[Bug 2064345] [NEW] Power guest secure boot with key management: userspace portion

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Covering the userspace portion (secvarctl)

Feature:

This feature comprises PowerVM LPAR guest OS kernel verification to
extend the chain of trust from partition firmware to the OS kernel and
includes key management.  GRUB and the host OS kernel are signed with 2
separate public key pairs.  Partition firmware includes the the public
verification key for GRUB in its build and uses it to verify GRUB.  GRUB
includes the public verification key for the OS kernel in its build and
uses it to verify the OS kernel image

Test case:

If secure boot is switched off, any GRUB and kernel boots.
If secure boot is switched on:
  - Properly signed GRUB boots.
  - Improperly signed GRUB does not boot.
  - Tampered signed GRUB does not boot.
  - Properly signed kernels boot.
  - Improperly signed kernels do not boot.
  - Tampered signed kernels do not boot.
TPM PCRs are extended roughly following the TCG PC Client and UEFI specs as they apply to POWER.

** Affects: ubuntu-power-systems
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New

** Affects: powerpc-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bugnameltc-205843 severity-critical targetmilestone-inin2410
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Power guest secure boot with key management: userspace portion
https://bugs.launchpad.net/bugs/2064345
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