GNU Linux-libre 4.14.266-gnu1
[releases.git] / arch / x86 / kvm / debugfs.c
1 /*
2  * Kernel-based Virtual Machine driver for Linux
3  *
4  * Copyright 2016 Red Hat, Inc. and/or its affiliates.
5  *
6  * This work is licensed under the terms of the GNU GPL, version 2.  See
7  * the COPYING file in the top-level directory.
8  *
9  */
10 #include <linux/kvm_host.h>
11 #include <linux/debugfs.h>
12
13 bool kvm_arch_has_vcpu_debugfs(void)
14 {
15         return true;
16 }
17
18 static int vcpu_get_tsc_offset(void *data, u64 *val)
19 {
20         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
21         *val = vcpu->arch.tsc_offset;
22         return 0;
23 }
24
25 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_offset_fops, vcpu_get_tsc_offset, NULL, "%lld\n");
26
27 static int vcpu_get_tsc_scaling_ratio(void *data, u64 *val)
28 {
29         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
30         *val = vcpu->arch.tsc_scaling_ratio;
31         return 0;
32 }
33
34 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, "%llu\n");
35
36 static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val)
37 {
38         *val = kvm_tsc_scaling_ratio_frac_bits;
39         return 0;
40 }
41
42 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n");
43
44 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
45 {
46         struct dentry *ret;
47
48         ret = debugfs_create_file("tsc-offset", 0444,
49                                                         vcpu->debugfs_dentry,
50                                                         vcpu, &vcpu_tsc_offset_fops);
51         if (!ret)
52                 return -ENOMEM;
53
54         if (kvm_has_tsc_control) {
55                 ret = debugfs_create_file("tsc-scaling-ratio", 0444,
56                                                         vcpu->debugfs_dentry,
57                                                         vcpu, &vcpu_tsc_scaling_fops);
58                 if (!ret)
59                         return -ENOMEM;
60                 ret = debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444,
61                                                         vcpu->debugfs_dentry,
62                                                         vcpu, &vcpu_tsc_scaling_frac_fops);
63                 if (!ret)
64                         return -ENOMEM;
65
66         }
67
68         return 0;
69 }