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1/*
2 * QEMU S390 virtio target
3 *
4 * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include "hw.h"
21#include "block.h"
6c33286a 22#include "blockdev.h"
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23#include "sysemu.h"
24#include "net.h"
25#include "boards.h"
26#include "monitor.h"
27#include "loader.h"
28#include "elf.h"
29#include "hw/virtio.h"
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30#include "hw/sysbus.h"
31#include "kvm.h"
32
33#include "hw/s390-virtio-bus.h"
34
35//#define DEBUG_S390
36
37#ifdef DEBUG_S390
38#define dprintf(fmt, ...) \
39 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
40#else
41#define dprintf(fmt, ...) \
42 do { } while (0)
43#endif
44
45#define KVM_S390_VIRTIO_NOTIFY 0
46#define KVM_S390_VIRTIO_RESET 1
47#define KVM_S390_VIRTIO_SET_STATUS 2
48
49#define KERN_IMAGE_START 0x010000UL
50#define KERN_PARM_AREA 0x010480UL
51#define INITRD_START 0x800000UL
52#define INITRD_PARM_START 0x010408UL
53#define INITRD_PARM_SIZE 0x010410UL
54#define PARMFILE_START 0x001000UL
55
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56#define ZIPL_START 0x009000UL
57#define ZIPL_LOAD_ADDR 0x009000UL
58#define ZIPL_FILENAME "s390-zipl.rom"
59
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60#define MAX_BLK_DEVS 10
61
62static VirtIOS390Bus *s390_bus;
63static CPUState **ipi_states;
64
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65CPUState *s390_cpu_addr2state(uint16_t cpu_addr)
66{
67 if (cpu_addr >= smp_cpus) {
68 return NULL;
69 }
70
71 return ipi_states[cpu_addr];
72}
73
8d5192ee 74int s390_virtio_hypercall(CPUState *env, uint64_t mem, uint64_t hypercall)
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75{
76 int r = 0, i;
8cb310e1 77
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78 dprintf("KVM hypercall: %ld\n", hypercall);
79 switch (hypercall) {
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80 case KVM_S390_VIRTIO_NOTIFY:
81 if (mem > ram_size) {
82 VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus,
83 mem, &i);
84 if (dev) {
85 virtio_queue_notify(dev->vdev, i);
86 } else {
87 r = -EINVAL;
88 }
89 } else {
90 /* Early printk */
91 }
92 break;
93 case KVM_S390_VIRTIO_RESET:
94 {
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95 VirtIOS390Device *dev;
96
97 dev = s390_virtio_bus_find_mem(s390_bus, mem);
98 virtio_reset(dev->vdev);
99 s390_virtio_device_sync(dev);
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100 break;
101 }
102 case KVM_S390_VIRTIO_SET_STATUS:
103 {
104 VirtIOS390Device *dev;
105
106 dev = s390_virtio_bus_find_mem(s390_bus, mem);
107 if (dev) {
108 s390_virtio_device_update_status(dev);
109 } else {
110 r = -EINVAL;
111 }
112 break;
113 }
114 default:
115 r = -EINVAL;
116 break;
117 }
118
8d5192ee 119 return r;
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120}
121
122/* PC hardware initialisation */
22486aa0 123static void s390_init(ram_addr_t my_ram_size,
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124 const char *boot_device,
125 const char *kernel_filename,
126 const char *kernel_cmdline,
127 const char *initrd_filename,
128 const char *cpu_model)
129{
130 CPUState *env = NULL;
131 ram_addr_t ram_addr;
132 ram_addr_t kernel_size = 0;
133 ram_addr_t initrd_offset;
134 ram_addr_t initrd_size = 0;
22486aa0 135 int shift = 0;
8d5192ee 136 uint8_t *storage_keys;
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137 int i;
138
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139 /* s390x ram size detection needs a 16bit multiplier + an increment. So
140 guests > 64GB can be specified in 2MB steps etc. */
141 while ((my_ram_size >> (20 + shift)) > 65535) {
142 shift++;
143 }
144 my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
145
146 /* lets propagate the changed ram size into the global variable. */
147 ram_size = my_ram_size;
e249651c 148
8cb310e1 149 /* get a BUS */
22486aa0 150 s390_bus = s390_virtio_bus_init(&my_ram_size);
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151
152 /* allocate RAM */
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153 ram_addr = qemu_ram_alloc(NULL, "s390.ram", my_ram_size);
154 cpu_register_physical_memory(0, my_ram_size, ram_addr);
8cb310e1 155
8d5192ee 156 /* allocate storage keys */
7267c094 157 storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE);
8d5192ee 158
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159 /* init CPUs */
160 if (cpu_model == NULL) {
161 cpu_model = "host";
162 }
163
7267c094 164 ipi_states = g_malloc(sizeof(CPUState *) * smp_cpus);
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165
166 for (i = 0; i < smp_cpus; i++) {
167 CPUState *tmp_env;
168
169 tmp_env = cpu_init(cpu_model);
170 if (!env) {
171 env = tmp_env;
172 }
173 ipi_states[i] = tmp_env;
174 tmp_env->halted = 1;
175 tmp_env->exception_index = EXCP_HLT;
8d5192ee 176 tmp_env->storage_keys = storage_keys;
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177 }
178
179 env->halted = 0;
180 env->exception_index = 0;
181
182 if (kernel_filename) {
183 kernel_size = load_image(kernel_filename, qemu_get_ram_ptr(0));
184
04bc74ed 185 if (lduw_be_phys(KERN_IMAGE_START) != 0x0dd0) {
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186 fprintf(stderr, "Specified image is not an s390 boot image\n");
187 exit(1);
188 }
189
8cb310e1 190 env->psw.addr = KERN_IMAGE_START;
0435d393 191 env->psw.mask = 0x0000000180000000ULL;
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192 } else {
193 ram_addr_t bios_size = 0;
194 char *bios_filename;
195
196 /* Load zipl bootloader */
197 if (bios_name == NULL) {
198 bios_name = ZIPL_FILENAME;
199 }
200
201 bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
202 bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));
7267c094 203 g_free(bios_filename);
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204
205 if ((long)bios_size < 0) {
206 hw_error("could not load bootloader '%s'\n", bios_name);
207 }
208
209 if (bios_size > 4096) {
210 hw_error("stage1 bootloader is > 4k\n");
211 }
212
213 env->psw.addr = ZIPL_START;
214 env->psw.mask = 0x0000000180000000ULL;
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215 }
216
217 if (initrd_filename) {
218 initrd_offset = INITRD_START;
219 while (kernel_size + 0x100000 > initrd_offset) {
220 initrd_offset += 0x100000;
221 }
222 initrd_size = load_image(initrd_filename, qemu_get_ram_ptr(initrd_offset));
223
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224 stq_be_phys(INITRD_PARM_START, initrd_offset);
225 stq_be_phys(INITRD_PARM_SIZE, initrd_size);
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226 }
227
228 if (kernel_cmdline) {
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229 cpu_physical_memory_write(KERN_PARM_AREA, kernel_cmdline,
230 strlen(kernel_cmdline));
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231 }
232
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233 /* Create VirtIO network adapters */
234 for(i = 0; i < nb_nics; i++) {
235 NICInfo *nd = &nd_table[i];
236 DeviceState *dev;
237
238 if (!nd->model) {
7267c094 239 nd->model = g_strdup("virtio");
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240 }
241
242 if (strcmp(nd->model, "virtio")) {
243 fprintf(stderr, "S390 only supports VirtIO nics\n");
244 exit(1);
245 }
246
247 dev = qdev_create((BusState *)s390_bus, "virtio-net-s390");
248 qdev_set_nic_properties(dev, nd);
249 qdev_init_nofail(dev);
250 }
251
252 /* Create VirtIO disk drives */
253 for(i = 0; i < MAX_BLK_DEVS; i++) {
254 DriveInfo *dinfo;
255 DeviceState *dev;
256
257 dinfo = drive_get(IF_IDE, 0, i);
258 if (!dinfo) {
259 continue;
260 }
261
262 dev = qdev_create((BusState *)s390_bus, "virtio-blk-s390");
18846dee 263 qdev_prop_set_drive_nofail(dev, "drive", dinfo->bdrv);
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264 qdev_init_nofail(dev);
265 }
266}
267
268static QEMUMachine s390_machine = {
269 .name = "s390-virtio",
270 .alias = "s390",
271 .desc = "VirtIO based S390 machine",
272 .init = s390_init,
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273 .no_serial = 1,
274 .no_parallel = 1,
cf708987 275 .use_virtcon = 1,
986c5f78 276 .no_vga = 1,
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277 .max_cpus = 255,
278 .is_default = 1,
279};
280
281static void s390_machine_init(void)
282{
283 qemu_register_machine(&s390_machine);
284}
285
286machine_init(s390_machine_init);