[v7,0/9] selftests: KVM: Test offset-based counter controls

Message

Oliver Upton Aug. 16, 2021, 12:12 a.m. UTC

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 a helper to check if KVM supports a given register in the
KVM_*_REG ioctls.

Patch 7 adds basic arm64 support to the counter offset test, checking
that the virtual counter-timer offset works correctly. Patch 8 does the
same for the physical counter-timer offset.

Patch 9 adds a benchmark for physical counter offsetting, since most
implementations available right now will rely on emulation.

This series applies cleanly to kvm/queue at the following commit:

3e0b8bd99ab ("KVM: MMU: change tracepoints arguments to kvm_page_fault")

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

 - Haswell (x86)
 - Ampere Mt. Jade (non-ECV, nVHE and VHE)
 - ARM Base RevC FVP (ECV, nVHE and VHE)

*NOTE*: Though this tests changes between both x86 and arm64, these
tests check for capabilities and skip if missing, so its OK if they're
merged in trees that lack the patches for both architectures.

v6: https://lore.kernel.org/r/[e-mail]

v6 -> v7:
 - adapted to UAPI renaming for physical counter offsetting on arm64

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 helper to check for register presence
  selftests: KVM: Add support for aarch64 to system_counter_offset_test
  selftests: KVM: Test physical counter offsetting
  selftests: KVM: Add counter emulation benchmark

 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/include/aarch64/processor.h |  24 ++
 .../testing/selftests/kvm/include/kvm_util.h  |  13 ++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  63 +++++-
 .../kvm/system_counter_offset_test.c          | 211 ++++++++++++++++++
 .../selftests/kvm/x86_64/kvm_clock_test.c     | 204 +++++++++++++++++
 10 files changed, 877 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