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 #include <asm/msr.h>
  17
  18 #include "xen-ops.h"
  19
  20 static DEFINE_PER_CPU(u64, spec_ctrl);
  21
  22 void xen_arch_pre_suspend(void)
  23 {
  24         xen_save_time_memory_area();
  25
  26         if (xen_pv_domain())
  27                 xen_pv_pre_suspend();
  28 }
  29
  30 void xen_arch_post_suspend(int cancelled)
  31 {
  32         if (xen_pv_domain())
  33                 xen_pv_post_suspend(cancelled);
  34         else
  35                 xen_hvm_post_suspend(cancelled);
  36
  37         xen_restore_time_memory_area();
  38 }
  39
  40 static void xen_vcpu_notify_restore(void *data)
  41 {
  42         if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL))
  43                 wrmsrq(MSR_IA32_SPEC_CTRL, this_cpu_read(spec_ctrl));
  44
  45         /* Boot processor notified via generic timekeeping_resume() */
  46         if (smp_processor_id() == 0)
  47                 return;
  48
  49         tick_resume_local();
  50 }
  51
  52 static void xen_vcpu_notify_suspend(void *data)
  53 {
  54         u64 tmp;
  55
  56         tick_suspend_local();
  57
  58         if (xen_pv_domain() && boot_cpu_has(X86_FEATURE_SPEC_CTRL)) {
  59                 rdmsrq(MSR_IA32_SPEC_CTRL, tmp);
  60                 this_cpu_write(spec_ctrl, tmp);
  61                 wrmsrq(MSR_IA32_SPEC_CTRL, 0);
  62         }
  63 }
  64
  65 void xen_arch_resume(void)
  66 {
  67         int cpu;
  68
  69         on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
  70
  71         for_each_online_cpu(cpu)
  72                 xen_pmu_init(cpu);
  73 }
  74
  75 void xen_arch_suspend(void)
  76 {
  77         int cpu;
  78
  79         for_each_online_cpu(cpu)
  80                 xen_pmu_finish(cpu);
  81
  82         on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
  83 }