[PATCH v2 0/4] KVM: x86: selftests: Add Hygon CPUs support and fix failures

[Zhiquan Li]

This series to add support for Hygon CPUs and fix 11 KVM selftest failures
on Hygon architecture.

Patch 1 add CPU vendor detection for Hygon and add a global variable
"host_cpu_is_hygon" to identify if the test is running on a Hygon CPU.
It is the prerequisite for the following fixes.

Patch 2 add a flag to identify AMD compatible CPU and figure out the
compatible cases, so that Hygon CPUs can re-use them.
Following test failures on Hygon platform can be fixed by this patch:
- access_tracking_perf_test
- demand_paging_test
- dirty_log_perf_test
- dirty_log_test
- kvm_page_table_test
- memslot_modification_stress_test
- pre_fault_memory_test
- x86/dirty_log_page_splitting_test
- x86/fix_hypercall_test

Patch 3 fix x86/pmu_event_filter_test failure by allowing the tests for
Hygon CPUs.

Patch 4 fix x86/msrs_test failure while writing the MSR_TSC_AUX reserved
bits without RDPID support.
Sean has made a perfect solution for the issue and provided the patch.
It has been verified on Intel, AMD and Hygon platforms, no regression.

---

V1: https://lore.kernel.org/kvm/20260209041305.64906-1-zhiquan_li@xxxxxxx/T/#t

Changes since V1:
- Rebased to kvm-x86/next.
- Followed Sean's suggestion, added a flag to identify AMD compatible test
  cases, then v1/patch 2 and v1/patch 3 can be combined to v2/patch 2.
- Followed Sean's suggestion, simplified patch 4, that is v2/patch 3 now.
- Sean provided the v2/patch 4 for the issue reported by v1/patch5, I
  replaced my SoB with "Reported-by" tag.

---

Sean Christopherson (1):
  KVM: selftests: Fix reserved value WRMSR testcase for multi-feature
    MSRs

Zhiquan Li (3):
  KVM: x86: selftests: Add CPU vendor detection for Hygon
  KVM: x86: selftests: Add a flag to identify AMD compatible test cases
  KVM: x86: selftests: Allow the PMU event filter test for Hygon

 .../testing/selftests/kvm/include/x86/processor.h |  7 +++++++
 tools/testing/selftests/kvm/lib/x86/processor.c   | 15 +++++++++++----
 .../selftests/kvm/x86/fix_hypercall_test.c        |  2 +-
 tools/testing/selftests/kvm/x86/msrs_test.c       |  4 ++--
 .../selftests/kvm/x86/pmu_event_filter_test.c     |  3 ++-
 .../testing/selftests/kvm/x86/xapic_state_test.c  |  2 +-
 6 files changed, 24 insertions(+), 9 deletions(-)


base-commit: e944fe2c09f405a2e2d147145c9b470084bc4c9a
-- 
2.43.0