linux-kernel - Re: [PATCH v2 16/17] arm64: disable SCS for hypervisor code

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Date:   Thu, 24 Oct 2019 21:42:59 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        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>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.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>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 16/17] arm64: disable SCS for hypervisor code

On Fri, 25 Oct 2019 10:29:47 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> On Fri, Oct 25, 2019 at 7:52 AM <samitolvanen@...gle.com> wrote:
> >
> > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> > ---
> >  arch/arm64/kvm/hyp/Makefile | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
> > index ea710f674cb6..8289ea086e5e 100644
> > --- a/arch/arm64/kvm/hyp/Makefile
> > +++ b/arch/arm64/kvm/hyp/Makefile
> > @@ -28,3 +28,6 @@ GCOV_PROFILE  := n
> >  KASAN_SANITIZE := n
> >  UBSAN_SANITIZE := n
> >  KCOV_INSTRUMENT        := n
> > +
> > +ORIG_CFLAGS := $(KBUILD_CFLAGS)
> > +KBUILD_CFLAGS = $(subst $(CC_FLAGS_SCS),,$(ORIG_CFLAGS))  
> 
> 
> $(subst ... ) is not the correct use here.
> 
> It works like sed,   s/$(CC_CFLAGS_SCS)//
> instead of matching by word.
> 
> 
> 
> 
> KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
> 
> is more correct, and simpler.

I guess that would work too. Not sure why I never used it. I see mips
used it for their -pg flags.

-- Steve