kernel/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         xen_hvm_init_shared_info();
  36         xen_callback_vector();
  37         xen_unplug_emulated_devices();
  38         if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
  39                 for_each_online_cpu(cpu) {
  40                         xen_setup_runstate_info(cpu);
  41                 }
  42         }
  43 #endif
  44 }
  45
  46 static void xen_pv_post_suspend(int suspend_cancelled)
  47 {
  48         xen_build_mfn_list_list();
  49
  50         xen_setup_shared_info();
  51
  52         if (suspend_cancelled) {
  53                 xen_start_info->store_mfn =
  54                         pfn_to_mfn(xen_start_info->store_mfn);
  55                 xen_start_info->console.domU.mfn =
  56                         pfn_to_mfn(xen_start_info->console.domU.mfn);
  57         } else {
  58 #ifdef CONFIG_SMP
  59                 BUG_ON(xen_cpu_initialized_map == NULL);
  60                 cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
  61 #endif
  62                 xen_vcpu_restore();
  63         }
  64
  65         xen_mm_unpin_all();
  66 }
  67
  68 void xen_arch_pre_suspend(void)
  69 {
  70     if (xen_pv_domain())
  71         xen_pv_pre_suspend();
  72 }
  73
  74 void xen_arch_post_suspend(int cancelled)
  75 {
  76     if (xen_pv_domain())
  77         xen_pv_post_suspend(cancelled);
  78     else
  79         xen_hvm_post_suspend(cancelled);
  80 }
  81
  82 static void xen_vcpu_notify_restore(void *data)
  83 {
  84         /* Boot processor notified via generic timekeeping_resume() */
  85         if (smp_processor_id() == 0)
  86                 return;
  87
  88         tick_resume_local();
  89 }
  90
  91 static void xen_vcpu_notify_suspend(void *data)
  92 {
  93         tick_suspend_local();
  94 }
  95
  96 void xen_arch_resume(void)
  97 {
  98         on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
  99 }
 100
 101 void xen_arch_suspend(void)
 102 {
 103         on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
 104 }