linux_module/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/file.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/rbtree.h>
  19
  20 #include <palacios/vmm.h>
  21
  22 #include "palacios.h"
  23 #include "vm.h"
  24 #include "linux-exts.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
 115
 116
 117
 118
 119 extern struct class * v3_class;
 120
 121
 122 static long v3_vm_ioctl(struct file * filp,
 123                         unsigned int ioctl, unsigned long arg) {
 124
 125     struct v3_guest * guest = filp->private_data;
 126
 127     printk("V3 IOCTL %d\n", ioctl);
 128
 129     switch (ioctl) {
 130
 131         case V3_VM_STOP: {
 132             printk("Stopping VM (%s)\n", guest->name);
 133             stop_palacios_vm(guest);
 134             break;
 135         }
 136         case V3_VM_PAUSE: {
 137             printk("Pausing VM (%s)\n", guest->name);
 138             v3_pause_vm(guest->v3_ctx);
 139             break;
 140         }
 141         case V3_VM_CONTINUE: {
 142             printk("Continuing VM (%s)\n", guest->name);
 143             v3_continue_vm(guest->v3_ctx);
 144             break;
 145         }
 146
 147         default: {
 148             struct vm_ctrl * ctrl = get_ctrl(guest, ioctl);
 149
 150             if (ctrl) {
 151                 return ctrl->handler(guest, ioctl, arg, ctrl->priv_data);
 152             }
 153
 154
 155             printk("\tUnhandled ctrl cmd: %d\n", ioctl);
 156             return -EINVAL;
 157         }
 158     }
 159
 160     return 0;
 161 }
 162
 163 static int v3_vm_open(struct inode * inode, struct file * filp) {
 164     struct v3_guest * guest = container_of(inode->i_cdev, struct v3_guest, cdev);
 165     filp->private_data = guest;
 166     return 0;
 167 }
 168
 169
 170 static ssize_t v3_vm_read(struct file * filp, char __user * buf, size_t size, loff_t * offset) {
 171
 172     return 0;
 173 }
 174
 175
 176 static ssize_t v3_vm_write(struct file * filp, const char __user * buf, size_t size, loff_t * offset) {
 177
 178     return 0;
 179 }
 180
 181
 182 static struct file_operations v3_vm_fops = {
 183     .owner = THIS_MODULE,
 184     .unlocked_ioctl = v3_vm_ioctl,
 185     .compat_ioctl = v3_vm_ioctl,
 186     .open = v3_vm_open,
 187     .read = v3_vm_read,
 188     .write = v3_vm_write,
 189 };
 190
 191
 192 extern u32 pg_allocs;
 193 extern u32 pg_frees;
 194 extern u32 mallocs;
 195 extern u32 frees;
 196
 197 int start_palacios_vm(void * arg)  {
 198     struct v3_guest * guest = (struct v3_guest *)arg;
 199     int err;
 200
 201
 202     daemonize(guest->name);
 203     // allow_signal(SIGKILL);
 204
 205
 206     init_vm_extensions(guest);
 207
 208     guest->v3_ctx = v3_create_vm(guest->img, (void *)guest, guest->name);
 209
 210     if (guest->v3_ctx == NULL) {
 211         printk("palacios: failed to create vm\n");
 212         complete(&(guest->start_done));
 213         return -1;
 214     }
 215
 216
 217     printk("Creating VM device: Major %d, Minor %d\n", MAJOR(guest->vm_dev), MINOR(guest->vm_dev));
 218
 219     cdev_init(&(guest->cdev), &v3_vm_fops);
 220
 221     guest->cdev.owner = THIS_MODULE;
 222     guest->cdev.ops = &v3_vm_fops;
 223
 224
 225     printk("Adding VM device\n");
 226     err = cdev_add(&(guest->cdev), guest->vm_dev, 1);
 227
 228     if (err) {
 229         printk("Fails to add cdev\n");
 230         v3_free_vm(guest->v3_ctx);
 231         complete(&(guest->start_done));
 232         return -1;
 233     }
 234
 235     if (device_create(v3_class, NULL, guest->vm_dev, guest, "v3-vm%d", MINOR(guest->vm_dev)) == NULL){
 236         printk("Fails to create device\n");
 237         cdev_del(&(guest->cdev));
 238         v3_free_vm(guest->v3_ctx);
 239         complete(&(guest->start_done));
 240         return -1;
 241     }
 242
 243     complete(&(guest->start_done));
 244
 245     printk("palacios: launching vm\n");
 246
 247     if (v3_start_vm(guest->v3_ctx, 0xffffffff) < 0) {
 248         printk("palacios: launch of vm failed\n");
 249         device_destroy(v3_class, guest->vm_dev);
 250         cdev_del(&(guest->cdev));
 251         v3_free_vm(guest->v3_ctx);
 252         return -1;
 253     }
 254
 255     complete(&(guest->thread_done));
 256
 257     printk("palacios: vm completed.  returning.\n");
 258
 259     return 0;
 260 }
 261
 262
 263
 264
 265 int stop_palacios_vm(struct v3_guest * guest) {
 266
 267     v3_stop_vm(guest->v3_ctx);
 268
 269     wait_for_completion(&(guest->thread_done));
 270
 271     v3_free_vm(guest->v3_ctx);
 272
 273     device_destroy(v3_class, guest->vm_dev);
 274
 275     cdev_del(&(guest->cdev));
 276
 277     vfree(guest->img);
 278     kfree(guest);
 279
 280     return 0;
 281 }