Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 13 Dec 2021 14:25:39 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH RESEND v2 0/5] Avoid requesting page from DMA zone when no managed pages |
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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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