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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ACRN_HSM: Virtual Machine management
4 *
5 * Copyright (C) 2020 Intel Corporation. All rights reserved.
6 *
7 * Authors:
8 * Jason Chen CJ <[email protected]>
9 * Yakui Zhao <[email protected]>
10 */
11#include <linux/io.h>
12#include <linux/mm.h>
13#include <linux/slab.h>
14
15#include "acrn_drv.h"
16
17/* List of VMs */
18LIST_HEAD(acrn_vm_list);
19/*
20 * acrn_vm_list is read in a worker thread which dispatch I/O requests and
21 * is wrote in VM creation ioctl. Use the rwlock mechanism to protect it.
22 */
23DEFINE_RWLOCK(acrn_vm_list_lock);
24
25struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
26 struct acrn_vm_creation *vm_param)
27{
28 int ret;
29
30 ret = hcall_create_vm(virt_to_phys(vm_param));
31 if (ret < 0 || vm_param->vmid == ACRN_INVALID_VMID) {
32 dev_err(acrn_dev.this_device,
33 "Failed to create VM! Error: %d\n", ret);
34 return NULL;
35 }
36
37 mutex_init(&vm->regions_mapping_lock);
38 INIT_LIST_HEAD(&vm->ioreq_clients);
39 spin_lock_init(&vm->ioreq_clients_lock);
40 vm->vmid = vm_param->vmid;
41 vm->vcpu_num = vm_param->vcpu_num;
42
43 if (acrn_ioreq_init(vm, vm_param->ioreq_buf) < 0) {
44 hcall_destroy_vm(vm_param->vmid);
45 vm->vmid = ACRN_INVALID_VMID;
46 return NULL;
47 }
48
49 write_lock_bh(&acrn_vm_list_lock);
50 list_add(&vm->list, &acrn_vm_list);
51 write_unlock_bh(&acrn_vm_list_lock);
52
53 acrn_ioeventfd_init(vm);
54 acrn_irqfd_init(vm);
55 dev_dbg(acrn_dev.this_device, "VM %u created.\n", vm->vmid);
56 return vm;
57}
58
59int acrn_vm_destroy(struct acrn_vm *vm)
60{
61 int ret;
62
63 if (vm->vmid == ACRN_INVALID_VMID ||
64 test_and_set_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags))
65 return 0;
66
67 ret = hcall_destroy_vm(vm->vmid);
68 if (ret < 0) {
69 dev_err(acrn_dev.this_device,
70 "Failed to destroy VM %u\n", vm->vmid);
71 clear_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags);
72 return ret;
73 }
74
75 /* Remove from global VM list */
76 write_lock_bh(&acrn_vm_list_lock);
77 list_del_init(&vm->list);
78 write_unlock_bh(&acrn_vm_list_lock);
79
80 acrn_ioeventfd_deinit(vm);
81 acrn_irqfd_deinit(vm);
82 acrn_ioreq_deinit(vm);
83
84 if (vm->monitor_page) {
85 put_page(vm->monitor_page);
86 vm->monitor_page = NULL;
87 }
88
89 acrn_vm_all_ram_unmap(vm);
90
91 dev_dbg(acrn_dev.this_device, "VM %u destroyed.\n", vm->vmid);
92 vm->vmid = ACRN_INVALID_VMID;
93 return 0;
94}
95
96/**
97 * acrn_msi_inject() - Inject a MSI interrupt into a User VM
98 * @vm: User VM
99 * @msi_addr: The MSI address
100 * @msi_data: The MSI data
101 *
102 * Return: 0 on success, <0 on error
103 */
104int acrn_msi_inject(struct acrn_vm *vm, u64 msi_addr, u64 msi_data)
105{
106 struct acrn_msi_entry *msi;
107 int ret;
108
109 /* might be used in interrupt context, so use GFP_ATOMIC */
110 msi = kzalloc_obj(*msi, GFP_ATOMIC);
111 if (!msi)
112 return -ENOMEM;
113
114 /*
115 * msi_addr: addr[19:12] with dest vcpu id
116 * msi_data: data[7:0] with vector
117 */
118 msi->msi_addr = msi_addr;
119 msi->msi_data = msi_data;
120 ret = hcall_inject_msi(vm->vmid, virt_to_phys(msi));
121 if (ret < 0)
122 dev_err(acrn_dev.this_device,
123 "Failed to inject MSI to VM %u!\n", vm->vmid);
124 kfree(msi);
125 return ret;
126}