From patchwork Wed Sep 28 19:56:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 610152 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D699DC04A95 for ; Wed, 28 Sep 2022 19:58:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234480AbiI1T6J (ORCPT ); Wed, 28 Sep 2022 15:58:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234478AbiI1T5o (ORCPT ); Wed, 28 Sep 2022 15:57:44 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2228558C6; Wed, 28 Sep 2022 12:57:42 -0700 (PDT) Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 28SD604K022266; Wed, 28 Sep 2022 19:57:29 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=Mc1zaz/62brz07fbZELnYixjwK3DmS2fp3SNZl9ly/Y=; b=l/tPT660gQswPBCR4UL8oqsr7DWXDpaFYDYkeYwoKvQVZrWq7fWPPWXZT4Lo4hbVmYQz Bl24bZCFrKf0/wzR8Om5NuFQ6LKK/o9gGhdb7nHZl/4VCveBJ1UbGHBQyXiYZcCLVe0e NrGxjJ/8ToGlFcbMz3c4agI+Ni8Qusqw6All9v2dk1qsq4AWT9OHywaSIQMthVwUjf51 5Xx6teXWQWnw/TzmcVln6KFN6i0Ohp5h2r7hSxfgpK5YdHVgYxkpw6mQ3GcWI7v7dbPF edZH/1whEu0Z/6UaTvqxktVB1evsK3aGyvuhYwfc6DB08kSldhivwgsiGq/+3UekBHwE 4w== Received: from nasanppmta01.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3jvpuv98vq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 28 Sep 2022 19:57:29 +0000 Received: from nasanex01b.na.qualcomm.com (corens_vlan604_snip.qualcomm.com [10.53.140.1]) by NASANPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 28SJvSL4022185 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 28 Sep 2022 19:57:28 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Wed, 28 Sep 2022 12:57:27 -0700 From: Elliot Berman To: Bjorn Andersson CC: Elliot Berman , Murali Nalajala , Trilok Soni , "Srivatsa Vaddagiri" , Carl van Schaik , Andy Gross , Dmitry Baryshkov , Jassi Brar , , Mark Rutland , Lorenzo Pieralisi , Sudeep Holla , Marc Zyngier , Rob Herring , Krzysztof Kozlowski , Jonathan Corbet , "Will Deacon" , Catalin Marinas , "Arnd Bergmann" , Greg Kroah-Hartman , , , , Subject: [PATCH v4 06/14] virt: gunyah: Add sysfs nodes Date: Wed, 28 Sep 2022 12:56:25 -0700 Message-ID: <20220928195633.2348848-7-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220928195633.2348848-1-quic_eberman@quicinc.com> References: <20220928195633.2348848-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: sBgHLd-ejEHFdoHMqrU1Drf8mlhxZz0P X-Proofpoint-ORIG-GUID: sBgHLd-ejEHFdoHMqrU1Drf8mlhxZz0P X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-28_09,2022-09-28_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 impostorscore=0 phishscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 malwarescore=0 clxscore=1015 priorityscore=1501 mlxscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2209280119 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add /sys/hypervisor support when detecting that Linux is running in a Gunyah environment. Export the version of Gunyah which is reported via the hyp_identify hypercall. Signed-off-by: Elliot Berman --- .../ABI/testing/sysfs-hypervisor-gunyah | 15 ++++ MAINTAINERS | 1 + drivers/virt/Makefile | 1 + drivers/virt/gunyah/Makefile | 2 + drivers/virt/gunyah/sysfs.c | 71 +++++++++++++++++++ 5 files changed, 90 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-hypervisor-gunyah create mode 100644 drivers/virt/gunyah/Makefile create mode 100644 drivers/virt/gunyah/sysfs.c diff --git a/Documentation/ABI/testing/sysfs-hypervisor-gunyah b/Documentation/ABI/testing/sysfs-hypervisor-gunyah new file mode 100644 index 000000000000..7d74e74e9edd --- /dev/null +++ b/Documentation/ABI/testing/sysfs-hypervisor-gunyah @@ -0,0 +1,15 @@ +What: /sys/hypervisor/gunyah/api +Date: October 2022 +KernelVersion: 6.1 +Contact: linux-arm-msm@vger.kernel.org +Description: If running under Gunyah: + The Gunyah API version. + +What: /sys/hypervisor/gunyah/variant +Date: October 2022 +KernelVersion: 6.1 +Contact: linux-arm-msm@vger.kernel.org +Description: If running under Gunyah: + Reports the build variant of Gunyah: + The open source build of Gunyah will report "81". + The Qualcomm build of Gunyah will report "72". diff --git a/MAINTAINERS b/MAINTAINERS index feafac12db35..a26e67ef36b4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8885,6 +8885,7 @@ M: Elliot Berman M: Murali Nalajala L: linux-arm-msm@vger.kernel.org S: Supported +F: Documentation/ABI/testing/sysfs-hypervisor-gunyah F: Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml F: Documentation/virt/gunyah/ F: arch/arm64/gunyah/ diff --git a/drivers/virt/Makefile b/drivers/virt/Makefile index 093674e05c40..10b87f934730 100644 --- a/drivers/virt/Makefile +++ b/drivers/virt/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_NITRO_ENCLAVES) += nitro_enclaves/ obj-$(CONFIG_ACRN_HSM) += acrn/ obj-$(CONFIG_EFI_SECRET) += coco/efi_secret/ obj-$(CONFIG_SEV_GUEST) += coco/sev-guest/ +obj-$(CONFIG_GUNYAH) += gunyah/ diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile new file mode 100644 index 000000000000..e15f16c17142 --- /dev/null +++ b/drivers/virt/gunyah/Makefile @@ -0,0 +1,2 @@ +gunyah-y += sysfs.o +obj-$(CONFIG_GUNYAH) += gunyah.o diff --git a/drivers/virt/gunyah/sysfs.c b/drivers/virt/gunyah/sysfs.c new file mode 100644 index 000000000000..ec11510cbece --- /dev/null +++ b/drivers/virt/gunyah/sysfs.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) "gunyah: " fmt + +#include +#include +#include +#include +#include + +static struct gh_hypercall_hyp_identify_resp gunyah_api; + +static ssize_t api_show(struct kobject *kobj, struct kobj_attribute *attr, char *buffer) +{ + return sysfs_emit(buffer, "%d\n", (int)GH_API_INFO_API_VERSION(gunyah_api.api_info)); +} +static struct kobj_attribute api_attr = __ATTR_RO(api); + +static ssize_t variant_show(struct kobject *kobj, struct kobj_attribute *attr, char *buffer) +{ + return sysfs_emit(buffer, "%d\n", (int)GH_API_INFO_VARIANT(gunyah_api.api_info)); +} +static struct kobj_attribute variant_attr = __ATTR_RO(variant); + +static struct attribute *gunyah_attrs[] = { + &api_attr.attr, + &variant_attr.attr, + NULL +}; + +static const struct attribute_group gunyah_group = { + .name = "gunyah", + .attrs = gunyah_attrs, +}; + +static int __init gunyah_init(void) +{ + u32 uid[4]; + + gh_hypercall_get_uid(uid); + + if (!(gh_uid_matches(GUNYAH, uid) || gh_uid_matches(QC_HYP, uid))) + return 0; + + gh_hypercall_hyp_identify(&gunyah_api); + + if (GH_API_INFO_API_VERSION(gunyah_api.api_info) != 1) { + pr_warn("Unrecognized gunyah version: %llu. Currently supported: 1\n", + GH_API_INFO_API_VERSION(gunyah_api.api_info)); + return 0; + } + + pr_notice("Running under Gunyah hypervisor %llx/v%lld\n", + GH_API_INFO_VARIANT(gunyah_api.api_info), + GH_API_INFO_API_VERSION(gunyah_api.api_info)); + + return sysfs_create_group(hypervisor_kobj, &gunyah_group); +} +module_init(gunyah_init); + +static void __exit gunyah_exit(void) +{ + sysfs_remove_group(hypervisor_kobj, &gunyah_group); +} +module_exit(gunyah_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Gunyah Hypervisor Driver");