[PATCH] KVM: KVM_MAX_IRQ_ROUTES only defined with CONFIG_HAVE_KVM_IRQ_ROUTING

[Daniel Black]

Commit 36ae3c0a36b7 introduced code using KVM_MAX_IRQ_ROUTES. This
define isn't available on all platforms. As it is dependent on
CONFIG_HAVE_KVM_IRQ_ROUTING this define is used to enable the code
in 36ae3c0a36b7.

Fixes: 36ae3c0a36b7 ("KVM: Don't accept obviously wrong gsi values via 
KVM_IRQFD")
Reported-by: Abdul Haleem <abdha...@linux.vnet.ibm.com>
Suggested-by: Jan H. Schönherr <jscho...@amazon.de>
Signed-off-by: Daniel Black <daniel.bl...@au.ibm.com>
---
 virt/kvm/eventfd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index c608ab4..75910dd 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -565,8 +565,10 @@ kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
 {
        if (args->flags & ~(KVM_IRQFD_FLAG_DEASSIGN | KVM_IRQFD_FLAG_RESAMPLE))
                return -EINVAL;
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
        if (args->gsi >= KVM_MAX_IRQ_ROUTES)
                return -EINVAL;
+#endif
 
        if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)
                return kvm_irqfd_deassign(kvm, args);
-- 
2.9.5