Linux Landing XMM Register Rollback Workaround For AMD Zen 1 / Zen 2 CPUs

[phoronix]

Phoronix: Linux Landing XMM Register Rollback Workaround For AMD Zen 1 / Zen 2 CPUs

Sent in this morning via x86/urgent for integration into Linux 6.3 and also for back-porting to stable kernel series is disabling the XSAVES instruction for AMD Zen 1 and Zen 2 processors to workaround an AMD processor erratum made public last year...

https://www.phoronix.com/news/Linux-AMD-Erratum-1386

[rene]

Too bad Zen 3 CPUs are affected, too: https://www.youtube.com/watch?v=biDUsb_VRkk tested on Ryzen 5950x. And theoretically AMD has microcode updates they just don't publish for most models, ... :-/

[cripsy]

Aging Zen 2 processors? Are they really considered old already?

[kylew77]

Aging Zen 2 processors? Are they really considered old already?

Came here to say that, just bought a refurbished ThinkPad with an octo core Zen 2, best laptop I've ever had. Not everyone can afford the latest and greatest.

[caligula]

So is this the cause of random lockups with Ryzen (at least Zen 1)?

[andrei_me]

Not everyone can afford the latest and greatest.

Or they simply aren't available to buy, almost impossible to find a latest gen Ryzen laptop in Brazil

[kn00tcn]

Aging Zen 2 processors? Are they really considered old already?

the word aging came before "zen 1", but 2019 zen 2 cant be considered new if we're two generations and four years past that, they're aging because they have a specific set of errata and lack of mitigations, also everything is aging...