linux-kernel - [v2 2/4] KVM: setup empty irq routing when create vm

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Message-Id: <20240121111730.262429-3-foxywang@tencent.com>
Date: Sun, 21 Jan 2024 19:17:28 +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
Cc: up2wing@...il.com
Subject: [v2 2/4] KVM: setup empty irq routing when create vm

Setup empty irq routing when kvm_create_vm(), so that x86 and s390
no longer need to set empty/dummy irq routing when creating an
IRQCHIP 'cause it avoid an synchronize_srcu.

Signed-off-by: Yi Wang <foxywang@...cent.com>
---
 virt/kvm/kvm_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 7db96875ac46..db1b13fc0502 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1242,6 +1242,10 @@ static struct kvm *kvm_create_vm(unsigned long type, const char *fdname)
 	if (r)
 		goto out_err;
 
+	r = kvm_setup_empty_irq_routing_lockless(kvm);
+	if (r)
+		goto out_err;
+
 	mutex_lock(&kvm_lock);
 	list_add(&kvm->vm_list, &vm_list);
 	mutex_unlock(&kvm_lock);
-- 
2.39.3