linux-kernel - [PATCH 0/5] KVM: selftests: Fix clocksource requirements in tests

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Date: Tue,  9 Jan 2024 15:11:16 +0100
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: kvm@...r.kernel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>
Cc: Oliver Upton <oupton@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] KVM: selftests: Fix clocksource requirements in tests

It was discovered that 'hyperv_clock' fails miserably when the system is
using an unsupported (by KVM) clocksource, e.g. 'kvm-clock'. The root cause
of the failure is that 'hyperv_clock' doesn't actually check which clocksource
is currently in use. Other tests (kvm_clock_test, vmx_nested_tsc_scaling_test)
have the required check but each test does it on its own.

Generalize clocksource checking infrastructure, make all three clocksource
dependent tests run with 'tsc' and 'hyperv_clocksource_tsc_page', and skip
gracefully when run in an unsupported configuration.

The last patch of the series is a loosely related minor nitpick for KVM
code itself.

Vitaly Kuznetsov (5):
  KVM: selftests: Generalize check_clocksource() from kvm_clock_test
  KVM: selftests: Use generic sys_clocksource_is_tsc() in
    vmx_nested_tsc_scaling_test
  KVM: selftests: Run clocksource dependent tests with
    hyperv_clocksource_tsc_page too
  KVM: selftests: Make hyperv_clock require TSC based system clocksource
  KVM: x86: Make gtod_is_based_on_tsc() return 'bool'

 arch/x86/kvm/x86.c                            |  2 +-
 .../testing/selftests/kvm/include/test_util.h |  2 +
 .../selftests/kvm/include/x86_64/processor.h  |  2 +
 tools/testing/selftests/kvm/lib/test_util.c   | 25 ++++++++++++
 .../selftests/kvm/lib/x86_64/processor.c      | 15 ++++++++
 .../selftests/kvm/x86_64/hyperv_clock.c       |  1 +
 .../selftests/kvm/x86_64/kvm_clock_test.c     | 38 +------------------
 .../kvm/x86_64/vmx_nested_tsc_scaling_test.c  | 19 +---------
 8 files changed, 48 insertions(+), 56 deletions(-)

base-commit: 7f26fea9bc085290e3731501f4f8fc5b82b9d615
-- 
2.43.0