Re: [Qemu-devel] [PATCH v2 5/5] KVM: Bump KVM_MAX_IRQ_ROUTES for s390

[Paolo Bonzini <pbonzini@redhat.com>]

Il 17/03/2014 19:11, Cornelia Huck ha scritto:
> The maximum number for irq routes is currently 1024, which is a bit on
> the small size for s390: We support up to 4 x 64k virtual devices with
> up to 64 queues, and we need one route for each of the queues if we want
> to operate it via irqfd.
>
> Let's bump this to 4k on s390 for now, as this at least covers the saner
> setups.
>
> We need to find a more general solution, though, as we can't just grow
> the routing table indefinitly.
>
> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
> ---
>  include/linux/kvm_host.h |    4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index da7510b..7d21cf9 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -922,7 +922,11 @@ static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
>
>  #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
>
> +#ifdef CONFIG_S390
> +#define KVM_MAX_IRQ_ROUTES 4096 //FIXME: we can have more than that...
> +#else
>  #define KVM_MAX_IRQ_ROUTES 1024
> +#endif
>
>  int kvm_setup_default_irq_routing(struct kvm *kvm);
>  int kvm_set_irq_routing(struct kvm *kvm,
>

Acked-by: Paolo Bonzini <pbonzini@redhat.com>