palacios/src/palacios/vmm_symspy.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_symspy.h>
  21 #include <palacios/vmm.h>
  22 #include <palacios/vmm_msr.h>
  23 #include <palacios/vm_guest.h>
  24 #include <palacios/vmm_sprintf.h>
  25
  26 #define SYMSPY_GLOBAL_MSR 0x534
  27 #define SYMSPY_LOCAL_MSR 0x535
  28
  29
  30 static int symspy_msr_read(struct guest_info * core, uint_t msr,
  31                     struct v3_msr * dst, void * priv_data) {
  32     struct v3_symspy_global_state * global_state = &(core->vm_info->sym_vm_state.symspy_state);
  33     struct v3_symspy_local_state * local_state = &(core->sym_core_state.symspy_state);
  34
  35     switch (msr) {
  36         case SYMSPY_GLOBAL_MSR:
  37             dst->value = global_state->global_guest_pa;
  38             break;
  39         case SYMSPY_LOCAL_MSR:
  40             dst->value = local_state->local_guest_pa;
  41             break;
  42         default:
  43             return -1;
  44     }
  45
  46     return 0;
  47 }
  48
  49
  50 static int symspy_msr_write(struct guest_info * core, uint_t msr, struct v3_msr src, void * priv_data) {
  51
  52     if (msr == SYMSPY_GLOBAL_MSR) {
  53         struct v3_symspy_global_state * global_state = &(core->vm_info->sym_vm_state.symspy_state);
  54
  55         PrintDebug("Symbiotic Glbal MSR write for page %p\n", (void *)(addr_t)src.value);
  56
  57         if (global_state->active == 1) {
  58             // unmap page
  59             struct v3_mem_region * old_reg = v3_get_mem_region(core->vm_info, core->vcpu_id,
  60                                                                      (addr_t)global_state->global_guest_pa);
  61
  62             if (old_reg == NULL) {
  63                 PrintError("Could not find previously active symbiotic page (%p)\n",
  64                            (void *)(addr_t)global_state->global_guest_pa);
  65                 return -1;
  66             }
  67
  68             v3_delete_mem_region(core->vm_info, old_reg);
  69         }
  70
  71         global_state->global_guest_pa = src.value;
  72         global_state->global_guest_pa &= ~0xfffLL;
  73
  74         global_state->active = 1;
  75
  76         // map page
  77         v3_add_shadow_mem(core->vm_info, V3_MEM_CORE_ANY, (addr_t)global_state->global_guest_pa,
  78                           (addr_t)(global_state->global_guest_pa + PAGE_SIZE_4KB - 1),
  79                           global_state->global_page_pa);
  80     } else if (msr == SYMSPY_LOCAL_MSR) {
  81         struct v3_symspy_local_state * local_state = &(core->sym_core_state.symspy_state);
  82
  83         PrintDebug("Symbiotic Local MSR write for page %p\n", (void *)(addr_t)src.value);
  84
  85         if (local_state->active == 1) {
  86             // unmap page
  87             struct v3_mem_region * old_reg = v3_get_mem_region(core->vm_info, core->vcpu_id,
  88                                                                      (addr_t)local_state->local_guest_pa);
  89
  90             if (old_reg == NULL) {
  91                 PrintError("Could not find previously active symbiotic page (%p)\n",
  92                            (void *)(addr_t)local_state->local_guest_pa);
  93                 return -1;
  94             }
  95
  96             v3_delete_mem_region(core->vm_info, old_reg);
  97         }
  98
  99         local_state->local_guest_pa = src.value;
 100         local_state->local_guest_pa &= ~0xfffLL;
 101
 102         local_state->active = 1;
 103
 104         // map page
 105         v3_add_shadow_mem(core->vm_info, core->vcpu_id, (addr_t)local_state->local_guest_pa,
 106                           (addr_t)(local_state->local_guest_pa + PAGE_SIZE_4KB - 1),
 107                           local_state->local_page_pa);
 108     } else {
 109         PrintError("Invalid Symbiotic MSR write (0x%x)\n", msr);
 110         return -1;
 111     }
 112
 113     return 0;
 114 }
 115
 116
 117
 118 int v3_init_symspy_vm(struct v3_vm_info * vm, struct v3_symspy_global_state * state) {
 119
 120     state->global_page_pa = (addr_t)V3_AllocPages(1);
 121     state->sym_page = (struct v3_symspy_global_page *)V3_VAddr((void *)state->global_page_pa);
 122     memset(state->sym_page, 0, PAGE_SIZE_4KB);
 123
 124     memcpy(&(state->sym_page->magic), "V3V", 3);
 125
 126     v3_hook_msr(vm, SYMSPY_LOCAL_MSR, symspy_msr_read, symspy_msr_write, NULL);
 127     v3_hook_msr(vm, SYMSPY_GLOBAL_MSR, symspy_msr_read, symspy_msr_write, NULL);
 128
 129     return 0;
 130 }
 131
 132
 133
 134 int v3_init_symspy_core(struct guest_info * core, struct v3_symspy_local_state * state) {
 135     state->local_page_pa = (addr_t)V3_AllocPages(1);
 136     state->local_page = (struct v3_symspy_local_page *)V3_VAddr((void *)state->local_page_pa);
 137     memset(state->local_page, 0, PAGE_SIZE_4KB);
 138
 139     snprintf((uint8_t *)&(state->local_page->magic), 8, "V3V.%d", core->vcpu_id);
 140
 141     return 0;
 142 }
 143
 144
 145
 146 int v3_sym_map_pci_passthrough(struct v3_vm_info * vm, uint_t bus, uint_t dev, uint_t fn) {
 147     struct v3_symspy_global_state * global_state = &(vm->sym_vm_state.symspy_state);
 148     uint_t dev_index = (bus << 8) + (dev << 3) + fn;
 149     uint_t major = dev_index / 8;
 150     uint_t minor = dev_index % 8;
 151
 152     if (bus > 3) {
 153         PrintError("Invalid PCI bus %d\n", bus);
 154         return -1;
 155     }
 156
 157     PrintDebug("Setting passthrough pci map for index=%d\n", dev_index);
 158
 159     global_state->sym_page->pci_pt_map[major] |= 0x1 << minor;
 160
 161     PrintDebug("pt_map entry=%x\n",   global_state->sym_page->pci_pt_map[major]);
 162
 163     PrintDebug("pt map vmm addr=%p\n", global_state->sym_page->pci_pt_map);
 164
 165     return 0;
 166 }
 167
 168 int v3_sym_unmap_pci_passthrough(struct v3_vm_info * vm, uint_t bus, uint_t dev, uint_t fn) {
 169     struct v3_symspy_global_state * global_state = &(vm->sym_vm_state.symspy_state);
 170     uint_t dev_index = (bus << 8) + (dev << 3) + fn;
 171     uint_t major = dev_index / 8;
 172     uint_t minor = dev_index % 8;
 173
 174     if (bus > 3) {
 175         PrintError("Invalid PCI bus %d\n", bus);
 176         return -1;
 177     }
 178
 179     global_state->sym_page->pci_pt_map[major] &= ~(0x1 << minor);
 180
 181     return 0;
 182 }
 183
 184
 185 struct v3_symspy_global_page * v3_sym_get_symspy_vm(struct v3_vm_info * vm) {
 186     return vm->sym_vm_state.symspy_state.sym_page;
 187 }
 188
 189 struct v3_symspy_local_page * v3_sym_get_symspy_core(struct guest_info * core) {
 190     return core->sym_core_state.symspy_state.local_page;
 191 }