Re: [PATCH] efi/x86: use naked RET on mixed mode call wrapper

On Tue, Jul 19, 2022 at 05:22:28PM +0200, Ard Biesheuvel wrote:

The code in question is a little trampoline that executes from the EFI mixed mode 1:1 mapping of the kernel text, and never via the kernel mapping, so we should just move it into .rodata instead (and fix up the mixed mode virtual address map logic accordingly). I don't think mapping the kernel text and rodata into the 1;1 EFI map is needed at all, tbh, and the only thing we ever access via that mapping is that little trampoline.

Something like

I'm obviously always for simplifications like that. I'm guessing this should be tested for a full next release before it goes to Linus?

Thx.