Re: [PATCH v2 0/2] x86: Fix kexec 5-level to 4-level paging transition

[Borislav Petkov]

On Tue, Oct 28, 2025 at 10:55:55AM +0000, Usama Arif wrote:
> This series addresses critical bugs in the kexec path when transitioning
> from a kernel using 5-level page tables to one using 4-level page tables.

Out of curiosity: what is the real-life use case for this?

Judging by the Reported-by's I guess Meta is doing some kexec-ing into default
kernels which are 4-level so that they can work on any machine ...

Close?

-- 
Regards/Gruss,
    Boris.

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