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 need 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)
 23void *guest_memory;
 24
 25extern const unsigned char guest16[], guest16_end[];
 26static char io_request_page[4096] __attribute__((aligned(4096)));
 27static struct acrn_io_request *io_req_buf = (struct acrn_io_request *)io_request_page;
 28
 29__u16 vcpu_num;
 30__u16 vmid;
 31
 32int hsm_fd;
 33int is_running = 1;
 34
 35void 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
 44int 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("No 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}