Re: [PATCH v2 0/3] arm64/virt: Add Arm CCA measurement register support

[Yeoreum Yun <yeoreum.yun@arm.com>]

On Tue, Sep 29, 2026 at 04:20:51PM -0300, Jason Gunthorpe wrote:
> On Tue, Sep 29, 2026 at 05:57:46PM +0100, Yeoreum Yun wrote:
> > This series adds support for Arm Confidential Compute Architecture (CCA)
> > measurement registers in the Linux kernel, enabling guest Realms to
> > access, extend, and expose measurement values for attestation and runtime
> > integrity tracking.
> 
> I'd prefer not to add any more tsm_measurements users until we bottom
> out on the attestation subsystem.. Mainly because it establishes uAPI
> that doesn't really do everything people need from this stuff..

Tend to agree. However, I think this seems like an integration with
the attestation subsystem.
IOW, although the functionality and interface are currently scattered,
the functionality of the TSM MR doesn't change —
showing the current measurement register status and generating
a token with a challenge. Therefore, even if the subsystem is refactored,
I don't think this would be a burden for it, and personally,
I'd like to see this patch series emancipated from almost six months of waiting ;)

> 
> The actual code seemed reasonble from a quick glance.

Thanks!

-- 
Sincerely,
Yeoreum Yun