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 
xen_arch_pre_suspend(void)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 
xen_arch_post_suspend(int cancelled)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 
xen_vcpu_notify_restore(void * data)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 
xen_vcpu_notify_suspend(void * data)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 
xen_arch_resume(void)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 
xen_arch_suspend(void)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