Improved Retpoline Code In The Linux 5.16 Kernel

phoronix

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Improved Retpoline Code In The Linux 5.16 Kernel

10 November 2021, 05:50 AM

Phoronix: Improved Retpoline Code In The Linux 5.16 Kernel

Merged last week into the Linux 5.16 kernel is improved Retpoline "return trampoline" code...

Improved Retpoline Code In The Linux 5.16 Kernel - Phoronix

https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.16-Improves-Retpolines

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Developer12

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10 November 2021, 03:33 PM

I'd love it if someone upstreamed the spectre v2 mitigation for AMD K10 CPUs that pokes the Indirect Branch Predictor chicken bit and disables it (normally used during boot for cache-as-ram).

It's implemented in both NetBSD and the RHEL kernels, but was never upstreamed. With RHEL9 dropping support for K10 (and other CPU microarchitectures below feature-level 2) it would be nice for it to land in the mainline kernel so I could move the machine to a different distro when the time comes.
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