test: Add waitpkg to host-minus-guest features

zulinx86 · zulinx86 · commit 4f1b59c2bddc · 2025-03-28T09:29:09.000Z
We disabled WAITPKG intentionally since it can put a physical processor
into an implementation-depedent optimized state. So it should not exist
in guest.

Signed-off-by: Takahiro Itazuri &lt;itazur@amazon.com&gt;
diff --git a/tests/integration_tests/functional/test_cpu_features_host_vs_guest.py b/tests/integration_tests/functional/test_cpu_features_host_vs_guest.py
@@ -274,6 +274,9 @@ def test_host_vs_guest_cpu_features(uvm_plain_any):
                 # is not enumerated on CPUID, instead detected by actually attempting to read from
                 # MSR address 0x33 (MSR_MEMORY_CTRL in Intel SDM, MSR_TEST_CTRL in Linux kernel).
                 "split_lock_detect",
+                # Firecracker disables WAITPKG in CPUID normalization.
+                # https://github.com/firecracker-microvm/firecracker/pull/5118
+                "waitpkg",
             }
 
             # The following features are also not virtualized by KVM yet but are only supported on

Original file line number	Diff line number	Diff line change
`@@ -274,6 +274,9 @@ def test_host_vs_guest_cpu_features(uvm_plain_any):`
`274`	`274`	`# is not enumerated on CPUID, instead detected by actually attempting to read from`
`275`	`275`	`# MSR address 0x33 (MSR_MEMORY_CTRL in Intel SDM, MSR_TEST_CTRL in Linux kernel).`
`276`	`276`	`"split_lock_detect",`
	`277`	`+ # Firecracker disables WAITPKG in CPUID normalization.`
	`278`	`+ # https://github.com/firecracker-microvm/firecracker/pull/5118`
	`279`	`+ "waitpkg",`
`277`	`280`	`}`
`278`	`281`
`279`	`282`	`# The following features are also not virtualized by KVM yet but are only supported on`