linux-kernel - [PATCH v3 2/4] KVM: selftests: arm64: Report register reset tests individually

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Message-Id: <20251219-kvm-arm64-set-id-regs-aarch64-v3-2-bfa474ec3218@kernel.org>
Date: Fri, 19 Dec 2025 19:28:08 +0000
From: Mark Brown <broonie@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Joey Gouly <joey.gouly@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, 
 Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>, 
 Oliver Upton <oupton@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
 kvm@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH v3 2/4] KVM: selftests: arm64: Report register reset tests
 individually

set_id_regs tests that registers have their values preserved over reset.
Currently it reports all registers in a single test with an instantly fatal
assert which isn't great for diagnostics, it's hard to tell which register
failed or if it's just one register. Change this to report each register as
a separate test so that it's clear from the program output which registers
have problems.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/kvm/arm64/set_id_regs.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testing/selftests/kvm/arm64/set_id_regs.c
index 84e9484a4899..b61942895808 100644
--- a/tools/testing/selftests/kvm/arm64/set_id_regs.c
+++ b/tools/testing/selftests/kvm/arm64/set_id_regs.c
@@ -779,11 +779,18 @@ static void test_assert_id_reg_unchanged(struct kvm_vcpu *vcpu, uint32_t encodin
 {
 	size_t idx = encoding_to_range_idx(encoding);
 	uint64_t observed;
+	bool pass;
 
 	observed = vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(encoding));
-	TEST_ASSERT_EQ(test_reg_vals[idx], observed);
+	pass = test_reg_vals[idx] == observed;
+	if (!pass)
+		ksft_print_msg("%lx != %lx\n", test_reg_vals[idx], observed);
+	ksft_test_result(pass, "%s unchanged by reset\n",
+			 get_reg_name(encoding));
 }
 
+#define ID_REG_RESET_UNCHANGED_TEST (ARRAY_SIZE(test_regs) + 6)
+
 static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu)
 {
 	/*
@@ -801,8 +808,6 @@ static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu)
 	test_assert_id_reg_unchanged(vcpu, SYS_MIDR_EL1);
 	test_assert_id_reg_unchanged(vcpu, SYS_REVIDR_EL1);
 	test_assert_id_reg_unchanged(vcpu, SYS_AIDR_EL1);
-
-	ksft_test_result_pass("%s\n", __func__);
 }
 
 int main(void)
@@ -830,7 +835,8 @@ int main(void)
 
 	ksft_print_header();
 
-	test_cnt = 3 + MPAM_IDREG_TEST + MTE_IDREG_TEST + GUEST_READ_TEST;
+	test_cnt = 2 + MPAM_IDREG_TEST + MTE_IDREG_TEST + GUEST_READ_TEST +
+		ID_REG_RESET_UNCHANGED_TEST;
 	for (i = 0; i < ARRAY_SIZE(test_regs); i++)
 		for (j = 0; test_regs[i].ftr_bits[j].type != FTR_END; j++)
 			test_cnt++;

-- 
2.47.3