[PATCH v2 0/3] KVM: arm64: selftests: Add edge cases tests for the arch timer

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Add a new selftests that validates some edge cases related to the virtual
arch-timer, for example:
- timers across counter roll-overs.
- moving counters ahead and behind pending timers.
- having the same timer condition firing multiple times.

The tests run while checking the state of the IRQs (e.g., pending when they
are supposed to be) and stressing things a bit by waiting for interrupts
while: re-scheduling the vcpu (with sched_yield()), by migrating the vcpu
between cores, or by sleeping in userspace (with usleep()).

The first commit adds a timer utility function.  The second commit adds
some sanity checks and basic tests for the timer. The third commit adds
the actual edge case tests (like forcing rollovers).

v1 -> v2:
- Remove the checks for timers firing within some margin; only leave the
  checks for timers not firing ahead of time. Also remove the tests that
  depend on timers firing within some margin. [Oliver, Marc]
- Collect R-b tag from Oliver (first commit). [Oliver]
- Multiple nits: replace wfi_ functions with wait_, reduce use of macros,
  drop typedefs, use IAR_SPURIOUS from header, move some comments functions
  to top. [Oliver]
- Don't fail if the test has a single cpu available. [Oliver]
- Don't fail if there's no GICv3 available. [Oliver]

v1: https://lore.kernel.org/kvmarm/20220302172144.2734258-1-ricarkol@xxxxxxxxxx/

There is a slight complication with where this series applies.  The test added
here fails without commit cc94d47ce16d ("kvm: selftests: aarch64: fix assert in
gicv3_access_reg") which lives in kvmarm/next.  However, it can't be built on
top of kvmarm/next as it depends on commit 456f89e0928a ("KVM: selftests:
aarch64: Skip tests if we can't create a vgic-v3") which is not in kvmarm/next.

Ricardo Koller (3):
  KVM: arm64: selftests: add timer_get_tval() lib function
  KVM: arm64: selftests: add arch_timer_edge_cases
  KVM: arm64: selftests: add edge cases tests into arch_timer_edge_cases

 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   1 +
 .../kvm/aarch64/arch_timer_edge_cases.c       | 891 ++++++++++++++++++
 .../kvm/include/aarch64/arch_timer.h          |  18 +-
 4 files changed, 910 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/kvm/aarch64/arch_timer_edge_cases.c

-- 
2.35.1.723.g4982287a31-goog

_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm



[Index of Archives]     [Linux KVM]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux