linux-kernel - Re: [RFC PATCH v2 1/4] tsm: Runtime measurement register support

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Message-Id: <CYU2Z635C7SX.U9BMOKPM1G73@suppilovahvero>
Date: Fri, 02 Feb 2024 00:03:49 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Samuel Ortiz" <sameo@...osinc.com>, "Dan Williams"
 <dan.j.williams@...el.com>
Cc: "Kuppuswamy Sathyanarayanan"
 <sathyanarayanan.kuppuswamy@...ux.intel.com>, "Qinkun Bao"
 <qinkun@...gle.com>, "Yao, Jiewen" <jiewen.yao@...el.com>, "Xing, Cedric"
 <cedric.xing@...el.com>, "Dionna Amalie Glaze" <dionnaglaze@...gle.com>,
 <biao.lu@...el.com>, <linux-coco@...ts.linux.dev>,
 <linux-integrity@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 1/4] tsm: Runtime measurement register support

On Sun Jan 28, 2024 at 11:25 PM EET, Samuel Ortiz wrote:
> Some confidential computing architecture (Intel TDX, ARM-CCA, RISC-V
> CoVE) provide the TVM (confidential computing guest) with a set of
> runtime measurement registers (RTMR). TVMs can extend those registers
> with their measurements at runtime, i.e. after the TVM initial
> measurements are finalized and the TVM actually runs.
>
> RTMRs are separated from the initial measurement registers set, and TSMs

"measurement registers" and you do not need to cross-check what the
heck RTMR was anyway.

BR, Jarkko