From nobody Mon Feb 9 23:57:58 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F15033F8C2; Fri, 19 Dec 2025 19:29:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766172543; cv=none; b=JvHsICmKQq2Blkhn/27ZmaCs208U+Mc+iRkMF16UtjkhQRfGVIFEyCmVl+5Y3Ey1CNN0RH05oWYw5kVBGb01AvN4xX/2qGKtI485KWCP+8drGxmmqJRajjSA8OOR/XdN1iPbFbnWiyxaL5lCA2a+RnJrli2+bpQ7D64Z4P7V6rs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766172543; c=relaxed/simple; bh=ePyIOcLw3qUF6qAyJngOGuOfqRNYRlISmZ1orSZP0mk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=XSW93ECi6QvFa7aNFCuHIrRL1O3o0EJIN8JoJdJc6/2dBjT1WpBzd3BRFLNJ457JCVAzdkQz20IATtgYjYaKUZaPEQYGRoISJF8w40sU7LX2p0GL0D503uiiqdanhUnaUbLVD5Sn+vbQ1yuV6lzXXLqpt/eOkWTYn5Me7avoJfg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XfxsieM3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XfxsieM3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43E6BC4CEF1; Fri, 19 Dec 2025 19:28:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766172541; bh=ePyIOcLw3qUF6qAyJngOGuOfqRNYRlISmZ1orSZP0mk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=XfxsieM3KG2nemYgQZrRsqd2l9fZxnvc5TOZERMw7b+8ex5T6qtxVYRB+erKJWDI6 vpHXNGStP3jVV7ZDNKCPe3xQLbrMUxgjdagn7sDh3RUs2wQJ0d5BVwgTMBOOaQqeLP fPKuO5hO8wE4+qTI/YdLKSjRKvG64a5Z5K+QV07i4Uex27/QL1kyQYbBF6HvuM5OaU /tMt0+isLP3ieW59RXavIzA5tttN9xjTWYbknYXI0WNnmgv59tLSJcWVh19QGTYwPU 5bHalpaN97kMHjo+/dAY7lQFfpOYiYsyVN4kuhLk3vua/fxje63/sHW+xWlLLOFES/ Bg6Kb+CR/S5kA== From: Mark Brown Date: Fri, 19 Dec 2025 19:28:10 +0000 Subject: [PATCH v3 4/4] KVM: selftests: arm64: Skip all 32 bit IDs when set_id_regs is aarch64 only Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251219-kvm-arm64-set-id-regs-aarch64-v3-4-bfa474ec3218@kernel.org> References: <20251219-kvm-arm64-set-id-regs-aarch64-v3-0-bfa474ec3218@kernel.org> In-Reply-To: <20251219-kvm-arm64-set-id-regs-aarch64-v3-0-bfa474ec3218@kernel.org> To: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Paolo Bonzini , Shuah Khan , Oliver Upton Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; a=openpgp-sha256; l=4530; i=broonie@kernel.org; h=from:subject:message-id; bh=ePyIOcLw3qUF6qAyJngOGuOfqRNYRlISmZ1orSZP0mk=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBpRadv2AkLNtWtMjbY/XUUsUHGKaC7S3EPyHEjy ctjsXQSieWJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaUWnbwAKCRAk1otyXVSH 0HErB/0UKCEgiBTrpFERnJ4P/ggQezbnaMjbAqIfCY4o9cf3hDHlm637ZGRBLslfyNwMWhaD+Qf TktFtQtkhOIuO7JuGYgW/yoCkm+2s1KSkH6UFNgqlaF60Sc1TyiN5IMLj89+ekC84Yqm0NC1hmt z9+GkBKXHsiIdjYrnghmkSbNRmyh+WvHgPkugUJQb8lh9bjG/Arorb4fL44WK6pPIdv7MscI4c0 6si7NnhyeWXs1/9Drq2jI+jMQlOVSrRpoQw73tS1GUj8BQHVvHnpm/Q+3tZqZvFg1O7k9peoagp MVx42cpsr8NFNmpgL6KKfTL9Xfe25XJRsnIRlzLGiT2StMPq X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB On an aarch64 only system the 32 bit ID registers have UNDEFINED values. As a result set_id_regs skips tests for setting fields in these registers when testing an aarch64 only guest. This has the side effect of meaning that we don't record an expected value for these registers, meaning that when the subsequent tests for values being visible in guests and preserved over reset check the value they can spuriously fail. This can be seen by running on an emulated system with both NV and 32 bit enabled, NV will result in the guests created by the test program being 64 bit only but the 32 bit ID registers will have values. Also skip those tests that use the values set in the field setting tests for aarch64 only guests in order to avoid these spurious failures. Signed-off-by: Mark Brown --- tools/testing/selftests/kvm/arm64/set_id_regs.c | 42 +++++++++++++++++----= ---- 1 file changed, 29 insertions(+), 13 deletions(-) diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testin= g/selftests/kvm/arm64/set_id_regs.c index 5837da63e9b9..f19ba949aa18 100644 --- a/tools/testing/selftests/kvm/arm64/set_id_regs.c +++ b/tools/testing/selftests/kvm/arm64/set_id_regs.c @@ -675,7 +675,7 @@ static void test_user_set_mte_reg(struct kvm_vcpu *vcpu) ksft_test_result_pass("ID_AA64PFR1_EL1.MTE_frac no longer 0xF\n"); } =20 -static void test_guest_reg_read(struct kvm_vcpu *vcpu) +static void test_guest_reg_read(struct kvm_vcpu *vcpu, bool aarch64_only) { bool done =3D false; struct ucall uc; @@ -694,6 +694,13 @@ static void test_guest_reg_read(struct kvm_vcpu *vcpu) reg_id =3D uc.args[2]; guest_val =3D uc.args[3]; expected_val =3D test_reg_vals[encoding_to_range_idx(reg_id)]; + + if (aarch64_only && sys_reg_CRm(reg_id) < 4) { + ksft_test_result_skip("%s value seen in guest\n", + get_reg_name(reg_id)); + break; + } + match =3D expected_val =3D=3D guest_val; if (!match) ksft_print_msg("%lx !=3D %lx\n", @@ -785,12 +792,19 @@ static void test_vcpu_non_ftr_id_regs(struct kvm_vcpu= *vcpu) ksft_test_result_pass("%s\n", __func__); } =20 -static void test_assert_id_reg_unchanged(struct kvm_vcpu *vcpu, uint32_t e= ncoding) +static void test_assert_id_reg_unchanged(struct kvm_vcpu *vcpu, uint32_t e= ncoding, + bool aarch64_only) { size_t idx =3D encoding_to_range_idx(encoding); uint64_t observed; bool pass; =20 + if (aarch64_only && sys_reg_CRm(encoding) < 4) { + ksft_test_result_skip("%s unchanged by reset\n", + get_reg_name(encoding)); + return; + } + observed =3D vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(encoding)); pass =3D test_reg_vals[idx] =3D=3D observed; if (!pass) @@ -801,7 +815,8 @@ static void test_assert_id_reg_unchanged(struct kvm_vcp= u *vcpu, uint32_t encodin =20 #define ID_REG_RESET_UNCHANGED_TEST (ARRAY_SIZE(test_regs) + 6) =20 -static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu) +static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu, + bool aarch64_only) { /* * Calls KVM_ARM_VCPU_INIT behind the scenes, which will do an @@ -810,14 +825,15 @@ static void test_reset_preserves_id_regs(struct kvm_v= cpu *vcpu) aarch64_vcpu_setup(vcpu, NULL); =20 for (int i =3D 0; i < ARRAY_SIZE(test_regs); i++) - test_assert_id_reg_unchanged(vcpu, test_regs[i].reg); - - test_assert_id_reg_unchanged(vcpu, SYS_MPIDR_EL1); - test_assert_id_reg_unchanged(vcpu, SYS_CLIDR_EL1); - test_assert_id_reg_unchanged(vcpu, SYS_CTR_EL0); - 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); + test_assert_id_reg_unchanged(vcpu, test_regs[i].reg, + aarch64_only); + + test_assert_id_reg_unchanged(vcpu, SYS_MPIDR_EL1, aarch64_only); + test_assert_id_reg_unchanged(vcpu, SYS_CLIDR_EL1, aarch64_only); + test_assert_id_reg_unchanged(vcpu, SYS_CTR_EL0, aarch64_only); + test_assert_id_reg_unchanged(vcpu, SYS_MIDR_EL1, aarch64_only); + test_assert_id_reg_unchanged(vcpu, SYS_REVIDR_EL1, aarch64_only); + test_assert_id_reg_unchanged(vcpu, SYS_AIDR_EL1, aarch64_only); } =20 int main(void) @@ -859,9 +875,9 @@ int main(void) test_user_set_mpam_reg(vcpu); test_user_set_mte_reg(vcpu); =20 - test_guest_reg_read(vcpu); + test_guest_reg_read(vcpu, aarch64_only); =20 - test_reset_preserves_id_regs(vcpu); + test_reset_preserves_id_regs(vcpu, aarch64_only); =20 kvm_vm_free(vm); =20 --=20 2.47.3