From nobody Fri Apr 3 04:38:50 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CD1AC214A8B; Wed, 25 Mar 2026 00:37:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774399066; cv=none; b=deSVvzFgsV6cQNPzCp0AtVja8dbGFzJ93AP/EIYBdEvnIn8TUaQYAL0i5ZfPlxIUd2x9BIxS9EaiA5Q+l9iYZGpK6Izw25nVMnz1j5N6/loeixfI0CjlPc9IFAiYCgmM17jUlEbC4/pJ8XAPXJ8+uRxXu6LhMYBHDWls/uns0vk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774399066; c=relaxed/simple; bh=r2NqJqtxMzptltCE+GymYSs9aCU3DPcd19M/MmyWskE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TWUrItHjWNxDhpJle/5qB6bKzPZCDNbh3ld68DCafOk7ebev8LVFdWhf2f2HqFUlZI9LM/oWyvRQhQKk0xaEb7A97LCHcRhzh7dma3xrEb34eIkBHcwiJuXFzlTEFeBsx7sn5LuL7/2LHlSRcIlNIhixLsfahDbrU3TcVNy0VPY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=IXGXS+yk; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="IXGXS+yk" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6C82A1C0A; Tue, 24 Mar 2026 17:37:38 -0700 (PDT) Received: from workstation-e142269.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 380233FB90; Tue, 24 Mar 2026 17:37:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1774399064; bh=r2NqJqtxMzptltCE+GymYSs9aCU3DPcd19M/MmyWskE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IXGXS+ykBFLyiBA3As/Eqt2T1yCIqKBQCggrqBgjYnb6sfzOlJ9y3rqp5FIAOB6gb jIdZXjLGF6flg57RCzDbANEG7hahqs4hSAhbGwjg0A+O6xyXZoiK0O4TdYPhw1JiSh SsEzrofyk+2laz8DFG/BqAOD8i45Vwh7xOU+pBNY= From: Wei-Lin Chang To: kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Cc: Paolo Bonzini , Shuah Khan , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon Subject: [PATCH 2/3] KVM: arm64: sefltests: Add basic NV selftest Date: Wed, 25 Mar 2026 00:36:19 +0000 Message-ID: <20260325003620.2214766-3-weilin.chang@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260325003620.2214766-1-weilin.chang@arm.com> References: <20260325003620.2214766-1-weilin.chang@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a simple NV selftest that uses the NV library functions to eret from vEL2 to EL1, then call an hvc to jump back to vEL2. Signed-off-by: Wei-Lin Chang --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/arm64/hello_nested.c | 65 +++++++++++++++++++ 2 files changed, 66 insertions(+) create mode 100644 tools/testing/selftests/kvm/arm64/hello_nested.c diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selft= ests/kvm/Makefile.kvm index 5e681e8e0cd7..d7499609cd0c 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -167,6 +167,7 @@ TEST_GEN_PROGS_arm64 +=3D arm64/arch_timer_edge_cases TEST_GEN_PROGS_arm64 +=3D arm64/at TEST_GEN_PROGS_arm64 +=3D arm64/debug-exceptions TEST_GEN_PROGS_arm64 +=3D arm64/hello_el2 +TEST_GEN_PROGS_arm64 +=3D arm64/hello_nested TEST_GEN_PROGS_arm64 +=3D arm64/host_sve TEST_GEN_PROGS_arm64 +=3D arm64/hypercalls TEST_GEN_PROGS_arm64 +=3D arm64/external_aborts diff --git a/tools/testing/selftests/kvm/arm64/hello_nested.c b/tools/testi= ng/selftests/kvm/arm64/hello_nested.c new file mode 100644 index 000000000000..16c600539810 --- /dev/null +++ b/tools/testing/selftests/kvm/arm64/hello_nested.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * hello_nested - Go from vEL2 to EL1 then back + */ +#include "kvm_util.h" +#include "nested.h" +#include "processor.h" +#include "test_util.h" +#include "ucall.h" + +static void l2_guest_code(void) +{ + /* nothing */ +} + +static void guest_code(void) +{ + GUEST_ASSERT_EQ(get_current_el(), 2); + GUEST_PRINTF("vEL2 entry\n"); + run_l2(); + GUEST_DONE(); +} + +int main(void) +{ + struct kvm_vcpu_init init; + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + struct ucall uc; + + TEST_REQUIRE(kvm_check_cap(KVM_CAP_ARM_EL2)); + vm =3D vm_create(1); + + kvm_get_default_vcpu_target(vm, &init); + init.features[0] |=3D BIT(KVM_ARM_VCPU_HAS_EL2); + vcpu =3D aarch64_vcpu_add(vm, 0, &init, guest_code); + kvm_arch_vm_finalize_vcpus(vm); + + prepare_l2_stack(vm, vcpu); + prepare_hyp_state(vm, vcpu); + prepare_eret_destination(vm, vcpu, l2_guest_code); + prepare_nested_sync_handler(vm, vcpu); + + while (true) { + vcpu_run(vcpu); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_PRINTF: + pr_info("%s", uc.buffer); + break; + case UCALL_DONE: + pr_info("DONE!\n"); + goto end; + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + fallthrough; + default: + TEST_FAIL("Unhandled ucall: %ld\n", uc.cmd); + } + } + +end: + kvm_vm_free(vm); + return 0; +} --=20 2.43.0