Commit eeb89e2bb1ac ("x86/efi: Load fixmap GDT in efi_call_phys_epilog()")
moved loading the fixmap in efi_call_phys_epilog() after load_cr3()
since it was assumed to be more logical.
Turns out this is incorrect: In efi_call_phys_prolog(), we load the gdt
with its physical address, and when we rel
From: Joerg Roedel
When PTI is enabled on x86-32 the kernel uses the GDT mapped
in the fixmap for the simple reason that this address is
also mapped for user-space.
The efi_call_phys_prolog()/efi_call_phys_epilog() wrappers
change the GDT to call EFI runtime services and switch back
to the kerne
