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author | Shuo Liu <shuo.a.liu@intel.com> | 2021-02-07 11:10:27 +0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-09 10:58:18 +0100 |
commit | 666834c47d3b41da550bbcbc709148e5fc14879c (patch) | |
tree | 84f4f08744ae34b152d6cef2a0cdde1ed916334a /drivers/virt/acrn | |
parent | 8a0a87198a584202616868f9c82d9611bb675c90 (diff) | |
download | lwn-666834c47d3b41da550bbcbc709148e5fc14879c.tar.gz lwn-666834c47d3b41da550bbcbc709148e5fc14879c.zip |
virt: acrn: Introduce ACRN HSM basic driver
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>
Diffstat (limited to 'drivers/virt/acrn')
-rw-r--r-- | drivers/virt/acrn/Kconfig | 14 | ||||
-rw-r--r-- | drivers/virt/acrn/Makefile | 3 | ||||
-rw-r--r-- | drivers/virt/acrn/acrn_drv.h | 18 | ||||
-rw-r--r-- | drivers/virt/acrn/hsm.c | 87 |
4 files changed, 122 insertions, 0 deletions
diff --git a/drivers/virt/acrn/Kconfig b/drivers/virt/acrn/Kconfig new file mode 100644 index 000000000000..36c80378c30c --- /dev/null +++ b/drivers/virt/acrn/Kconfig @@ -0,0 +1,14 @@ +# SPDX-License-Identifier: GPL-2.0 +config ACRN_HSM + tristate "ACRN Hypervisor Service Module" + depends on ACRN_GUEST + help + ACRN Hypervisor Service Module (HSM) is a kernel module which + communicates with ACRN userspace through ioctls and talks to + the ACRN Hypervisor through hypercalls. HSM will only run in + a privileged management VM, called Service VM, to manage User + VMs and do I/O emulation. Not required for simply running + under ACRN as a User VM. + + To compile as a module, choose M, the module will be called + acrn. If unsure, say N. diff --git a/drivers/virt/acrn/Makefile b/drivers/virt/acrn/Makefile new file mode 100644 index 000000000000..6920ed798aaf --- /dev/null +++ b/drivers/virt/acrn/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_ACRN_HSM) := acrn.o +acrn-y := hsm.o diff --git a/drivers/virt/acrn/acrn_drv.h b/drivers/virt/acrn/acrn_drv.h new file mode 100644 index 000000000000..29eedd696327 --- /dev/null +++ b/drivers/virt/acrn/acrn_drv.h @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ACRN_HSM_DRV_H +#define __ACRN_HSM_DRV_H + +#include <linux/types.h> + +#define ACRN_INVALID_VMID (0xffffU) + +/** + * struct acrn_vm - Properties of ACRN User VM. + * @vmid: User VM ID + */ +struct acrn_vm { + u16 vmid; +}; + +#endif /* __ACRN_HSM_DRV_H */ diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c new file mode 100644 index 000000000000..a8dcb250649d --- /dev/null +++ b/drivers/virt/acrn/hsm.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ACRN Hypervisor Service Module (HSM) + * + * Copyright (C) 2020 Intel Corporation. All rights reserved. + * + * Authors: + * Fengwei Yin <fengwei.yin@intel.com> + * Yakui Zhao <yakui.zhao@intel.com> + */ + +#include <linux/miscdevice.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include <asm/acrn.h> +#include <asm/hypervisor.h> + +#include "acrn_drv.h" + +/* + * When /dev/acrn_hsm is opened, a 'struct acrn_vm' object is created to + * represent a VM instance and continues to be associated with the opened file + * descriptor. All ioctl operations on this file descriptor will be targeted to + * the VM instance. Release of this file descriptor will destroy the object. + */ +static int acrn_dev_open(struct inode *inode, struct file *filp) +{ + struct acrn_vm *vm; + + vm = kzalloc(sizeof(*vm), GFP_KERNEL); + if (!vm) + return -ENOMEM; + + vm->vmid = ACRN_INVALID_VMID; + filp->private_data = vm; + return 0; +} + +static int acrn_dev_release(struct inode *inode, struct file *filp) +{ + struct acrn_vm *vm = filp->private_data; + + kfree(vm); + return 0; +} + +static const struct file_operations acrn_fops = { + .owner = THIS_MODULE, + .open = acrn_dev_open, + .release = acrn_dev_release, +}; + +static struct miscdevice acrn_dev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "acrn_hsm", + .fops = &acrn_fops, +}; + +static int __init hsm_init(void) +{ + int ret; + + if (x86_hyper_type != X86_HYPER_ACRN) + return -ENODEV; + + if (!(cpuid_eax(ACRN_CPUID_FEATURES) & ACRN_FEATURE_PRIVILEGED_VM)) + return -EPERM; + + ret = misc_register(&acrn_dev); + if (ret) + pr_err("Create misc dev failed!\n"); + + return ret; +} + +static void __exit hsm_exit(void) +{ + misc_deregister(&acrn_dev); +} +module_init(hsm_init); +module_exit(hsm_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ACRN Hypervisor Service Module (HSM)"); |