From patchwork Fri Jan 20 22:46:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 645099 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 20683C54EAA for ; Fri, 20 Jan 2023 22:50:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230283AbjATWuK (ORCPT ); Fri, 20 Jan 2023 17:50:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230228AbjATWuJ (ORCPT ); Fri, 20 Jan 2023 17:50:09 -0500 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C359C4DBDF; Fri, 20 Jan 2023 14:49:26 -0800 (PST) Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30KLvekf003343; Fri, 20 Jan 2023 22:48:13 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=w6/aHGaEUJiqoCCNWVVmdNmnpXulOdKevHNVnLS9tfw=; b=hMLgkUDpPUW2CE6uo1tfIsnKGboCUqJpscYvRG5uUbLY2GjdFz035TJpdZWFbyKnALUW f5W6N3BsRhzaPZH6vcAx8o4SsrE280Luobmll+d60qSp8w2l0lk0AGmQzMqRZLG/F8eP 8fXMpd4MgvJVCsKJcHKy384Tx6+TYPzeA/91yU2elqcFo/+C0BBirCSRqBF3jgifKWwy Jt4Y50GYPqBo5AntJyDsajwxIcf5R+buOxEZNLFvZtOCZ9RSiDNC+8CSF8I1g2SB16V9 WtuLtD6x9Q9vOdfSrVK9jYQWhmEnd2s37REYt/bwrhvLSZGLo+nSW7rpI4di0EOeviWL yg== Received: from nasanppmta01.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3n7593uqyw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 20 Jan 2023 22:48:13 +0000 Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 30KMmC59005805 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 20 Jan 2023 22:48:12 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 15.2.986.36; Fri, 20 Jan 2023 14:48:11 -0800 From: Elliot Berman To: Bjorn Andersson , Alex Elder , Elliot Berman , Murali Nalajala , Jonathan Corbet CC: Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Prakruthi Deepak Heragu , Dmitry Baryshkov , Arnd Bergmann , "Greg Kroah-Hartman" , Rob Herring , Krzysztof Kozlowski , Bagas Sanjaya , Catalin Marinas , "Will Deacon" , Marc Zyngier , Jassi Brar , Sudeep Holla , , , , , Subject: [PATCH v9 27/27] virt: gunyah: Add ioeventfd Date: Fri, 20 Jan 2023 14:46:26 -0800 Message-ID: <20230120224627.4053418-28-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230120224627.4053418-1-quic_eberman@quicinc.com> References: <20230120224627.4053418-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) 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: 6VKb8RmDFqQGIsBLbynaHrsPWYv04-50 X-Proofpoint-ORIG-GUID: 6VKb8RmDFqQGIsBLbynaHrsPWYv04-50 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-20_11,2023-01-20_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 mlxscore=0 adultscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301200218 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Allow userspace to attach an ioeventfd to an mmio address within the guest. Co-developed-by: Prakruthi Deepak Heragu Signed-off-by: Prakruthi Deepak Heragu Signed-off-by: Elliot Berman --- Documentation/virt/gunyah/vm-manager.rst | 21 +++++ drivers/virt/gunyah/Kconfig | 9 ++ drivers/virt/gunyah/Makefile | 1 + drivers/virt/gunyah/gunyah_ioeventfd.c | 109 +++++++++++++++++++++++ include/uapi/linux/gunyah.h | 10 +++ 5 files changed, 150 insertions(+) create mode 100644 drivers/virt/gunyah/gunyah_ioeventfd.c diff --git a/Documentation/virt/gunyah/vm-manager.rst b/Documentation/virt/gunyah/vm-manager.rst index b6cf8db826b8..19ec859a7912 100644 --- a/Documentation/virt/gunyah/vm-manager.rst +++ b/Documentation/virt/gunyah/vm-manager.rst @@ -164,3 +164,24 @@ the irqfd.label. GH_IRQFD_LEVEL configures the corresponding doorbell to behave like a level triggered interrupt. + +Type: "ioeventfd" +^^^^^^^^^^^^^^^^^ + +:: + + struct gh_fn_ioeventfd_arg { + __u64 datamatch; + __u64 addr; /* legal mmio address */ + __u32 len; /* 1, 2, 4, or 8 bytes */ + __s32 fd; + #define GH_IOEVENTFD_DATAMATCH (1UL << 0) + __u32 flags; + }; + +Attaches an ioeventfd to a legal mmio address within the guest. A guest write +in the registered address will signal the provided event instead of triggering +an exit on the GH_VCPU_RUN ioctl. + +If datamatch flag is set, the event will be signaled only if the written value +to the registered address is equal to datamatch in struct gh_fn_ioeventfd_arg. diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig index 2cde24d429d1..bd8e31184962 100644 --- a/drivers/virt/gunyah/Kconfig +++ b/drivers/virt/gunyah/Kconfig @@ -35,3 +35,12 @@ config GUNYAH_IRQFD on Gunyah virtual machine. Say Y/M here if unsure and you want to support Gunyah VMMs. + +config GUNYAH_IOEVENTFD + tristate "Gunyah ioeventfd interface" + depends on GUNYAH + help + Enable kernel support for creating ioeventfds which can alert userspace + when a Gunyah virtual machine accesses a memory address. + + Say Y/M here if unsure and you want to support Gunyah VMMs. diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile index 6cf756bfa3c2..7347b1470491 100644 --- a/drivers/virt/gunyah/Makefile +++ b/drivers/virt/gunyah/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o obj-$(CONFIG_GUNYAH_VCPU) += gunyah_vcpu.o obj-$(CONFIG_GUNYAH_IRQFD) += gunyah_irqfd.o +obj-$(CONFIG_GUNYAH_IOEVENTFD) += gunyah_ioeventfd.o diff --git a/drivers/virt/gunyah/gunyah_ioeventfd.c b/drivers/virt/gunyah/gunyah_ioeventfd.c new file mode 100644 index 000000000000..c16a6725fe7e --- /dev/null +++ b/drivers/virt/gunyah/gunyah_ioeventfd.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +struct gunyah_ioeventfd { + struct gunyah_vm_function *f; + struct gunyah_vm_io_handler io_handler; + + struct eventfd_ctx *ctx; +}; + +static int gh_write_ioeventfd(struct gunyah_vm_io_handler *io_dev, u64 addr, u32 len, u64 data) +{ + struct gunyah_ioeventfd *iofd = container_of(io_dev, struct gunyah_ioeventfd, io_handler); + + eventfd_signal(iofd->ctx, 1); + return 0; +} + +static struct gunyah_vm_io_handler_ops io_ops = { + .write = gh_write_ioeventfd, +}; + +static long gunyah_ioeventfd_bind(struct gunyah_vm_function *f) +{ + struct eventfd_ctx *ctx = NULL; + struct gunyah_ioeventfd *iofd; + const struct gh_fn_ioeventfd_arg *args = &f->fn.ioeventfd; + int ret; + + /* must be natural-word sized, or 0 to ignore length */ + switch (args->len) { + case 0: + case 1: + case 2: + case 4: + case 8: + break; + default: + return -EINVAL; + } + + /* check for range overflow */ + if (args->addr + args->len < args->addr) + return -EINVAL; + + /* ioeventfd with no length can't be combined with DATAMATCH */ + if (!args->len && (args->flags & GH_IOEVENTFD_DATAMATCH)) + return -EINVAL; + + ctx = eventfd_ctx_fdget(args->fd); + if (IS_ERR(ctx)) + return PTR_ERR(ctx); + + iofd = kzalloc(sizeof(*iofd), GFP_KERNEL); + if (!iofd) { + ret = -ENOMEM; + goto err_eventfd; + } + + f->data = iofd; + iofd->f = f; + + iofd->ctx = ctx; + + if (args->flags & GH_IOEVENTFD_DATAMATCH) { + iofd->io_handler.datamatch = true; + iofd->io_handler.len = args->len; + iofd->io_handler.data = args->datamatch; + } + iofd->io_handler.addr = args->addr; + iofd->io_handler.ops = &io_ops; + + ret = gh_vm_mgr_add_io_handler(f->ghvm, &iofd->io_handler); + if (ret) + goto err_io_dev_add; + + return 0; + +err_io_dev_add: + kfree(iofd); +err_eventfd: + eventfd_ctx_put(ctx); + return ret; +} + +static void gunyah_ioeventfd_release(struct gunyah_vm_function *f) +{ + struct gunyah_ioeventfd *iofd = f->data; + + eventfd_ctx_put(iofd->ctx); + gh_vm_mgr_remove_io_handler(iofd->f->ghvm, &iofd->io_handler); + kfree(iofd); +} + +DECLARE_GUNYAH_VM_FUNCTION_INIT(ioeventfd, gunyah_ioeventfd_bind, gunyah_ioeventfd_release); +MODULE_DESCRIPTION("Gunyah ioeventfds"); +MODULE_LICENSE("GPL"); diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h index a947f0317ca9..3cc387f0831a 100644 --- a/include/uapi/linux/gunyah.h +++ b/include/uapi/linux/gunyah.h @@ -65,11 +65,21 @@ struct gh_fn_irqfd_arg { __u32 flags; }; +struct gh_fn_ioeventfd_arg { + __u64 datamatch; + __u64 addr; /* legal mmio address */ + __u32 len; /* 1, 2, 4, or 8 bytes; or 0 to ignore length */ + __s32 fd; +#define GH_IOEVENTFD_DATAMATCH (1UL << 0) + __u32 flags; +}; + struct gh_vm_function { char name[GUNYAH_FUNCTION_NAME_SIZE]; union { struct gh_fn_vcpu_arg vcpu; struct gh_fn_irqfd_arg irqfd; + struct gh_fn_ioeventfd_arg ioeventfd; char data[GUNYAH_FUNCTION_MAX_ARG_SIZE]; }; };