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 void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu) 47 { 48 debugfs_create_file("tsc-offset", 0444, vcpu->debugfs_dentry, vcpu, 49 &vcpu_tsc_offset_fops); 50 51 if (lapic_in_kernel(vcpu)) 52 debugfs_create_file("lapic_timer_advance_ns", 0444, 53 vcpu->debugfs_dentry, vcpu, 54 &vcpu_timer_advance_ns_fops); 55 56 if (kvm_has_tsc_control) { 57 debugfs_create_file("tsc-scaling-ratio", 0444, 58 vcpu->debugfs_dentry, vcpu, 59 &vcpu_tsc_scaling_fops); 60 debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444, 61 vcpu->debugfs_dentry, vcpu, 62 &vcpu_tsc_scaling_frac_fops); 63 } 64 } 65