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.au...@linaro.org>
---
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;
--
1.9.1
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