mbox series

[kvm-unit-tests,0/3] arm: pmu: Add support for PMUv3p5

Message ID 20221202045527.3646838-1-ricarkol@google.com (mailing list archive)
Headers show
Series arm: pmu: Add support for PMUv3p5 | expand

Message

Ricardo Koller Dec. 2, 2022, 4:55 a.m. UTC 
The first commit fixes the tests when running on PMUv3p5. The issue is that
PMUv3p5 uses 64-bit counters irrespective of whether the PMU is configured
for overflowing at 32 or 64-bits. Tests are currently failing [0] on
PMUv3p5 because of this. They wrongly assume that values will be wrapped
around 32-bits, but they overflow into the other half of the 64-bit
counters.

The second and third commits add new tests for 64-bit overflows, a feature
added with PMUv3p5 (PMCR_EL0.LP == 1). This is done by running all
overflow-related tests in two modes: with 32-bit and 64-bit overflows.

This series was tested on PMUv3p5 and PMUv3p4 using the ARM Fast Model and
kvmtool.  All tests pass on both PMUv3p5 and PMUv3p4 when using Marc's
PMUv3p5 series [0], plus the suggestion made at [1]. Didn't test AArch32.

[0] https://lore.kernel.org/kvmarm/20221113163832.3154370-1-maz@kernel.org/
[1] https://lore.kernel.org/kvmarm/Y4jasyxvFRNvvmox@google.com/

Ricardo Koller (3):
  arm: pmu: Fix overflow checks for PMUv3p5 long counters
  arm: pmu: Prepare for testing 64-bit overflows
  arm: pmu: Add tests for 64-bit overflows

 arm/pmu.c | 217 +++++++++++++++++++++++++++++++++---------------------
 1 file changed, 133 insertions(+), 84 deletions(-)