On 05.06.2011, at 18:28, Avi Kivity wrote: > On 06/05/2011 07:25 PM, Christoffer Dall wrote: >>>> >>>> An additional advantage is that this is a vm ioctl, not a vcpu ioctl, so >>>> no need to interrupt the vcpu thread in userspace in order to queue an >>>> interrupt. Of course, it still happens in the kernel, but it's easier >>>> for userspace to implement its device model this way. >>> >>> So supporting this over existing archs would have some benefits as well, >>> though a bit smaller if in-kernel irqchip is already implemented. >>> >> >> Could you elaborate what you mean here? I'm not really following. Are >> you suggesting a new arch-generic interface? (Pardon my ignorance). > > Using KVM_IRQ_LINE everywhere except s390, not just in x86 and ARM. An in-kernel MPIC implementation is coming for PPC, so I don't see any reason to switch from something that works now. Alex
