linux-kernel - Re: [PATCH 13/18] arm64: preserve x18 when CPU is suspended

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Message-ID: <20191022154708.GA699@lakrids.cambridge.arm.com>
Date:   Tue, 22 Oct 2019 16:47:08 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Nick Desaulniers <ndesaulniers@...gle.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 13/18] arm64: preserve x18 when CPU is suspended

On Mon, Oct 21, 2019 at 03:43:14PM -0700, Sami Tolvanen wrote:
> On Mon, Oct 21, 2019 at 9:56 AM Mark Rutland <mark.rutland@....com> wrote:
> > This should have a corresponding change to cpu_suspend_ctx in
> > <asm/suspend.h>. Otherwise we're corrupting a portion of the stack.
> 
> Ugh, correct. I'll fix this in the next version. Thanks.

It's probably worth extending the comment above cpu_do_suspend to say:

| This must be kept in sync with struct cpu_suspend_ctx in
| <asm/suspend.h>

... to match what we have above struct cpu_suspend_ctx, and make this
more obvious in future.

Thanks,
Mark.