The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/reboot.c

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    1 /*
    2  *
    3  * Copyright (c) 2004 Christian Limpach.
    4  * Copyright (c) 2004-2006,2008 Kip Macy
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Christian Limpach.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/8.1/sys/xen/reboot.c 199583 2009-11-20 15:27:52Z jhb $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/bus.h>
   38 #include <sys/malloc.h>
   39 #include <sys/kernel.h>
   40 #include <sys/proc.h>
   41 #include <sys/reboot.h>
   42 #include <sys/sched.h>
   43 #include <sys/smp.h>
   44 #include <sys/systm.h>
   45 
   46 #include <machine/xen/xen-os.h>
   47 #include <xen/hypervisor.h>
   48 #include <xen/gnttab.h>
   49 #include <xen/xen_intr.h>
   50 #include <xen/xenbus/xenbusvar.h>
   51 
   52 #include <vm/vm.h>
   53 #include <vm/pmap.h>
   54 
   55 #ifdef XENHVM
   56 
   57 #include <dev/xen/xenpci/xenpcivar.h>
   58 
   59 #else
   60 
   61 static void xen_suspend(void);
   62 
   63 #endif
   64 
   65 static void 
   66 shutdown_handler(struct xenbus_watch *watch,
   67                  const char **vec, unsigned int len)
   68 {
   69         char *str;
   70         struct xenbus_transaction xbt;
   71         int error, howto;
   72         
   73         howto = 0;
   74 
   75  again:
   76         error = xenbus_transaction_start(&xbt);
   77         if (error)
   78                 return;
   79 
   80         error = xenbus_read(xbt, "control", "shutdown", NULL, (void **) &str);
   81 
   82         /* Ignore read errors and empty reads. */
   83         if (error || strlen(str) == 0) {
   84                 xenbus_transaction_end(xbt, 1);
   85                 return;
   86         }
   87 
   88         xenbus_write(xbt, "control", "shutdown", "");
   89 
   90         error = xenbus_transaction_end(xbt, 0);
   91         if (error == EAGAIN) {
   92                 free(str, M_DEVBUF);
   93                 goto again;
   94         }
   95 
   96         if (strcmp(str, "reboot") == 0)
   97                 howto = 0;
   98         else if (strcmp(str, "poweroff") == 0)
   99                 howto |= (RB_POWEROFF | RB_HALT);
  100         else if (strcmp(str, "halt") == 0)
  101 #ifdef XENHVM
  102                 /*
  103                  * We rely on acpi powerdown to halt the VM.
  104                  */
  105                 howto |= (RB_POWEROFF | RB_HALT);
  106 #else
  107                 howto |= RB_HALT;
  108 #endif
  109         else if (strcmp(str, "suspend") == 0)
  110                 howto = -1;
  111         else {
  112                 printf("Ignoring shutdown request: %s\n", str);
  113                 goto done;
  114         }
  115 
  116         if (howto == -1) {
  117                 xen_suspend();
  118                 goto done;
  119         }
  120 
  121         shutdown_nice(howto);
  122  done:
  123         free(str, M_DEVBUF);
  124 }
  125 
  126 #ifndef XENHVM
  127 
  128 /*
  129  * In HV mode, we let acpi take care of halts and reboots.
  130  */
  131 
  132 static void
  133 xen_shutdown_final(void *arg, int howto)
  134 {
  135 
  136         if (howto & (RB_HALT | RB_POWEROFF))
  137                 HYPERVISOR_shutdown(SHUTDOWN_poweroff);
  138         else
  139                 HYPERVISOR_shutdown(SHUTDOWN_reboot);
  140 }
  141 
  142 #endif
  143 
  144 static struct xenbus_watch shutdown_watch = {
  145         .node = "control/shutdown",
  146         .callback = shutdown_handler
  147 };
  148 
  149 static void
  150 setup_shutdown_watcher(void *unused)
  151 {
  152 
  153         if (register_xenbus_watch(&shutdown_watch))
  154                 printf("Failed to set shutdown watcher\n");
  155 #ifndef XENHVM
  156         EVENTHANDLER_REGISTER(shutdown_final, xen_shutdown_final, NULL,
  157             SHUTDOWN_PRI_LAST);
  158 #endif
  159 }
  160 
  161 SYSINIT(shutdown, SI_SUB_PSEUDO, SI_ORDER_ANY, setup_shutdown_watcher, NULL);
  162 
  163 #ifndef XENHVM
  164 
  165 extern void xencons_suspend(void);
  166 extern void xencons_resume(void);
  167 
  168 static void 
  169 xen_suspend()
  170 {
  171         int i, j, k, fpp;
  172         unsigned long max_pfn, start_info_mfn;
  173 
  174 #ifdef SMP
  175         cpumask_t map;
  176         /*
  177          * Bind us to CPU 0 and stop any other VCPUs.
  178          */
  179         thread_lock(curthread);
  180         sched_bind(curthread, 0);
  181         thread_unlock(curthread);
  182         KASSERT(PCPU_GET(cpuid) == 0, ("xen_suspend: not running on cpu 0"));
  183 
  184         map = PCPU_GET(other_cpus) & ~stopped_cpus;
  185         if (map)
  186                 stop_cpus(map);
  187 #endif
  188 
  189         if (DEVICE_SUSPEND(root_bus) != 0) {
  190                 printf("xen_suspend: device_suspend failed\n");
  191 #ifdef SMP
  192                 if (map)
  193                         restart_cpus(map);
  194 #endif
  195                 return;
  196         }
  197 
  198         local_irq_disable();
  199 
  200         xencons_suspend();
  201         gnttab_suspend();
  202 
  203         max_pfn = HYPERVISOR_shared_info->arch.max_pfn;
  204 
  205         void *shared_info = HYPERVISOR_shared_info;
  206         HYPERVISOR_shared_info = NULL;
  207         pmap_kremove((vm_offset_t) shared_info);
  208         PT_UPDATES_FLUSH();
  209 
  210         xen_start_info->store_mfn = MFNTOPFN(xen_start_info->store_mfn);
  211         xen_start_info->console.domU.mfn = MFNTOPFN(xen_start_info->console.domU.mfn);
  212 
  213         /*
  214          * We'll stop somewhere inside this hypercall. When it returns,
  215          * we'll start resuming after the restore.
  216          */
  217         start_info_mfn = VTOMFN(xen_start_info);
  218         pmap_suspend();
  219         HYPERVISOR_suspend(start_info_mfn);
  220         pmap_resume();
  221 
  222         pmap_kenter_ma((vm_offset_t) shared_info, xen_start_info->shared_info);
  223         HYPERVISOR_shared_info = shared_info;
  224 
  225         HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
  226                 VTOMFN(xen_pfn_to_mfn_frame_list_list);
  227   
  228         fpp = PAGE_SIZE/sizeof(unsigned long);
  229         for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) {
  230                 if ((j % fpp) == 0) {
  231                         k++;
  232                         xen_pfn_to_mfn_frame_list_list[k] = 
  233                                 VTOMFN(xen_pfn_to_mfn_frame_list[k]);
  234                         j = 0;
  235                 }
  236                 xen_pfn_to_mfn_frame_list[k][j] = 
  237                         VTOMFN(&xen_phys_machine[i]);
  238         }
  239         HYPERVISOR_shared_info->arch.max_pfn = max_pfn;
  240 
  241         gnttab_resume();
  242         irq_resume();
  243         local_irq_enable();
  244         xencons_resume();
  245 
  246 #ifdef CONFIG_SMP
  247         for_each_cpu(i)
  248                 vcpu_prepare(i);
  249 
  250 #endif
  251         /* 
  252          * Only resume xenbus /after/ we've prepared our VCPUs; otherwise
  253          * the VCPU hotplug callback can race with our vcpu_prepare
  254          */
  255         DEVICE_RESUME(root_bus);
  256 
  257 #ifdef SMP
  258         thread_lock(curthread);
  259         sched_unbind(curthread);
  260         thread_unlock(curthread);
  261         if (map)
  262                 restart_cpus(map);
  263 #endif
  264 }
  265 
  266 #endif

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