Messages in this thread | | | Subject | [PATCH v2 0/5] tsm: Attestation Report ABI | From | Dan Williams <> | Date | Mon, 14 Aug 2023 00:43:09 -0700 |
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Changes since v1: - Switch from Keyring to sysfs (James)
An attestation report is signed evidence of how a Trusted Virtual Machine (TVM) was launched and its current state. A verifying party uses the report to make judgements of the confidentiality and integrity of that execution environment. Upon successful attestation the verifying party may, for example, proceed to deploy secrets to the TVM to carry out a workload. Multiple confidential computing platforms share this similar flow.
The approach of adding adding new char devs and new ioctls, for what amounts to the same logical functionality with minor formatting differences across vendors [1], is untenable. Common concepts and the community benefit from common infrastructure.
Use sysfs for this facility for maintainability compared to ioctl(). The expectation is that this interface is a boot time, configure once, get report, and done flow. I.e. not something that receives ongoing transactions at runtime. However, runtime retrieval is not precluded and a mechanism to detect potential configuration conflicts from multiple-threads using this interface is included.
The keyring@ list is dropped on this posting since a new key-type is no longer being pursued.
Link: http://lore.kernel.org/r/cover.1684048511.git.sathyanarayanan.kuppuswamy@linux.intel.com
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Dan Williams (5): virt: coco: Add a coco/Makefile and coco/Kconfig tsm: Introduce a shared ABI for attestation reports virt: sevguest: Prep for kernel internal {get,get_ext}_report() mm/slab: Add __free() support for kvfree virt: sevguest: Add TSM_REPORTS support for SNP_{GET,GET_EXT}_REPORT
Documentation/ABI/testing/sysfs-class-tsm | 47 +++++ MAINTAINERS | 8 + drivers/virt/Kconfig | 6 - drivers/virt/Makefile | 4 drivers/virt/coco/Kconfig | 13 + drivers/virt/coco/Makefile | 8 + drivers/virt/coco/sev-guest/Kconfig | 1 drivers/virt/coco/sev-guest/sev-guest.c | 129 ++++++++++++- drivers/virt/coco/tdx-guest/Kconfig | 1 drivers/virt/coco/tsm.c | 290 +++++++++++++++++++++++++++++ include/linux/slab.h | 2 include/linux/tsm.h | 45 +++++ 12 files changed, 535 insertions(+), 19 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-class-tsm create mode 100644 drivers/virt/coco/Kconfig create mode 100644 drivers/virt/coco/Makefile create mode 100644 drivers/virt/coco/tsm.c create mode 100644 include/linux/tsm.h
base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
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