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Commit 16ba3ab4 authored by Wanpeng Li's avatar Wanpeng Li Committed by Paolo Bonzini
Browse files

KVM: LAPIC: Expose per-vCPU timer_advance_ns to userspace 



Expose per-vCPU timer_advance_ns to userspace, so it is able to
query the auto-adjusted value.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Liran Alon <liran.alon@oracle.com>
Signed-off-by: default avatarWanpeng Li <wanpengli@tencent.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 0e6edceb

arch/x86/kvm/debugfs.c

+18 −0
Original line number Original line Diff line number Diff line
@@ -9,12 +9,22 @@ 
 */

 */

#include <linux/kvm_host.h>

#include <linux/kvm_host.h>

#include <linux/debugfs.h>

#include <linux/debugfs.h>

#include "lapic.h"





bool kvm_arch_has_vcpu_debugfs(void)

bool kvm_arch_has_vcpu_debugfs(void)

{

{

	return true;

	return true;

}

}





static int vcpu_get_timer_advance_ns(void *data, u64 *val)

{

	struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;

	*val = vcpu->arch.apic->lapic_timer.timer_advance_ns;

	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n");



static int vcpu_get_tsc_offset(void *data, u64 *val)

static int vcpu_get_tsc_offset(void *data, u64 *val)

{

{

	struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;

	struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
@@ -51,6 +61,14 @@ int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu) 
	if (!ret)

	if (!ret)

		return -ENOMEM;

		return -ENOMEM;





	if (lapic_in_kernel(vcpu)) {

		ret = debugfs_create_file("lapic_timer_advance_ns", 0444,

								vcpu->debugfs_dentry,

								vcpu, &vcpu_timer_advance_ns_fops);

		if (!ret)

			return -ENOMEM;

	}



	if (kvm_has_tsc_control) {

	if (kvm_has_tsc_control) {

		ret = debugfs_create_file("tsc-scaling-ratio", 0444,

		ret = debugfs_create_file("tsc-scaling-ratio", 0444,

							vcpu->debugfs_dentry,

							vcpu->debugfs_dentry,