Message-ID: <20241210143423.101774-1-sgarzare@redhat.com>
Date: Tue, 10 Dec 2024 15:34:20 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: linux-coco@...ts.linux.dev
Cc: Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Peter Huewe <peterhuewe@....de>,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-integrity@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	x86@...nel.org,
	Joerg Roedel <jroedel@...e.de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Claudio Carvalho <cclaudio@...ux.ibm.com>,
	Dov Murik <dovmurik@...ux.ibm.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Stefano Garzarella <sgarzare@...hat.com>
Subject: [PATCH 0/3] Enlightened vTPM support for SVSM on SEV-SNP

This series is based on the RFC sent by James last year [1].
In the meantime, the patches have been maintained and tested in the
Coconut Linux fork [2] along with the work to support the vTPM
emulation in Coconut SVSM.

The main changes Claudio and I made from the RFC are the following:
- Used SVSM_VTPM_QUERY to probe the TPM as Tom Lendacky suggested
- Changed references/links to TCG TPM repo since in the last year MS
  donated the reference TPM implementation to the TCG.
- Addressed Dov Murik's comments:
  https://lore.kernel.org/all/f7d0bd07-ba1b-894e-5e39-15fb1817bc8b@linux.ibm.com/
- Added a new patch with SVSM call macros for the vTPM protocol, following
  what we already have for SVSM_CORE and SVSM_ATTEST
- Rebased on v6.13-rc2

Since all sev-snp dependencies are now upstream, this series can be
applied directly to the Linus' tree.

The first patch is primarily designed to support an enlightened driver
for the AMD svsm based vTPM, but it could be used by any platform which
communicates with a TPM device.
The second and third patches, on the other hand, are specific to AMD SVSM.
They use SVSM_VTPM_QUERY call to probe for the vTPM device and
SVSM_VTPM_CMD call to execute vTPM operations as defined in the
"Secure VM Service Module for SEV-SNP Guests" [3] Publication # 58019
Revision: 1.00

These patches were tested in an AMD SEV-SNP guest running:
- a recent version of Coconut SVSM [4] containing an ephemeral vTPM
- a PoC [5] containing a stateful vTPM used for sealing/unsealing a LUKS key

Thanks,
Stefano

[1] https://lore.kernel.org/all/acb06bc7f329dfee21afa1b2ff080fe29b799021.camel@linux.ibm.com/
[2] https://github.com/coconut-svsm/linux/tree/svsm
[3] https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/58019.pdf
[4] https://github.com/coconut-svsm/svsm/commit/6522c67e1e414f192a6f014b122ca8a1066e3bf5
[5] https://github.com/stefano-garzarella/snp-svsm-vtpm

James Bottomley (2):
  tpm: add generic platform device
  x86/sev: add a SVSM vTPM platform device

Stefano Garzarella (1):
  x86/sev: add SVSM call macros for the vTPM protocol

 arch/x86/include/asm/sev.h      |   4 +
 include/linux/tpm_platform.h    |  90 ++++++++++++++++++++
 arch/x86/coco/sev/core.c        |  64 +++++++++++++++
 drivers/char/tpm/tpm_platform.c | 141 ++++++++++++++++++++++++++++++++
 drivers/char/tpm/Kconfig        |   7 ++
 drivers/char/tpm/Makefile       |   1 +
 6 files changed, 307 insertions(+)
 create mode 100644 include/linux/tpm_platform.h
 create mode 100644 drivers/char/tpm/tpm_platform.c


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2.47.1

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