| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Kernel-based Virtual Machine driver for Linux |
| * |
| * Copyright 2016 Red Hat, Inc. and/or its affiliates. |
| */ |
| #include <linux/kvm_host.h> |
| #include <linux/debugfs.h> |
| #include "lapic.h" |
| #include "mmu.h" |
| #include "mmu/mmu_internal.h" |
| |
| static int vcpu_get_timer_advance_ns(void *data, u64 *val) |
| { |
| struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
| *val = vcpu->arch.apic->lapic_timer.timer_advance_ns; |
| return 0; |
| } |
| |
| DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n"); |
| |
| static int vcpu_get_guest_mode(void *data, u64 *val) |
| { |
| struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
| *val = vcpu->stat.guest_mode; |
| return 0; |
| } |
| |
| DEFINE_SIMPLE_ATTRIBUTE(vcpu_guest_mode_fops, vcpu_get_guest_mode, NULL, "%lld\n"); |
| |
| static int vcpu_get_tsc_offset(void *data, u64 *val) |
| { |
| struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
| *val = vcpu->arch.tsc_offset; |
| return 0; |
| } |
| |
| DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_offset_fops, vcpu_get_tsc_offset, NULL, "%lld\n"); |
| |
| static int vcpu_get_tsc_scaling_ratio(void *data, u64 *val) |
| { |
| struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data; |
| *val = vcpu->arch.tsc_scaling_ratio; |
| return 0; |
| } |
| |
| DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, "%llu\n"); |
| |
| static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val) |
| { |
| *val = kvm_tsc_scaling_ratio_frac_bits; |
| return 0; |
| } |
| |
| DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n"); |
| |
| void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) |
| { |
| debugfs_create_file("guest_mode", 0444, debugfs_dentry, vcpu, |
| &vcpu_guest_mode_fops); |
| debugfs_create_file("tsc-offset", 0444, debugfs_dentry, vcpu, |
| &vcpu_tsc_offset_fops); |
| |
| if (lapic_in_kernel(vcpu)) |
| debugfs_create_file("lapic_timer_advance_ns", 0444, |
| debugfs_dentry, vcpu, |
| &vcpu_timer_advance_ns_fops); |
| |
| if (kvm_has_tsc_control) { |
| debugfs_create_file("tsc-scaling-ratio", 0444, |
| debugfs_dentry, vcpu, |
| &vcpu_tsc_scaling_fops); |
| debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444, |
| debugfs_dentry, vcpu, |
| &vcpu_tsc_scaling_frac_fops); |
| } |
| } |
| |
| /* |
| * This covers statistics <1024 (11=log(1024)+1), which should be enough to |
| * cover RMAP_RECYCLE_THRESHOLD. |
| */ |
| #define RMAP_LOG_SIZE 11 |
| |
| static const char *kvm_lpage_str[KVM_NR_PAGE_SIZES] = { "4K", "2M", "1G" }; |
| |
| static int kvm_mmu_rmaps_stat_show(struct seq_file *m, void *v) |
| { |
| struct kvm_rmap_head *rmap; |
| struct kvm *kvm = m->private; |
| struct kvm_memory_slot *slot; |
| struct kvm_memslots *slots; |
| unsigned int lpage_size, index; |
| /* Still small enough to be on the stack */ |
| unsigned int *log[KVM_NR_PAGE_SIZES], *cur; |
| int i, j, k, l, ret; |
| |
| if (!kvm_memslots_have_rmaps(kvm)) |
| return 0; |
| |
| ret = -ENOMEM; |
| memset(log, 0, sizeof(log)); |
| for (i = 0; i < KVM_NR_PAGE_SIZES; i++) { |
| log[i] = kcalloc(RMAP_LOG_SIZE, sizeof(unsigned int), GFP_KERNEL); |
| if (!log[i]) |
| goto out; |
| } |
| |
| mutex_lock(&kvm->slots_lock); |
| write_lock(&kvm->mmu_lock); |
| |
| for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
| slots = __kvm_memslots(kvm, i); |
| for (j = 0; j < slots->used_slots; j++) { |
| slot = &slots->memslots[j]; |
| for (k = 0; k < KVM_NR_PAGE_SIZES; k++) { |
| rmap = slot->arch.rmap[k]; |
| lpage_size = kvm_mmu_slot_lpages(slot, k + 1); |
| cur = log[k]; |
| for (l = 0; l < lpage_size; l++) { |
| index = ffs(pte_list_count(&rmap[l])); |
| if (WARN_ON_ONCE(index >= RMAP_LOG_SIZE)) |
| index = RMAP_LOG_SIZE - 1; |
| cur[index]++; |
| } |
| } |
| } |
| } |
| |
| write_unlock(&kvm->mmu_lock); |
| mutex_unlock(&kvm->slots_lock); |
| |
| /* index=0 counts no rmap; index=1 counts 1 rmap */ |
| seq_printf(m, "Rmap_Count:\t0\t1\t"); |
| for (i = 2; i < RMAP_LOG_SIZE; i++) { |
| j = 1 << (i - 1); |
| k = (1 << i) - 1; |
| seq_printf(m, "%d-%d\t", j, k); |
| } |
| seq_printf(m, "\n"); |
| |
| for (i = 0; i < KVM_NR_PAGE_SIZES; i++) { |
| seq_printf(m, "Level=%s:\t", kvm_lpage_str[i]); |
| cur = log[i]; |
| for (j = 0; j < RMAP_LOG_SIZE; j++) |
| seq_printf(m, "%d\t", cur[j]); |
| seq_printf(m, "\n"); |
| } |
| |
| ret = 0; |
| out: |
| for (i = 0; i < KVM_NR_PAGE_SIZES; i++) |
| kfree(log[i]); |
| |
| return ret; |
| } |
| |
| static int kvm_mmu_rmaps_stat_open(struct inode *inode, struct file *file) |
| { |
| struct kvm *kvm = inode->i_private; |
| |
| if (!kvm_get_kvm_safe(kvm)) |
| return -ENOENT; |
| |
| return single_open(file, kvm_mmu_rmaps_stat_show, kvm); |
| } |
| |
| static int kvm_mmu_rmaps_stat_release(struct inode *inode, struct file *file) |
| { |
| struct kvm *kvm = inode->i_private; |
| |
| kvm_put_kvm(kvm); |
| |
| return single_release(inode, file); |
| } |
| |
| static const struct file_operations mmu_rmaps_stat_fops = { |
| .open = kvm_mmu_rmaps_stat_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = kvm_mmu_rmaps_stat_release, |
| }; |
| |
| int kvm_arch_create_vm_debugfs(struct kvm *kvm) |
| { |
| debugfs_create_file("mmu_rmaps_stat", 0644, kvm->debugfs_dentry, kvm, |
| &mmu_rmaps_stat_fops); |
| return 0; |
| } |