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Date: Wed, 12 Feb 2020 09:30:49 -0800
From: Sami Tolvanen <>
To: Will Deacon <>
Cc: Mark Rutland <>, James Morse <>, 
	Catalin Marinas <>, Steven Rostedt <>, 
	Masami Hiramatsu <>, Ard Biesheuvel <>, 
	Dave Martin <>, Kees Cook <>, 
	Laura Abbott <>, Marc Zyngier <>, 
	Nick Desaulniers <>, Jann Horn <>, 
	Miguel Ojeda <>, 
	Masahiro Yamada <>, 
	clang-built-linux <>, 
	Kernel Hardening <>, 
	linux-arm-kernel <>, LKML <>
Subject: Re: [PATCH v7 09/11] arm64: disable SCS for hypervisor code

On Tue, Feb 11, 2020 at 1:54 AM Will Deacon <> wrote:
> Thanks, I missed that. It's annoying that we'll end up needing /both/
> -ffixed-x18 *and* the save/restore around guest transitions, but if we
> actually want to use SCS for the VHE code then I see that it will be
> required.
> Sami -- can you restore -ffixed-x18 and then try the function attribute
> as suggested by James, please?

Sure. Adding __noscs to __hyp_text and not filtering out any of the
flags in the Makefile appears to work. I'll update this in the next


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