[PATCH v2 1/3] LoongArch: KVM: Add kvm_request_pending checking in kvm_late_check_requests()

[Bibo Mao]

Add kvm_request_pending() checking firstly in kvm_late_check_requests(),
at most time there is no pending request, the following pending bit
checking can be skipped then.

Also move function kvm_check_pmu() in kvm_late_check_requests(), and put
it after kvm_request_pending() checking.

Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
---
 arch/loongarch/kvm/vcpu.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 8ffd50a470e6..028eb3d5a33b 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -149,14 +149,6 @@ static void kvm_lose_pmu(struct kvm_vcpu *vcpu)
 	kvm_restore_host_pmu(vcpu);
 }
 
-static void kvm_check_pmu(struct kvm_vcpu *vcpu)
-{
-	if (kvm_check_request(KVM_REQ_PMU, vcpu)) {
-		kvm_own_pmu(vcpu);
-		vcpu->arch.aux_inuse |= KVM_LARCH_PMU;
-	}
-}
-
 static void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
 {
 	u32 version;
@@ -232,6 +224,14 @@ static int kvm_check_requests(struct kvm_vcpu *vcpu)
 static void kvm_late_check_requests(struct kvm_vcpu *vcpu)
 {
 	lockdep_assert_irqs_disabled();
+	if (!kvm_request_pending(vcpu))
+		return;
+
+	if (kvm_check_request(KVM_REQ_PMU, vcpu)) {
+		kvm_own_pmu(vcpu);
+		vcpu->arch.aux_inuse |= KVM_LARCH_PMU;
+	}
+
 	if (kvm_check_request(KVM_REQ_TLB_FLUSH_GPA, vcpu))
 		if (vcpu->arch.flush_gpa != INVALID_GPA) {
 			kvm_flush_tlb_gpa(vcpu, vcpu->arch.flush_gpa);
@@ -312,7 +312,6 @@ static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
 		/* Make sure the vcpu mode has been written */
 		smp_store_mb(vcpu->mode, IN_GUEST_MODE);
 		kvm_check_vpid(vcpu);
-		kvm_check_pmu(vcpu);
 
 		/*
 		 * Called after function kvm_check_vpid()
-- 
2.39.3