linux-kernel - [RFC PATCH v1 0/3] Export TDX module information via SYSFS

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Message-ID: <cover.1741952958.git.legion@kernel.org>
Date: Fri, 14 Mar 2025 12:56:25 +0100
From: Alexey Gladkov <legion@...nel.org>
To: x86@...nel.org
Cc: "Alexey Gladkov (Intel)" <legion@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-coco@...ts.linux.dev,
	Alexey Gladkov <alexey.gladkov@...el.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Joerg Roedel <jroedel@...e.de>,
	Juergen Gross <jgross@...e.com>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Larry.Dewey@....com,
	Nikunj A Dadhania <nikunj@....com>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: [RFC PATCH v1 0/3] Export TDX module information via SYSFS

From: "Alexey Gladkov (Intel)" <legion@...nel.org>

TD-Preserving updates depend on a userspace tool to select the appropriate
module to load. To facilitate this decision-making process, expose the
necessary information to userspace.

Also TDX module information (version, supported features, etc) is crucial for
bug reporting. For this purpose, it makes sense to have a consistent structure
for host and guest information in sysfs.

As already discussed [1] in the mailing list for tdx used the directory
/sys/hypervisor/tdx.

[1] https://lore.kernel.org/lkml/20250311110748.GCZ9AZhPYYAz-MXErv@fat_crate.local/


Alexey Gladkov (Intel) (3):
  x86/tdx: Make TDX metadata available via SYSFS
  x86/tdx: Make TDX metadata available on guest via SYSFS
  docs: ABI: testing: Add documentation about TDX

 .../ABI/testing/sysfs-hypervisor-tdx          | 50 ++++++++++
 arch/x86/Kconfig                              |  2 +
 arch/x86/coco/tdx/tdx.c                       | 92 +++++++++++++++++++
 arch/x86/include/asm/shared/tdx.h             |  2 +
 arch/x86/include/asm/tdx.h                    | 12 +++
 arch/x86/virt/vmx/tdx/tdx.c                   | 74 +++++++++++++++
 6 files changed, 232 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-hypervisor-tdx

-- 
2.48.1