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chore: Add ibpb_exit_to_user as host only feature #5464

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Merged
merged 1 commit into from
Oct 6, 2025
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chore: Add ibpb_exit_to_user as host only feature #5464

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11 changes: 10 additions & 1 deletion tests/integration_tests/functional/test_cpu_features_host_vs_guest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@
"hwp_act_window",
"hwp_epp",
"hwp_pkg_req",
"ibpb_exit_to_user",
"ida",
"intel_ppin",
"intel_pt",
Expand Down Expand Up @@ -93,6 +94,7 @@
"extapic",
"flushbyasid",
"hw_pstate",
"ibpb_exit_to_user",
"ibs",
"irperf",
"lbrv",
Expand Down Expand Up @@ -206,7 +208,14 @@ def test_host_vs_guest_cpu_features(uvm_plain_any):
assert guest_feats - host_feats == expected_guest_minus_host

case CpuModel.INTEL_ICELAKE:
host_guest_diff_5_10 = INTEL_HOST_ONLY_FEATS - {"cdp_l3"} | {
expected_host_minus_guest = INTEL_HOST_ONLY_FEATS

# As long as BHB clearing software mitigation is enabled, Intel Ice Lake is not
# vulnerable to VMScape and "IBPB before exit to userspace" is not needed.
# https://docs.kernel.org/admin-guide/hw-vuln/vmscape.html#affected-processors
expected_host_minus_guest -= {"ibpb_exit_to_user"}

host_guest_diff_5_10 = expected_host_minus_guest - {"cdp_l3"} | {
"pconfig",
"tme",
"split_lock_detect",
Expand Down