** Tags added: kernel-daily-bug
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https://bugs.launchpad.net/bugs/2116545
Title:
Attestation failure due to vTPM device error
Status in linux-gcp package in Ubuntu:
In Progress
Status in linux-gcp source package in Noble:
In Progress
Status in linux-gcp source package in Plucky:
In Progress
Status in linux-gcp source package in Questing:
In Progress
Bug description:
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.
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