[PATCH v8 2/3] KVM: selftests: arm64: Report register reset tests individually

[Mark Brown <broonie@kernel.org>]

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.

Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/kvm/arm64/set_id_regs.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testing/selftests/kvm/arm64/set_id_regs.c
index db6414a93ad3..3aa8886e8b70 100644
--- a/tools/testing/selftests/kvm/arm64/set_id_regs.c
+++ b/tools/testing/selftests/kvm/arm64/set_id_regs.c
@@ -819,13 +819,21 @@ static void test_vcpu_non_ftr_id_regs(struct kvm_vcpu *vcpu)
 static void test_assert_id_reg_unchanged(struct kvm_vcpu *vcpu, u32 encoding)
 {
 	size_t idx = encoding_to_range_idx(encoding);
-	u64 observed;
+	u64 observed, expected;
+	bool pass;
 
 	observed = vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(encoding));
-	TEST_ASSERT_EQ(reset_mutable_bits(encoding, test_reg_vals[idx]),
-		       reset_mutable_bits(encoding, observed));
+	observed = reset_mutable_bits(encoding, observed);
+	expected = reset_mutable_bits(encoding, test_reg_vals[idx]);
+	pass = expected == observed;
+	if (!pass)
+		ksft_print_msg("%lx != %lx\n", expected, observed);
+	ksft_test_result(pass, "%s unchanged by reset\n",
+			 get_reg_name(encoding));
 }
 
+#define ID_REG_RESET_UNCHANGED_TEST (ARRAY_SIZE(test_regs) + NUM_EXTRA_REGS)
+
 static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu)
 {
 	/*
@@ -843,8 +851,6 @@ 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)
@@ -872,7 +878,8 @@ 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