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  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20 #include <palacios/vmm_shadow_paging.h>
  21 #include <palacios/vmm_ctrl_regs.h>
  22
  23 #include <palacios/vm_guest.h>
  24 #include <palacios/vm_guest_mem.h>
  25
  26
  27 #ifndef CONFIG_DEBUG_SHDW_PG_VTLB
  28 #undef PrintDebug
  29 #define PrintDebug(fmt, ...)
  30 #endif
  31
  32
  33 struct shadow_page_data {
  34     v3_reg_t cr3;
  35     addr_t page_pa;
  36
  37     struct list_head page_list_node;
  38 };
  39
  40
  41 struct vtlb_local_state {
  42
  43     struct list_head page_list;
  44
  45 };
  46
  47
  48 static struct shadow_page_data * create_new_shadow_pt(struct guest_info * core);
  49
  50
  51 #include "vmm_shdw_pg_tlb_32.h"
  52 #include "vmm_shdw_pg_tlb_32pae.h"
  53 #include "vmm_shdw_pg_tlb_64.h"
  54
  55
  56 static struct shadow_page_data * create_new_shadow_pt(struct guest_info * core) {
  57     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
  58     struct vtlb_local_state * impl_state = (struct vtlb_local_state *)(state->local_impl_data);
  59     v3_reg_t cur_cr3 = core->ctrl_regs.cr3;
  60     struct shadow_page_data * page_tail = NULL;
  61     addr_t shdw_page = 0;
  62
  63     if (!list_empty(&(impl_state->page_list))) {
  64         page_tail = list_tail_entry(&(impl_state->page_list), struct shadow_page_data, page_list_node);
  65
  66
  67         if (page_tail->cr3 != cur_cr3) {
  68             PrintDebug("Reusing old shadow Page: %p (cur_CR3=%p)(page_cr3=%p) \n",
  69                        (void *)(addr_t)page_tail->page_pa,
  70                        (void *)(addr_t)cur_cr3,
  71                        (void *)(addr_t)(page_tail->cr3));
  72
  73             list_move(&(page_tail->page_list_node), &(impl_state->page_list));
  74
  75             memset(V3_VAddr((void *)(page_tail->page_pa)), 0, PAGE_SIZE_4KB);
  76
  77
  78             return page_tail;
  79         }
  80     }
  81
  82     // else
  83
  84     page_tail = (struct shadow_page_data *)V3_Malloc(sizeof(struct shadow_page_data));
  85     page_tail->page_pa = (addr_t)V3_AllocPages(1);
  86
  87     PrintDebug("Allocating new shadow Page: %p (cur_cr3=%p)\n",
  88                (void *)(addr_t)page_tail->page_pa,
  89                (void *)(addr_t)cur_cr3);
  90
  91     page_tail->cr3 = cur_cr3;
  92     list_add(&(page_tail->page_list_node), &(impl_state->page_list));
  93
  94     shdw_page = (addr_t)V3_VAddr((void *)(page_tail->page_pa));
  95     memset((void *)shdw_page, 0, PAGE_SIZE_4KB);
  96
  97     return page_tail;
  98 }
  99
 100
 101
 102 static int vtlb_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
 103
 104     V3_Print("VTLB initialization\n");
 105     return 0;
 106 }
 107
 108 static int vtlb_deinit(struct v3_vm_info * vm) {
 109     return -1;
 110 }
 111
 112 static int vtlb_local_init(struct guest_info * core) {
 113     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
 114     struct vtlb_local_state * vtlb_state = NULL;
 115
 116     V3_Print("VTLB local initialization\n");
 117
 118
 119     vtlb_state = (struct vtlb_local_state *)V3_Malloc(sizeof(struct vtlb_local_state));
 120
 121     INIT_LIST_HEAD(&(vtlb_state->page_list));
 122
 123     state->local_impl_data = vtlb_state;
 124
 125     return 0;
 126 }
 127
 128
 129 static int vtlb_activate_shdw_pt(struct guest_info * core) {
 130     switch (v3_get_vm_cpu_mode(core)) {
 131
 132         case PROTECTED:
 133             return activate_shadow_pt_32(core);
 134         case PROTECTED_PAE:
 135             return activate_shadow_pt_32pae(core);
 136         case LONG:
 137         case LONG_32_COMPAT:
 138         case LONG_16_COMPAT:
 139             return activate_shadow_pt_64(core);
 140         default:
 141             PrintError("Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 142             return -1;
 143     }
 144
 145     return 0;
 146 }
 147
 148 static int vtlb_invalidate_shdw_pt(struct guest_info * core) {
 149     return vtlb_activate_shdw_pt(core);
 150 }
 151
 152
 153 static int vtlb_handle_pf(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) {
 154
 155         switch (v3_get_vm_cpu_mode(core)) {
 156             case PROTECTED:
 157                 return handle_shadow_pagefault_32(core, fault_addr, error_code);
 158                 break;
 159             case PROTECTED_PAE:
 160                 return handle_shadow_pagefault_32pae(core, fault_addr, error_code);
 161             case LONG:
 162             case LONG_32_COMPAT:
 163             case LONG_16_COMPAT:
 164                 return handle_shadow_pagefault_64(core, fault_addr, error_code);
 165                 break;
 166             default:
 167                 PrintError("Unhandled CPU Mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 168                 return -1;
 169         }
 170 }
 171
 172
 173 static int vtlb_handle_invlpg(struct guest_info * core, addr_t vaddr) {
 174
 175     switch (v3_get_vm_cpu_mode(core)) {
 176         case PROTECTED:
 177             return handle_shadow_invlpg_32(core, vaddr);
 178         case PROTECTED_PAE:
 179             return handle_shadow_invlpg_32pae(core, vaddr);
 180         case LONG:
 181         case LONG_32_COMPAT:
 182         case LONG_16_COMPAT:
 183             return handle_shadow_invlpg_64(core, vaddr);
 184         default:
 185             PrintError("Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 186             return -1;
 187     }
 188 }
 189
 190 static struct v3_shdw_pg_impl vtlb_impl =  {
 191     .name = "VTLB",
 192     .init = vtlb_init,
 193     .deinit = vtlb_deinit,
 194     .local_init = vtlb_local_init,
 195     .handle_pagefault = vtlb_handle_pf,
 196     .handle_invlpg = vtlb_handle_invlpg,
 197     .activate_shdw_pt = vtlb_activate_shdw_pt,
 198     .invalidate_shdw_pt = vtlb_invalidate_shdw_pt
 199 };
 200
 201
 202
 203
 204
 205 register_shdw_pg_impl(&vtlb_impl);