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Message-ID: <CA+1=6ydMVk4Vcouc2ag8G7tfqZy80VWFxWHSHEKF1JaABd=A7A@mail.gmail.com>
Date: Wed, 24 Apr 2024 15:06:04 +0200
From: Thomas Fossati <thomas.fossati@...aro.org>
To: Steven Price <steven.price@....com>
Cc: kvm@...r.kernel.org, kvmarm@...ts.linux.dev,
Sami Mujawar <sami.mujawar@....com>, 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>, Suzuki K Poulose <suzuki.poulose@....com>,
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>
Subject: Re: [PATCH v2 14/14] virt: arm-cca-guest: TSM_REPORT support for realms
Hi Steven, Sami,
On Fri, 12 Apr 2024 at 10:47, Steven Price <steven.price@....com> wrote:
> +/**
> + * arm_cca_report_new - Generate a new attestation token.
> + *
> + * @report: pointer to the TSM report context information.
> + * @data: pointer to the context specific data for this module.
> + *
> + * Initialise the attestation token generation using the challenge data
> + * passed in the TSM decriptor.
Here, it'd be good to document two interesting facts about challenge data:
1. It must be at least 32 bytes, and
2. If its size is less than 64 bytes, it will be zero-padded.
cheers!
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