[v1.12] chore: Add ibpb_exit_to_user as host only feature #5467
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Backport commit 8221464 from main. New Amazon Linux host kernels enable mitigation against VMScape that is IBPB before exit to userspace. However, our guest kernels still haven't had the patches yet. Note that Intel Ice Lake is not affected by VMScape as long as BHB clearing sequence is used to mitigate BHI. Signed-off-by: Takahiro Itazuri <[email protected]>
JackThomson2
approved these changes
Oct 6, 2025
ShadowCurse
approved these changes
Oct 6, 2025
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## firecracker-v1.12 #5467 +/- ##
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Coverage 83.07% 83.07%
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Files 250 250
Lines 26893 26893
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zulinx86
merged commit 7f528b4
into
firecracker-microvm:firecracker-v1.12
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Changes
Backport commit 8221464 from main.
Add ibpb_exit_to_user as host only feature
Reason
New Amazon Linux host kernels enable mitigation against VMScape that is IBPB before exit to userspace. However, our guest kernels still haven't had the patches yet. Note that Intel Ice Lake is not affected by VMScape as long as BHB clearing sequence is used to mitigate BHI.
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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.
[ ] I have mentioned all user-facing changes inCHANGELOG.md.[ ] If a specific issue led to this PR, this PR closes the issue.[ ] When making API changes, I have followed theRunbook for Firecracker API changes.
integration tests.
[ ] I have linked an issue to every newTODO.rust-vmm.