arch/x86/kvm/debugfs.c

   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
  11 bool kvm_arch_has_vcpu_debugfs(void)
  12 {
  13         return true;
  14 }
  15
  16 static int vcpu_get_timer_advance_ns(void *data, u64 *val)
  17 {
  18         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
  19         *val = vcpu->arch.apic->lapic_timer.timer_advance_ns;
  20         return 0;
  21 }
  22
  23 DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n");
  24
  25 static int vcpu_get_tsc_offset(void *data, u64 *val)
  26 {
  27         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
  28         *val = vcpu->arch.tsc_offset;
  29         return 0;
  30 }
  31
  32 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_offset_fops, vcpu_get_tsc_offset, NULL, "%lld\n");
  33
  34 static int vcpu_get_tsc_scaling_ratio(void *data, u64 *val)
  35 {
  36         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
  37         *val = vcpu->arch.tsc_scaling_ratio;
  38         return 0;
  39 }
  40
  41 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, "%llu\n");
  42
  43 static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val)
  44 {
  45         *val = kvm_tsc_scaling_ratio_frac_bits;
  46         return 0;
  47 }
  48
  49 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n");
  50
  51 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
  52 {
  53         struct dentry *ret;
  54
  55         ret = debugfs_create_file("tsc-offset", 0444,
  56                                                         vcpu->debugfs_dentry,
  57                                                         vcpu, &vcpu_tsc_offset_fops);
  58         if (!ret)
  59                 return -ENOMEM;
  60
  61         if (lapic_in_kernel(vcpu)) {
  62                 ret = debugfs_create_file("lapic_timer_advance_ns", 0444,
  63                                                                 vcpu->debugfs_dentry,
  64                                                                 vcpu, &vcpu_timer_advance_ns_fops);
  65                 if (!ret)
  66                         return -ENOMEM;
  67         }
  68
  69         if (kvm_has_tsc_control) {
  70                 ret = debugfs_create_file("tsc-scaling-ratio", 0444,
  71                                                         vcpu->debugfs_dentry,
  72                                                         vcpu, &vcpu_tsc_scaling_fops);
  73                 if (!ret)
  74                         return -ENOMEM;
  75                 ret = debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444,
  76                                                         vcpu->debugfs_dentry,
  77                                                         vcpu, &vcpu_tsc_scaling_frac_fops);
  78                 if (!ret)
  79                         return -ENOMEM;
  80
  81         }
  82
  83         return 0;
  84 }