arch/x86/xen/suspend.c

   1 #include <linux/types.h>
   2 #include <linux/tick.h>
   3
   4 #include <xen/interface/xen.h>
   5 #include <xen/grant_table.h>
   6 #include <xen/events.h>
   7
   8 #include <asm/xen/hypercall.h>
   9 #include <asm/xen/page.h>
  10 #include <asm/fixmap.h>
  11
  12 #include "xen-ops.h"
  13 #include "mmu.h"
  14
  15 static void xen_pv_pre_suspend(void)
  16 {
  17         xen_mm_pin_all();
  18
  19         xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
  20         xen_start_info->console.domU.mfn =
  21                 mfn_to_pfn(xen_start_info->console.domU.mfn);
  22
  23         BUG_ON(!irqs_disabled());
  24
  25         HYPERVISOR_shared_info = &xen_dummy_shared_info;
  26         if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
  27                                          __pte_ma(0), 0))
  28                 BUG();
  29 }
  30
  31 static void xen_hvm_post_suspend(int suspend_cancelled)
  32 {
  33 #ifdef CONFIG_XEN_PVHVM
  34         int cpu;
  35         if (!suspend_cancelled)
  36             xen_hvm_init_shared_info();
  37         xen_callback_vector();
  38         xen_unplug_emulated_devices();
  39         if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
  40                 for_each_online_cpu(cpu) {
  41                         xen_setup_runstate_info(cpu);
  42                 }
  43         }
  44 #endif
  45 }
  46
  47 static void xen_pv_post_suspend(int suspend_cancelled)
  48 {
  49         xen_build_mfn_list_list();
  50
  51         xen_setup_shared_info();
  52
  53         if (suspend_cancelled) {
  54                 xen_start_info->store_mfn =
  55                         pfn_to_mfn(xen_start_info->store_mfn);
  56                 xen_start_info->console.domU.mfn =
  57                         pfn_to_mfn(xen_start_info->console.domU.mfn);
  58         } else {
  59 #ifdef CONFIG_SMP
  60                 BUG_ON(xen_cpu_initialized_map == NULL);
  61                 cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
  62 #endif
  63                 xen_vcpu_restore();
  64         }
  65
  66         xen_mm_unpin_all();
  67 }
  68
  69 void xen_arch_pre_suspend(void)
  70 {
  71     if (xen_pv_domain())
  72         xen_pv_pre_suspend();
  73 }
  74
  75 void xen_arch_post_suspend(int cancelled)
  76 {
  77     if (xen_pv_domain())
  78         xen_pv_post_suspend(cancelled);
  79     else
  80         xen_hvm_post_suspend(cancelled);
  81 }
  82
  83 static void xen_vcpu_notify_restore(void *data)
  84 {
  85         /* Boot processor notified via generic timekeeping_resume() */
  86         if (smp_processor_id() == 0)
  87                 return;
  88
  89         tick_resume_local();
  90 }
  91
  92 static void xen_vcpu_notify_suspend(void *data)
  93 {
  94         tick_suspend_local();
  95 }
  96
  97 void xen_arch_resume(void)
  98 {
  99         on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
 100 }
 101
 102 void xen_arch_suspend(void)
 103 {
 104         on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
 105 }