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     } else if (v3_is_vmx_capable()) {
  66         PrintDebug("Machine is VMX Capable\n");
  67         v3_init_vmx(vmm_ops);
  68     } else {
  69         PrintDebug("CPU has no virtualization Extensions\n");
  70     }
  71 }
  72
  73
  74
  75 #ifdef __V3_32BIT__
  76
  77 v3_cpu_mode_t v3_get_host_cpu_mode() {
  78     uint32_t cr4_val;
  79     struct cr4_32 * cr4;
  80
  81     __asm__ (
  82              "movl %%cr4, %0; "
  83              : "=r"(cr4_val)
  84              );
  85
  86
  87     cr4 = (struct cr4_32 *)&(cr4_val);
  88
  89     if (cr4->pae == 1) {
  90         return PROTECTED_PAE;
  91     } else {
  92         return PROTECTED;
  93     }
  94 }
  95
  96 #elif __V3_64BIT__
  97
  98 v3_cpu_mode_t v3_get_host_cpu_mode() {
  99     return LONG;
 100 }
 101
 102 #endif
 103
 104
 105 #define V3_Yield(addr)                                  \
 106     do {                                                \
 107         extern struct v3_os_hooks * os_hooks;           \
 108         if ((os_hooks) && (os_hooks)->yield_cpu) {      \
 109             (os_hooks)->yield_cpu();                    \
 110         }                                               \
 111     } while (0)                                         \
 112
 113
 114 void v3_yield_cond(struct guest_info * info) {
 115     uint64_t cur_cycle;
 116     rdtscll(cur_cycle);
 117
 118     if (cur_cycle > (info->yield_start_cycle + info->yield_cycle_period)) {
 119
 120         PrintDebug("Conditional Yield (cur_cyle=%p, start_cycle=%p, period=%p)\n",
 121                    (void *)cur_cycle, (void *)info->yield_start_cycle, (void *)info->yield_cycle_period);
 122
 123         V3_Yield();
 124         rdtscll(info->yield_start_cycle);
 125     }
 126 }
 127
 128 void v3_yield(struct guest_info * info) {
 129     V3_Yield();
 130     rdtscll(info->yield_start_cycle);
 131 }