linux-kernel - Re: [PATCH v7 9/10] KVM: arm64: docs: document KVM support of pointer authentication

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Message-ID: <20190327104428.GV3567@e103592.cambridge.arm.com>
Date:   Wed, 27 Mar 2019 10:44:29 +0000
From:   Dave Martin <Dave.Martin@....com>
To:     Kristina Martsenko <kristina.martsenko@....com>
Cc:     Amit Daniel Kachhap <amit.kachhap@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        kvmarm@...ts.cs.columbia.edu,
        Ramana Radhakrishnan <ramana.radhakrishnan@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 9/10] KVM: arm64: docs: document KVM support of
 pointer authentication

On Mon, Mar 25, 2019 at 08:05:49PM +0000, Kristina Martsenko wrote:
> On 19/03/2019 08:30, Amit Daniel Kachhap wrote:
> > This adds sections for KVM API extension for pointer authentication.
> > A brief description about usage of pointer authentication for KVM guests
> > is added in the arm64 documentations.
> > 
> > Signed-off-by: Amit Daniel Kachhap <amit.kachhap@....com>
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: Christoffer Dall <christoffer.dall@....com>
> > Cc: Marc Zyngier <marc.zyngier@....com>
> > Cc: kvmarm@...ts.cs.columbia.edu
> 
> I think it makes sense to also update the Kconfig symbol description for
> CONFIG_ARM64_PTR_AUTH, since it currently only mentions userspace
> support, but now the option also enables KVM guest support.
> 
> It's also worth mentioning that CONFIG_ARM64_VHE=y is required for guest
> support.

Is it worth making this dependency explicit in Kconfig?

For SVE, I have

config ARM64_SVE
	depends on !KVM || ARM64_VHE

to implement this.

Cheers
---Dave