linux-kernel - [v4 RESEND 3/3] KVM: s390: don't setup dummy routing when KVM_CREATE

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Date: Fri, 26 Apr 2024 12:15:59 +0800
From: Yi Wang <up2wing@...il.com>
To: seanjc@...gle.com,
	pbonzini@...hat.com,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	wanpengli@...cent.com,
	foxywang@...cent.com,
	oliver.upton@...ux.dev,
	maz@...nel.org,
	anup@...infault.org,
	atishp@...shpatra.org,
	borntraeger@...ux.ibm.com,
	frankja@...ux.ibm.com,
	imbrenda@...ux.ibm.com,
	weijiang.yang@...el.com
Cc: up2wing@...il.com
Subject: [v4 RESEND 3/3] KVM: s390: don't setup dummy routing when KVM_CREATE_IRQCHIP

From: Yi Wang <foxywang@...cent.com>

As we have setup empty irq routing in kvm_create_vm(), there's
no need to setup dummy routing when KVM_CREATE_IRQCHIP.

Signed-off-by: Yi Wang <foxywang@...cent.com>
---
 arch/s390/kvm/kvm-s390.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 5147b943a864..ba7fd39bcbf4 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2998,14 +2998,7 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		break;
 	}
 	case KVM_CREATE_IRQCHIP: {
-		struct kvm_irq_routing_entry routing;
-
-		r = -EINVAL;
-		if (kvm->arch.use_irqchip) {
-			/* Set up dummy routing. */
-			memset(&routing, 0, sizeof(routing));
-			r = kvm_set_irq_routing(kvm, &routing, 0, 0);
-		}
+		r = 0;
 		break;
 	}
 	case KVM_SET_DEVICE_ATTR: {
-- 
2.39.3