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authorWanpeng Li <wanpengli@tencent.com>2019-05-20 16:18:07 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2019-05-24 21:27:09 +0200
commit16ba3ab4e15ca031270deb3cbfd38416c719e291 (patch)
treed217faa4c68976587d6d3791dbfb6679fb5cc4f2
parent0e6edceb8f18a4e31526d83e6099fef1f29c3af5 (diff)
downloadlinux-stericsson-16ba3ab4e15ca031270deb3cbfd38416c719e291.tar.gz
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: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/x86/kvm/debugfs.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c
index c19c7ede9bd6..a2f3432ce090 100644
--- a/arch/x86/kvm/debugfs.c
+++ b/arch/x86/kvm/debugfs.c
@@ -9,12 +9,22 @@
*/
#include <linux/kvm_host.h>
#include <linux/debugfs.h>
+#include "lapic.h"
bool kvm_arch_has_vcpu_debugfs(void)
{
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)
{
struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
@@ -51,6 +61,14 @@ int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
if (!ret)
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) {
ret = debugfs_create_file("tsc-scaling-ratio", 0444,
vcpu->debugfs_dentry,