On 07/01/2020 19.05, BALATON Zoltan wrote: > On Tue, 7 Jan 2020, Greg Kurz wrote: >> On Tue, 7 Jan 2020 18:32:15 +0100 >> Greg Kurz <gr...@kaod.org> wrote: >> >>> On Tue, 7 Jan 2020 15:48:19 +1100 >>> David Gibson <da...@gibson.dropbear.id.au> wrote: >>> >>>> The PowerPC 970 CPU was a cut-down POWER4, which had hypervisor >>>> capability. >>>> However, it can be (and often was) strapped into "Apple mode", where >>>> the >>>> hypervisor capabilities were disabled (essentially putting it always in >>>> hypervisor mode). >> >> Isn't it supervisor mode instead of hypervisor mode ? > > By the way, do you know if this strapping is hardware or software based? > So is it the firmware that disables it on Apple hardware or is it some > CPU pin connected somewhere on the motherboard or it's within the CPU > and cannot be changed? I wonder if it's theoretically possible to > re-enable it on an Apple G5 or we would likely never see a PowerPC 970 > with HV enabled?
I don't know how Apple disabled it, but you can buy a used Terrasoft YDL PowerStation if you want to see it in action. Thomas
