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