Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
13bool kvm_arch_has_vcpu_debugfs(void)
14{
15 return true;
16}
17
18static 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
25DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_offset_fops, vcpu_get_tsc_offset, NULL, "%lld\n");
26
27static 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
34DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, "%llu\n");
35
36static 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
42DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n");
43
44int 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}