83 lines
3.1 KiB
Plaintext
83 lines
3.1 KiB
Plaintext
What: /sys/kernel/config/tsm/report/$name/inblob
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Date: September, 2023
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KernelVersion: v6.7
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Contact: linux-coco@lists.linux.dev
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Description:
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(WO) Up to 64 bytes of user specified binary data. For replay
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protection this should include a nonce, but the kernel does not
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place any restrictions on the content.
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What: /sys/kernel/config/tsm/report/$name/outblob
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Date: September, 2023
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KernelVersion: v6.7
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Contact: linux-coco@lists.linux.dev
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Description:
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(RO) Binary attestation report generated from @inblob and other
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options The format of the report is implementation specific
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where the implementation is conveyed via the @provider
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attribute.
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What: /sys/kernel/config/tsm/report/$name/auxblob
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Date: October, 2023
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KernelVersion: v6.7
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Contact: linux-coco@lists.linux.dev
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Description:
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(RO) Optional supplemental data that a TSM may emit, visibility
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of this attribute depends on TSM, and may be empty if no
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auxiliary data is available.
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When @provider is "sev_guest" this file contains the
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"cert_table" from SEV-ES Guest-Hypervisor Communication Block
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Standardization v2.03 Section 4.1.8.1 MSG_REPORT_REQ.
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https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/56421.pdf
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What: /sys/kernel/config/tsm/report/$name/provider
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Date: September, 2023
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KernelVersion: v6.7
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Contact: linux-coco@lists.linux.dev
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Description:
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(RO) A name for the format-specification of @outblob like
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"sev_guest" [1] or "tdx_guest" [2] in the near term, or a
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common standard format in the future.
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[1]: SEV Secure Nested Paging Firmware ABI Specification
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Revision 1.55 Table 22
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https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/56860.pdf
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[2]: Intel® Trust Domain Extensions Data Center Attestation
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Primitives : Quote Generation Library and Quote Verification
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Library Revision 0.8 Appendix 4,5
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https://download.01.org/intel-sgx/latest/dcap-latest/linux/docs/Intel_TDX_DCAP_Quoting_Library_API.pdf
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What: /sys/kernel/config/tsm/report/$name/generation
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Date: September, 2023
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KernelVersion: v6.7
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Contact: linux-coco@lists.linux.dev
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Description:
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(RO) The value in this attribute increments each time @inblob or
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any option is written. Userspace can detect conflicts by
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checking generation before writing to any attribute and making
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sure the number of writes matches expectations after reading
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@outblob, or it can prevent conflicts by creating a report
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instance per requesting context.
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What: /sys/kernel/config/tsm/report/$name/privlevel
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Date: September, 2023
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KernelVersion: v6.7
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Contact: linux-coco@lists.linux.dev
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Description:
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(WO) Attribute is visible if a TSM implementation provider
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supports the concept of attestation reports for TVMs running at
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different privilege levels, like SEV-SNP "VMPL", specify the
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privilege level via this attribute. The minimum acceptable
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value is conveyed via @privlevel_floor and the maximum
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acceptable value is TSM_PRIVLEVEL_MAX (3).
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What: /sys/kernel/config/tsm/report/$name/privlevel_floor
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Date: September, 2023
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KernelVersion: v6.7
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Contact: linux-coco@lists.linux.dev
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Description:
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(RO) Indicates the minimum permissible value that can be written
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to @privlevel.
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