From mboxrd@z Thu Jan 1 00:00:00 1970 From: eric.auger@linaro.org (Eric Auger) Date: Wed, 3 Dec 2014 17:07:11 +0100 Subject: [PATCH v5 4/5] KVM: irqfd: use kvm_arch_is_virtual_intc_initialized In-Reply-To: <1417622832-5460-1-git-send-email-eric.auger@linaro.org> References: <1417622832-5460-1-git-send-email-eric.auger@linaro.org> Message-ID: <1417622832-5460-5-git-send-email-eric.auger@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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