KVM: eventfd: add irq bypass consumer management
This patch adds the registration/unregistration of an
irq_bypass_consumer on irqfd assignment/deassignment.
Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Feng Wu <feng.wu@intel.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index c4f7abe..7df356d 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 +141,9 @@
/*
* It is now safe to release the object's resources
*/
+#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
+ irq_bypass_unregister_consumer(&irqfd->consumer);
+#endif
eventfd_ctx_put(irqfd->eventfd);
kfree(irqfd);
}
@@ -391,6 +395,17 @@
* we might race against the POLLHUP
*/
fdput(f);
+#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
+ irqfd->consumer.token = (void *)irqfd->eventfd;
+ irqfd->consumer.add_producer = kvm_arch_irq_bypass_add_producer;
+ irqfd->consumer.del_producer = kvm_arch_irq_bypass_del_producer;
+ irqfd->consumer.stop = kvm_arch_irq_bypass_stop;
+ irqfd->consumer.start = kvm_arch_irq_bypass_start;
+ ret = irq_bypass_register_consumer(&irqfd->consumer);
+ if (ret)
+ pr_info("irq bypass consumer (token %p) registration fails: %d\n",
+ irqfd->consumer.token, ret);
+#endif
return 0;