On Sun, 2012-08-05 at 11:55 +0300, Avi Kivity wrote: > > I'm afraid I no longer know the details so closely, the code has > changed > quite a lot. But the self-signal happens in kvm_cpu_exec(), see also > env->exit_request.
Right, I think I eventually grasped it :-) It is fairly fragile however, it basically relies that none of those things that leave the kernel in an "incomplete" state (hcalls, mmio emulation, ...) return a non-zero value, but instead only ever request an exit via exit_request, so that we are guaranteed that the exec loop -will- go back, send that signal and finally exit as a result of EINTR. It also requires that the kernel tests & handles all those "completion" early in VCPU_RUN before it does anything else really including testing for signals. The latter seems fine for us, the former was what we got wrong on ppc: our hypercalls always cause exits via a non-zero return value for some reason (I didn't write that code, not sure exactly why it was written like that). Working on fixing that on qemu side now. Thanks ! Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
