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Date: Wed, 3 Dec 2014 17:07:11 +0100 From: Eric Auger <eric.auger@...aro.org> To: eric.auger@...com, eric.auger@...aro.org, christoffer.dall@...aro.org, marc.zyngier@....com, linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org, alex.williamson@...hat.com, agraf@...e.de, joel.schopp@....com, gleb@...nel.org, pbonzini@...hat.com, borntraeger@...ibm.com, cornelia.huck@...ibm.com Cc: linux-kernel@...r.kernel.org, patches@...aro.org, a.motakis@...tualopensystems.com Subject: [PATCH v5 4/5] KVM: irqfd: use kvm_arch_is_virtual_intc_initialized 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@...aro.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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