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

From: Eric Auger
Date: Mon Jan 12 2015 - 08:41:50 EST


On 01/11/2015 10:17 PM, Christoffer Dall wrote:
> On Wed, Dec 03, 2014 at 05:07:11PM +0100, Eric Auger wrote:
>> 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;
>> +
>
> You can fold this into the patch that defines the static inline since
> nothing defines the KVM_HAVE_ARCH_... yet.
Not sure to understand what you mean:
__KVM_HAVE_ARCH_VIRTUAL_INTC_INITIALIZED was defined in previous patch
file (3/5). Nethertheless I can drop that patch file.

Thanks

Eric
>
>> irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL);
>> if (!irqfd)
>> return -ENOMEM;
>> --
>> 1.9.1
>>

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