LXR linux/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
  21static DEFINE_PER_CPU(u64, spec_ctrl);
  22
  23void 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
  31void 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
  41static 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
  53static 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
  66void 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
  76void 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}
  85