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What: /sys/devices/virtual/misc/tdx_guest/measurements/MRNAME[:HASH]
Date: April, 2025
KernelVersion: v6.16
Contact: linux-coco@lists.linux.dev
Description:
Value of a TDX measurement register (MR). MRNAME and HASH above
are placeholders. The optional suffix :HASH is used for MRs
that have associated hash algorithms. See below for a complete
list of TDX MRs exposed via sysfs. Refer to Intel TDX Module
ABI Specification for the definition of TDREPORT and the full
list of TDX measurements.
Intel TDX Module ABI Specification can be found at:
https://www.intel.com/content/www/us/en/developer/tools/trust-domain-extensions/documentation.html#architecture
See also:
https://docs.kernel.org/driver-api/coco/measurement-registers.html
What: /sys/devices/virtual/misc/tdx_guest/measurements/mrconfigid
Date: April, 2025
KernelVersion: v6.16
Contact: linux-coco@lists.linux.dev
Description:
(RO) MRCONFIGID - 48-byte immutable storage typically used for
software-defined ID for non-owner-defined configuration of the
guest TD – e.g., run-time or OS configuration.
What: /sys/devices/virtual/misc/tdx_guest/measurements/mrowner
Date: April, 2025
KernelVersion: v6.16
Contact: linux-coco@lists.linux.dev
Description:
(RO) MROWNER - 48-byte immutable storage typically used for
software-defined ID for the guest TD’s owner.
What: /sys/devices/virtual/misc/tdx_guest/measurements/mrownerconfig
Date: April, 2025
KernelVersion: v6.16
Contact: linux-coco@lists.linux.dev
Description:
(RO) MROWNERCONFIG - 48-byte immutable storage typically used
for software-defined ID for owner-defined configuration of the
guest TD – e.g., specific to the workload rather than the
run-time or OS.
What: /sys/devices/virtual/misc/tdx_guest/measurements/mrtd:sha384
Date: April, 2025
KernelVersion: v6.16
Contact: linux-coco@lists.linux.dev
Description:
(RO) MRTD - Measurement of the initial contents of the TD.
What: /sys/devices/virtual/misc/tdx_guest/measurements/rtmr[0123]:sha384
Date: April, 2025
KernelVersion: v6.16
Contact: linux-coco@lists.linux.dev
Description:
(RW) RTMR[0123] - 4 Run-Time extendable Measurement Registers.
Read from any of these returns the current value of the
corresponding RTMR. Write extends the written buffer to the
RTMR. All writes must start at offset 0 and be 48 bytes in
size. Partial writes will result in EINVAL returned by the
write() syscall.
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