KVM: arm64: Convert to the generic perf callbacks

Drop arm64's version of the callbacks in favor of the callbacks provided
by generic KVM, which are semantically identical.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211111020738.2512932-15-seanjc@google.com

Author: sean-jc

arch/arm64/kvm/perf.c

@@ -13,42 +13,12 @@
 
 DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available);
 
-static unsigned int kvm_guest_state(void)
-{
-	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
-	unsigned int state;
-
-	if (!vcpu)
-		return 0;
-
-	state = PERF_GUEST_ACTIVE;
-	if (!vcpu_mode_priv(vcpu))
-		state |= PERF_GUEST_USER;
-
-	return state;
-}
-
-static unsigned long kvm_get_guest_ip(void)
-{
-	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
-
-	if (WARN_ON_ONCE(!vcpu))
-		return 0;
-
-	return *vcpu_pc(vcpu);
-}
-
-static struct perf_guest_info_callbacks kvm_guest_cbs = {
-	.state		= kvm_guest_state,
-	.get_ip		= kvm_get_guest_ip,
-};
-
 void kvm_perf_init(void)
 {
-	perf_register_guest_info_callbacks(&kvm_guest_cbs);
+	kvm_register_perf_callbacks(NULL);
 }
 
 void kvm_perf_teardown(void)
 {
-	perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
+	kvm_unregister_perf_callbacks();
 }