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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2011-11-28 16:41:00 +0400
committerAvi Kivity <avi@redhat.com>2011-12-27 13:22:05 +0400
commit0375f7fad904b59502341ccecfc8faea70b34c91 (patch)
tree23de875b6c9d4cb267738860dc27db1289bee1fa /arch/x86/kvm/mmu_audit.c
parenta65cf5181aa608addcb2873c8ed90413a9f539cb (diff)
downloadlinux-0375f7fad904b59502341ccecfc8faea70b34c91.tar.xz
KVM: MMU: audit: replace mmu audit tracepoint with jump-label
The tracepoint is only used to audit mmu code, it should not be exposed to user, let us replace it with jump-label. Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu_audit.c')
-rw-r--r--arch/x86/kvm/mmu_audit.c28
1 files changed, 13 insertions, 15 deletions
diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c
index 746ec259d024..5df6736a5afb 100644
--- a/arch/x86/kvm/mmu_audit.c
+++ b/arch/x86/kvm/mmu_audit.c
@@ -224,30 +224,29 @@ static void audit_vcpu_spte(struct kvm_vcpu *vcpu)
mmu_spte_walk(vcpu, audit_spte);
}
-static void kvm_mmu_audit(void *ignore, struct kvm_vcpu *vcpu, int point)
+static bool mmu_audit;
+static struct jump_label_key mmu_audit_key;
+
+static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point)
{
static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10);
- if (!__ratelimit(&ratelimit_state))
- return;
+ if (static_branch((&mmu_audit_key))) {
+ if (!__ratelimit(&ratelimit_state))
+ return;
- vcpu->kvm->arch.audit_point = point;
- audit_all_active_sps(vcpu->kvm);
- audit_vcpu_spte(vcpu);
+ vcpu->kvm->arch.audit_point = point;
+ audit_all_active_sps(vcpu->kvm);
+ audit_vcpu_spte(vcpu);
+ }
}
-static bool mmu_audit;
-
static void mmu_audit_enable(void)
{
- int ret;
-
if (mmu_audit)
return;
- ret = register_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
- WARN_ON(ret);
-
+ jump_label_inc(&mmu_audit_key);
mmu_audit = true;
}
@@ -256,8 +255,7 @@ static void mmu_audit_disable(void)
if (!mmu_audit)
return;
- unregister_trace_kvm_mmu_audit(kvm_mmu_audit, NULL);
- tracepoint_synchronize_unregister();
+ jump_label_dec(&mmu_audit_key);
mmu_audit = false;
}