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 } 70