From nobody Mon Oct 6 11:53:56 2025 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 D1ECA2E0919; Mon, 21 Jul 2025 15:51:46 +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=1753113107; cv=none; b=M4tJVmMM5QV3rnebWzFKHAFIYZfYz7NzXG880VFhkW0f67uFjjWcu38CYgQK+O1zq2AjqFhz/i63FsHruEVkfhY4RHmgFXrNAkqh1vRQuKiupFH49eO+1zgay8uR/NeiLjQ3RQGZSQtXhihNy5LtVHUroNm+XR5/843kfs7on7o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753113107; c=relaxed/simple; bh=VorkCIfYnj7vmwv7ZzNhcKzHZkJ7O3RYK53j5I6L8r8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=OrTjUuAG+uo+AIxtl005UleBwzm7/lyHqVCDC1+f87Gq+WhW1menbEvmE+oVAq8KY4guhawJtOiL3OvUKqNZyZc0nUZz71hz2TXK2n2t+y7TqIeLpuQacTjzdJ5eufY5pVcHuGbRgorlG3Zj3jlYCD0o7VZWODAH2yarVsx6KZo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NdejrZHv; 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="NdejrZHv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6982CC4CEED; Mon, 21 Jul 2025 15:51:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753113106; bh=VorkCIfYnj7vmwv7ZzNhcKzHZkJ7O3RYK53j5I6L8r8=; h=From:To:Cc:Subject:Date:From; b=NdejrZHvsrvTqLWyUXBZrfvBkmifO+w7JV0xzvU559yvRrMC3HgIkI251X96cBhlX G/7QvuRzgMUnqFP01vKT10CGFvKzLZXyJA09oXTC5BR7PQQFES1WJH3r85MWuPDgf9 C4lsKLiiPzBDFWkuLpQcd8/0Toxye0GMMEWuKfxVYYnJW5f9rH/9GV8sdAoUH7VP3v NxZyPA/ix3TmkT8ZjHONCXlldXtrSXENlzdqce9zWTMVqOkRv2bptD0ECE42Pcy8JC IdsfSrvwl/DnLAfzb/p4S3bZoXp8ONu62hDDRZnsJejcOjLRa50DIorxvi0qV2KZ30 lSmgIv9zJ5c1A== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1udsno-0004Du-F5; Mon, 21 Jul 2025 16:51:44 +0100 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Will Deacon , Mark Rutland , jackabt@amazon.com Subject: [PATCH] KVM: arm64: selftest: Add standalone test checking for KVM's own UUID Date: Mon, 21 Jul 2025 16:51:36 +0100 Message-Id: <20250721155136.892255-1-maz@kernel.org> X-Mailer: git-send-email 2.39.2 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 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com, will@kernel.org, mark.rutland@arm.com, jackabt@amazon.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Content-Type: text/plain; charset="utf-8" Tinkering with UUIDs is a perilious task, and the KVM UUID gets broken at times. In order to spot this early enough, add a selftest that will shout if the expected value isn't found. Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20250721130558.50823-1-jackabt.amazon@gmail= .com Reviewed-by: Sebastian Ott --- tools/testing/selftests/kvm/Makefile.kvm | 1 + tools/testing/selftests/kvm/arm64/kvm-uuid.c | 67 ++++++++++++++++++++ 2 files changed, 68 insertions(+) create mode 100644 tools/testing/selftests/kvm/arm64/kvm-uuid.c diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selft= ests/kvm/Makefile.kvm index ce817a975e50a..e1eb1ba238a2a 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/vgic_irq TEST_GEN_PROGS_arm64 +=3D arm64/vgic_lpi_stress TEST_GEN_PROGS_arm64 +=3D arm64/vpmu_counter_access TEST_GEN_PROGS_arm64 +=3D arm64/no-vgic-v3 +TEST_GEN_PROGS_arm64 +=3D arm64/kvm-uuid TEST_GEN_PROGS_arm64 +=3D access_tracking_perf_test TEST_GEN_PROGS_arm64 +=3D arch_timer TEST_GEN_PROGS_arm64 +=3D coalesced_io_test diff --git a/tools/testing/selftests/kvm/arm64/kvm-uuid.c b/tools/testing/s= elftests/kvm/arm64/kvm-uuid.c new file mode 100644 index 0000000000000..89d9c8b182ae5 --- /dev/null +++ b/tools/testing/selftests/kvm/arm64/kvm-uuid.c @@ -0,0 +1,67 @@ +#include +#include +#include +#include + +#include "processor.h" + +/* + * Do NOT redefine these constants, or try to replace them with some + * "common" version. They are hardcoded here to detect any potential + * breakage happening in the rest of the kernel. + * + * KVM UID value: 28b46fb6-2ec5-11e9-a9ca-4b564d003a74 + */ +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 0xb66fb428U +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 0xe911c52eU +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 0x564bcaa9U +#define ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3 0x743a004dU + +static void guest_code(void) +{ + struct arm_smccc_res res =3D {}; + + smccc_hvc(ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID, 0, 0, 0, 0, 0, 0, 0, &re= s); + + __GUEST_ASSERT(res.a0 !=3D SMCCC_RET_NOT_SUPPORTED, "a0 =3D %lx\n", res.a= 0); + __GUEST_ASSERT(res.a0 =3D=3D ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_0 && + res.a1 =3D=3D ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_1 && + res.a2 =3D=3D ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_2 && + res.a3 =3D=3D ARM_SMCCC_VENDOR_HYP_UID_KVM_REG_3, + "Unexpected KVM-specific UID %lx %lx %lx %lx\n", res.a0, res.a1, = res.a2, res.a3); + GUEST_DONE(); +} + +int main (int argc, char *argv[]) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + struct ucall uc; + bool guest_done =3D false; + + vm =3D vm_create_with_one_vcpu(&vcpu, guest_code); + + while (!guest_done) { + vcpu_run(vcpu); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_SYNC: + break; + case UCALL_DONE: + guest_done =3D true; + break; + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + break; + case UCALL_PRINTF: + printf("%s", uc.buffer); + break; + default: + TEST_FAIL("Unexpected guest exit"); + } + } + + kvm_vm_free(vm); + + return 0; +} --=20 2.39.2