palacios/src/palacios/vmm.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.h>
  21 #include <palacios/svm.h>
  22 #include <palacios/vmx.h>
  23 #include <palacios/vmm_intr.h>
  24 #include <palacios/vmm_config.h>
  25 #include <palacios/vm_guest.h>
  26 #include <palacios/vmm_instrument.h>
  27 #include <palacios/vmm_ctrl_regs.h>
  28 #include <palacios/vmm_lowlevel.h>
  29
  30
  31
  32
  33 v3_cpu_arch_t v3_cpu_type;
  34 struct v3_os_hooks * os_hooks = NULL;
  35
  36
  37
  38 static struct guest_info * allocate_guest() {
  39     void * info = V3_Malloc(sizeof(struct guest_info));
  40     memset(info, 0, sizeof(struct guest_info));
  41     return info;
  42 }
  43
  44
  45
  46 void Init_V3(struct v3_os_hooks * hooks, struct v3_ctrl_ops * vmm_ops) {
  47
  48     // Set global variables.
  49     os_hooks = hooks;
  50     v3_cpu_type = V3_INVALID_CPU;
  51
  52     // Register all the possible device types
  53     v3_init_devices();
  54
  55
  56 #ifdef INSTRUMENT_VMM
  57     v3_init_instrumentation();
  58 #endif
  59
  60     vmm_ops->allocate_guest = &allocate_guest;
  61
  62     if (v3_is_svm_capable()) {
  63         PrintDebug("Machine is SVM Capable\n");
  64         v3_init_SVM(vmm_ops);
  65 #ifdef CONFIG_VMX
  66     } else if (v3_is_vmx_capable()) {
  67         PrintDebug("Machine is VMX Capable\n");
  68         v3_init_vmx(vmm_ops);
  69 #endif
  70     } else {
  71         PrintDebug("CPU has no virtualization Extensions\n");
  72     }
  73 }
  74
  75
  76
  77 #ifdef __V3_32BIT__
  78
  79 v3_cpu_mode_t v3_get_host_cpu_mode() {
  80     uint32_t cr4_val;
  81     struct cr4_32 * cr4;
  82
  83     __asm__ (
  84              "movl %%cr4, %0; "
  85              : "=r"(cr4_val)
  86              );
  87
  88
  89     cr4 = (struct cr4_32 *)&(cr4_val);
  90
  91     if (cr4->pae == 1) {
  92         return PROTECTED_PAE;
  93     } else {
  94         return PROTECTED;
  95     }
  96 }
  97
  98 #elif __V3_64BIT__
  99
 100 v3_cpu_mode_t v3_get_host_cpu_mode() {
 101     return LONG;
 102 }
 103
 104 #endif
 105
 106
 107 #define V3_Yield(addr)                                  \
 108     do {                                                \
 109         extern struct v3_os_hooks * os_hooks;           \
 110         if ((os_hooks) && (os_hooks)->yield_cpu) {      \
 111             (os_hooks)->yield_cpu();                    \
 112         }                                               \
 113     } while (0)                                         \
 114
 115
 116 void v3_yield_cond(struct guest_info * info) {
 117     uint64_t cur_cycle;
 118     rdtscll(cur_cycle);
 119
 120     if (cur_cycle > (info->yield_start_cycle + info->yield_cycle_period)) {
 121
 122         /*
 123           PrintDebug("Conditional Yield (cur_cyle=%p, start_cycle=%p, period=%p)\n",
 124           (void *)cur_cycle, (void *)info->yield_start_cycle, (void *)info->yield_cycle_period);
 125         */
 126         V3_Yield();
 127         rdtscll(info->yield_start_cycle);
 128     }
 129 }
 130
 131 void v3_yield(struct guest_info * info) {
 132     V3_Yield();
 133     rdtscll(info->yield_start_cycle);
 134 }