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kernel: enable core scheduling on 5.14+ kernels

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Core scheduling is a recent innovation in newer kernels to help run
certain untrusted compute workloads more safely in the face of
vulnerabilities like Spectre. In short: it lets processes assign a
unique "cookie" to some group of processes to indicate they are allowed
to be scheduled together on the same SMT-capable core. This helps
mitigate attacks that rely on observing usage of CPU execution units by
cohabitated threads.

Some extra details are available via Linux Weekly News:

  "Core scheduling lands in 5.14", https://lwn.net/Articles/861251/

Signed-off-by: Austin Seipp <aseipp@pobox.com>
This commit is contained in:
Austin Seipp 2021-11-13 00:29:51 -06:00
parent 7e7e16cc38
commit 3df74bdd3f
1 changed files with 2 additions and 0 deletions
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pkgs/os-specific/linux/kernel/common-config.nix
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@ -859,6 +859,8 @@ let
LIRC = mkMerge [ (whenOlder "4.16" module) (whenAtLeast "4.17" yes) ];
SCHED_CORE = whenAtLeast "5.14" yes;
} // optionalAttrs (stdenv.hostPlatform.system == "x86_64-linux" || stdenv.hostPlatform.system == "aarch64-linux") {
# Enable CPU/memory hotplug support
# Allows you to dynamically add & remove CPUs/memory to a VM client running NixOS without requiring a reboot