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