1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Kernel-based Virtual Machine driver for Linux
4 *
5 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
6 */
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/kvm_host.h>
10#include <linux/debugfs.h>
11#include "lapic.h"
12#include "mmu.h"
13#include "mmu/mmu_internal.h"
14
15static int vcpu_get_timer_advance_ns(void *data, u64 *val)
16{
17 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
18 *val = vcpu->arch.apic->lapic_timer.timer_advance_ns;
19 return 0;
20}
21
22DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n");
23
24static int vcpu_get_guest_mode(void *data, u64 *val)
25{
26 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
27 *val = vcpu->stat.guest_mode;
28 return 0;
29}
30
31DEFINE_SIMPLE_ATTRIBUTE(vcpu_guest_mode_fops, vcpu_get_guest_mode, NULL, "%lld\n");
32
33static int vcpu_get_tsc_offset(void *data, u64 *val)
34{
35 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
36 *val = vcpu->arch.tsc_offset;
37 return 0;
38}
39
40DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_offset_fops, vcpu_get_tsc_offset, NULL, "%lld\n");
41
42static int vcpu_get_tsc_scaling_ratio(void *data, u64 *val)
43{
44 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
45 *val = vcpu->arch.tsc_scaling_ratio;
46 return 0;
47}
48
49DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, "%llu\n");
50
51static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val)
52{
53 *val = kvm_caps.tsc_scaling_ratio_frac_bits;
54 return 0;
55}
56
57DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n");
58
59void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
60{
61 debugfs_create_file("guest_mode", 0444, debugfs_dentry, vcpu,
62 &vcpu_guest_mode_fops);
63 debugfs_create_file("tsc-offset", 0444, debugfs_dentry, vcpu,
64 &vcpu_tsc_offset_fops);
65
66 if (lapic_in_kernel(vcpu))
67 debugfs_create_file("lapic_timer_advance_ns", 0444,
68 debugfs_dentry, vcpu,
69 &vcpu_timer_advance_ns_fops);
70
71 if (kvm_caps.has_tsc_control) {
72 debugfs_create_file("tsc-scaling-ratio", 0444,
73 debugfs_dentry, vcpu,
74 &vcpu_tsc_scaling_fops);
75 debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444,
76 debugfs_dentry, vcpu,
77 &vcpu_tsc_scaling_frac_fops);
78 }
79}
80
81/*
82 * This covers statistics <1024 (11=log(1024)+1), which should be enough to
83 * cover RMAP_RECYCLE_THRESHOLD.
84 */
85#define RMAP_LOG_SIZE 11
86
87static const char *kvm_lpage_str[KVM_NR_PAGE_SIZES] = { "4K", "2M", "1G" };
88
89static int kvm_mmu_rmaps_stat_show(struct seq_file *m, void *v)
90{
91 struct kvm_rmap_head *rmap;
92 struct kvm *kvm = m->private;
93 struct kvm_memory_slot *slot;
94 struct kvm_memslots *slots;
95 unsigned int lpage_size, index;
96 /* Still small enough to be on the stack */
97 unsigned int *log[KVM_NR_PAGE_SIZES], *cur;
98 int i, j, k, l, ret;
99
100 if (!kvm_memslots_have_rmaps(kvm))
101 return 0;
102
103 ret = -ENOMEM;
104 memset(log, 0, sizeof(log));
105 for (i = 0; i < KVM_NR_PAGE_SIZES; i++) {
106 log[i] = kcalloc(RMAP_LOG_SIZE, sizeof(unsigned int), GFP_KERNEL);
107 if (!log[i])
108 goto out;
109 }
110
111 mutex_lock(&kvm->slots_lock);
112 write_lock(&kvm->mmu_lock);
113
114 for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
115 int bkt;
116
117 slots = __kvm_memslots(kvm, as_id: i);
118 kvm_for_each_memslot(slot, bkt, slots)
119 for (k = 0; k < KVM_NR_PAGE_SIZES; k++) {
120 rmap = slot->arch.rmap[k];
121 lpage_size = kvm_mmu_slot_lpages(slot, level: k + 1);
122 cur = log[k];
123 for (l = 0; l < lpage_size; l++) {
124 index = ffs(pte_list_count(&rmap[l]));
125 if (WARN_ON_ONCE(index >= RMAP_LOG_SIZE))
126 index = RMAP_LOG_SIZE - 1;
127 cur[index]++;
128 }
129 }
130 }
131
132 write_unlock(&kvm->mmu_lock);
133 mutex_unlock(lock: &kvm->slots_lock);
134
135 /* index=0 counts no rmap; index=1 counts 1 rmap */
136 seq_printf(m, fmt: "Rmap_Count:\t0\t1\t");
137 for (i = 2; i < RMAP_LOG_SIZE; i++) {
138 j = 1 << (i - 1);
139 k = (1 << i) - 1;
140 seq_printf(m, fmt: "%d-%d\t", j, k);
141 }
142 seq_printf(m, fmt: "\n");
143
144 for (i = 0; i < KVM_NR_PAGE_SIZES; i++) {
145 seq_printf(m, fmt: "Level=%s:\t", kvm_lpage_str[i]);
146 cur = log[i];
147 for (j = 0; j < RMAP_LOG_SIZE; j++)
148 seq_printf(m, fmt: "%d\t", cur[j]);
149 seq_printf(m, fmt: "\n");
150 }
151
152 ret = 0;
153out:
154 for (i = 0; i < KVM_NR_PAGE_SIZES; i++)
155 kfree(objp: log[i]);
156
157 return ret;
158}
159
160static int kvm_mmu_rmaps_stat_open(struct inode *inode, struct file *file)
161{
162 struct kvm *kvm = inode->i_private;
163 int r;
164
165 if (!kvm_get_kvm_safe(kvm))
166 return -ENOENT;
167
168 r = single_open(file, kvm_mmu_rmaps_stat_show, kvm);
169 if (r < 0)
170 kvm_put_kvm(kvm);
171
172 return r;
173}
174
175static int kvm_mmu_rmaps_stat_release(struct inode *inode, struct file *file)
176{
177 struct kvm *kvm = inode->i_private;
178
179 kvm_put_kvm(kvm);
180
181 return single_release(inode, file);
182}
183
184static const struct file_operations mmu_rmaps_stat_fops = {
185 .owner = THIS_MODULE,
186 .open = kvm_mmu_rmaps_stat_open,
187 .read = seq_read,
188 .llseek = seq_lseek,
189 .release = kvm_mmu_rmaps_stat_release,
190};
191
192void kvm_arch_create_vm_debugfs(struct kvm *kvm)
193{
194 debugfs_create_file("mmu_rmaps_stat", 0644, kvm->debugfs_dentry, kvm,
195 &mmu_rmaps_stat_fops);
196}
197

source code of linux/arch/x86/kvm/debugfs.c