palacios/src/palacios/vmm_shdw_pg_swapbypass.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 struct shadow_page_data {
  27     v3_reg_t cr3;
  28     addr_t page_pa;
  29
  30     struct list_head page_list_node;
  31 };
  32
  33
  34 struct swapbypass_local_state {
  35
  36     struct list_head page_list;
  37
  38 };
  39
  40
  41 static struct shadow_page_data * create_new_shadow_pt(struct guest_info * core);
  42
  43
  44 #include "vmm_shdw_pg_swapbypass_32.h"
  45 #include "vmm_shdw_pg_swapbypass_32pae.h"
  46 #include "vmm_shdw_pg_swapbypass_64.h"
  47
  48
  49 static struct shadow_page_data * create_new_shadow_pt(struct guest_info * core) {
  50     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
  51     struct swapbypass_local_state * impl_state = (struct swapbypass_local_state *)(state->local_impl_data);
  52     v3_reg_t cur_cr3 = core->ctrl_regs.cr3;
  53     struct shadow_page_data * page_tail = NULL;
  54     addr_t shdw_page = 0;
  55
  56     if (!list_empty(&(impl_state->page_list))) {
  57         page_tail = list_tail_entry(&(impl_state->page_list), struct shadow_page_data, page_list_node);
  58
  59
  60         if (page_tail->cr3 != cur_cr3) {
  61             PrintDebug("Reusing old shadow Page: %p (cur_CR3=%p)(page_cr3=%p) \n",
  62                        (void *)(addr_t)page_tail->page_pa,
  63                        (void *)(addr_t)cur_cr3,
  64                        (void *)(addr_t)(page_tail->cr3));
  65
  66             list_move(&(page_tail->page_list_node), &(impl_state->page_list));
  67
  68             memset(V3_VAddr((void *)(page_tail->page_pa)), 0, PAGE_SIZE_4KB);
  69
  70
  71             return page_tail;
  72         }
  73     }
  74
  75     // else
  76
  77     page_tail = (struct shadow_page_data *)V3_Malloc(sizeof(struct shadow_page_data));
  78     page_tail->page_pa = (addr_t)V3_AllocPages(1);
  79
  80     PrintDebug("Allocating new shadow Page: %p (cur_cr3=%p)\n",
  81                (void *)(addr_t)page_tail->page_pa,
  82                (void *)(addr_t)cur_cr3);
  83
  84     page_tail->cr3 = cur_cr3;
  85     list_add(&(page_tail->page_list_node), &(impl_state->page_list));
  86
  87     shdw_page = (addr_t)V3_VAddr((void *)(page_tail->page_pa));
  88     memset((void *)shdw_page, 0, PAGE_SIZE_4KB);
  89
  90     return page_tail;
  91 }
  92
  93
  94
  95 static int sb_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
  96
  97     V3_Print("SWAPBYPASS initialization\n");
  98     return 0;
  99 }
 100
 101 static int sb_deinit(struct v3_vm_info * vm) {
 102     return -1;
 103 }
 104
 105 static int sb_local_init(struct guest_info * core) {
 106     struct v3_shdw_pg_state * state = &(core->shdw_pg_state);
 107     struct swapbypass_local_state * swapbypass_state = NULL;
 108
 109     V3_Print("SWAPBYPASS local initialization\n");
 110
 111
 112     swapbypass_state = (struct swapbypass_local_state *)V3_Malloc(sizeof(struct swapbypass_local_state));
 113
 114     INIT_LIST_HEAD(&(swapbypass_state->page_list));
 115
 116     state->local_impl_data = swapbypass_state;
 117
 118     return 0;
 119 }
 120
 121
 122 static int sb_activate_shdw_pt(struct guest_info * core) {
 123     switch (v3_get_vm_cpu_mode(core)) {
 124
 125         case PROTECTED:
 126             return activate_shadow_pt_32(core);
 127         case PROTECTED_PAE:
 128             return activate_shadow_pt_32pae(core);
 129         case LONG:
 130         case LONG_32_COMPAT:
 131         case LONG_16_COMPAT:
 132             return activate_shadow_pt_64(core);
 133         default:
 134             PrintError("Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 135             return -1;
 136     }
 137
 138     return 0;
 139 }
 140
 141 static int sb_invalidate_shdw_pt(struct guest_info * core) {
 142     return sb_activate_shdw_pt(core);
 143 }
 144
 145
 146 static int sb_handle_pf(struct guest_info * core, addr_t fault_addr, pf_error_t error_code) {
 147
 148         switch (v3_get_vm_cpu_mode(core)) {
 149             case PROTECTED:
 150                 return handle_shadow_pagefault_32(core, fault_addr, error_code);
 151                 break;
 152             case PROTECTED_PAE:
 153                 return handle_shadow_pagefault_32pae(core, fault_addr, error_code);
 154             case LONG:
 155             case LONG_32_COMPAT:
 156             case LONG_16_COMPAT:
 157                 return handle_shadow_pagefault_64(core, fault_addr, error_code);
 158                 break;
 159             default:
 160                 PrintError("Unhandled CPU Mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 161                 return -1;
 162         }
 163 }
 164
 165
 166 static int sb_handle_invlpg(struct guest_info * core, addr_t vaddr) {
 167
 168     switch (v3_get_vm_cpu_mode(core)) {
 169         case PROTECTED:
 170             return handle_shadow_invlpg_32(core, vaddr);
 171         case PROTECTED_PAE:
 172             return handle_shadow_invlpg_32pae(core, vaddr);
 173         case LONG:
 174         case LONG_32_COMPAT:
 175         case LONG_16_COMPAT:
 176             return handle_shadow_invlpg_64(core, vaddr);
 177         default:
 178             PrintError("Invalid CPU mode: %s\n", v3_cpu_mode_to_str(v3_get_vm_cpu_mode(core)));
 179             return -1;
 180     }
 181 }
 182
 183 static struct v3_shdw_pg_impl sb_impl =  {
 184     .name = "SWAPBYPASS",
 185     .init = sb_init,
 186     .deinit = sb_deinit,
 187     .local_init = sb_local_init,
 188     .handle_pagefault = sb_handle_pf,
 189     .handle_invlpg = sb_handle_invlpg,
 190     .activate_shdw_pt = sb_activate_shdw_pt,
 191     .invalidate_shdw_pt = sb_invalidate_shdw_pt
 192 };
 193
 194
 195
 196
 197
 198 register_shdw_pg_impl(&sb_impl);