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

Jason Gunthorpe
2026-04-14T13:35:29Z

On Tue, Apr 14, 2026 at 02:26:58PM +0100, Suzuki K Poulose wrote:
> On 14/04/2026 13:29, Jason Gunthorpe wrote:
> > On Tue, Apr 14, 2026 at 11:10:51AM +0100, Suzuki K Poulose wrote:
> >
> > > > Isn't this also sort of incomplete? Doesn't anything serious need
> > > > signed measurements? Isnt't there alot more data that comes out of RMM
> > > > than just a few measurement registers?
> > > As mentioned above, this series adds the support for Runtime Extendible
> > > Measurements (REM in CCA, RTMR on TDX). The RIM+Platform Attestation is
> > > already provided via the TSM_REPORT
> >
> > Okay, but what actual use is this?
> >
>
> Good point. This REMs are planned to be used for EFI_CC_MEASUREMENT_PROTOCOL
> as described below:
>
> https://github.com/tianocore/edk2/issues/11383

So this is tying it to the same FW event log that TPM uses.

I think that strengthens my point this should all be uninform. TPM
drivers are directly exposing the event log today, but I guess that
needs generalization if non-TPM drivers are going to present it as
well.

How do you imagine getting and manipulating the EFI event log to use
with this?

Jason