chore: Add ibpb_exit_to_user as host only feature #5464
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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]>
zulinx86
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Status: Awaiting review
JackThomson2
approved these changes
Oct 6, 2025
ShadowCurse
approved these changes
Oct 6, 2025
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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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