Re: [PATCH v2 3/3] virt: arm-cca-guest: Add support for measurement registers

[Kohei Enju]

Hi Yeoreum, Suzuki

On 09/30 12:24, Kohei Enju wrote:
> Hi Yeoreum, Sami,
> 
> On 09/29 17:57, Yeoreum Yun wrote:
> > From: Sami Mujawar <sami.mujawar@xxxxxxx>
> > 
> > Add support for Arm CCA measurement registers (MRs), enabling attestation
> > and runtime integrity tracking from guest Realms.
> > 
> > This implementation registers a measurement configuration with the TSM
> > framework and exposes measurement register values via sysfs using a
> > misc device. The supported registers include the Realm Initial
> > Measurement (RIM) and four Runtime Extensible Measurement Registers
> > (REM0–REM3), each using SHA-256 or SHA-512 depending on Realm
> 
> Is SHA-384 intentionally out of scope for this series?
> 
> Although TF-RMM does not support it yet, the RMM specification defines
> RSI_HASH_SHA_384. A platform using a custom RMM implementation could
> therefore launch a Realm configured to use SHA-384. I think the Realm
> guest driver should support it rather than fail initialization.

Separately from this driver implementation, I noticed that "B5.4.9.3
Success conditions" in the RMM specification 2.0-bet3 lacks a success
condition for sha_384.

Could you please report this to the specification team, or let me know
the appropriate contact for reporting specification issues?

Thanks,
Kohei