Palacios Public Git Repository

To checkout Palacios execute

  git clone http://v3vee.org/palacios/palacios.web/palacios.git
This will give you the master branch. You probably want the devel branch or one of the release branches. To switch to the devel branch, simply execute
  cd palacios
  git checkout --track -b devel origin/devel
The other branches are similar.


added extension framework
[palacios.git] / palacios / src / palacios / vmm_extensions.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
22 #include <palacios/vmm_extensions.h>
23 #include <palacios/vm_guest.h>
24 #include <palacios/vmm_hashtable.h>
25
26
27 static struct hashtable * ext_table = NULL;
28
29
30 static uint_t ext_hash_fn(addr_t key) {
31     char * name = (char *)key;
32     return v3_hash_buffer((uint8_t *)name, strlen(name));
33 }
34
35 static int ext_eq_fn(addr_t key1, addr_t key2) {
36     char * name1 = (char *)key1;
37     char * name2 = (char *)key2;
38
39     return (strcmp(name1, name2) == 0);
40 }
41
42
43
44 int V3_init_extensions() {
45     extern struct v3_extension_impl * __start__v3_extensions[];
46     extern struct v3_extension_impl * __stop__v3_extensions[];
47     struct v3_extension_impl ** tmp_ext = __start__v3_extensions;
48     int i = 0;
49
50     ext_table = v3_create_htable(0, ext_hash_fn, ext_eq_fn);
51
52     while (tmp_ext != __stop__v3_extensions) {
53         V3_Print("Registering Extension (%s)\n", (*tmp_ext)->name);
54
55         if (v3_htable_search(ext_table, (addr_t)((*tmp_ext)->name))) {
56             PrintError("Multiple instances of Extension (%s)\n", (*tmp_ext)->name);
57             return -1;
58         }
59
60         if (v3_htable_insert(ext_table, (addr_t)((*tmp_ext)->name), (addr_t)(*tmp_ext)) == 0) {
61             PrintError("Could not register Extension (%s)\n", (*tmp_ext)->name);
62             return -1;
63         }
64
65         tmp_ext = &(__start__v3_extensions[++i]);
66     }
67
68     return 0;
69 }
70
71
72 int V3_deinit_extensions() {
73     v3_free_htable(ext_table, 0, 0);
74     return 0;
75 }
76
77
78 int v3_init_ext_manager(struct v3_vm_info * vm) {
79     struct v3_extensions * ext_state = &(vm->extensions);
80
81     INIT_LIST_HEAD(&(ext_state->extensions));
82     INIT_LIST_HEAD(&(ext_state->on_exits));
83     INIT_LIST_HEAD(&(ext_state->on_entries));
84     
85     return 0;
86 }
87
88 int v3_add_extension(struct v3_vm_info * vm, const char * name, v3_cfg_tree_t * cfg) {
89     struct v3_extension_impl * impl = NULL;
90     struct v3_extension * ext = NULL;
91
92     impl = (void *)v3_htable_search(ext_table, (addr_t)name);
93
94     if (impl == NULL) {
95         PrintError("Could not find requested extension (%s)\n", name);
96         return -1;
97     }
98     
99     V3_ASSERT(impl->init);
100
101     ext = V3_Malloc(sizeof(struct v3_extension));
102     
103     if (!ext) {
104         PrintError("Could not allocate extension\n");
105         return -1;
106     }
107
108     ext->impl = impl;
109
110     if (impl->init(vm, cfg, &(ext->priv_data)) == -1) {
111         PrintError("Error initializing Extension (%s)\n", name);
112         V3_Free(ext);
113         return -1;
114     }
115
116     list_add(&(ext->node), &(vm->extensions.extensions));
117
118     if (impl->on_exit) {
119         list_add(&(ext->exit_node), &(vm->extensions.on_exits));
120     }
121
122     if (impl->on_entry) {
123         list_add(&(ext->entry_node), &(vm->extensions.on_entries));
124     }
125     
126     return 0;
127 }