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 } 88