[RFC,kvm-unit-tests,0/4] x86/apic: SVM AVIC tests and some cleanups

Message

Naveen N Rao (AMD) Feb. 25, 2025, 10:40 a.m. UTC

The first patch is a small cleanup. The next two patches update tests to 
disable PIT so that SVM AVIC can be exercized. The last patch adds a 
test for x1apic-split.

The last patch causes aliased apic_id ipi test to fail with older qemu 
versions. Qemu v6.2 and before used to enable 
KVM_X2APIC_API_USE_32BIT_IDS KVM quirk in some scenarios, and this was 
changed in commit dc89f32d92bb ("target/i386: Fix sanity check on max 
APIC ID / X2APIC enablement") to be enabled only if there are > 255 
vcpus. The KUT test does talk about this assumption in a comment:
  /*
   * By default, KVM doesn't follow the x86 APIC architecture for aliased
   * APIC IDs if userspace has enabled KVM_X2APIC_API_USE_32BIT_IDS.
   * If x2APIC is supported, assume the userspace VMM has enabled 32-bit
   * IDs and thus activated KVM's quirk.  Delete this code to run the
   * aliasing test on x2APIC CPUs, e.g. to run it on bare metal.
   */

That looks to suggest that this is an expected failure, but it would be 
good to get confirmation on the same.


Thanks,
Naveen



Naveen N Rao (AMD) (4):
  x86/apic: Move ioapic tests together and add them to apic test group
  x86/apic: Disable PIT for x2apic test to allow SVM AVIC to be tested
  x86/apic: Disable PIT for ioapic test to allow SVM AVIC to be tested
  x86/apic: Add test for xapic-split

 x86/unittests.cfg | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)


base-commit: 699264f5ef8129c60e9db7c281e572016ad41a45