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SubjectRe: [PATCH v7 9/10] KVM: arm64: docs: document KVM support of pointer authentication
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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@arm.com>
>>> Cc: Mark Rutland <mark.rutland@arm.com>
>>> Cc: Christoffer Dall <christoffer.dall@arm.com>
>>> Cc: Marc Zyngier <marc.zyngier@arm.com>
>>> Cc: kvmarm@lists.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
>

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