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Date: Wed, 12 Feb 2020 09:30:49 -0800
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Will Deacon <will@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>, James Morse <james.morse@....com>,
Catalin Marinas <catalin.marinas@....com>, Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Dave Martin <Dave.Martin@....com>, Kees Cook <keescook@...omium.org>,
Laura Abbott <labbott@...hat.com>, Marc Zyngier <maz@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>, Jann Horn <jannh@...gle.com>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
clang-built-linux <clang-built-linux@...glegroups.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 09/11] arm64: disable SCS for hypervisor code
On Tue, Feb 11, 2020 at 1:54 AM Will Deacon <will@...nel.org> 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
version.
Sami
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