| 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. |
