GNU Linux-libre 4.14.266-gnu1
[releases.git] / 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 }