linux-kernel - [PATCH v4 5/5] KVM: selftests: arm64: Use is_aarch32_id_reg() in test_vm_ftr_id

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Message-Id: <20260106-kvm-arm64-set-id-regs-aarch64-v4-5-c7ef4551afb3@kernel.org>
Date: Tue, 06 Jan 2026 16:35:45 +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: Ben Horgan <ben.horgan@....com>, 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 v4 5/5] KVM: selftests: arm64: Use is_aarch32_id_reg() in
 test_vm_ftr_id_regs()

test_vm_ftr_id_regs() uses a simplified check for 32 bit ID registers since
it knows it will only run on ID registers. For clarity update this to use
the newly added is_aarch32_id_reg(), there should be no functional change.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/kvm/arm64/set_id_regs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testing/selftests/kvm/arm64/set_id_regs.c
index 908b3c8947d9..f703c6cfe132 100644
--- a/tools/testing/selftests/kvm/arm64/set_id_regs.c
+++ b/tools/testing/selftests/kvm/arm64/set_id_regs.c
@@ -503,7 +503,7 @@ static void test_vm_ftr_id_regs(struct kvm_vcpu *vcpu, bool aarch64_only)
 
 		for (int j = 0;  ftr_bits[j].type != FTR_END; j++) {
 			/* Skip aarch32 reg on aarch64 only system, since they are RAZ/WI. */
-			if (aarch64_only && sys_reg_CRm(reg_id) < 4) {
+			if (aarch64_only && is_aarch32_id_reg(reg_id)) {
 				ksft_print_msg("%s on AARCH64 only system\n",
 					       ftr_bits[j].name);
 				ksft_test_result_skip("%s invalid write rejected\n",

-- 
2.47.3