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