linux-kernel - [PATCH 2/2] KVM: s390: Use kvm_vcpu_wake_up in kvm_s390_vcpu

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Message-Id: <1563457031-21189-3-git-send-email-pbonzini@redhat.com>
Date:   Thu, 18 Jul 2019 15:37:11 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     wanpengli@...cent.com, rkrcmar@...hat.com, borntraeger@...ibm.com,
        paulus@...abs.org, maz@...nel.org
Subject: [PATCH 2/2] KVM: s390: Use kvm_vcpu_wake_up in kvm_s390_vcpu_wakeup

From: Wanpeng Li <wanpengli@...cent.com>

Use kvm_vcpu_wake_up() in kvm_s390_vcpu_wakeup().

Suggested-by: Paolo Bonzini <pbonzini@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
	v2->v3: no need to set vcpu->ready here
 arch/s390/kvm/interrupt.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 26f8bf4a22a7..b5fd6e85657c 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -1224,28 +1224,11 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 
 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 {
-	/*
-	 * We cannot move this into the if, as the CPU might be already
-	 * in kvm_vcpu_block without having the waitqueue set (polling)
-	 */
 	vcpu->valid_wakeup = true;
+	kvm_vcpu_wake_up(vcpu);
+
 	/*
-	 * This is mostly to document, that the read in swait_active could
-	 * be moved before other stores, leading to subtle races.
-	 * All current users do not store or use an atomic like update
-	 */
-	smp_mb__after_atomic();
-	if (swait_active(&vcpu->wq)) {
-		/*
-		 * The vcpu gave up the cpu voluntarily, mark it as a good
-		 * yield-candidate.
-		 */
-		WRITE_ONCE(vcpu->ready, true);
-		swake_up_one(&vcpu->wq);
-		vcpu->stat.halt_wakeup++;
-	}
-	/*
-	 * The VCPU might not be sleeping but is executing the VSIE. Let's
+	 * The VCPU might not be sleeping but rather executing VSIE. Let's
 	 * kick it, so it leaves the SIE to process the request.
 	 */
 	kvm_s390_vsie_kick(vcpu);
-- 
1.8.3.1