[PATCH v2 1/2] KVM: selftests: Assert GICR_TYPER.Processor_Number matches selftest CPU number

[Maximilian Dittgen]

The selftests GIC library and tests assume that the
GICR_TYPER.Processor_number associated with a given CPU is the same as
the CPU's selftest index.

Since this assumption is not guaranteed by specification, add an assert
in gicv3_cpu_init() that validates this is true.

Signed-off-by: Maximilian Dittgen <mdittgen at amazon.de>
---
 tools/testing/selftests/kvm/lib/arm64/gic_v3.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/kvm/lib/arm64/gic_v3.c b/tools/testing/selftests/kvm/lib/arm64/gic_v3.c
index 66d05506f78b..50158d08117b 100644
--- a/tools/testing/selftests/kvm/lib/arm64/gic_v3.c
+++ b/tools/testing/selftests/kvm/lib/arm64/gic_v3.c
@@ -304,6 +304,9 @@ static void gicv3_cpu_init(unsigned int cpu)
 	redist_base_cpu = gicr_base_cpu(cpu);
 	sgi_base = sgi_base_from_redist(redist_base_cpu);
 
+	/* Verify assumption that GICR_TYPER.Processor_number == cpu */
+	GUEST_ASSERT(((readq_relaxed(redist_base_cpu + GICR_TYPER) >> 8) & 0xffff) == cpu);
+
 	gicv3_enable_redist(redist_base_cpu);
 
 	/*
-- 
2.50.1 (Apple Git-155)




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