On Tue, Dec 07, 2021 at 11:16:31AM +0800, Baoquan He wrote:
> > This low 1M lock down is needed because AMD SME encrypts memory making
> > the old backup region mechanims impossible when switching into kdump
> > kernel. And Intel engineer mentioned their TDX (Trusted domain extensions)
> > which is under development in kernel also needs lock down the low 1M.
> > So we can't simply revert above commits to fix the page allocation
> > failure from DMA zone as someone suggested.
Did you read
f1d4d47c5851 ("x86/setup: Always reserve the first 1M of RAM")
carefully for a more generically important reason as to why the first 1M
should not be used?
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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