Ubuntu 23.04 (Lunar Lobster) has reached end of life, so this bug will
not be fixed for that specific release.
** Changed in: linux-gcp (Ubuntu Lunar)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/2034908
Title:
Add support for 3 TDX subfeatures
Status in linux-gcp package in Ubuntu:
New
Status in linux-gcp source package in Lunar:
Won't Fix
Bug description:
Support is requested for 3 TDX-specific features:
- Unaccepted memory, aka "lazy memory accept"
- TDX "Get Quote" - is needed for attestation
- Marking the TSC as reliable
More information at:
https://canonical.lightning.force.com/lightning/r/Case/5008e00000FTWGcAAP/view
Testing:
Intel has provided code review for the first 2 and has additionally tested
the GetQuote feature.
GCP has tested all three features and confirmed basic functionality and
sanity. More testing will follow when the changes are available in -proposed
and before feature release.
Regression potential:
Most of the code changes are to the following files:
arch/x86/coco/tdx
drivers/virt/coco/tdx-guest/tdx-guest.c
mm/memblock.c
mm/memory_hotplug.c
mm/page_alloc.c
mm/vmstat.c
Most of it is new code which is inside #ifdef CONFIG_UNACCEPTED_MEMORY
There is 1 tree-wide change "mm, treewide: redefine MAX_ORDER sanely"
that affects many files and looks scary, but should be safe as it is
basically a refactor.
Generally speaking, the code changes here affect early memory
initialization on x86 so can impact anything in that area, but
realistically should only affect TDX instances (especially ones with
>4GB as that is when the unaccepted-memory feature is activated).
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