From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CF57C43219 for ; Tue, 28 Sep 2021 18:31:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86993613A9 for ; Tue, 28 Sep 2021 18:31:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242247AbhI1SdC (ORCPT ); Tue, 28 Sep 2021 14:33:02 -0400 Received: from linux.microsoft.com ([13.77.154.182]:50860 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242155AbhI1SdA (ORCPT ); Tue, 28 Sep 2021 14:33:00 -0400 Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id 05C5620B861E; Tue, 28 Sep 2021 11:31:21 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 05C5620B861E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1632853881; bh=oZTfBIvL3KWAqcaa+lqgmUko0hXqiLsO0u/E3y1mF+c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J9G6W6QoBLaB/w8vebGq7m9oDUVai3VTc8T/FZrc1i7AoUVaSpNhDrcHzneqKrMES l4UQoTk8iGGdzW4BIb3s6BoCPcRLTVdhCfUnahScqcsL7aKYT1Ey8hPg4vQrX/o16i hNsu0lilBW2kq/yHiSAN0DVydox1lOfbiKXerlcA= From: Nuno Das Neves To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Cc: virtualization@lists.linux-foundation.org, mikelley@microsoft.com, viremana@linux.microsoft.com, sunilmut@microsoft.com, wei.liu@kernel.org, vkuznets@redhat.com, ligrassi@microsoft.com, kys@microsoft.com, sthemmin@microsoft.com, anbelski@linux.microsoft.com Subject: [PATCH v3 03/19] drivers/hv: minimal mshv module (/dev/mshv/) Date: Tue, 28 Sep 2021 11:30:59 -0700 Message-Id: <1632853875-20261-4-git-send-email-nunodasneves@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1632853875-20261-1-git-send-email-nunodasneves@linux.microsoft.com> References: <1632853875-20261-1-git-send-email-nunodasneves@linux.microsoft.com> Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org Introduce a barebones module file for the mshv API. Introduce CONFIG_HYPERV_VMM_API for controlling compilation of mshv. Co-developed-by: Lillian Grassin-Drake Signed-off-by: Lillian Grassin-Drake Signed-off-by: Nuno Das Neves --- arch/x86/hyperv/Makefile | 1 + drivers/hv/Kconfig | 18 ++++++++++ drivers/hv/Makefile | 3 ++ drivers/hv/mshv_main.c | 77 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 99 insertions(+) create mode 100644 drivers/hv/mshv_main.c diff --git a/arch/x86/hyperv/Makefile b/arch/x86/hyperv/Makefile index 48e2c51464e8..4b5a8a96ba01 100644 --- a/arch/x86/hyperv/Makefile +++ b/arch/x86/hyperv/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_X86_64) += hv_apic.o hv_proc.o ifdef CONFIG_X86_64 obj-$(CONFIG_PARAVIRT_SPINLOCKS) += hv_spinlock.o endif + diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig index 66c794d92391..0fc3fcce3cf7 100644 --- a/drivers/hv/Kconfig +++ b/drivers/hv/Kconfig @@ -27,4 +27,22 @@ config HYPERV_BALLOON help Select this option to enable Hyper-V Balloon driver. +config HYPERV_VMM_API + tristate "Microsoft Hypervisor root partition interfaces: /dev/mshv" + depends on HYPERV + help + Provides access to interfaces for managing guest virtual machines + running under the Microsoft Hypervisor. + + These interfaces will only work when Linux is running as root + partition on the Microsoft Hypervisor. + + The interfaces are provided via a device named /dev/mshv. + + To compile this as a module, choose M here. + The module is named mshv. + + If unsure, say N. + + endmenu diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile index 94daf8240c95..84e7fe2022a0 100644 --- a/drivers/hv/Makefile +++ b/drivers/hv/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_HYPERV) += hv_vmbus.o obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o +obj-$(CONFIG_HYPERV_VMM_API) += mshv.o CFLAGS_hv_trace.o = -I$(src) CFLAGS_hv_balloon.o = -I$(src) @@ -11,3 +12,5 @@ hv_vmbus-y := vmbus_drv.o \ channel_mgmt.o ring_buffer.o hv_trace.o hv_vmbus-$(CONFIG_HYPERV_TESTING) += hv_debugfs.o hv_utils-y := hv_util.o hv_kvp.o hv_snapshot.o hv_fcopy.o hv_utils_transport.o + +mshv-y += mshv_main.o diff --git a/drivers/hv/mshv_main.c b/drivers/hv/mshv_main.c new file mode 100644 index 000000000000..e44adf91f660 --- /dev/null +++ b/drivers/hv/mshv_main.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2020, Microsoft Corporation. + * + * Authors: + * Nuno Das Neves + * Lillian Grassin-Drake + */ + +#include +#include +#include +#include + +MODULE_AUTHOR("Microsoft"); +MODULE_LICENSE("GPL"); + +static int mshv_dev_open(struct inode *inode, struct file *filp); +static int mshv_dev_release(struct inode *inode, struct file *filp); +static long mshv_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg); + +static const struct file_operations mshv_dev_fops = { + .owner = THIS_MODULE, + .open = mshv_dev_open, + .release = mshv_dev_release, + .unlocked_ioctl = mshv_dev_ioctl, + .llseek = noop_llseek, +}; + +static struct miscdevice mshv_dev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "mshv", + .fops = &mshv_dev_fops, + .mode = 0600, +}; + +static long +mshv_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) +{ + return -ENOTTY; +} + +static int +mshv_dev_open(struct inode *inode, struct file *filp) +{ + return 0; +} + +static int +mshv_dev_release(struct inode *inode, struct file *filp) +{ + return 0; +} + +static int +__init mshv_init(void) +{ + int ret; + + if (!hv_is_hyperv_initialized()) + return -ENODEV; + + ret = misc_register(&mshv_dev); + if (ret) + pr_err("%s: misc device register failed\n", __func__); + + return ret; +} + +static void +__exit mshv_exit(void) +{ + misc_deregister(&mshv_dev); +} + +module_init(mshv_init); +module_exit(mshv_exit); -- 2.23.4