[PATCH v2] x86/kexec: Add EFI config table identity mapping for kexec kernel

[Ard Biesheuvel]

On Wed, 2 Aug 2023 at 15:59, Borislav Petkov <bp at alien8.de> wrote:
>
> On Wed, Aug 02, 2023 at 08:40:36AM -0500, Tom Lendacky wrote:
> > Short of figuring out how to map page accesses earlier through the
> > boot_page_fault IDT routine
>
> And you want to do that because?
>

... because now, entering via startup_32 is broken, given that it only
maps the kernel image itself and relies on the #PF handling for
everything else it accesses, including firmware tables.

AFAICT this also means that entering via startup_32 is broken entirely
for any configuration that enables the cc blob config table check,
regardless of the platform.