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
 119 #ifdef V3_CONFIG_EXT_INSPECTOR
 120 #include "palacios-inspector.h"
 121 #endif
 122
 123 #ifdef V3_CONFIG_GRAPHICS_CONSOLE
 124 #include "palacios-graphics-console.h"
 125 #endif
 126
 127 #ifdef V3_CONFIG_HOST_DEVICE
 128 #include "palacios-host-dev.h"
 129 #define HOST_DEV_URL_LEN 256
 130 #endif
 131
 132 extern struct class * v3_class;
 133 #define STREAM_NAME_LEN 128
 134
 135 static long v3_vm_ioctl(struct file * filp,
 136                         unsigned int ioctl, unsigned long arg) {
 137
 138     struct v3_guest * guest = filp->private_data;
 139
 140     printk("V3 IOCTL %d\n", ioctl);
 141
 142     switch (ioctl) {
 143
 144         case V3_VM_STOP: {
 145             printk("Stopping VM\n");
 146             stop_palacios_vm(guest);
 147             break;
 148         }
 149
 150
 151         case V3_VM_STREAM_CONNECT: {
 152 #ifdef V3_CONFIG_STREAM
 153             void __user * argp = (void __user *)arg;
 154             char path_name[STREAM_NAME_LEN];
 155
 156             if (copy_from_user(path_name, argp, STREAM_NAME_LEN)) {
 157                 printk("%s(%d): copy from user error...\n", __FILE__, __LINE__);
 158                 return -EFAULT;
 159             }
 160
 161             return open_stream(path_name);
 162 #else
 163             printk("Stream support Not available\n");
 164             return -EFAULT;
 165 #endif
 166             break;
 167         }
 168
 169         case V3_VM_HOST_DEV_CONNECT: {
 170 #ifdef V3_CONFIG_HOST_DEVICE
 171             void __user * argp = (void __user *)arg;
 172             char host_dev_url[HOST_DEV_URL_LEN];
 173
 174             if (copy_from_user(host_dev_url, argp, HOST_DEV_URL_LEN)) {
 175                 printk("copy from user error getting url for host device connect...\n");
 176                 return -EFAULT;
 177             }
 178
 179             return connect_host_dev(guest,host_dev_url);
 180 #else
 181             printk("palacios: Host device support not available\n");
 182             return -EFAULT;
 183 #endif
 184             break;
 185         }
 186
 187         case V3_VM_FB_INPUT:
 188 #ifdef V3_CONFIG_GRAPHICS_CONSOLE
 189             return palacios_graphics_console_user_input(&(guest->graphics_console),
 190                                                         (struct v3_fb_input __user *) arg) ;
 191 #else
 192             return -EFAULT;
 193 #endif
 194             break;
 195
 196         case V3_VM_FB_QUERY:
 197 #ifdef V3_CONFIG_GRAPHICS_CONSOLE
 198             return palacios_graphics_console_user_query(&(guest->graphics_console),
 199                                                         (struct v3_fb_query_response __user *) arg);
 200 #else
 201             return -EFAULT;
 202 #endif
 203             break;
 204
 205
 206         default: {
 207             struct vm_ctrl * ctrl = get_ctrl(guest, ioctl);
 208
 209             if (ctrl) {
 210                 return ctrl->handler(guest, ioctl, arg, ctrl->priv_data);
 211             }
 212
 213
 214             printk("\tUnhandled ctrl cmd: %d\n", ioctl);
 215             return -EINVAL;
 216         }
 217     }
 218
 219     return 0;
 220 }
 221
 222 static int v3_vm_open(struct inode * inode, struct file * filp) {
 223     struct v3_guest * guest = container_of(inode->i_cdev, struct v3_guest, cdev);
 224     filp->private_data = guest;
 225     return 0;
 226 }
 227
 228
 229 static ssize_t v3_vm_read(struct file * filp, char __user * buf, size_t size, loff_t * offset) {
 230
 231     return 0;
 232 }
 233
 234
 235 static ssize_t v3_vm_write(struct file * filp, const char __user * buf, size_t size, loff_t * offset) {
 236
 237     return 0;
 238 }
 239
 240
 241 static struct file_operations v3_vm_fops = {
 242     .owner = THIS_MODULE,
 243     .unlocked_ioctl = v3_vm_ioctl,
 244     .compat_ioctl = v3_vm_ioctl,
 245     .open = v3_vm_open,
 246     .read = v3_vm_read,
 247     .write = v3_vm_write,
 248 };
 249
 250
 251 extern u32 pg_allocs;
 252 extern u32 pg_frees;
 253 extern u32 mallocs;
 254 extern u32 frees;
 255
 256 int start_palacios_vm(void * arg)  {
 257     struct v3_guest * guest = (struct v3_guest *)arg;
 258     int err;
 259
 260     lock_kernel();
 261     daemonize(guest->name);
 262     // allow_signal(SIGKILL);
 263     unlock_kernel();
 264
 265
 266     guest->v3_ctx = v3_create_vm(guest->img, (void *)guest, guest->name);
 267
 268     if (guest->v3_ctx == NULL) {
 269         printk("palacios: failed to create vm\n");
 270         complete(&(guest->start_done));
 271         return -1;
 272     }
 273
 274     // init linux extensions
 275
 276
 277 #ifdef V3_CONFIG_EXT_INSPECTOR
 278     inspect_vm(guest);
 279 #endif
 280
 281     printk("Creating VM device: Major %d, Minor %d\n", MAJOR(guest->vm_dev), MINOR(guest->vm_dev));
 282
 283     cdev_init(&(guest->cdev), &v3_vm_fops);
 284
 285     guest->cdev.owner = THIS_MODULE;
 286     guest->cdev.ops = &v3_vm_fops;
 287
 288
 289     printk("Adding VM device\n");
 290     err = cdev_add(&(guest->cdev), guest->vm_dev, 1);
 291
 292     if (err) {
 293         printk("Fails to add cdev\n");
 294         v3_free_vm(guest->v3_ctx);
 295         complete(&(guest->start_done));
 296         return -1;
 297     }
 298
 299     if (device_create(v3_class, NULL, guest->vm_dev, guest, "v3-vm%d", MINOR(guest->vm_dev)) == NULL){
 300         printk("Fails to create device\n");
 301         cdev_del(&(guest->cdev));
 302         v3_free_vm(guest->v3_ctx);
 303         complete(&(guest->start_done));
 304         return -1;
 305     }
 306
 307     complete(&(guest->start_done));
 308
 309     printk("palacios: launching vm\n");
 310
 311     if (v3_start_vm(guest->v3_ctx, 0xffffffff) < 0) {
 312         printk("palacios: launch of vm failed\n");
 313         device_destroy(v3_class, guest->vm_dev);
 314         cdev_del(&(guest->cdev));
 315         v3_free_vm(guest->v3_ctx);
 316         return -1;
 317     }
 318
 319     complete(&(guest->thread_done));
 320
 321     printk("palacios: vm completed.  returning.\n");
 322
 323     return 0;
 324 }
 325
 326
 327
 328
 329 int stop_palacios_vm(struct v3_guest * guest) {
 330
 331     v3_stop_vm(guest->v3_ctx);
 332
 333     wait_for_completion(&(guest->thread_done));
 334
 335     v3_free_vm(guest->v3_ctx);
 336
 337     device_destroy(v3_class, guest->vm_dev);
 338
 339     cdev_del(&(guest->cdev));
 340
 341     kfree(guest->img);
 342     kfree(guest);
 343
 344     return 0;
 345 }