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 static inline int get_constraints(struct guest_info *core)
  58 {
  59   // the current version of VTLB does not require any constraints
  60   // on where page tables are allocated since it will use
  61   // 32PAE page tables on a 64 bit machine even in 32 bit mode and below
  62   return 0;
  63 }
  64
  65
  66 static struct shadow_page_data * create_new_shadow_pt(struct guest_info * core) {
  67     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
  68     struct vtlb_local_state * impl_state = (struct vtlb_local_state *)(state->local_impl_data);
  69     v3_reg_t cur_cr3 = core->ctrl_regs.cr3;
  70     struct shadow_page_data * page_tail = NULL;
  71     addr_t shdw_page = 0;
  72
  73     if (!list_empty(&(impl_state->page_list))) {
  74         page_tail = list_tail_entry(&(impl_state->page_list), struct shadow_page_data, page_list_node);
  75
  76
  77         if (page_tail->cr3 != cur_cr3) {
  78             PrintDebug(core->vm_info, core, "Reusing old shadow Page: %p (cur_CR3=%p)(page_cr3=%p) \n",
  79                        (void *)(addr_t)page_tail->page_pa,
  80                        (void *)(addr_t)cur_cr3,
  81                        (void *)(addr_t)(page_tail->cr3));
  82
  83             list_move(&(page_tail->page_list_node), &(impl_state->page_list));
  84
  85             memset(V3_VAddr((void *)(page_tail->page_pa)), 0, PAGE_SIZE_4KB);
  86
  87
  88             return page_tail;
  89         }
  90     }
  91
  92     // else
  93
  94     page_tail = (struct shadow_page_data *)V3_Malloc(sizeof(struct shadow_page_data));
  95
  96     if (!page_tail) {
  97         PrintError(core->vm_info, core, "Cannot allocate\n");
  98         return NULL;
  99     }
 100
 101     page_tail->page_pa = (addr_t)V3_AllocPagesExtended(1,PAGE_SIZE_4KB,-1,get_constraints(core));
 102
 103     if (!page_tail->page_pa) {
 104         PrintError(core->vm_info, core, "Cannot allocate page\n");
 105         return NULL;
 106     }
 107
 108     PrintDebug(core->vm_info, core, "Allocating new shadow Page: %p (cur_cr3=%p)\n",
 109                (void *)(addr_t)page_tail->page_pa,
 110                (void *)(addr_t)cur_cr3);
 111
 112     page_tail->cr3 = cur_cr3;
 113     list_add(&(page_tail->page_list_node), &(impl_state->page_list));
 114
 115     shdw_page = (addr_t)V3_VAddr((void *)(page_tail->page_pa));
 116     memset((void *)shdw_page, 0, PAGE_SIZE_4KB);
 117
 118     return page_tail;
 119 }
 120
 121
 122
 123 static int vtlb_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 124
 125     V3_Print(vm, VCORE_NONE, "VTLB initialization\n");
 126     return 0;
 127 }
 128
 129 static int vtlb_deinit(struct v3_vm_info * vm) {
 130     return 0;
 131 }
 132
 133 static int vtlb_local_init(struct guest_info * core) {
 134     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
 135     struct vtlb_local_state * vtlb_state = NULL;
 136
 137     V3_Print(core->vm_info, core, "VTLB local initialization\n");
 138
 139     vtlb_state = (struct vtlb_local_state *)V3_Malloc(sizeof(struct vtlb_local_state));
 140
 141     if (!vtlb_state) {
 142         PrintError(core->vm_info, core, "Cannot allocate\n");
 143         return -1;
 144     }
 145
 146     INIT_LIST_HEAD(&(vtlb_state->page_list));
 147
 148     state->local_impl_data = vtlb_state;
 149
 150     return 0;
 151 }
 152
 153
 154 static int vtlb_local_deinit(struct guest_info * core) {
 155     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
 156     struct vtlb_local_state * vtlb_state = state->local_impl_data;
 157
 158     struct shadow_page_data * shdw_pg = NULL;
 159     struct shadow_page_data * tmp = NULL;
 160
 161     // free page list...
 162     list_for_each_entry_safe(shdw_pg, tmp, &(vtlb_state->page_list), page_list_node) {
 163         list_del(&(shdw_pg->page_list_node));
 164         V3_FreePages((void *)shdw_pg->page_pa, 1);
 165         V3_Free(shdw_pg);
 166     }
 167
 168
 169     V3_Free(vtlb_state);
 170
 171     return 0;
 172 }
 173
 174
 175 static int vtlb_activate_shdw_pt(struct guest_info * core) {
 176     switch (v3_get_vm_cpu_mode(core)) {
 177
 178         case PROTECTED:
 179             return activate_shadow_pt_32(core);
 180             break;
 181         case PROTECTED_PAE:
 182             return activate_shadow_pt_32pae(core);
 183             break;
 184         case LONG:
 185         case LONG_32_COMPAT:
 186         case LONG_16_COMPAT:
 187             return activate_shadow_pt_64(core);
 188             break;
 189         default:
 190             PrintError(core->vm_info, core, "Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 191             return -1;
 192             break;
 193     }
 194
 195     return 0;
 196 }
 197
 198 static int vtlb_invalidate_shdw_pt(struct guest_info * core) {
 199     return vtlb_activate_shdw_pt(core);
 200 }
 201
 202
 203 static int vtlb_handle_pf(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) {
 204
 205         switch (v3_get_vm_cpu_mode(core)) {
 206             case PROTECTED:
 207                 return handle_shadow_pagefault_32(core, fault_addr, error_code);
 208                 break;
 209             case PROTECTED_PAE:
 210                 return handle_shadow_pagefault_32pae(core, fault_addr, error_code);
 211             case LONG:
 212             case LONG_32_COMPAT:
 213             case LONG_16_COMPAT:
 214                 return handle_shadow_pagefault_64(core, fault_addr, error_code);
 215                 break;
 216             default:
 217                 PrintError(core->vm_info, core, "Unhandled CPU Mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 218                 return -1;
 219         }
 220 }
 221
 222
 223 static int vtlb_handle_invlpg(struct guest_info * core, addr_t vaddr) {
 224
 225     switch (v3_get_vm_cpu_mode(core)) {
 226         case PROTECTED:
 227             return handle_shadow_invlpg_32(core, vaddr);
 228             break;
 229         case PROTECTED_PAE:
 230             return handle_shadow_invlpg_32pae(core, vaddr);
 231             break;
 232         case LONG:
 233         case LONG_32_COMPAT:
 234         case LONG_16_COMPAT:
 235             return handle_shadow_invlpg_64(core, vaddr);
 236             break;
 237         default:
 238             PrintError(core->vm_info, core, "Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 239             return -1;
 240             break;
 241     }
 242 }
 243
 244 static struct v3_shdw_pg_impl vtlb_impl =  {
 245     .name = "VTLB",
 246     .init = vtlb_init,
 247     .deinit = vtlb_deinit,
 248     .local_init = vtlb_local_init,
 249     .local_deinit = vtlb_local_deinit,
 250     .handle_pagefault = vtlb_handle_pf,
 251     .handle_invlpg = vtlb_handle_invlpg,
 252     .activate_shdw_pt = vtlb_activate_shdw_pt,
 253     .invalidate_shdw_pt = vtlb_invalidate_shdw_pt
 254 };
 255
 256
 257
 258
 259
 260 register_shdw_pg_impl(&vtlb_impl);