arch/x86/kvm/debugfs.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * Copyright 2016 Red Hat, Inc. and/or its affiliates.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.  See
   7  * the COPYING file in the top-level directory.
   8  *
   9  */
  10 #include <linux/kvm_host.h>
  11 #include <linux/debugfs.h>
  12 #include "lapic.h"
  13
  14 bool kvm_arch_has_vcpu_debugfs(void)
  15 {
  16         return true;
  17 }
  18
  19 static int vcpu_get_timer_advance_ns(void *data, u64 *val)
  20 {
  21         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
  22         *val = vcpu->arch.apic->lapic_timer.timer_advance_ns;
  23         return 0;
  24 }
  25
  26 DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n");
  27
  28 static int vcpu_get_tsc_offset(void *data, u64 *val)
  29 {
  30         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
  31         *val = vcpu->arch.tsc_offset;
  32         return 0;
  33 }
  34
  35 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_offset_fops, vcpu_get_tsc_offset, NULL, "%lld\n");
  36
  37 static int vcpu_get_tsc_scaling_ratio(void *data, u64 *val)
  38 {
  39         struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
  40         *val = vcpu->arch.tsc_scaling_ratio;
  41         return 0;
  42 }
  43
  44 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_fops, vcpu_get_tsc_scaling_ratio, NULL, "%llu\n");
  45
  46 static int vcpu_get_tsc_scaling_frac_bits(void *data, u64 *val)
  47 {
  48         *val = kvm_tsc_scaling_ratio_frac_bits;
  49         return 0;
  50 }
  51
  52 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n");
  53
  54 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
  55 {
  56         struct dentry *ret;
  57
  58         ret = debugfs_create_file("tsc-offset", 0444,
  59                                                         vcpu->debugfs_dentry,
  60                                                         vcpu, &vcpu_tsc_offset_fops);
  61         if (!ret)
  62                 return -ENOMEM;
  63
  64         if (lapic_in_kernel(vcpu)) {
  65                 ret = debugfs_create_file("lapic_timer_advance_ns", 0444,
  66                                                                 vcpu->debugfs_dentry,
  67                                                                 vcpu, &vcpu_timer_advance_ns_fops);
  68                 if (!ret)
  69                         return -ENOMEM;
  70         }
  71
  72         if (kvm_has_tsc_control) {
  73                 ret = debugfs_create_file("tsc-scaling-ratio", 0444,
  74                                                         vcpu->debugfs_dentry,
  75                                                         vcpu, &vcpu_tsc_scaling_fops);
  76                 if (!ret)
  77                         return -ENOMEM;
  78                 ret = debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444,
  79                                                         vcpu->debugfs_dentry,
  80                                                         vcpu, &vcpu_tsc_scaling_frac_fops);
  81                 if (!ret)
  82                         return -ENOMEM;
  83
  84         }
  85
  86         return 0;
  87 }