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ACRN Hypervisor Service Module (HSM) is a kernel module in Service VM which communicates with ACRN userspace through ioctls and talks to ACRN Hypervisor through hypercalls. Add a basic HSM driver which allows Service VM userspace to communicate with ACRN. The following patches will add more ioctls, guest VM memory mapping caching, I/O request processing, ioeventfd and irqfd into this module. HSM exports a char device interface (/dev/acrn_hsm) to userspace. Cc: Dave Hansen <dave.hansen@intel.com> Cc: Zhi Wang <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-6-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ACRN Hypervisor Service Module (HSM)
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*
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* Copyright (C) 2020 Intel Corporation. All rights reserved.
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*
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* Authors:
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* Fengwei Yin <fengwei.yin@intel.com>
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* Yakui Zhao <yakui.zhao@intel.com>
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*/
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#include <linux/miscdevice.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <asm/acrn.h>
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#include <asm/hypervisor.h>
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#include "acrn_drv.h"
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/*
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* When /dev/acrn_hsm is opened, a 'struct acrn_vm' object is created to
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* represent a VM instance and continues to be associated with the opened file
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* descriptor. All ioctl operations on this file descriptor will be targeted to
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* the VM instance. Release of this file descriptor will destroy the object.
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*/
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static int acrn_dev_open(struct inode *inode, struct file *filp)
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{
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struct acrn_vm *vm;
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vm = kzalloc(sizeof(*vm), GFP_KERNEL);
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if (!vm)
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return -ENOMEM;
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vm->vmid = ACRN_INVALID_VMID;
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filp->private_data = vm;
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return 0;
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}
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static int acrn_dev_release(struct inode *inode, struct file *filp)
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{
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struct acrn_vm *vm = filp->private_data;
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kfree(vm);
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return 0;
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}
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static const struct file_operations acrn_fops = {
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.owner = THIS_MODULE,
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.open = acrn_dev_open,
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.release = acrn_dev_release,
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};
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static struct miscdevice acrn_dev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "acrn_hsm",
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.fops = &acrn_fops,
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};
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static int __init hsm_init(void)
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{
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int ret;
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if (x86_hyper_type != X86_HYPER_ACRN)
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return -ENODEV;
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if (!(cpuid_eax(ACRN_CPUID_FEATURES) & ACRN_FEATURE_PRIVILEGED_VM))
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return -EPERM;
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ret = misc_register(&acrn_dev);
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if (ret)
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pr_err("Create misc dev failed!\n");
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return ret;
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}
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static void __exit hsm_exit(void)
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{
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misc_deregister(&acrn_dev);
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}
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module_init(hsm_init);
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module_exit(hsm_exit);
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MODULE_AUTHOR("Intel Corporation");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ACRN Hypervisor Service Module (HSM)");
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