[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: "Meltdown" and "Spectre": Every modern processor has unfixable security flaws


tomas@tuxteam.de wrote:
> Does any of the processors in the M68K family support VM?

They did since the early 1980s when i wondered what the advantage of an
68010 would be over an 68000 (with HP BASIC: none).

After all, early Sun, HP and Apollo Unix workstations were based on 680X0.

> Does any of the M68K family members prefetch speculatively?

The last one (68060) had Branch Prediction, which implies some kind of
speculative execution and data prefetching.

Good news: Google claims to have a software remedy against Spectre,
called the "Retpoline". It keeps the CPU speculator busy with harmless
things while vulnerable commands are executed. I guess we will see it soon
as compiler option.
(I love the image of a hyperactive 7-year old child wrapped in a warehouse
 of trampolines.)

Man against hardware. Who will finally win ?

Have a nice day :)


Reply to: