linux_module/palacios-vnet.c

   1 /*
   2  * Palacios VNET Host Hooks Implementations
   3  * Lei Xia 2010
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/kthread.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/gfp.h>
  10 #include <linux/sched.h>
  11 #include <linux/uaccess.h>
  12 #include <linux/init.h>
  13 #include <asm/delay.h>
  14 #include <linux/timer.h>
  15
  16 #include <vnet/vnet.h>
  17 #include "palacios.h"
  18 #include "mm.h"
  19 #include "palacios-vnet.h"
  20 #include "linux-exts.h"
  21
  22
  23
  24
  25 static void host_kthread_sleep(long timeout){
  26     set_current_state(TASK_INTERRUPTIBLE);
  27
  28     if(timeout <= 0){
  29         schedule();
  30     }else {
  31        schedule_timeout(timeout);
  32     }
  33
  34     return;
  35 }
  36
  37 static void host_kthread_wakeup(void * thread){
  38     struct task_struct * kthread = (struct task_struct *)thread;
  39
  40     wake_up_process(kthread);
  41 }
  42
  43 static void host_kthread_stop(void * thread){
  44     struct task_struct * kthread = (struct task_struct *)thread;
  45
  46     while (kthread_stop(kthread)==-EINTR)
  47         ;
  48 }
  49
  50 static int host_kthread_should_stop(void){
  51     return kthread_should_stop();
  52 }
  53
  54
  55 static void host_udelay(unsigned long usecs){
  56     udelay(usecs);
  57 }
  58
  59
  60
  61
  62
  63
  64
  65 struct host_timer {
  66     struct timer_list timer;
  67     unsigned long interval;
  68
  69     int active;
  70     void (* timer_fun)(void * private_data);
  71     void * pri_data;
  72 };
  73
  74
  75 void timeout_fn(unsigned long arg){
  76     struct host_timer * timer = (struct host_timer *)arg;
  77
  78     if(timer->active){
  79         timer->timer_fun(timer->pri_data);
  80
  81         mod_timer(&(timer->timer), timer->interval);
  82     }
  83 }
  84
  85 static void *
  86 host_create_timer(unsigned long interval,
  87                   void (* timer_fun)(void * priv_data),
  88                   void * data){
  89     struct host_timer * timer = (struct host_timer *)palacios_alloc(sizeof(struct host_timer));
  90
  91     if (!timer) {
  92         ERROR("Unable to allocate timer in VNET\n");
  93         return NULL;
  94     }
  95
  96     timer->interval = interval;
  97     timer->timer_fun = timer_fun;
  98     timer->pri_data = data;
  99
 100     init_timer(&(timer->timer));
 101
 102     timer->timer.data = (unsigned long)timer;
 103     timer->timer.function = timeout_fn;
 104     timer->timer.expires = interval;
 105
 106     return timer;
 107 }
 108
 109 static void
 110 host_start_timer(void * vnet_timer){
 111     struct host_timer * timer = (struct host_timer *)vnet_timer;
 112
 113     timer->active = 1;
 114     add_timer(&(timer->timer));
 115 }
 116
 117 static void
 118 host_reset_timer(void * vnet_timer, unsigned long interval){
 119     struct host_timer * timer = (struct host_timer *)vnet_timer;
 120
 121     timer->interval = interval;
 122 }
 123
 124 static void
 125 host_stop_timer(void * vnet_timer){
 126     struct host_timer * timer = (struct host_timer *)vnet_timer;
 127
 128     timer->active = 0;
 129     del_timer(&(timer->timer));
 130 }
 131
 132 static void
 133 host_del_timer(void * vnet_timer){
 134     struct host_timer * timer = (struct host_timer *)vnet_timer;
 135
 136     del_timer(&(timer->timer));
 137
 138     palacios_free(timer);
 139 }
 140
 141
 142 static void *
 143 host_allocate_pages(int num_pages, unsigned int alignment, int node_id)
 144 {
 145     // allocates pages preferentially on the caller's node
 146     return palacios_allocate_pages(num_pages, alignment, node_id, 0, 0);
 147 }
 148
 149
 150
 151 static struct vnet_host_hooks vnet_host_hooks = {
 152     .timer_create               = host_create_timer,
 153     .timer_del                  = host_del_timer,
 154     .timer_start                = host_start_timer,
 155     .timer_stop                 = host_stop_timer,
 156     .timer_reset                = host_reset_timer,
 157
 158     .thread_start               = palacios_create_and_start_kernel_thread,
 159     .thread_sleep               = host_kthread_sleep,
 160     .thread_wakeup              = host_kthread_wakeup,
 161     .thread_stop                = host_kthread_stop,
 162     .thread_should_stop         = host_kthread_should_stop,
 163     .udelay                     = host_udelay,
 164
 165     .yield_cpu                  = palacios_yield_cpu,
 166     .mutex_alloc                = palacios_mutex_alloc,
 167     .mutex_free                 = palacios_mutex_free,
 168     .mutex_lock                 = palacios_mutex_lock,
 169     .mutex_unlock               = palacios_mutex_unlock,
 170     .mutex_lock_irqsave         = palacios_mutex_lock_irqsave,
 171     .mutex_unlock_irqrestore    = palacios_mutex_unlock_irqrestore,
 172
 173     .print                      = palacios_print_scoped,
 174     .allocate_pages             = host_allocate_pages,
 175     .free_pages                 = palacios_free_pages,
 176     .malloc                     = palacios_alloc,
 177     .free                       = palacios_free,
 178     .vaddr_to_paddr             = palacios_vaddr_to_paddr,
 179     .paddr_to_vaddr             = palacios_paddr_to_vaddr,
 180 };
 181
 182
 183
 184 static int vnet_init( void ) {
 185     init_vnet(&vnet_host_hooks);
 186
 187     vnet_bridge_init();
 188     vnet_ctrl_init();
 189
 190     INFO("V3 VNET Inited\n");
 191
 192     return 0;
 193 }
 194
 195
 196 static int vnet_deinit( void ) {
 197
 198     INFO("V3 Control Deinit Start\n");
 199
 200     vnet_ctrl_deinit();
 201
 202     INFO("V3 Bridge Deinit Start\n");
 203
 204     vnet_bridge_deinit();
 205
 206     INFO("V3 VNET Deinit Start\n");
 207
 208     deinit_vnet();
 209
 210     INFO("V3 VNET Deinited\n");
 211
 212     return 0;
 213 }
 214
 215 static struct linux_ext vnet_ext = {
 216     .name = "VNET",
 217     .init = vnet_init,
 218     .deinit = vnet_deinit,
 219     .guest_init = NULL,
 220     .guest_deinit = NULL
 221 };
 222
 223 register_extension(&vnet_ext);