linux-kernel - Re: [PATCHv3 11/11] arm64: docs: document pointer authentication

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Message-ID: <86h8o3r5jy.wl-marc.zyngier@arm.com>
Date:   Sun, 22 Apr 2018 09:47:29 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Pavel Machek <pavel@....cz>
Cc:     Mark Rutland <mark.rutland@....com>,
        <linux-arm-kernel@...ts.infradead.org>, <arnd@...db.de>,
        <catalin.marinas@....com>, <cdall@...nel.org>,
        <drjones@...hat.com>, <kvmarm@...ts.cs.columbia.edu>,
        <linux-arch@...r.kernel.org>, <ramana.radhakrishnan@....com>,
        <suzuki.poulose@....com>, <will.deacon@....com>,
        <linux-kernel@...r.kernel.org>, <awallis@...eaurora.org>,
        <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCHv3 11/11] arm64: docs: document pointer authentication

On Sun, 22 Apr 2018 09:05:21 +0100,
Pavel Machek wrote:
> 
> Hi!
> 
> > @@ -205,6 +205,14 @@ Before jumping into the kernel, the following conditions must be met:
> >      ICC_SRE_EL2.SRE (bit 0) must be initialised to 0b0.
> >    - The DT or ACPI tables must describe a GICv2 interrupt controller.
> >  
> > +  For CPUs with pointer authentication functionality:
> > +  - If EL3 is present:
> > +    SCR_EL3.APK (bit 16) must be initialised to 0b1
> > +    SCR_EL3.API (bit 17) must be initialised to 0b1
> > +  - If the kernel is entered at EL1:
> > +    HCR_EL2.APK (bit 40) must be initialised to 0b1
> > +    HCR_EL2.API (bit 41) must be initialised to 0b1
> > +
> 
> 0b1 is quite confusing way to write 1.

Do you find 0x1 equally confusing?

0bx is a pretty common way of describing bit-fields of a hardware
register. It is also consistent with the rest of this document.

	M.

-- 
Jazz is not dead, it just smell funny.