Re: [PATCH hyperv-next v3] arch/x86: Provide the CPU number in the wakeup AP callback

[Thomas Gleixner]

On Wed, Apr 30 2025 at 13:47, Roman Kisel wrote:
> When starting APs, confidential guests and paravisor guests
> need to know the CPU number, and the pattern of using the linear
> search has emerged in several places. With N processors that leads
> to the O(N^2) time complexity.
>
> Provide the CPU number in the AP wake up callback so that one can
> get the CPU number in constant time.
>
> Suggested-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
> Signed-off-by: Roman Kisel <romank@xxxxxxxxxxxxxxxxxxx>
> Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>

Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>