Public bug reported:
SRU Justification:
[Impact]
Google requests that the following upstream commits be removed from 6.14
kernels, namely plucky:linux-gcp and noble:linux-gcp-6.14. These commits
are responsible for a TPM failure encountered on their TDX-enabled
deployments. When present, the following error message is observed
during boot and the TPM is not available.
TPM fail - No TPM chip found
[Fix]
By reverting these two commits, the resulting kernel was verified to not
exhibit the failing case.
6a5abeea9c72e1d2c538622b4cf66c80cc816fd3 ("x86/mtrr: Rename
mtrr_overwrite_state() to guest_force_mtrr_state()")
8e690b817e38769dc2fa0e7473e5a5dc1fc25795 ("x86/kvm: Override default caching
mode for SEV-SNP and TDX")
[Test Plan]
The fix has been verified to work both internally on TDX hardware and
independently by Google.
[What could go wrong]
This change is considered low risk as the commits were cleanly reverted,
and the resulting kernel has been verified to resolve the issue both
internally and by Google.
** Affects: linux-gcp (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-gcp (Ubuntu Noble)
Importance: Undecided
Status: New
** Affects: linux-gcp (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: linux-gcp (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: linux-gcp (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: linux-gcp (Ubuntu Noble)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Invalid
** Changed in: linux-gcp (Ubuntu)
Status: New => Invalid
** Changed in: linux (Ubuntu Noble)
Status: New => Invalid
** Changed in: linux (Ubuntu Plucky)
Status: New => Invalid
** No longer affects: linux (Ubuntu Plucky)
** No longer affects: linux (Ubuntu Noble)
** No longer affects: linux (Ubuntu)
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https://bugs.launchpad.net/bugs/2116545
Title:
Attestation failure due to vTPM device error
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