vtlb_local_state *)(state->local_impl_data);
  62     v3_reg_t cur_cr3 = core->ctrl_regs.cr3;
  63     struct shadow_page_data * page_tail = NULL;
  64     addr_t shdw_page = 0;
  65
  66     if (!list_empty(&(impl_state->page_list))) {
  67         page_tail = list_tail_entry(&(impl_state->page_list), struct shadow_page_data, page_list_node);
  68
  69
  70         if (page_tail->cr3 != cur_cr3) {
  71             PrintDebug(core->vm_info, core, "Reusing old shadow Page: %p (cur_CR3=%p)(page_cr3=%p) \n",
  72                        (void *)(addr_t)page_tail->page_pa,
  73                        (void *)(addr_t)cur_cr3,
  74                        (void *)(addr_t)(page_tail->cr3));
  75
  76             list_move(&(page_tail->page_list_node), &(impl_state->page_list));
  77
  78             memset(V3_VAddr((void *)(page_tail->page_pa)), 0, PAGE_SIZE_4KB);
  79
  80
  81             return page_tail;
  82         }
  83     }
  84
  85     // else
  86
  87     page_tail = (struct shadow_page_data *)V3_Malloc(sizeof(struct shadow_page_data));
  88
  89     if (!page_tail) {
  90         PrintError(core->vm_info, core, "Cannot allocate\n");
  91         return NULL;
  92     }
  93
  94     page_tail->page_pa = (addr_t)V3_AllocPagesExtended(1,PAGE_SIZE_4KB,-1,0,0);
  95
  96     if (!page_tail->page_pa) {
  97         PrintError(core->vm_info, core, "Cannot allocate page\n");
  98         return NULL;
  99     }
 100
 101     PrintDebug(core->vm_info, core, "Allocating new shadow Page: %p (cur_cr3=%p)\n",
 102                (void *)(addr_t)page_tail->page_pa,
 103                (void *)(addr_t)cur_cr3);
 104
 105     page_tail->cr3 = cur_cr3;
 106     list_add(&(page_tail->page_list_node), &(impl_state->page_list));
 107
 108     shdw_page = (addr_t)V3_VAddr((void *)(page_tail->page_pa));
 109     memset((void *)shdw_page, 0, PAGE_SIZE_4KB);
 110
 111     return page_tail;
 112 }
 113
 114
 115
 116 static int vtlb_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 117
 118     V3_Print(vm, VCORE_NONE, "VTLB initialization\n");
 119     return 0;
 120 }
 121
 122 static int vtlb_deinit(struct v3_vm_info * vm) {
 123     return 0;
 124 }
 125
 126 static int vtlb_local_init(struct guest_info * core) {
 127     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
 128     struct vtlb_local_state * vtlb_state = NULL;
 129
 130     V3_Print(core->vm_info, core, "VTLB local initialization\n");
 131
 132     vtlb_state = (struct vtlb_local_state *)V3_Malloc(sizeof(struct vtlb_local_state));
 133
 134     if (!vtlb_state) {
 135         PrintError(core->vm_info, core, "Cannot allocate\n");
 136         return -1;
 137     }
 138
 139     INIT_LIST_HEAD(&(vtlb_state->page_list));
 140
 141     state->local_impl_data = vtlb_state;
 142
 143     return 0;
 144 }
 145
 146
 147 static int vtlb_local_deinit(struct guest_info * core) {
 148     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
 149     struct vtlb_local_state * vtlb_state = state->local_impl_data;
 150
 151     struct shadow_page_data * shdw_pg = NULL;
 152     struct shadow_page_data * tmp = NULL;
 153
 154     // free page list...
 155     list_for_each_entry_safe(shdw_pg, tmp, &(vtlb_state->page_list), page_list_node) {
 156         list_del(&(shdw_pg->page_list_node));
 157         V3_FreePages((void *)shdw_pg->page_pa, 1);
 158         V3_Free(shdw_pg);
 159     }
 160
 161
 162     V3_Free(vtlb_state);
 163
 164     return 0;
 165 }
 166
 167
 168 static int vtlb_activate_shdw_pt(struct guest_info * core) {
 169     switch (v3_get_vm_cpu_mode(core)) {
 170
 171         case PROTECTED:
 172             return activate_shadow_pt_32(core);
 173             break;
 174         case PROTECTED_PAE:
 175             return activate_shadow_pt_32pae(core);
 176             break;
 177         case LONG:
 178         case LONG_32_COMPAT:
 179         case LONG_16_COMPAT:
 180             return activate_shadow_pt_64(core);
 181             break;
 182         default:
 183             PrintError(core->vm_info, core, "Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 184             return -1;
 185             break;
 186     }
 187
 188     return 0;
 189 }
 190
 191 static int vtlb_invalidate_shdw_pt(struct guest_info * core) {
 192     return vtlb_activate_shdw_pt(core);
 193 }
 194
 195
 196 static int vtlb_handle_pf(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) {
 197
 198         switch (v3_get_vm_cpu_mode(core)) {
 199             case PROTECTED:
 200                 return handle_shadow_pagefault_32(core, fault_addr, error_code);
 201                 break;
 202             case PROTECTED_PAE:
 203                 return handle_shadow_pagefault_32pae(core, fault_addr, error_code);
 204             case LONG:
 205             case LONG_32_COMPAT:
 206             case LONG_16_COMPAT:
 207                 return handle_shadow_pagefault_64(core, fault_addr, error_code);
 208                 break;
 209             default:
 210                 PrintError(core->vm_info, core, "Unhandled CPU Mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 211                 return -1;
 212         }
 213 }
 214
 215
 216 static int vtlb_handle_invlpg(struct guest_info * core, addr_t vaddr) {
 217
 218     switch (v3_get_vm_cpu_mode(core)) {
 219         case PROTECTED:
 220             return handle_shadow_invlpg_32(core, vaddr);
 221             break;
 222         case PROTECTED_PAE:
 223             return handle_shadow_invlpg_32pae(core, vaddr);
 224             break;
 225         case LONG:
 226         case LONG_32_COMPAT:
 227         case LONG_16_COMPAT:
 228             return handle_shadow_invlpg_64(core, vaddr);
 229             break;
 230         default:
 231             PrintError(core->vm_info, core, "Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 232             return -1;
 233             break;
 234     }
 235 }
 236
 237 static struct v3_shdw_pg_impl vtlb_impl =  {
 238     .name = "VTLB",
 239     .init = vtlb_init,
 240     .deinit = vtlb_deinit,
 241     .local_init = vtlb_local_init,
 242     .local_deinit = vtlb_local_deinit,
 243     .handle_pagefault = vtlb_handle_pf,
 244     .handle_invlpg = vtlb_handle_invlpg,
 245     .activate_shdw_pt = vtlb_activate_shdw_pt,
 246     .invalidate_shdw_pt = vtlb_invalidate_shdw_pt
 247 };
 248
 249
 250
 251
 252
 253 register_shdw_pg_impl(&vtlb_impl);