On Thu, Mar 13, 2014 at 11:53:04AM +0100, Paolo Bonzini wrote: > Instead of this, I'm adding the following to the KVM_IRQ_LINE ioctl: > > +On real hardware, interrupt pins can be active-low or active-high. This > +does not matter for the level field of struct kvm_irq_level: 1 always > +means active (asserted), 0 means inactive (deasserted). > + > +x86 allows the operating system to program the interrupt polarity > +(active-low/active-high) for level-triggered interrupts, and KVM used > +to consider the polarity. However, due to bitrot in the handling of > +active-low interrupts, the above convention is now valid on x86 too. > +This is signaled by KVM_CAP_X86_IOAPIC_POLARITY_IGNORED. Userspace > +should not present interrupts to the guest as active-low unless this > +capability is present (or unless it is not using the in-kernel irqchip, > +of course). > > and applying the patch to kvm/queue. Sounds great to me, thanks ! --Gabriel -- 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
