Commit 31df012d authored by Maximilian Dittgen's avatar Maximilian Dittgen Committed by Oliver Upton
Browse files

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



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: default avatarMaximilian Dittgen <mdittgen@amazon.de>
Link: https://msgid.link/20251119135744.68552-1-mdittgen@amazon.de


Signed-off-by: default avatarOliver Upton <oupton@kernel.org>
parent cb17d79f

tools/testing/selftests/kvm/lib/arm64/gic_v3.c

+5 −0
Original line number Diff line number Diff line
@@ -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);



	/*