Currently, V8 implements security mitigations like poisoning and array index masking to help protect against security vulnerability like Spectre. These mitigations are governed by a build-time flag untrusted-code-mitigations and can cause performance regression for some computational-heavy workloads.

Since these vulnerability may have been fixed on some latest CPUs, and ChomeOS image is built per platforms, I was wondering if we can turn off untrusted-code-mitigations when building ChromeOS for platforms with fixed CPUs.