xref: /linux/samples/acrn/vm-sample.c (revision 36ec807b627b4c0a0a382f0ae48eac7187d14b2b)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * A sample program to run a User VM on the ACRN hypervisor
4  *
5  * This sample runs in a Service VM, which is a privileged VM of ACRN.
6  * CONFIG_ACRN_HSM needs to be enabled in the Service VM.
7  *
8  * Guest VM code in guest16.s will be executed after the VM launched.
9  *
10  * Copyright (C) 2020 Intel Corporation. All rights reserved.
11  */
12 #include <stdio.h>
13 #include <stdint.h>
14 #include <stdlib.h>
15 #include <string.h>
16 #include <fcntl.h>
17 #include <unistd.h>
18 #include <signal.h>
19 #include <sys/ioctl.h>
20 #include <linux/acrn.h>
21 
22 #define GUEST_MEMORY_SIZE	(1024*1024)
23 void *guest_memory;
24 
25 extern const unsigned char guest16[], guest16_end[];
26 static char io_request_page[4096] __attribute__((aligned(4096)));
27 static struct acrn_io_request *io_req_buf = (struct acrn_io_request *)io_request_page;
28 
29 __u16 vcpu_num;
30 __u16 vmid;
31 
32 int hsm_fd;
33 int is_running = 1;
34 
35 void vm_exit(int sig)
36 {
37 	sig = sig;
38 
39 	is_running = 0;
40 	ioctl(hsm_fd, ACRN_IOCTL_PAUSE_VM, vmid);
41 	ioctl(hsm_fd, ACRN_IOCTL_DESTROY_IOREQ_CLIENT, 0);
42 }
43 
44 int main(int argc, char **argv)
45 {
46 	int vcpu_id, ret;
47 	struct acrn_vm_creation create_vm = {0};
48 	struct acrn_vm_memmap ram_map = {0};
49 	struct acrn_vcpu_regs regs;
50 	struct acrn_io_request *io_req;
51 	struct acrn_ioreq_notify __attribute__((aligned(8))) notify;
52 
53 	argc = argc;
54 	argv = argv;
55 
56 	ret = posix_memalign(&guest_memory, 4096, GUEST_MEMORY_SIZE);
57 	if (ret < 0) {
58 		printf("Not enough memory!\n");
59 		return -1;
60 	}
61 	hsm_fd = open("/dev/acrn_hsm", O_RDWR|O_CLOEXEC);
62 
63 	create_vm.ioreq_buf = (__u64)io_req_buf;
64 	ret = ioctl(hsm_fd, ACRN_IOCTL_CREATE_VM, &create_vm);
65 	printf("Created VM! [%d]\n", ret);
66 	vcpu_num = create_vm.vcpu_num;
67 	vmid = create_vm.vmid;
68 
69 	/* setup guest memory */
70 	ram_map.type = ACRN_MEMMAP_RAM;
71 	ram_map.vma_base = (__u64)guest_memory;
72 	ram_map.len = GUEST_MEMORY_SIZE;
73 	ram_map.user_vm_pa = 0;
74 	ram_map.attr = ACRN_MEM_ACCESS_RWX;
75 	ret = ioctl(hsm_fd, ACRN_IOCTL_SET_MEMSEG, &ram_map);
76 	printf("Set up VM memory! [%d]\n", ret);
77 
78 	memcpy(guest_memory, guest16, guest16_end-guest16);
79 
80 	/* setup vcpu registers */
81 	memset(&regs, 0, sizeof(regs));
82 	regs.vcpu_id = 0;
83 	regs.vcpu_regs.rip = 0;
84 
85 	/* CR0_ET | CR0_NE */
86 	regs.vcpu_regs.cr0 = 0x30U;
87 	regs.vcpu_regs.cs_ar = 0x009FU;
88 	regs.vcpu_regs.cs_sel = 0xF000U;
89 	regs.vcpu_regs.cs_limit = 0xFFFFU;
90 	regs.vcpu_regs.cs_base = 0 & 0xFFFF0000UL;
91 	regs.vcpu_regs.rip = 0 & 0xFFFFUL;
92 
93 	ret = ioctl(hsm_fd, ACRN_IOCTL_SET_VCPU_REGS, &regs);
94 	printf("Set up VM BSP registers! [%d]\n", ret);
95 
96 	/* create an ioreq client for this VM */
97 	ret = ioctl(hsm_fd, ACRN_IOCTL_CREATE_IOREQ_CLIENT, 0);
98 	printf("Created IO request client! [%d]\n", ret);
99 
100 	/* run vm */
101 	ret = ioctl(hsm_fd, ACRN_IOCTL_START_VM, vmid);
102 	printf("Start VM! [%d]\n", ret);
103 
104 	signal(SIGINT, vm_exit);
105 	while (is_running) {
106 		ret = ioctl(hsm_fd, ACRN_IOCTL_ATTACH_IOREQ_CLIENT, 0);
107 
108 		for (vcpu_id = 0; vcpu_id < vcpu_num; vcpu_id++) {
109 			io_req = &io_req_buf[vcpu_id];
110 			if ((__sync_add_and_fetch(&io_req->processed, 0) == ACRN_IOREQ_STATE_PROCESSING)
111 					&& (!io_req->kernel_handled))
112 				if (io_req->type == ACRN_IOREQ_TYPE_PORTIO) {
113 					int bytes, port, in;
114 
115 					port = io_req->reqs.pio_request.address;
116 					bytes = io_req->reqs.pio_request.size;
117 					in = (io_req->reqs.pio_request.direction == ACRN_IOREQ_DIR_READ);
118 					printf("Guest VM %s PIO[%x] with size[%x]\n", in ? "read" : "write", port, bytes);
119 
120 					notify.vmid = vmid;
121 					notify.vcpu = vcpu_id;
122 					ioctl(hsm_fd, ACRN_IOCTL_NOTIFY_REQUEST_FINISH, &notify);
123 				}
124 		}
125 	}
126 
127 	ret = ioctl(hsm_fd, ACRN_IOCTL_DESTROY_VM, NULL);
128 	printf("Destroy VM! [%d]\n", ret);
129 	close(hsm_fd);
130 	free(guest_memory);
131 	return 0;
132 }
133