On 05.06.2011, at 18:33, Avi Kivity wrote: > On 06/05/2011 07:30 PM, Alexander Graf wrote: >> >> >> >> 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. > > Right, this is spilled milk. > > Does the ppc qemu implementation raise KVM_INTERRUPT solely from the vcpu thread? Well, without iothread it used to obviously. Now that we have an iothread, it calls ioctl(KVM_INTERRUPT) from a separate thread. The code also doesn't forcefully wake up the vcpu thread, so yes, I think here's a chance for at least delaying interrupt delivery. Chances are pretty slim we don't get out of the vcpu thread at all :). Alex
