virtio-net: check the existence of peer before accessing vDPA config
[qemu.git] / hw / pci-host / i440fx.c
1 /*
2 * QEMU i440FX PCI Bridge Emulation
3 *
4 * Copyright (c) 2006 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "qemu/units.h"
27 #include "qemu/range.h"
28 #include "hw/i386/pc.h"
29 #include "hw/pci/pci.h"
30 #include "hw/pci/pci_host.h"
31 #include "hw/pci-host/i440fx.h"
32 #include "hw/qdev-properties.h"
33 #include "hw/sysbus.h"
34 #include "qapi/error.h"
35 #include "migration/vmstate.h"
36 #include "qapi/visitor.h"
37 #include "qemu/error-report.h"
38
39 /*
40 * I440FX chipset data sheet.
41 * https://wiki.qemu.org/File:29054901.pdf
42 */
43
44 #define I440FX_PCI_HOST_BRIDGE(obj) \
45 OBJECT_CHECK(I440FXState, (obj), TYPE_I440FX_PCI_HOST_BRIDGE)
46
47 typedef struct I440FXState {
48 PCIHostState parent_obj;
49 Range pci_hole;
50 uint64_t pci_hole64_size;
51 bool pci_hole64_fix;
52 uint32_t short_root_bus;
53 } I440FXState;
54
55 #define I440FX_PAM 0x59
56 #define I440FX_PAM_SIZE 7
57 #define I440FX_SMRAM 0x72
58
59 /* Keep it 2G to comply with older win32 guests */
60 #define I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT (1ULL << 31)
61
62 /* Older coreboot versions (4.0 and older) read a config register that doesn't
63 * exist in real hardware, to get the RAM size from QEMU.
64 */
65 #define I440FX_COREBOOT_RAM_SIZE 0x57
66
67 static void i440fx_update_memory_mappings(PCII440FXState *d)
68 {
69 int i;
70 PCIDevice *pd = PCI_DEVICE(d);
71
72 memory_region_transaction_begin();
73 for (i = 0; i < ARRAY_SIZE(d->pam_regions); i++) {
74 pam_update(&d->pam_regions[i], i,
75 pd->config[I440FX_PAM + DIV_ROUND_UP(i, 2)]);
76 }
77 memory_region_set_enabled(&d->smram_region,
78 !(pd->config[I440FX_SMRAM] & SMRAM_D_OPEN));
79 memory_region_set_enabled(&d->smram,
80 pd->config[I440FX_SMRAM] & SMRAM_G_SMRAME);
81 memory_region_transaction_commit();
82 }
83
84
85 static void i440fx_write_config(PCIDevice *dev,
86 uint32_t address, uint32_t val, int len)
87 {
88 PCII440FXState *d = I440FX_PCI_DEVICE(dev);
89
90 /* XXX: implement SMRAM.D_LOCK */
91 pci_default_write_config(dev, address, val, len);
92 if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
93 range_covers_byte(address, len, I440FX_SMRAM)) {
94 i440fx_update_memory_mappings(d);
95 }
96 }
97
98 static int i440fx_post_load(void *opaque, int version_id)
99 {
100 PCII440FXState *d = opaque;
101
102 i440fx_update_memory_mappings(d);
103 return 0;
104 }
105
106 static const VMStateDescription vmstate_i440fx = {
107 .name = "I440FX",
108 .version_id = 3,
109 .minimum_version_id = 3,
110 .post_load = i440fx_post_load,
111 .fields = (VMStateField[]) {
112 VMSTATE_PCI_DEVICE(parent_obj, PCII440FXState),
113 /* Used to be smm_enabled, which was basically always zero because
114 * SeaBIOS hardly uses SMM. SMRAM is now handled by CPU code.
115 */
116 VMSTATE_UNUSED(1),
117 VMSTATE_END_OF_LIST()
118 }
119 };
120
121 static void i440fx_pcihost_get_pci_hole_start(Object *obj, Visitor *v,
122 const char *name, void *opaque,
123 Error **errp)
124 {
125 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
126 uint64_t val64;
127 uint32_t value;
128
129 val64 = range_is_empty(&s->pci_hole) ? 0 : range_lob(&s->pci_hole);
130 value = val64;
131 assert(value == val64);
132 visit_type_uint32(v, name, &value, errp);
133 }
134
135 static void i440fx_pcihost_get_pci_hole_end(Object *obj, Visitor *v,
136 const char *name, void *opaque,
137 Error **errp)
138 {
139 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
140 uint64_t val64;
141 uint32_t value;
142
143 val64 = range_is_empty(&s->pci_hole) ? 0 : range_upb(&s->pci_hole) + 1;
144 value = val64;
145 assert(value == val64);
146 visit_type_uint32(v, name, &value, errp);
147 }
148
149 /*
150 * The 64bit PCI hole start is set by the Guest firmware
151 * as the address of the first 64bit PCI MEM resource.
152 * If no PCI device has resources on the 64bit area,
153 * the 64bit PCI hole will start after "over 4G RAM" and the
154 * reserved space for memory hotplug if any.
155 */
156 static uint64_t i440fx_pcihost_get_pci_hole64_start_value(Object *obj)
157 {
158 PCIHostState *h = PCI_HOST_BRIDGE(obj);
159 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
160 Range w64;
161 uint64_t value;
162
163 pci_bus_get_w64_range(h->bus, &w64);
164 value = range_is_empty(&w64) ? 0 : range_lob(&w64);
165 if (!value && s->pci_hole64_fix) {
166 value = pc_pci_hole64_start();
167 }
168 return value;
169 }
170
171 static void i440fx_pcihost_get_pci_hole64_start(Object *obj, Visitor *v,
172 const char *name,
173 void *opaque, Error **errp)
174 {
175 uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj);
176
177 visit_type_uint64(v, name, &hole64_start, errp);
178 }
179
180 /*
181 * The 64bit PCI hole end is set by the Guest firmware
182 * as the address of the last 64bit PCI MEM resource.
183 * Then it is expanded to the PCI_HOST_PROP_PCI_HOLE64_SIZE
184 * that can be configured by the user.
185 */
186 static void i440fx_pcihost_get_pci_hole64_end(Object *obj, Visitor *v,
187 const char *name, void *opaque,
188 Error **errp)
189 {
190 PCIHostState *h = PCI_HOST_BRIDGE(obj);
191 I440FXState *s = I440FX_PCI_HOST_BRIDGE(obj);
192 uint64_t hole64_start = i440fx_pcihost_get_pci_hole64_start_value(obj);
193 Range w64;
194 uint64_t value, hole64_end;
195
196 pci_bus_get_w64_range(h->bus, &w64);
197 value = range_is_empty(&w64) ? 0 : range_upb(&w64) + 1;
198 hole64_end = ROUND_UP(hole64_start + s->pci_hole64_size, 1ULL << 30);
199 if (s->pci_hole64_fix && value < hole64_end) {
200 value = hole64_end;
201 }
202 visit_type_uint64(v, name, &value, errp);
203 }
204
205 static void i440fx_pcihost_initfn(Object *obj)
206 {
207 PCIHostState *s = PCI_HOST_BRIDGE(obj);
208
209 memory_region_init_io(&s->conf_mem, obj, &pci_host_conf_le_ops, s,
210 "pci-conf-idx", 4);
211 memory_region_init_io(&s->data_mem, obj, &pci_host_data_le_ops, s,
212 "pci-conf-data", 4);
213
214 object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "uint32",
215 i440fx_pcihost_get_pci_hole_start,
216 NULL, NULL, NULL);
217
218 object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "uint32",
219 i440fx_pcihost_get_pci_hole_end,
220 NULL, NULL, NULL);
221
222 object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "uint64",
223 i440fx_pcihost_get_pci_hole64_start,
224 NULL, NULL, NULL);
225
226 object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "uint64",
227 i440fx_pcihost_get_pci_hole64_end,
228 NULL, NULL, NULL);
229 }
230
231 static void i440fx_pcihost_realize(DeviceState *dev, Error **errp)
232 {
233 PCIHostState *s = PCI_HOST_BRIDGE(dev);
234 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
235
236 sysbus_add_io(sbd, 0xcf8, &s->conf_mem);
237 sysbus_init_ioports(sbd, 0xcf8, 4);
238
239 sysbus_add_io(sbd, 0xcfc, &s->data_mem);
240 sysbus_init_ioports(sbd, 0xcfc, 4);
241
242 /* register i440fx 0xcf8 port as coalesced pio */
243 memory_region_set_flush_coalesced(&s->data_mem);
244 memory_region_add_coalescing(&s->conf_mem, 0, 4);
245 }
246
247 static void i440fx_realize(PCIDevice *dev, Error **errp)
248 {
249 dev->config[I440FX_SMRAM] = 0x02;
250
251 if (object_property_get_bool(qdev_get_machine(), "iommu", NULL)) {
252 warn_report("i440fx doesn't support emulated iommu");
253 }
254 }
255
256 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
257 PCII440FXState **pi440fx_state,
258 MemoryRegion *address_space_mem,
259 MemoryRegion *address_space_io,
260 ram_addr_t ram_size,
261 ram_addr_t below_4g_mem_size,
262 ram_addr_t above_4g_mem_size,
263 MemoryRegion *pci_address_space,
264 MemoryRegion *ram_memory)
265 {
266 DeviceState *dev;
267 PCIBus *b;
268 PCIDevice *d;
269 PCIHostState *s;
270 PCII440FXState *f;
271 unsigned i;
272 I440FXState *i440fx;
273
274 dev = qdev_new(host_type);
275 s = PCI_HOST_BRIDGE(dev);
276 b = pci_root_bus_new(dev, NULL, pci_address_space,
277 address_space_io, 0, TYPE_PCI_BUS);
278 s->bus = b;
279 object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev));
280 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
281
282 d = pci_create_simple(b, 0, pci_type);
283 *pi440fx_state = I440FX_PCI_DEVICE(d);
284 f = *pi440fx_state;
285 f->system_memory = address_space_mem;
286 f->pci_address_space = pci_address_space;
287 f->ram_memory = ram_memory;
288
289 i440fx = I440FX_PCI_HOST_BRIDGE(dev);
290 range_set_bounds(&i440fx->pci_hole, below_4g_mem_size,
291 IO_APIC_DEFAULT_ADDRESS - 1);
292
293 /* setup pci memory mapping */
294 pc_pci_as_mapping_init(OBJECT(f), f->system_memory,
295 f->pci_address_space);
296
297 /* if *disabled* show SMRAM to all CPUs */
298 memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region",
299 f->pci_address_space, 0xa0000, 0x20000);
300 memory_region_add_subregion_overlap(f->system_memory, 0xa0000,
301 &f->smram_region, 1);
302 memory_region_set_enabled(&f->smram_region, true);
303
304 /* smram, as seen by SMM CPUs */
305 memory_region_init(&f->smram, OBJECT(d), "smram", 4 * GiB);
306 memory_region_set_enabled(&f->smram, true);
307 memory_region_init_alias(&f->low_smram, OBJECT(d), "smram-low",
308 f->ram_memory, 0xa0000, 0x20000);
309 memory_region_set_enabled(&f->low_smram, true);
310 memory_region_add_subregion(&f->smram, 0xa0000, &f->low_smram);
311 object_property_add_const_link(qdev_get_machine(), "smram",
312 OBJECT(&f->smram));
313
314 init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
315 &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
316 for (i = 0; i < ARRAY_SIZE(f->pam_regions) - 1; ++i) {
317 init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
318 &f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
319 PAM_EXPAN_SIZE);
320 }
321
322 ram_size = ram_size / 8 / 1024 / 1024;
323 if (ram_size > 255) {
324 ram_size = 255;
325 }
326 d->config[I440FX_COREBOOT_RAM_SIZE] = ram_size;
327
328 i440fx_update_memory_mappings(f);
329
330 return b;
331 }
332
333 PCIBus *find_i440fx(void)
334 {
335 PCIHostState *s = OBJECT_CHECK(PCIHostState,
336 object_resolve_path("/machine/i440fx", NULL),
337 TYPE_PCI_HOST_BRIDGE);
338 return s ? s->bus : NULL;
339 }
340
341 static void i440fx_class_init(ObjectClass *klass, void *data)
342 {
343 DeviceClass *dc = DEVICE_CLASS(klass);
344 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
345
346 k->realize = i440fx_realize;
347 k->config_write = i440fx_write_config;
348 k->vendor_id = PCI_VENDOR_ID_INTEL;
349 k->device_id = PCI_DEVICE_ID_INTEL_82441;
350 k->revision = 0x02;
351 k->class_id = PCI_CLASS_BRIDGE_HOST;
352 dc->desc = "Host bridge";
353 dc->vmsd = &vmstate_i440fx;
354 /*
355 * PCI-facing part of the host bridge, not usable without the
356 * host-facing part, which can't be device_add'ed, yet.
357 */
358 dc->user_creatable = false;
359 dc->hotpluggable = false;
360 }
361
362 static const TypeInfo i440fx_info = {
363 .name = TYPE_I440FX_PCI_DEVICE,
364 .parent = TYPE_PCI_DEVICE,
365 .instance_size = sizeof(PCII440FXState),
366 .class_init = i440fx_class_init,
367 .interfaces = (InterfaceInfo[]) {
368 { INTERFACE_CONVENTIONAL_PCI_DEVICE },
369 { },
370 },
371 };
372
373 static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
374 PCIBus *rootbus)
375 {
376 I440FXState *s = I440FX_PCI_HOST_BRIDGE(host_bridge);
377
378 /* For backwards compat with old device paths */
379 if (s->short_root_bus) {
380 return "0000";
381 }
382 return "0000:00";
383 }
384
385 static Property i440fx_props[] = {
386 DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState,
387 pci_hole64_size, I440FX_PCI_HOST_HOLE64_SIZE_DEFAULT),
388 DEFINE_PROP_UINT32("short_root_bus", I440FXState, short_root_bus, 0),
389 DEFINE_PROP_BOOL("x-pci-hole64-fix", I440FXState, pci_hole64_fix, true),
390 DEFINE_PROP_END_OF_LIST(),
391 };
392
393 static void i440fx_pcihost_class_init(ObjectClass *klass, void *data)
394 {
395 DeviceClass *dc = DEVICE_CLASS(klass);
396 PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(klass);
397
398 hc->root_bus_path = i440fx_pcihost_root_bus_path;
399 dc->realize = i440fx_pcihost_realize;
400 dc->fw_name = "pci";
401 device_class_set_props(dc, i440fx_props);
402 /* Reason: needs to be wired up by pc_init1 */
403 dc->user_creatable = false;
404 }
405
406 static const TypeInfo i440fx_pcihost_info = {
407 .name = TYPE_I440FX_PCI_HOST_BRIDGE,
408 .parent = TYPE_PCI_HOST_BRIDGE,
409 .instance_size = sizeof(I440FXState),
410 .instance_init = i440fx_pcihost_initfn,
411 .class_init = i440fx_pcihost_class_init,
412 };
413
414 static void i440fx_register_types(void)
415 {
416 type_register_static(&i440fx_info);
417 type_register_static(&i440fx_pcihost_info);
418 }
419
420 type_init(i440fx_register_types)