[PATCH v8 0/9] selftests: KVM: Test offset-based counter controls

[Oliver Upton]

This series implements new tests for the x86 and arm64 counter migration
changes that I've mailed out. These are sent separately as a dependent
change since there are cross-arch dependencies here.

Patch 1 yanks the pvclock headers into the tools/ directory so we can
make use of them within a KVM selftest guest.

Patch 2 tests the new capabilities of the KVM_*_CLOCK ioctls, ensuring
that the kernel accounts for elapsed time when restoring the KVM clock.

Patches 3-4 add some device attribute helpers and clean up some mistakes
in the assertions thereof.

Patch 5 implements a test for the KVM_VCPU_TSC_OFFSET attribute,
asserting that manipulation of the offset results in correct TSC values
within the guest.

Patch 6 adds basic arm64 support to the counter offset test, checking
that the virtual counter-timer offset works correctly. Patch 7 does the
same for the physical counter-timer offset.

Patch 8 adds a benchmark for physical counter offsetting, since most
implementations available right now will rely on emulation.

Lastly, patch 9 extends the get-reg-list test to check for
KVM_REG_ARM_TIMER_OFFSET if userspace opts-in to the kernel capability.

This series applies cleanly to 5.15-rc1

Tests were ran against the respective architecture changes on the
following systems:

 - Haswell (x86)
 - Ampere Mt. Jade (non-ECV, nVHE and VHE)

v7: https://lore.kernel.org/r/20210816001246.3067312-1-oupton@google.com

v7 -> v8:
 - Rebased to 5.15-rc1
 - Dropped helper for checking if reg exists in reg list (no longer
   necessary)
 - Test and enable KVM_CAP_ARM_VTIMER_OFFSET
 - Add get-reg-list changes

Oliver Upton (9):
  tools: arch: x86: pull in pvclock headers
  selftests: KVM: Add test for KVM_{GET,SET}_CLOCK
  selftests: KVM: Fix kvm device helper ioctl assertions
  selftests: KVM: Add helpers for vCPU device attributes
  selftests: KVM: Introduce system counter offset test
  selftests: KVM: Add support for aarch64 to system_counter_offset_test
  selftests: KVM: Test physical counter offsetting
  selftests: KVM: Add counter emulation benchmark
  selftests: KVM: Test vtimer offset reg in get-reg-list

 tools/arch/x86/include/asm/pvclock-abi.h      |  48 ++++
 tools/arch/x86/include/asm/pvclock.h          | 103 ++++++++
 tools/testing/selftests/kvm/.gitignore        |   3 +
 tools/testing/selftests/kvm/Makefile          |   4 +
 .../kvm/aarch64/counter_emulation_benchmark.c | 207 ++++++++++++++++
 .../selftests/kvm/aarch64/get-reg-list.c      |  42 ++++
 .../selftests/kvm/include/aarch64/processor.h |  24 ++
 .../testing/selftests/kvm/include/kvm_util.h  |  11 +
 tools/testing/selftests/kvm/lib/kvm_util.c    |  44 +++-
 .../kvm/system_counter_offset_test.c          | 220 ++++++++++++++++++
 .../selftests/kvm/x86_64/kvm_clock_test.c     | 204 ++++++++++++++++
 11 files changed, 907 insertions(+), 3 deletions(-)
 create mode 100644 tools/arch/x86/include/asm/pvclock-abi.h
 create mode 100644 tools/arch/x86/include/asm/pvclock.h
 create mode 100644 tools/testing/selftests/kvm/aarch64/counter_emulation_benchmark.c
 create mode 100644 tools/testing/selftests/kvm/system_counter_offset_test.c
 create mode 100644 tools/testing/selftests/kvm/x86_64/kvm_clock_test.c

-- 
2.33.0.464.g1972c5931b-goog