linux-kernel - [RFC PATCH v1 0/4] tsm: Runtime measurement registers ABI

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Message-ID: <20240114223532.290550-1-sameo@rivosinc.com>
Date: Sun, 14 Jan 2024 23:35:26 +0100
From: Samuel Ortiz <sameo@...osinc.com>
To: Dan Williams <dan.j.williams@...el.com>
Cc: linux-coco@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 0/4] tsm: Runtime measurement registers ABI

Some confidential computing architectures (Intel TDX, ARM CCA, RISC-V
CoVE) provide their guests with a set of measurements registers that can
be extended at runtime, i.e. after the initial, host-initiated
measurements of the TVM are finalized. Those runtime measurement
registers (RTMR) are isolated from the host accessible ones but TSMs
include them in their signed attestation reports.

All architectures supporting RTMRs expose a similar interface to their
TVMs: An extension command/call that takes a measurement value and an
RTMR index to extend it with, and a readback command for reading an RTMR
value back (taking an RTMR index as an argument as well). This patch series
builds an architecture agnostic, configfs-based ABI for userspace to extend
and read RTMR values back. It extends the current TSM ops structure and
each confidential computing architecture can implement this extension to
provide RTMR support.

---
Samuel Ortiz (4):
  tsm: Runtime measurement register support
  tsm: Add RTMRs to the configfs-tsm hierarchy
  tsm: Allow for mapping RTMRs to TCG TPM PCRs
  tsm: Allow for extending and reading configured RTMRs

 drivers/virt/coco/Kconfig |   1 +
 drivers/virt/coco/tsm.c   | 362 ++++++++++++++++++++++++++++++++++++++
 include/linux/tsm.h       |  28 ++-
 3 files changed, 390 insertions(+), 1 deletion(-)

-- 
2.42.0