KVM: selftests: Add stress test for LPI injection

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 <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Marc Zyngier <[email protected]>
torvalds · Apr 25, 2024 · 96d36ad · 96d36ad
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diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
@@ -158,6 +158,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/smccc_filter
 TEST_GEN_PROGS_aarch64 += aarch64/vcpu_width_config
 TEST_GEN_PROGS_aarch64 += aarch64/vgic_init
 TEST_GEN_PROGS_aarch64 += aarch64/vgic_irq
+TEST_GEN_PROGS_aarch64 += aarch64/vgic_lpi_stress
 TEST_GEN_PROGS_aarch64 += aarch64/vpmu_counter_access
 TEST_GEN_PROGS_aarch64 += access_tracking_perf_test
 TEST_GEN_PROGS_aarch64 += arch_timer