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