linux-kernel - [v5 15/19] KVM: eventfd: add irq bypass consumer management

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Date:	Mon, 13 Jul 2015 17:47:31 +0800
From:	Feng Wu <feng.wu@...el.com>
To:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	pbonzini@...hat.com, alex.williamson@...hat.com, joro@...tes.org,
	eric.auger@...aro.org, feng.wu@...el.com
Subject: [v5 15/19] KVM: eventfd: add irq bypass consumer management

From: Eric Auger <eric.auger@...aro.org>

This patch adds the registration/unregistration of an
irq_bypass_consumer on irqfd assignment/deassignment.

Signed-off-by: Eric Auger <eric.auger@...aro.org>
Signed-off-by: Feng Wu <feng.wu@...el.com>
---
 virt/kvm/eventfd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 647ffb8..4225eea 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -35,6 +35,7 @@
 #include <linux/srcu.h>
 #include <linux/slab.h>
 #include <linux/seqlock.h>
+#include <linux/irqbypass.h>
 #include <trace/events/kvm.h>
 
 #include <kvm/iodev.h>
@@ -140,6 +141,7 @@ irqfd_shutdown(struct work_struct *work)
 	/*
 	 * It is now safe to release the object's resources
 	 */
+	irq_bypass_unregister_consumer(&irqfd->consumer);
 	eventfd_ctx_put(irqfd->eventfd);
 	kfree(irqfd);
 }
@@ -380,6 +382,11 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
 	 */
 	fdput(f);
 
+	irqfd->consumer.token = (void *)irqfd->eventfd;
+	kvm_arch_irq_consumer_init(&irqfd->consumer);
+	ret = irq_bypass_register_consumer(&irqfd->consumer);
+	WARN_ON(ret);
+
 	return 0;
 
 fail:
-- 
2.1.0

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