linux_module/palacios-vm.c

   1 /*
   2  * VM specific Controls
   3  * (c) Jack Lange, 2010
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/cdev.h>
   8 #include <linux/errno.h>
   9 #include <linux/percpu.h>
  10 #include <linux/fs.h>
  11 #include <linux/uaccess.h>
  12 #include <linux/poll.h>
  13 #include <linux/anon_inodes.h>
  14 #include <linux/sched.h>
  15
  16 #include <linux/smp_lock.h>
  17 #include <linux/file.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/rbtree.h>
  20
  21 #include <palacios/vmm.h>
  22
  23 #include "palacios.h"
  24 #include "palacios-vm.h"
  25
  26
  27 struct vm_ctrl {
  28     unsigned int cmd;
  29
  30     int (*handler)(struct v3_guest * guest,
  31                    unsigned int cmd, unsigned long arg,
  32                    void * priv_data);
  33
  34     void * priv_data;
  35
  36     struct rb_node tree_node;
  37 };
  38
  39
  40 static inline struct vm_ctrl * __insert_ctrl(struct v3_guest * vm,
  41                                              struct vm_ctrl * ctrl) {
  42     struct rb_node ** p = &(vm->vm_ctrls.rb_node);
  43     struct rb_node * parent = NULL;
  44     struct vm_ctrl * tmp_ctrl = NULL;
  45
  46     while (*p) {
  47         parent = *p;
  48         tmp_ctrl = rb_entry(parent, struct vm_ctrl, tree_node);
  49
  50         if (ctrl->cmd < tmp_ctrl->cmd) {
  51             p = &(*p)->rb_left;
  52         } else if (ctrl->cmd > tmp_ctrl->cmd) {
  53             p = &(*p)->rb_right;
  54         } else {
  55             return tmp_ctrl;
  56         }
  57     }
  58
  59     rb_link_node(&(ctrl->tree_node), parent, p);
  60
  61     return NULL;
  62 }
  63
  64
  65
  66 int add_guest_ctrl(struct v3_guest * guest, unsigned int cmd,
  67                    int (*handler)(struct v3_guest * guest,
  68                                   unsigned int cmd, unsigned long arg,
  69                                   void * priv_data),
  70                    void * priv_data) {
  71     struct vm_ctrl * ctrl = kmalloc(sizeof(struct vm_ctrl), GFP_KERNEL);
  72
  73     if (ctrl == NULL) {
  74         printk("Error: Could not allocate vm ctrl %d\n", cmd);
  75         return -1;
  76     }
  77
  78     ctrl->cmd = cmd;
  79     ctrl->handler = handler;
  80     ctrl->priv_data = priv_data;
  81
  82     if (__insert_ctrl(guest, ctrl) != NULL) {
  83         printk("Could not insert guest ctrl %d\n", cmd);
  84         kfree(ctrl);
  85         return -1;
  86     }
  87
  88     rb_insert_color(&(ctrl->tree_node), &(guest->vm_ctrls));
  89
  90     return 0;
  91 }
  92
  93
  94 static struct vm_ctrl * get_ctrl(struct v3_guest * guest, unsigned int cmd) {
  95     struct rb_node * n = guest->vm_ctrls.rb_node;
  96     struct vm_ctrl * ctrl = NULL;
  97
  98     while (n) {
  99         ctrl = rb_entry(n, struct vm_ctrl, tree_node);
 100
 101         if (cmd < ctrl->cmd) {
 102             n = n->rb_left;
 103         } else if (cmd > ctrl->cmd) {
 104             n = n->rb_right;
 105         } else {
 106             return ctrl;
 107         }
 108     }
 109
 110     return NULL;
 111 }
 112
 113
 114 #ifdef V3_CONFIG_STREAM
 115 #include "palacios-stream.h"
 116 #endif
 117
 118 #ifdef V3_CONFIG_CONSOLE
 119 #include "palacios-console.h"
 120 #endif
 121
 122 #ifdef V3_CONFIG_EXT_INSPECTOR
 123 #include "palacios-inspector.h"
 124 #endif
 125
 126 #ifdef V3_CONFIG_GRAPHICS_CONSOLE
 127 #include "palacios-graphics-console.h"
 128 #endif
 129
 130 #ifdef V3_CONFIG_HOST_DEVICE
 131 #include "palacios-host-dev.h"
 132 #endif
 133
 134 extern struct class * v3_class;
 135 #define STREAM_NAME_LEN 128
 136
 137 static long v3_vm_ioctl(struct file * filp,
 138                         unsigned int ioctl, unsigned long arg) {
 139
 140     struct v3_guest * guest = filp->private_data;
 141
 142     printk("V3 IOCTL %d\n", ioctl);
 143
 144     switch (ioctl) {
 145
 146         case V3_VM_STOP: {
 147             printk("Stopping VM\n");
 148             stop_palacios_vm(guest);
 149             break;
 150         }
 151
 152         case V3_VM_CONSOLE_CONNECT: {
 153 #ifdef V3_CONFIG_CONSOLE
 154             return connect_console(guest);
 155 #else
 156             printk("Console support not available\n");
 157             return -EFAULT;
 158 #endif
 159             break;
 160         }
 161
 162         case V3_VM_STREAM_CONNECT: {
 163 #ifdef V3_CONFIG_STREAM
 164             void __user * argp = (void __user *)arg;
 165             char path_name[STREAM_NAME_LEN];
 166
 167             if (copy_from_user(path_name, argp, STREAM_NAME_LEN)) {
 168                 printk("%s(%d): copy from user error...\n", __FILE__, __LINE__);
 169                 return -EFAULT;
 170             }
 171
 172             return open_stream(path_name);
 173 #else
 174             printk("Stream support Not available\n");
 175             return -EFAULT;
 176 #endif
 177             break;
 178         }
 179
 180         case V3_VM_HOST_DEV_CONNECT: {
 181 #ifdef V3_CONFIG_HOST_DEV
 182             if (copy_from_user(host_dev_url, argp, HOST_DEV_URL_LEN)) {
 183                 printk("copy from user error getting url for host device connect...\n");
 184                 return -EFAULT;
 185             }
 186
 187             return connect_host_dev(guest,host_dev_url);
 188 #else
 189             printk("palacios: Host device support not available\n");
 190             return -EFAULT;
 191 #endif
 192             break;
 193         }
 194
 195         case V3_VM_FB_INPUT:
 196 #ifdef V3_CONFIG_GRAPHICS_CONSOLE
 197             return palacios_graphics_console_user_input(&(guest->graphics_console),
 198                                                         (struct v3_fb_input __user *) arg) ;
 199 #else
 200             return -EFAULT;
 201 #endif
 202             break;
 203
 204         case V3_VM_FB_QUERY:
 205 #ifdef V3_CONFIG_GRAPHICS_CONSOLE
 206             return palacios_graphics_console_user_query(&(guest->graphics_console),
 207                                                         (struct v3_fb_query_response __user *) arg);
 208 #else
 209             return -EFAULT;
 210 #endif
 211             break;
 212
 213
 214         default: {
 215             struct vm_ctrl * ctrl = get_ctrl(guest, ioctl);
 216
 217             if (ctrl) {
 218                 return ctrl->handler(guest, ioctl, arg, ctrl->priv_data);
 219             }
 220
 221
 222             printk("\tUnhandled ctrl cmd: %d\n", ioctl);
 223             return -EINVAL;
 224         }
 225     }
 226
 227     return 0;
 228 }
 229
 230 static int v3_vm_open(struct inode * inode, struct file * filp) {
 231     struct v3_guest * guest = container_of(inode->i_cdev, struct v3_guest, cdev);
 232     filp->private_data = guest;
 233     return 0;
 234 }
 235
 236
 237 static ssize_t v3_vm_read(struct file * filp, char __user * buf, size_t size, loff_t * offset) {
 238
 239     return 0;
 240 }
 241
 242
 243 static ssize_t v3_vm_write(struct file * filp, const char __user * buf, size_t size, loff_t * offset) {
 244
 245     return 0;
 246 }
 247
 248
 249 static struct file_operations v3_vm_fops = {
 250     .owner = THIS_MODULE,
 251     .unlocked_ioctl = v3_vm_ioctl,
 252     .compat_ioctl = v3_vm_ioctl,
 253     .open = v3_vm_open,
 254     .read = v3_vm_read,
 255     .write = v3_vm_write,
 256 };
 257
 258
 259 extern int vm_running;
 260 extern u32 pg_allocs;
 261 extern u32 pg_frees;
 262 extern u32 mallocs;
 263 extern u32 frees;
 264
 265 int start_palacios_vm(void * arg)  {
 266     struct v3_guest * guest = (struct v3_guest *)arg;
 267     int err;
 268
 269     lock_kernel();
 270     daemonize(guest->name);
 271     // allow_signal(SIGKILL);
 272     unlock_kernel();
 273
 274
 275     guest->v3_ctx = v3_create_vm(guest->img, (void *)guest, guest->name);
 276
 277     if (guest->v3_ctx == NULL) {
 278         printk("palacios: failed to create vm\n");
 279         complete(&(guest->start_done));
 280         return -1;
 281     }
 282
 283     // init linux extensions
 284 #ifdef V3_CONFIG_EXT_INSPECTOR
 285     inspect_vm(guest);
 286 #endif
 287
 288     printk("Creating VM device: Major %d, Minor %d\n", MAJOR(guest->vm_dev), MINOR(guest->vm_dev));
 289
 290     cdev_init(&(guest->cdev), &v3_vm_fops);
 291
 292     guest->cdev.owner = THIS_MODULE;
 293     guest->cdev.ops = &v3_vm_fops;
 294
 295
 296     printk("Adding VM device\n");
 297     err = cdev_add(&(guest->cdev), guest->vm_dev, 1);
 298
 299     if (err) {
 300         printk("Fails to add cdev\n");
 301         v3_free_vm(guest->v3_ctx);
 302         complete(&(guest->start_done));
 303         return -1;
 304     }
 305
 306     if (device_create(v3_class, NULL, guest->vm_dev, guest, "v3-vm%d", MINOR(guest->vm_dev)) == NULL){
 307         printk("Fails to create device\n");
 308         cdev_del(&(guest->cdev));
 309         v3_free_vm(guest->v3_ctx);
 310         complete(&(guest->start_done));
 311         return -1;
 312     }
 313
 314     complete(&(guest->start_done));
 315
 316     printk("palacios: launching vm\n");
 317
 318
 319
 320
 321
 322     if (v3_start_vm(guest->v3_ctx, 0xffffffff) < 0) {
 323         printk("palacios: launch of vm failed\n");
 324         device_destroy(v3_class, guest->vm_dev);
 325         cdev_del(&(guest->cdev));
 326         v3_free_vm(guest->v3_ctx);
 327         return -1;
 328     }
 329
 330     complete(&(guest->thread_done));
 331
 332     printk("palacios: vm completed.  returning.\n");
 333
 334     return 0;
 335 }
 336
 337
 338
 339
 340 int stop_palacios_vm(struct v3_guest * guest) {
 341
 342     v3_stop_vm(guest->v3_ctx);
 343
 344     wait_for_completion(&(guest->thread_done));
 345
 346     v3_free_vm(guest->v3_ctx);
 347
 348     device_destroy(v3_class, guest->vm_dev);
 349
 350     cdev_del(&(guest->cdev));
 351
 352     kfree(guest->img);
 353     kfree(guest);
 354
 355     return 0;
 356 }