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(suspend_cancelled: cancelled);
35 else
36 xen_hvm_post_suspend(suspend_cancelled: 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, val: 0);
63 }
64}
65
66void xen_arch_resume(void)
67{
68 int cpu;
69
70 on_each_cpu(func: xen_vcpu_notify_restore, NULL, wait: 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(func: xen_vcpu_notify_suspend, NULL, wait: 1);
84}
85

source code of linux/arch/x86/xen/suspend.c