On: AMD Zen 2 Microarchitecture Analysis: Ryzen 3000 and EPYC Rome

[masklinn]

What do you mean by "run completely bare with regards to microcode patches", that they don't apply microcode patches & errata?

[baybal2 → masklinn]

Yes, that they did not bring up microcode patches that cover some of Spectre/Meltdown family bugs

[zeroname → baybal2]

Do you have a source for that?

[dijit → zeroname]

GCP was "fully fixed before it was known" according to the engineers I know there. I find it /highly/ unlikely that they don't have patched microcode.

I mean, the cloud business is the place with the most to lose from these kinds of issues, I am incredibly suspicious of the claim that cloud providers aren't patching their microcode.

Whether it's intels or their own modified variant of microcode I would fully expect them to be patched in some way.

[caspper69 → dijit]

Google's researchers played a big part in discovering / classifying / mitigating the vulnerabilities. They also developed the retpoline pattern. It is very likely that GCP was "fixed before it was known."

[rat9988 → caspper69]

Indeed, this is why it's unlikely that hey have the patched microcode.

[dijit → rat9988]

How do you figure that?

They have much to lose from not applying these mitigations, especially if they're the people spending a fortune to find them.

[y4mi → dijit]

If the grand-parents claim holds, they wouldn't have needed it because they already implemented a workaround themselves.

I honestly doubt that claim however and haven't heard it before this thread.