[PATCH v5 4/5] KVM: irqfd: use kvm_arch_is_virtual_intc_initialized

From: Eric Auger
Date: Wed Dec 03 2014 - 11:11:40 EST

On arm/arm64, the interrupt controller is dynamically instantiated.
There is a risk the user-space assigns an irqfd before this latter
is initialized and ready to accept virtual irq injection. On such
attempt, the IRQFD setup is rejected and -EAGAIN is returned.

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
virt/kvm/eventfd.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index b0fb390..f837c83 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -314,6 +314,9 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
unsigned int events;
int idx;

+ if (!kvm_arch_is_virtual_intc_initialized(kvm))
+ return -EAGAIN;
irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL);
if (!irqfd)
return -ENOMEM;

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