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(suspend_cancelled: cancelled); |
35 | else |
36 | xen_hvm_post_suspend(suspend_cancelled: 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, val: 0); |
63 | } |
64 | } |
65 | |
66 | void 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 | |
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(func: xen_vcpu_notify_suspend, NULL, wait: 1); |
84 | } |
85 |