Re: EFI memory map

To: Emmanuel Dreyfus <manu%netbsd.org@localhost>, tech-kern%netbsd.org@localhost
Subject: Re: EFI memory map
From: Maxime Villard <max%m00nbsd.net@localhost>
Date: Sat, 4 Jan 2020 08:46:06 +0100

Le 02/01/2020 à 16:55, Emmanuel Dreyfus a écrit :

And indeed, studying the crash in ddb shows it happens when
accessing a physical address that is excluded by x86_fake_clusters()
but included by EFI memory map.


Note that x86_fake_clusters() is unsafe. It does not exclude the MMIO
pages, because only the bios can tell where they are. These pages can
get returned by uvm_pagealloc, triggering all sorts of crazy behavior,
potentially physically nuking the machine.

I think we should remove this function.

Maxime

References:
- EFI memory map
  - From: Emmanuel Dreyfus

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