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Remove "ibpb_exit_to_user" from the host-only feature list if Amazon Linux #5473

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Merged
merged 3 commits into from
Oct 9, 2025
+8 −2
Merged

Remove "ibpb_exit_to_user" from the host-only feature list if Amazon Linux #5473

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cb1b8ea
test: Remove "ibpb_exit_to_user" if not Amazon Linux
zulinx86 Oct 8, 2025
1c2c839
chore: Update kernel version for Ubuntu
zulinx86 Oct 8, 2025
6a9b73b
Merge branch 'main' into ibpb_exit_to_user_on_ubuntu
zulinx86 Oct 9, 2025
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10 changes: 8 additions & 2 deletions 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 @@ -186,17 +186,23 @@ def test_host_vs_guest_cpu_features(uvm_plain_any):
expected_host_minus_guest = INTEL_HOST_ONLY_FEATS
expected_guest_minus_host = INTEL_GUEST_ONLY_FEATS

# Ubuntu hasn't backported the patch for VMScape yet.
# This is only requried for Intel Cascade Lake since we only run
# tests on Intel Cascade Lake for Ubuntu.
if "amzn" not in global_props.host_os:
expected_host_minus_guest -= {"ibpb_exit_to_user"}

# Linux kernel v6.4+ passes through the CPUID bit for "flush_l1d" to guests.
# https://github.com/torvalds/linux/commit/45cf86f26148e549c5ba4a8ab32a390e4bde216e
#
# Our test ubuntu host kernel is v6.8 and has the commit.
# Our test ubuntu host kernel is v6.14 and has the commit.
if global_props.host_linux_version_tpl >= (6, 4):
expected_host_minus_guest -= {"flush_l1d"}

# Linux kernel v6.6+ drops the "invpcid_single" synthetic feature bit.
# https://github.com/torvalds/linux/commit/54e3d9434ef61b97fd3263c141b928dc5635e50d
#
# Our test ubuntu host kernel is v6.8 and has the commit.
# Our test ubuntu host kernel is v6.14 and has the commit.
host_has_invpcid_single = global_props.host_linux_version_tpl < (6, 6)
guest_has_invpcid_single = vm.guest_kernel_version < (6, 6)
if host_has_invpcid_single and not guest_has_invpcid_single:
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