arch/x86/xen/suspend.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/tick.h>
   4 #include <linux/percpu-defs.h>
   5
   6 #include <xen/xen.h>
   7 #include <xen/interface/xen.h>
   8 #include <xen/grant_table.h>
   9 #include <xen/events.h>
  10
  11 #include <asm/cpufeatures.h>
  12 #include <asm/msr-index.h>
  13 #include <asm/xen/hypercall.h>
  14 #include <asm/xen/page.h>
  15 #include <asm/fixmap.h>
  16
  17 #include "xen-ops.h"
  18
  19 static DEFINE_PER_CPU(u64, spec_ctrl);
  20
  21 void xen_arch_pre_suspend(void)
  22 {
  23         xen_save_time_memory_area();
  24
  25         if (xen_pv_domain())
  26                 xen_pv_pre_suspend();
  27 }
  28
  29 void xen_arch_post_suspend(int cancelled)
  30 {
  31         if (xen_pv_domain())
  32                 xen_pv_post_suspend(cancelled);
  33         else
  34                 xen_hvm_post_suspend(cancelled);
  35
  36         xen_restore_time_memory_area();
  37 }
  38
  39 static void xen_vcpu_notify_restore(void *data)
  40 {
  41         if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL))
  42                 wrmsrl(MSR_IA32_SPEC_CTRL, this_cpu_read(spec_ctrl));
  43
  44         /* Boot processor notified via generic timekeeping_resume() */
  45         if (smp_processor_id() == 0)
  46                 return;
  47
  48         tick_resume_local();
  49 }
  50
  51 static void xen_vcpu_notify_suspend(void *data)
  52 {
  53         u64 tmp;
  54
  55         tick_suspend_local();
  56
  57         if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) {
  58                 rdmsrl(MSR_IA32_SPEC_CTRL, tmp);
  59                 this_cpu_write(spec_ctrl, tmp);
  60                 wrmsrl(MSR_IA32_SPEC_CTRL, 0);
  61         }
  62 }
  63
  64 void xen_arch_resume(void)
  65 {
  66         int cpu;
  67
  68         on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
  69
  70         for_each_online_cpu(cpu)
  71                 xen_pmu_init(cpu);
  72 }
  73
  74 void xen_arch_suspend(void)
  75 {
  76         int cpu;
  77
  78         for_each_online_cpu(cpu)
  79                 xen_pmu_finish(cpu);
  80
  81         on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
  82 }