From patchwork Mon Apr 24 23:15:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 676976 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 42E9BC77B76 for ; Mon, 24 Apr 2023 23:18:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233338AbjDXXSY (ORCPT ); Mon, 24 Apr 2023 19:18:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232851AbjDXXSB (ORCPT ); Mon, 24 Apr 2023 19:18:01 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2BD50B465; Mon, 24 Apr 2023 16:17:10 -0700 (PDT) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 33ONB2MB026706; Mon, 24 Apr 2023 23:16:53 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=kr57aaAKJdmUa2qdJ5GfalbiCqXquEdT5NF7O6emnX8=; b=Y++XVDD/bPCtITaPAd2gT0g/xP/JrKxAlUlh3G4DpG2KwBLiOQfYdW3L6JiYVqklCxA4 L0cHcRG9p2PZKZVZ+cdPHxMayKquV1giWzLSgIQGti4LSpgRHFhsn7DqmYPP7MgWH+fY sJvDRciZBYtQrkGMATbfrHferFNjgDirONNFf2mTN80hafr3NgMl5sULNqc+ZekHlBWZ m+r4+PAY7bLw+m4XaGF+bwx3fSOTIoAcdunqhzX0AoCoecZ8n5LCwjV0UBvV5kbJVEwC 3+5t+Z2ciB9N18sHrlcOKXVISYjXQXqldplHQPQFIkCC5Fs46SrKVADafp9w34fgxhFX Fw== Received: from nasanppmta05.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3q5r0uskn0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 24 Apr 2023 23:16:52 +0000 Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 33ONGplm030015 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 24 Apr 2023 23:16:51 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 15.2.986.42; Mon, 24 Apr 2023 16:16:51 -0700 From: Elliot Berman To: Alex Elder , Srinivas Kandagatla , Elliot Berman , Prakruthi Deepak Heragu , Jonathan Corbet CC: Murali Nalajala , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Dmitry Baryshkov , Bjorn Andersson , "Konrad Dybcio" , Arnd Bergmann , "Greg Kroah-Hartman" , Rob Herring , Krzysztof Kozlowski , Bagas Sanjaya , Will Deacon , Andy Gross , Catalin Marinas , Jassi Brar , , , , , Subject: [PATCH v12 16/25] docs: gunyah: Document Gunyah VM Manager Date: Mon, 24 Apr 2023 16:15:49 -0700 Message-ID: <20230424231558.70911-17-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230424231558.70911-1-quic_eberman@quicinc.com> References: <20230424231558.70911-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) 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: _gdwmxTz5ku5zHNRItg2-o0wYPZ8_GyM X-Proofpoint-ORIG-GUID: _gdwmxTz5ku5zHNRItg2-o0wYPZ8_GyM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-24_11,2023-04-21_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 mlxlogscore=999 phishscore=0 mlxscore=0 spamscore=0 priorityscore=1501 malwarescore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304240211 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Document the ioctls and usage of Gunyah VM Manager driver. Signed-off-by: Elliot Berman --- Documentation/virt/gunyah/index.rst | 1 + Documentation/virt/gunyah/vm-manager.rst | 82 ++++++++++++++++++++++++ 2 files changed, 83 insertions(+) create mode 100644 Documentation/virt/gunyah/vm-manager.rst diff --git a/Documentation/virt/gunyah/index.rst b/Documentation/virt/gunyah/index.rst index 74aa345e0a14..7058249825b1 100644 --- a/Documentation/virt/gunyah/index.rst +++ b/Documentation/virt/gunyah/index.rst @@ -7,6 +7,7 @@ Gunyah Hypervisor .. toctree:: :maxdepth: 1 + vm-manager message-queue Gunyah is a Type-1 hypervisor which is independent of any OS kernel, and runs in diff --git a/Documentation/virt/gunyah/vm-manager.rst b/Documentation/virt/gunyah/vm-manager.rst new file mode 100644 index 000000000000..50d8ae7fabcd --- /dev/null +++ b/Documentation/virt/gunyah/vm-manager.rst @@ -0,0 +1,82 @@ +.. SPDX-License-Identifier: GPL-2.0 + +======================= +Virtual Machine Manager +======================= + +The Gunyah Virtual Machine Manager is a Linux driver to support launching +virtual machines using Gunyah. It presently supports launching non-proxy +scheduled Linux-like virtual machines. + +Except for some basic information about the location of initial binaries, +most of the configuration about a Gunyah virtual machine is described in the +VM's devicetree. The devicetree is generated by userspace. Interacting with the +virtual machine is still done via the kernel and VM configuration requires some +of the corresponding functionality to be set up in the kernel. For instance, +sharing userspace memory with a VM is done via the `GH_VM_SET_USER_MEM_REGION`_ +ioctl. The VM itself is configured to use the memory region via the +devicetree. + +Sample Userspace VMM +==================== + +A sample userspace VMM is included in samples/gunyah/ along with a minimal +devicetree that can be used to launch a VM. To build this sample, enable +CONFIG_SAMPLE_GUNYAH. + +IOCTLs and userspace VMM flows +============================== + +The kernel exposes a char device interface at /dev/gunyah. + +To create a VM, use the `GH_CREATE_VM`_ ioctl. A successful call will return a +"Gunyah VM" file descriptor. + +/dev/gunyah API Descriptions +---------------------------- + +GH_CREATE_VM +~~~~~~~~~~~~ + +Creates a Gunyah VM. The argument is reserved for future use and must be 0. + +Gunyah VM API Descriptions +-------------------------- + +GH_VM_SET_USER_MEM_REGION +~~~~~~~~~~~~~~~~~~~~~~~~~ + +This ioctl allows the user to create or delete a memory parcel for a guest +virtual machine. Each memory region is uniquely identified by a label; +attempting to create two regions with the same label is not allowed. Labels are +unique per virtual machine. + +While VMM is guest-agnostic and allows runtime addition of memory regions, +Linux guest virtual machines do not support accepting memory regions at runtime. +Thus, memory regions should be provided before starting the VM and the VM must +be configured to accept these at boot-up. + +The guest physical address is used by Linux kernel to check that the requested +user regions do not overlap and to help find the corresponding memory region +for calls like `GH_VM_SET_DTB_CONFIG`_. It must be page aligned. + +To add a memory region, call `GH_VM_SET_USER_MEM_REGION`_ with fields set as +described above. + +.. kernel-doc:: include/uapi/linux/gunyah.h + :identifiers: gh_userspace_memory_region gh_mem_flags + +GH_VM_SET_DTB_CONFIG +~~~~~~~~~~~~~~~~~~~~ + +This ioctl sets the location of the VM's devicetree blob and is used by Gunyah +Resource Manager to allocate resources. The guest physical memory should be part +of the primary memory parcel provided to the VM prior to GH_VM_START. + +.. kernel-doc:: include/uapi/linux/gunyah.h + :identifiers: gh_vm_dtb_config + +GH_VM_START +~~~~~~~~~~~ + +This ioctl starts the VM.