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 #include "mmu.h"
  19 #include "pmu.h"
  20
  21 static DEFINE_PER_CPU(u64, spec_ctrl);
  22
  23 void xen_arch_pre_suspend(void)
  24 {
  25         xen_save_time_memory_area();
  26
  27         if (xen_pv_domain())
  28                 xen_pv_pre_suspend();
  29 }
  30
  31 void xen_arch_post_suspend(int cancelled)
  32 {
  33         if (xen_pv_domain())
  34                 xen_pv_post_suspend(cancelled);
  35         else
  36                 xen_hvm_post_suspend(cancelled);
  37
  38         xen_restore_time_memory_area();
  39 }
  40
  41 static void xen_vcpu_notify_restore(void *data)
  42 {
  43         if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL))
  44                 wrmsrl(MSR_IA32_SPEC_CTRL, this_cpu_read(spec_ctrl));
  45
  46         /* Boot processor notified via generic timekeeping_resume() */
  47         if (smp_processor_id() == 0)
  48                 return;
  49
  50         tick_resume_local();
  51 }
  52
  53 static void xen_vcpu_notify_suspend(void *data)
  54 {
  55         u64 tmp;
  56
  57         tick_suspend_local();
  58
  59         if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) {
  60                 rdmsrl(MSR_IA32_SPEC_CTRL, tmp);
  61                 this_cpu_write(spec_ctrl, tmp);
  62                 wrmsrl(MSR_IA32_SPEC_CTRL, 0);
  63         }
  64 }
  65
  66 void xen_arch_resume(void)
  67 {
  68         int cpu;
  69
  70         on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
  71
  72         for_each_online_cpu(cpu)
  73                 xen_pmu_init(cpu);
  74 }
  75
  76 void xen_arch_suspend(void)
  77 {
  78         int cpu;
  79
  80         for_each_online_cpu(cpu)
  81                 xen_pmu_finish(cpu);
  82
  83         on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
  84 }