KVM: selftests: Add stress test for LPI injection

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Now that all the infrastructure is in place, add a test to stress KVM's
LPI injection. Keep a 1:1 mapping of device IDs to signalling threads,
allowing the user to scale up/down the sender side of an LPI. Make use
of the new VM stats for the translation cache to estimate the
translation hit rate.

Since the primary focus of the test is on performance, you'll notice
that the guest code is not pedantic about the LPIs it receives. Counting
the number of LPIs would require synchronization between the device and
vCPU threads to avoid coalescing and would get in the way of performance
numbers.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240422200158.2606761-20-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Oliver Upton 2024-04-22 20:01:58 +00:00 • committed by Marc Zyngier

parent c3c369b508

commit 96d36ad95b

2 changed files with 411 additions and 0 deletions

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1

tools/testing/selftests/kvm/Makefile

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410

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

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