aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorAlexander Graf <agraf@suse.de>2012-10-09 00:22:59 +0200
committerAlexander Graf <agraf@suse.de>2012-12-06 01:33:49 +0100
commit914daba865cb5c38cd5fdee024ca38029315b38f (patch)
tree5d0906d4fd82da801fb230256fc6bb1abb25bd0a
parent45e3cc7d9fe69844cd12d51c511e1e98d156bbe1 (diff)
downloadvexpress-lsk-914daba865cb5c38cd5fdee024ca38029315b38f.tar.gz
KVM: Distangle eventfd code from irqchip
The current eventfd code assumes that when we have eventfd, we also have irqfd for in-kernel interrupt delivery. This is not necessarily true. On PPC we don't have an in-kernel irqchip yet, but we can still support easily support eventfd. Signed-off-by: Alexander Graf <agraf@suse.de>
-rw-r--r--include/linux/kvm_host.h12
-rw-r--r--virt/kvm/eventfd.c6
2 files changed, 17 insertions, 1 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 8e5c7b65165..c823e47c364 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -900,10 +900,20 @@ static inline void kvm_free_irq_routing(struct kvm *kvm) {}
#ifdef CONFIG_HAVE_KVM_EVENTFD
void kvm_eventfd_init(struct kvm *kvm);
+int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
+
+#ifdef CONFIG_HAVE_KVM_IRQCHIP
int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
void kvm_irqfd_release(struct kvm *kvm);
void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
-int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);
+#else
+static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
+{
+ return -EINVAL;
+}
+
+static inline void kvm_irqfd_release(struct kvm *kvm) {}
+#endif
#else
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 9718e98d6d2..d7424c8c138 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -35,6 +35,7 @@
#include "iodev.h"
+#ifdef __KVM_HAVE_IOAPIC
/*
* --------------------------------------------------------------------
* irqfd: Allows an fd to be used to inject an interrupt to the guest
@@ -425,17 +426,21 @@ fail:
kfree(irqfd);
return ret;
}
+#endif
void
kvm_eventfd_init(struct kvm *kvm)
{
+#ifdef __KVM_HAVE_IOAPIC
spin_lock_init(&kvm->irqfds.lock);
INIT_LIST_HEAD(&kvm->irqfds.items);
INIT_LIST_HEAD(&kvm->irqfds.resampler_list);
mutex_init(&kvm->irqfds.resampler_lock);
+#endif
INIT_LIST_HEAD(&kvm->ioeventfds);
}
+#ifdef __KVM_HAVE_IOAPIC
/*
* shutdown any irqfd's that match fd+gsi
*/
@@ -555,6 +560,7 @@ static void __exit irqfd_module_exit(void)
module_init(irqfd_module_init);
module_exit(irqfd_module_exit);
+#endif
/*
* --------------------------------------------------------------------