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KVM: selftests: Assert GICR_TYPER.Processor_Number matches selftest CPU number

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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@amazon.de>
Link: https://msgid.link/20251119135744.68552-1-mdittgen@amazon.de
Signed-off-by: Oliver Upton <oupton@kernel.org>
This commit is contained in:
Maximilian Dittgen
2025-11-19 14:57:43 +01:00
committed by Oliver Upton
parent cb17d79ff5
commit 31df012da4
1 changed files with 5 additions and 0 deletions
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5
tools/testing/selftests/kvm/lib/arm64/gic_v3.c
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@@ -298,12 +298,17 @@ static void gicv3_cpu_init(unsigned int cpu)
volatile void *sgi_base;
unsigned int i;
volatile void *redist_base_cpu;
u64 typer;
GUEST_ASSERT(cpu < gicv3_data.nr_cpus);
redist_base_cpu = gicr_base_cpu(cpu);
sgi_base = sgi_base_from_redist(redist_base_cpu);
/* Verify assumption that GICR_TYPER.Processor_number == cpu */
typer = readq_relaxed(redist_base_cpu + GICR_TYPER);
GUEST_ASSERT_EQ(GICR_TYPER_CPU_NUMBER(typer), cpu);
gicv3_enable_redist(redist_base_cpu);
/*