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Date: Mon, 4 Nov 2019 13:38:30 -0800
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Marc Zyngier <maz@...nel.org>
Cc: Will Deacon <will@...nel.org>, 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>,
Mark Rutland <mark.rutland@....com>, 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 v4 13/17] arm64: preserve x18 when CPU is suspended
On Mon, Nov 4, 2019 at 5:20 AM Marc Zyngier <maz@...nel.org> wrote:
> > ENTRY(cpu_do_suspend)
> > mrs x2, tpidr_el0
> > @@ -73,6 +75,9 @@ alternative_endif
> > stp x8, x9, [x0, #48]
> > stp x10, x11, [x0, #64]
> > stp x12, x13, [x0, #80]
> > +#ifdef CONFIG_SHADOW_CALL_STACK
> > + str x18, [x0, #96]
> > +#endif
>
> Do we need the #ifdefery here? We didn't add that to the KVM path,
> and I'd feel better having a single behaviour, specially when
> NR_CTX_REGS is unconditionally sized to hold 13 regs.
I'm fine with dropping the ifdefs here in v5 unless someone objects to this.
Sami
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