linux-kernel - [PATCH v2 0/3] KVM: arm64: selftests: arch_timer_edge

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Message-ID: <20250527142434.25209-1-sebott@redhat.com>
Date: Tue, 27 May 2025 16:24:31 +0200
From: Sebastian Ott <sebott@...hat.com>
To: Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>
Cc: Colton Lewis <coltonlewis@...gle.com>,
	Ricardo Koller <ricarkol@...gle.com>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Shuah Khan <shuah@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Sebastian Ott <sebott@...hat.com>
Subject: [PATCH v2 0/3] KVM: arm64: selftests: arch_timer_edge_cases fixes

Some small fixes for arch_timer_edge_cases that I stumbled upon
while debugging failures for this selftest on ampere-one.

Changes since v1: modified patch 3 based on suggestions from Marc.

I've done some tests with this on various machines - seems to be all
good, however on ampere-one I now hit this in 10% of the runs:
==== Test Assertion Failure ====
  arm64/arch_timer_edge_cases.c:481: timer_get_cntct(timer) >= DEF_CNT + (timer_get_cntfrq() * (uint64_t)(delta_2_ms) / 1000)
  pid=166657 tid=166657 errno=4 - Interrupted system call
     1  0x0000000000404db3: test_run at arch_timer_edge_cases.c:933
     2  0x0000000000401f9f: main at arch_timer_edge_cases.c:1062
     3  0x0000ffffaedd625b: ?? ??:0
     4  0x0000ffffaedd633b: ?? ??:0
     5  0x00000000004020af: _start at ??:?
  timer_get_cntct(timer) >= DEF_CNT + msec_to_cycles(delta_2_ms)

This is not new, it was just hidden behind the other failure. I'll
try to figure out what this is about (seems to be independent of
the wait time)..


Sebastian Ott (3):
  KVM: arm64: selftests: fix help text for arch_timer_edge_cases
  KVM: arm64: selftests: fix thread migration in arch_timer_edge_cases
  KVM: arm64: selftests: arch_timer_edge_cases - determine effective counter width

 .../kvm/arm64/arch_timer_edge_cases.c         | 37 ++++++++++++-------
 1 file changed, 24 insertions(+), 13 deletions(-)


base-commit: 0ff41df1cb268fc69e703a08a57ee14ae967d0ca
-- 
2.49.0