On 27.03.2010, at 16:43, Pekka Enberg wrote: > Hi Avi, > > I'm continuing my journey through the KVM API documentation and I'm now > scratching my head on how interrupts, traps, and exceptions are supported by > the API. I see KVM_CREATE_IRQCHIP and KVM_IRQ_LINE but I'm unable to work out > how the host is notified of such events. For example, if the guest does > > int $0x10
IRQs here mean hardware interrupts. They usually are pushed from host -> guest. So all you need is a way to tell the guest "you got an interrupt". Your userspace is the one giving interrupts, so there's no need to an exit. The "int $0x10" instruction describes a software interrupt. These are handled 100% in guest space. > is there some KVM_EXIT "exit reason" like we have for IO? Is there some other > mechanism for that? As I haven't yet set up anything related to IRQs I can > see the host just deadlock on user interrupts. I don't think I quite understand? If there's anything running inside guest context the host shouldn't be affected at all. Host interrupts always intercept guest execution. Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
