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1 | /* | |
2 | * QEMU S390 virtio target | |
3 | * | |
4 | * Copyright (c) 2009 Alexander Graf <agraf@suse.de> | |
5 | * Copyright IBM Corp 2012 | |
6 | * | |
7 | * This library is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * Contributions after 2012-10-29 are licensed under the terms of the | |
18 | * GNU GPL, version 2 or (at your option) any later version. | |
19 | * | |
20 | * You should have received a copy of the GNU (Lesser) General Public | |
21 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
22 | */ | |
23 | ||
24 | #include "hw/hw.h" | |
25 | #include "block/block.h" | |
26 | #include "sysemu/blockdev.h" | |
27 | #include "sysemu/sysemu.h" | |
28 | #include "net/net.h" | |
29 | #include "hw/boards.h" | |
30 | #include "monitor/monitor.h" | |
31 | #include "hw/loader.h" | |
32 | #include "hw/virtio/virtio.h" | |
33 | #include "hw/sysbus.h" | |
34 | #include "sysemu/kvm.h" | |
35 | #include "exec/address-spaces.h" | |
36 | ||
37 | #include "hw/s390x/s390-virtio-bus.h" | |
38 | #include "hw/s390x/sclp.h" | |
39 | #include "hw/s390x/s390-virtio.h" | |
40 | ||
41 | //#define DEBUG_S390 | |
42 | ||
43 | #ifdef DEBUG_S390 | |
44 | #define DPRINTF(fmt, ...) \ | |
45 | do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) | |
46 | #else | |
47 | #define DPRINTF(fmt, ...) \ | |
48 | do { } while (0) | |
49 | #endif | |
50 | ||
51 | #define MAX_BLK_DEVS 10 | |
52 | #define ZIPL_FILENAME "s390-zipl.rom" | |
53 | ||
54 | static VirtIOS390Bus *s390_bus; | |
55 | static S390CPU **ipi_states; | |
56 | ||
57 | S390CPU *s390_cpu_addr2state(uint16_t cpu_addr) | |
58 | { | |
59 | if (cpu_addr >= smp_cpus) { | |
60 | return NULL; | |
61 | } | |
62 | ||
63 | return ipi_states[cpu_addr]; | |
64 | } | |
65 | ||
66 | static int s390_virtio_hcall_notify(const uint64_t *args) | |
67 | { | |
68 | uint64_t mem = args[0]; | |
69 | int r = 0, i; | |
70 | ||
71 | if (mem > ram_size) { | |
72 | VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i); | |
73 | if (dev) { | |
74 | virtio_queue_notify(dev->vdev, i); | |
75 | } else { | |
76 | r = -EINVAL; | |
77 | } | |
78 | } else { | |
79 | /* Early printk */ | |
80 | } | |
81 | return r; | |
82 | } | |
83 | ||
84 | static int s390_virtio_hcall_reset(const uint64_t *args) | |
85 | { | |
86 | uint64_t mem = args[0]; | |
87 | VirtIOS390Device *dev; | |
88 | ||
89 | dev = s390_virtio_bus_find_mem(s390_bus, mem); | |
90 | if (dev == NULL) { | |
91 | return -EINVAL; | |
92 | } | |
93 | virtio_reset(dev->vdev); | |
94 | stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS, 0); | |
95 | s390_virtio_device_sync(dev); | |
96 | s390_virtio_reset_idx(dev); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int s390_virtio_hcall_set_status(const uint64_t *args) | |
102 | { | |
103 | uint64_t mem = args[0]; | |
104 | int r = 0; | |
105 | VirtIOS390Device *dev; | |
106 | ||
107 | dev = s390_virtio_bus_find_mem(s390_bus, mem); | |
108 | if (dev) { | |
109 | s390_virtio_device_update_status(dev); | |
110 | } else { | |
111 | r = -EINVAL; | |
112 | } | |
113 | return r; | |
114 | } | |
115 | ||
116 | static void s390_virtio_register_hcalls(void) | |
117 | { | |
118 | s390_register_virtio_hypercall(KVM_S390_VIRTIO_NOTIFY, | |
119 | s390_virtio_hcall_notify); | |
120 | s390_register_virtio_hypercall(KVM_S390_VIRTIO_RESET, | |
121 | s390_virtio_hcall_reset); | |
122 | s390_register_virtio_hypercall(KVM_S390_VIRTIO_SET_STATUS, | |
123 | s390_virtio_hcall_set_status); | |
124 | } | |
125 | ||
126 | /* | |
127 | * The number of running CPUs. On s390 a shutdown is the state of all CPUs | |
128 | * being either stopped or disabled (for interrupts) waiting. We have to | |
129 | * track this number to call the shutdown sequence accordingly. This | |
130 | * number is modified either on startup or while holding the big qemu lock. | |
131 | */ | |
132 | static unsigned s390_running_cpus; | |
133 | ||
134 | void s390_add_running_cpu(S390CPU *cpu) | |
135 | { | |
136 | CPUState *cs = CPU(cpu); | |
137 | CPUS390XState *env = &cpu->env; | |
138 | ||
139 | if (cs->halted) { | |
140 | s390_running_cpus++; | |
141 | cs->halted = 0; | |
142 | env->exception_index = -1; | |
143 | } | |
144 | } | |
145 | ||
146 | unsigned s390_del_running_cpu(S390CPU *cpu) | |
147 | { | |
148 | CPUState *cs = CPU(cpu); | |
149 | CPUS390XState *env = &cpu->env; | |
150 | ||
151 | if (cs->halted == 0) { | |
152 | assert(s390_running_cpus >= 1); | |
153 | s390_running_cpus--; | |
154 | cs->halted = 1; | |
155 | env->exception_index = EXCP_HLT; | |
156 | } | |
157 | return s390_running_cpus; | |
158 | } | |
159 | ||
160 | void s390_init_ipl_dev(const char *kernel_filename, | |
161 | const char *kernel_cmdline, | |
162 | const char *initrd_filename, | |
163 | const char *firmware) | |
164 | { | |
165 | DeviceState *dev; | |
166 | ||
167 | dev = qdev_create(NULL, "s390-ipl"); | |
168 | if (kernel_filename) { | |
169 | qdev_prop_set_string(dev, "kernel", kernel_filename); | |
170 | } | |
171 | if (initrd_filename) { | |
172 | qdev_prop_set_string(dev, "initrd", initrd_filename); | |
173 | } | |
174 | qdev_prop_set_string(dev, "cmdline", kernel_cmdline); | |
175 | qdev_prop_set_string(dev, "firmware", firmware); | |
176 | qdev_init_nofail(dev); | |
177 | } | |
178 | ||
179 | void s390_init_cpus(const char *cpu_model, uint8_t *storage_keys) | |
180 | { | |
181 | int i; | |
182 | ||
183 | if (cpu_model == NULL) { | |
184 | cpu_model = "host"; | |
185 | } | |
186 | ||
187 | ipi_states = g_malloc(sizeof(S390CPU *) * smp_cpus); | |
188 | ||
189 | for (i = 0; i < smp_cpus; i++) { | |
190 | S390CPU *cpu; | |
191 | CPUState *cs; | |
192 | ||
193 | cpu = cpu_s390x_init(cpu_model); | |
194 | cs = CPU(cpu); | |
195 | ||
196 | ipi_states[i] = cpu; | |
197 | cs->halted = 1; | |
198 | cpu->env.exception_index = EXCP_HLT; | |
199 | cpu->env.storage_keys = storage_keys; | |
200 | } | |
201 | } | |
202 | ||
203 | ||
204 | void s390_create_virtio_net(BusState *bus, const char *name) | |
205 | { | |
206 | int i; | |
207 | ||
208 | for (i = 0; i < nb_nics; i++) { | |
209 | NICInfo *nd = &nd_table[i]; | |
210 | DeviceState *dev; | |
211 | ||
212 | if (!nd->model) { | |
213 | nd->model = g_strdup("virtio"); | |
214 | } | |
215 | ||
216 | if (strcmp(nd->model, "virtio")) { | |
217 | fprintf(stderr, "S390 only supports VirtIO nics\n"); | |
218 | exit(1); | |
219 | } | |
220 | ||
221 | dev = qdev_create(bus, name); | |
222 | qdev_set_nic_properties(dev, nd); | |
223 | qdev_init_nofail(dev); | |
224 | } | |
225 | } | |
226 | ||
227 | /* PC hardware initialisation */ | |
228 | static void s390_init(QEMUMachineInitArgs *args) | |
229 | { | |
230 | ram_addr_t my_ram_size = args->ram_size; | |
231 | MemoryRegion *sysmem = get_system_memory(); | |
232 | MemoryRegion *ram = g_new(MemoryRegion, 1); | |
233 | int shift = 0; | |
234 | uint8_t *storage_keys; | |
235 | void *virtio_region; | |
236 | hwaddr virtio_region_len; | |
237 | hwaddr virtio_region_start; | |
238 | ||
239 | /* s390x ram size detection needs a 16bit multiplier + an increment. So | |
240 | guests > 64GB can be specified in 2MB steps etc. */ | |
241 | while ((my_ram_size >> (20 + shift)) > 65535) { | |
242 | shift++; | |
243 | } | |
244 | my_ram_size = my_ram_size >> (20 + shift) << (20 + shift); | |
245 | ||
246 | /* let's propagate the changed ram size into the global variable. */ | |
247 | ram_size = my_ram_size; | |
248 | ||
249 | /* get a BUS */ | |
250 | s390_bus = s390_virtio_bus_init(&my_ram_size); | |
251 | s390_sclp_init(); | |
252 | s390_init_ipl_dev(args->kernel_filename, args->kernel_cmdline, | |
253 | args->initrd_filename, ZIPL_FILENAME); | |
254 | ||
255 | /* register hypercalls */ | |
256 | s390_virtio_register_hcalls(); | |
257 | ||
258 | /* allocate RAM */ | |
259 | memory_region_init_ram(ram, NULL, "s390.ram", my_ram_size); | |
260 | vmstate_register_ram_global(ram); | |
261 | memory_region_add_subregion(sysmem, 0, ram); | |
262 | ||
263 | /* clear virtio region */ | |
264 | virtio_region_len = my_ram_size - ram_size; | |
265 | virtio_region_start = ram_size; | |
266 | virtio_region = cpu_physical_memory_map(virtio_region_start, | |
267 | &virtio_region_len, true); | |
268 | memset(virtio_region, 0, virtio_region_len); | |
269 | cpu_physical_memory_unmap(virtio_region, virtio_region_len, 1, | |
270 | virtio_region_len); | |
271 | ||
272 | /* allocate storage keys */ | |
273 | storage_keys = g_malloc0(my_ram_size / TARGET_PAGE_SIZE); | |
274 | ||
275 | /* init CPUs */ | |
276 | s390_init_cpus(args->cpu_model, storage_keys); | |
277 | ||
278 | /* Create VirtIO network adapters */ | |
279 | s390_create_virtio_net((BusState *)s390_bus, "virtio-net-s390"); | |
280 | } | |
281 | ||
282 | static QEMUMachine s390_machine = { | |
283 | .name = "s390-virtio", | |
284 | .alias = "s390", | |
285 | .desc = "VirtIO based S390 machine", | |
286 | .init = s390_init, | |
287 | .block_default_type = IF_VIRTIO, | |
288 | .no_cdrom = 1, | |
289 | .no_floppy = 1, | |
290 | .no_serial = 1, | |
291 | .no_parallel = 1, | |
292 | .no_sdcard = 1, | |
293 | .use_virtcon = 1, | |
294 | .max_cpus = 255, | |
295 | .is_default = 1, | |
296 | }; | |
297 | ||
298 | static void s390_machine_init(void) | |
299 | { | |
300 | qemu_register_machine(&s390_machine); | |
301 | } | |
302 | ||
303 | machine_init(s390_machine_init); |