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

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Date:   Wed, 27 Mar 2019 17:19:28 +0530
From:   Amit Daniel Kachhap <amit.kachhap@....com>
To:     Dave Martin <Dave.Martin@....com>,
        Kristina Martsenko <kristina.martsenko@....com>
Cc:     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

Hi,

On 3/27/19 4:14 PM, Dave Martin wrote:
> 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?
Currently there is discrepancy that userspace supports ptrauth in both 
nVHE/VHE mode and KVM guest only in VHE mode. I suppose adding explicit 
dependency flag here makes both of them similar.

Thanks,
Amit D
> 
> For SVE, I have
> 
> config ARM64_SVE
> 	depends on !KVM || ARM64_VHE
> 
> to implement this.
> 
> Cheers
> ---Dave
>