linux-kernel - Re: [PATCH v8 06/43] arm64: RME: Define the user ABI

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Message-ID: <9efc4db0-4264-4e8f-881e-2656c22a8b3e@arm.com>
Date: Thu, 1 May 2025 14:47:04 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>, Zenghui Yu <yuzenghui@...wei.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Joey Gouly <joey.gouly@....com>, Alexandru Elisei
 <alexandru.elisei@....com>, Christoffer Dall <christoffer.dall@....com>,
 Fuad Tabba <tabba@...gle.com>, linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 Gavin Shan <gshan@...hat.com>, Shanker Donthineni <sdonthineni@...dia.com>,
 Alper Gun <alpergun@...gle.com>, "Aneesh Kumar K . V"
 <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v8 06/43] arm64: RME: Define the user ABI

On 01/05/2025 14:31, Steven Price wrote:
> On 28/04/2025 09:58, Suzuki K Poulose wrote:
>> Hi Steven
>>
>> On 16/04/2025 14:41, Steven Price wrote:
>>> There is one (multiplexed) CAP which can be used to create, populate and
>>> then activate the realm.
>>>
>>> Co-developed-by: Suzuki K Poulose <suzuki.poulose@....com>
>>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>>> Signed-off-by: Steven Price <steven.price@....com>
>>> ---
>>> Changes since v7:
>>>    * Add documentation of new ioctls
>>>    * Bump the magic numbers to avoid conflicts
>>> Changes since v6:
>>>    * Rename some of the symbols to make their usage clearer and avoid
>>>      repetition.
>>> Changes from v5:
>>>    * Actually expose the new VCPU capability (KVM_ARM_VCPU_REC) by bumping
>>>      KVM_VCPU_MAX_FEATURES - note this also exposes KVM_ARM_VCPU_HAS_EL2!
>>> ---
>>>    Documentation/virt/kvm/api.rst    | 70 +++++++++++++++++++++++++++++++

>>
>> May be rephrase it to:
>>
>> No changes can be made to Realm's memory (including the IPA state). No
>> new VCPUs can be created after this step.
> 
> I was attmepting to include that CONFIG_REALM cannot be called. How about:
> 
> 	Request the RMM to activate the realm. No
> 	changes can be made to the Realm's memory,
> 	IPA state or configuration parameters.  No
> 	new VCPUs can be created after this step.

Looks good to me, cheers

Suzuki