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