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Use guest kernel 6.1 as default for tests where only a single kernel is tested#5732

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Manciukic:default-guest-kernel-6.1
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Use guest kernel 6.1 as default for tests where only a single kernel is tested#5732
Manciukic wants to merge 3 commits intofirecracker-microvm:mainfrom
Manciukic:default-guest-kernel-6.1

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Changes

Switch tests that use uvm_plain and other tests manually setting to 5.10 to use 6.1

Reason

These tests don't care about the underlying kernel. Move them to the latest (and most widely used) one.

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PR Checklist

  • I have read and understand CONTRIBUTING.md.
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    build checks on all supported architectures.
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    automated style checks.
  • I have described what is done in these changes, why they are needed, and
    how they are solving the problem in a clear and encompassing way.
  • I have updated any relevant documentation (both in code and in the docs)
    in the PR.
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    Runbook for Firecracker API changes.
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  • This functionality cannot be added in rust-vmm.

Introduce a new fixture used by tests that don't care about the kernel
version.
This will make it easier to switch the default version in the next
commits.

Signed-off-by: Riccardo Mancini <mancio@amazon.com>
We expect most customers to use 6.1 rather than 5.10 nowadays.

Signed-off-by: Riccardo Mancini <mancio@amazon.com>
As now uvm_plain is 6.1, drop uvm_plain_6_1 and use uvm_plain directly
in those tests.
No changes to the tests.

Signed-off-by: Riccardo Mancini <mancio@amazon.com>
@Manciukic Manciukic force-pushed the default-guest-kernel-6.1 branch from f4230ad to 7431683 Compare March 2, 2026 13:28
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codecov bot commented Mar 2, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.18%. Comparing base (cc1a614) to head (7431683).

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #5732   +/-   ##
=======================================
  Coverage   83.18%   83.18%           
=======================================
  Files         277      277           
  Lines       29431    29431           
=======================================
  Hits        24481    24481           
  Misses       4950     4950           
Flag Coverage Δ
5.10-m5n.metal 83.47% <ø> (ø)
5.10-m6a.metal 82.81% <ø> (+<0.01%) ⬆️
5.10-m6g.metal 80.19% <ø> (ø)
5.10-m6i.metal 83.47% <ø> (ø)
5.10-m7a.metal-48xl 82.80% <ø> (+<0.01%) ⬆️
5.10-m7g.metal 80.18% <ø> (-0.01%) ⬇️
5.10-m7i.metal-24xl 83.45% <ø> (ø)
5.10-m7i.metal-48xl 83.44% <ø> (ø)
5.10-m8g.metal-24xl 80.18% <ø> (ø)
5.10-m8g.metal-48xl 80.18% <ø> (ø)
5.10-m8i.metal-48xl 83.44% <ø> (-0.01%) ⬇️
5.10-m8i.metal-96xl 83.45% <ø> (+<0.01%) ⬆️
6.1-m5n.metal 83.50% <ø> (+<0.01%) ⬆️
6.1-m6a.metal 82.83% <ø> (-0.01%) ⬇️
6.1-m6g.metal 80.19% <ø> (ø)
6.1-m6i.metal 83.50% <ø> (+<0.01%) ⬆️
6.1-m7a.metal-48xl 82.83% <ø> (ø)
6.1-m7g.metal 80.18% <ø> (-0.01%) ⬇️
6.1-m7i.metal-24xl 83.51% <ø> (-0.01%) ⬇️
6.1-m7i.metal-48xl 83.51% <ø> (ø)
6.1-m8g.metal-24xl 80.18% <ø> (ø)
6.1-m8g.metal-48xl 80.18% <ø> (ø)
6.1-m8i.metal-48xl 83.52% <ø> (ø)
6.1-m8i.metal-96xl 83.52% <ø> (+<0.01%) ⬆️

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