KVM: arm64: selftests: arch_timer: Support vCPU migration

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Since the timer stack (hardware and KVM) is per-CPU, there
are potential chances for races to occur when the scheduler
decides to migrate a vCPU thread to a different physical CPU.
Hence, include an option to stress-test this part as well by
forcing the vCPUs to migrate across physical CPUs in the
system at a particular rate.

Originally, the bug for the fix with commit 3134cc8beb
("KVM: arm64: vgic: Resample HW pending state on deactivation")
was discovered using arch_timer test with vCPU migrations and
can be easily reproduced.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211007233439.1826892-16-rananta@google.com

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Raghavendra Rao Ananta 2021-10-07 23:34:39 +00:00 • committed by Marc Zyngier

parent 4959d8650e

commit 61f6fadbf9

1 changed files with 114 additions and 1 deletions

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tools/testing/selftests/kvm/aarch64/arch_timer.c

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