Re: [PATCH v2 1/2] x86/cpu: Disable CR pinning during CPU bringup

[Nikunj A. Dadhania]

On 3/17/2026 3:13 AM, Dave Hansen wrote: 
> Either we change how alternatives patching works, we use some other
> exception code, or we try and get CR4.FSGSBASE established as early as
> possible on the secondaries.

Right, I moved FSGSBASE enablement to cpu_init_exception_handling() to 
establish it early:

https://lore.kernel.org/all/1439b4f4-ff0c-4b6a-ac86-5c0da2d26cf5@xxxxxxx

This:
1) Enables FSGSBASE early for secondary CPUs before any exceptions occur
2) Consolidates initialization for both boot and secondary CPUs in one place
3) Eliminates the double-enable issue as in cr4_init()/identify_cpu()

Does this approach look good to you?

Regards,
Nikunj