add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/kvm/debugfs.c
..
..
@@ -1,19 +1,21 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Kernel-based Virtual Machine driver for Linux
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  *
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  * Copyright 2016 Red Hat, Inc. and/or its affiliates.
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- *
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- * This work is licensed under the terms of the GNU GPL, version 2.  See
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- * the COPYING file in the top-level directory.
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- *
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  */
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 #include <linux/kvm_host.h>
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 #include <linux/debugfs.h>
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+#include "lapic.h"
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-bool kvm_arch_has_vcpu_debugfs(void)
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+static int vcpu_get_timer_advance_ns(void *data, u64 *val)
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 {
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-	return true;
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+	struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
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+	*val = vcpu->arch.apic->lapic_timer.timer_advance_ns;
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+	return 0;
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 }
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+
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+DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n");
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 static int vcpu_get_tsc_offset(void *data, u64 *val)
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 {
..
..
@@ -41,29 +43,22 @@
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43
 
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 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bits, NULL, "%llu\n");
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-int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
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+void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
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 {
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-	struct dentry *ret;
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+	debugfs_create_file("tsc-offset", 0444, debugfs_dentry, vcpu,
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+			    &vcpu_tsc_offset_fops);
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-	ret = debugfs_create_file("tsc-offset", 0444,
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-							vcpu->debugfs_dentry,
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-							vcpu, &vcpu_tsc_offset_fops);
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-	if (!ret)
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-		return -ENOMEM;
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+	if (lapic_in_kernel(vcpu))
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+		debugfs_create_file("lapic_timer_advance_ns", 0444,
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+				    debugfs_dentry, vcpu,
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+				    &vcpu_timer_advance_ns_fops);
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 	if (kvm_has_tsc_control) {
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-		ret = debugfs_create_file("tsc-scaling-ratio", 0444,
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-							vcpu->debugfs_dentry,
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-							vcpu, &vcpu_tsc_scaling_fops);
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-		if (!ret)
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-			return -ENOMEM;
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-		ret = debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444,
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-							vcpu->debugfs_dentry,
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-							vcpu, &vcpu_tsc_scaling_frac_fops);
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-		if (!ret)
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-			return -ENOMEM;
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-
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+		debugfs_create_file("tsc-scaling-ratio", 0444,
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+				    debugfs_dentry, vcpu,
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+				    &vcpu_tsc_scaling_fops);
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+		debugfs_create_file("tsc-scaling-ratio-frac-bits", 0444,
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+				    debugfs_dentry, vcpu,
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+				    &vcpu_tsc_scaling_frac_fops);
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 	}
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-
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-	return 0;
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 }