Re: [PATCH 3/4] x86/fpu: Make the EFI FPU calling convention explicit

From: Borislav Petkov
Date: Mon Jan 18 2021 - 07:15:40 EST

On Sun, Jan 17, 2021 at 10:20:40PM -0800, Andy Lutomirski wrote:
> EFI uses kernel_fpu_begin() to conform to the UEFI calling convention.
> This specifically requires initializing FCW, whereas no sane 64-bit kernel
> code should use legacy 387 operations that reference FCW.
> Add KFPU_EFI to make this self-documenting, and use it in the EFI code.

I'd prefer if you slap a comment over the kernel_fpu_begin() calls in
efi instead of adding a separate define etc.