Ok, let's see how this flies. I actually quite like this, so be gentle tearing it apart ;) I just couldn't bring myself to contort KVM_IRQFD into something that either sets up an irqfd or specifies a nearly unrelated EOI eventfd. The solution I've come up with, that also avoids exposing irq_source_ids to userspace, is to work through the irqfd. If we setup a level irqfd, we can optionally associate an eoifd with the same irq_source_id, by passing the irqfd. To do this, we just need to create a new reference counted object for the source ID so we don't run into problems ordering release. This means we end up with a KVM_EOIFD ioctl that has both general usefulness and can still tie into an irqfd. In patch 6/6 I also include an alternate de-assert mechanism via an irqfd with the opposite polarity. I don't currently use this, but it's pretty trivial and at least available in archives now. I don't address whether injecting an edge irqfd really needs an assert followed by de-assert (I don't know). This new interface really unties itself from caring. We might be able to consolidate inject functions at some future point, but it doesn't change how we'd name flags as it did in the previous version. Thanks, Alex --- Alex Williamson (6): kvm: Level IRQ de-assert for KVM_IRQFD kvm: KVM_EOIFD, an eventfd for EOIs kvm: Extend irqfd to support level interrupts kvm: Sanitize KVM_IRQFD flags kvm: Add missing KVM_IRQFD API documentation kvm: Pass kvm_irqfd to functions Documentation/virtual/kvm/api.txt | 53 ++++++ arch/x86/kvm/x86.c | 2 include/linux/kvm.h | 23 +++ include/linux/kvm_host.h | 17 ++ virt/kvm/eventfd.c | 323 ++++++++++++++++++++++++++++++++++++- virt/kvm/kvm_main.c | 13 + 6 files changed, 414 insertions(+), 17 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html