cpu: Move halted and interrupt_request fields to CPUState
[qemu.git] / xen-all.c
1 /*
2 * Copyright (C) 2010 Citrix Ltd.
3 *
4 * This work is licensed under the terms of the GNU GPL, version 2. See
5 * the COPYING file in the top-level directory.
6 *
7 * Contributions after 2012-01-13 are licensed under the terms of the
8 * GNU GPL, version 2 or (at your option) any later version.
9 */
10
11 #include <sys/mman.h>
12
13 #include "hw/pci/pci.h"
14 #include "hw/pc.h"
15 #include "hw/xen_common.h"
16 #include "hw/xen_backend.h"
17 #include "qmp-commands.h"
18
19 #include "char/char.h"
20 #include "qemu/range.h"
21 #include "sysemu/xen-mapcache.h"
22 #include "trace.h"
23 #include "exec/address-spaces.h"
24
25 #include <xen/hvm/ioreq.h>
26 #include <xen/hvm/params.h>
27 #include <xen/hvm/e820.h>
28
29 //#define DEBUG_XEN
30
31 #ifdef DEBUG_XEN
32 #define DPRINTF(fmt, ...) \
33 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
34 #else
35 #define DPRINTF(fmt, ...) \
36 do { } while (0)
37 #endif
38
39 static MemoryRegion ram_memory, ram_640k, ram_lo, ram_hi;
40 static MemoryRegion *framebuffer;
41 static bool xen_in_migration;
42
43 /* Compatibility with older version */
44 #if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
45 static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
46 {
47 return shared_page->vcpu_iodata[i].vp_eport;
48 }
49 static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
50 {
51 return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
52 }
53 # define FMT_ioreq_size PRIx64
54 #else
55 static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
56 {
57 return shared_page->vcpu_ioreq[i].vp_eport;
58 }
59 static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
60 {
61 return &shared_page->vcpu_ioreq[vcpu];
62 }
63 # define FMT_ioreq_size "u"
64 #endif
65 #ifndef HVM_PARAM_BUFIOREQ_EVTCHN
66 #define HVM_PARAM_BUFIOREQ_EVTCHN 26
67 #endif
68
69 #define BUFFER_IO_MAX_DELAY 100
70
71 typedef struct XenPhysmap {
72 hwaddr start_addr;
73 ram_addr_t size;
74 char *name;
75 hwaddr phys_offset;
76
77 QLIST_ENTRY(XenPhysmap) list;
78 } XenPhysmap;
79
80 typedef struct XenIOState {
81 shared_iopage_t *shared_page;
82 buffered_iopage_t *buffered_io_page;
83 QEMUTimer *buffered_io_timer;
84 /* the evtchn port for polling the notification, */
85 evtchn_port_t *ioreq_local_port;
86 /* evtchn local port for buffered io */
87 evtchn_port_t bufioreq_local_port;
88 /* the evtchn fd for polling */
89 XenEvtchn xce_handle;
90 /* which vcpu we are serving */
91 int send_vcpu;
92
93 struct xs_handle *xenstore;
94 MemoryListener memory_listener;
95 QLIST_HEAD(, XenPhysmap) physmap;
96 hwaddr free_phys_offset;
97 const XenPhysmap *log_for_dirtybit;
98
99 Notifier exit;
100 Notifier suspend;
101 } XenIOState;
102
103 /* Xen specific function for piix pci */
104
105 int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
106 {
107 return irq_num + ((pci_dev->devfn >> 3) << 2);
108 }
109
110 void xen_piix3_set_irq(void *opaque, int irq_num, int level)
111 {
112 xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2,
113 irq_num & 3, level);
114 }
115
116 void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
117 {
118 int i;
119
120 /* Scan for updates to PCI link routes (0x60-0x63). */
121 for (i = 0; i < len; i++) {
122 uint8_t v = (val >> (8 * i)) & 0xff;
123 if (v & 0x80) {
124 v = 0;
125 }
126 v &= 0xf;
127 if (((address + i) >= 0x60) && ((address + i) <= 0x63)) {
128 xc_hvm_set_pci_link_route(xen_xc, xen_domid, address + i - 0x60, v);
129 }
130 }
131 }
132
133 void xen_hvm_inject_msi(uint64_t addr, uint32_t data)
134 {
135 xen_xc_hvm_inject_msi(xen_xc, xen_domid, addr, data);
136 }
137
138 static void xen_suspend_notifier(Notifier *notifier, void *data)
139 {
140 xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 3);
141 }
142
143 /* Xen Interrupt Controller */
144
145 static void xen_set_irq(void *opaque, int irq, int level)
146 {
147 xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
148 }
149
150 qemu_irq *xen_interrupt_controller_init(void)
151 {
152 return qemu_allocate_irqs(xen_set_irq, NULL, 16);
153 }
154
155 /* Memory Ops */
156
157 static void xen_ram_init(ram_addr_t ram_size)
158 {
159 MemoryRegion *sysmem = get_system_memory();
160 ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
161 ram_addr_t block_len;
162
163 block_len = ram_size;
164 if (ram_size >= HVM_BELOW_4G_RAM_END) {
165 /* Xen does not allocate the memory continuously, and keep a hole at
166 * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
167 */
168 block_len += HVM_BELOW_4G_MMIO_LENGTH;
169 }
170 memory_region_init_ram(&ram_memory, "xen.ram", block_len);
171 vmstate_register_ram_global(&ram_memory);
172
173 if (ram_size >= HVM_BELOW_4G_RAM_END) {
174 above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
175 below_4g_mem_size = HVM_BELOW_4G_RAM_END;
176 } else {
177 below_4g_mem_size = ram_size;
178 }
179
180 memory_region_init_alias(&ram_640k, "xen.ram.640k",
181 &ram_memory, 0, 0xa0000);
182 memory_region_add_subregion(sysmem, 0, &ram_640k);
183 /* Skip of the VGA IO memory space, it will be registered later by the VGA
184 * emulated device.
185 *
186 * The area between 0xc0000 and 0x100000 will be used by SeaBIOS to load
187 * the Options ROM, so it is registered here as RAM.
188 */
189 memory_region_init_alias(&ram_lo, "xen.ram.lo",
190 &ram_memory, 0xc0000, below_4g_mem_size - 0xc0000);
191 memory_region_add_subregion(sysmem, 0xc0000, &ram_lo);
192 if (above_4g_mem_size > 0) {
193 memory_region_init_alias(&ram_hi, "xen.ram.hi",
194 &ram_memory, 0x100000000ULL,
195 above_4g_mem_size);
196 memory_region_add_subregion(sysmem, 0x100000000ULL, &ram_hi);
197 }
198 }
199
200 void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
201 {
202 unsigned long nr_pfn;
203 xen_pfn_t *pfn_list;
204 int i;
205
206 if (runstate_check(RUN_STATE_INMIGRATE)) {
207 /* RAM already populated in Xen */
208 fprintf(stderr, "%s: do not alloc "RAM_ADDR_FMT
209 " bytes of ram at "RAM_ADDR_FMT" when runstate is INMIGRATE\n",
210 __func__, size, ram_addr);
211 return;
212 }
213
214 if (mr == &ram_memory) {
215 return;
216 }
217
218 trace_xen_ram_alloc(ram_addr, size);
219
220 nr_pfn = size >> TARGET_PAGE_BITS;
221 pfn_list = g_malloc(sizeof (*pfn_list) * nr_pfn);
222
223 for (i = 0; i < nr_pfn; i++) {
224 pfn_list[i] = (ram_addr >> TARGET_PAGE_BITS) + i;
225 }
226
227 if (xc_domain_populate_physmap_exact(xen_xc, xen_domid, nr_pfn, 0, 0, pfn_list)) {
228 hw_error("xen: failed to populate ram at " RAM_ADDR_FMT, ram_addr);
229 }
230
231 g_free(pfn_list);
232 }
233
234 static XenPhysmap *get_physmapping(XenIOState *state,
235 hwaddr start_addr, ram_addr_t size)
236 {
237 XenPhysmap *physmap = NULL;
238
239 start_addr &= TARGET_PAGE_MASK;
240
241 QLIST_FOREACH(physmap, &state->physmap, list) {
242 if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) {
243 return physmap;
244 }
245 }
246 return NULL;
247 }
248
249 static hwaddr xen_phys_offset_to_gaddr(hwaddr start_addr,
250 ram_addr_t size, void *opaque)
251 {
252 hwaddr addr = start_addr & TARGET_PAGE_MASK;
253 XenIOState *xen_io_state = opaque;
254 XenPhysmap *physmap = NULL;
255
256 QLIST_FOREACH(physmap, &xen_io_state->physmap, list) {
257 if (range_covers_byte(physmap->phys_offset, physmap->size, addr)) {
258 return physmap->start_addr;
259 }
260 }
261
262 return start_addr;
263 }
264
265 #if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
266 static int xen_add_to_physmap(XenIOState *state,
267 hwaddr start_addr,
268 ram_addr_t size,
269 MemoryRegion *mr,
270 hwaddr offset_within_region)
271 {
272 unsigned long i = 0;
273 int rc = 0;
274 XenPhysmap *physmap = NULL;
275 hwaddr pfn, start_gpfn;
276 hwaddr phys_offset = memory_region_get_ram_addr(mr);
277 char path[80], value[17];
278
279 if (get_physmapping(state, start_addr, size)) {
280 return 0;
281 }
282 if (size <= 0) {
283 return -1;
284 }
285
286 /* Xen can only handle a single dirty log region for now and we want
287 * the linear framebuffer to be that region.
288 * Avoid tracking any regions that is not videoram and avoid tracking
289 * the legacy vga region. */
290 if (mr == framebuffer && start_addr > 0xbffff) {
291 goto go_physmap;
292 }
293 return -1;
294
295 go_physmap:
296 DPRINTF("mapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx"\n",
297 start_addr, start_addr + size);
298
299 pfn = phys_offset >> TARGET_PAGE_BITS;
300 start_gpfn = start_addr >> TARGET_PAGE_BITS;
301 for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
302 unsigned long idx = pfn + i;
303 xen_pfn_t gpfn = start_gpfn + i;
304
305 rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
306 if (rc) {
307 DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
308 PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
309 return -rc;
310 }
311 }
312
313 physmap = g_malloc(sizeof (XenPhysmap));
314
315 physmap->start_addr = start_addr;
316 physmap->size = size;
317 physmap->name = (char *)mr->name;
318 physmap->phys_offset = phys_offset;
319
320 QLIST_INSERT_HEAD(&state->physmap, physmap, list);
321
322 xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
323 start_addr >> TARGET_PAGE_BITS,
324 (start_addr + size) >> TARGET_PAGE_BITS,
325 XEN_DOMCTL_MEM_CACHEATTR_WB);
326
327 snprintf(path, sizeof(path),
328 "/local/domain/0/device-model/%d/physmap/%"PRIx64"/start_addr",
329 xen_domid, (uint64_t)phys_offset);
330 snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)start_addr);
331 if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
332 return -1;
333 }
334 snprintf(path, sizeof(path),
335 "/local/domain/0/device-model/%d/physmap/%"PRIx64"/size",
336 xen_domid, (uint64_t)phys_offset);
337 snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)size);
338 if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
339 return -1;
340 }
341 if (mr->name) {
342 snprintf(path, sizeof(path),
343 "/local/domain/0/device-model/%d/physmap/%"PRIx64"/name",
344 xen_domid, (uint64_t)phys_offset);
345 if (!xs_write(state->xenstore, 0, path, mr->name, strlen(mr->name))) {
346 return -1;
347 }
348 }
349
350 return 0;
351 }
352
353 static int xen_remove_from_physmap(XenIOState *state,
354 hwaddr start_addr,
355 ram_addr_t size)
356 {
357 unsigned long i = 0;
358 int rc = 0;
359 XenPhysmap *physmap = NULL;
360 hwaddr phys_offset = 0;
361
362 physmap = get_physmapping(state, start_addr, size);
363 if (physmap == NULL) {
364 return -1;
365 }
366
367 phys_offset = physmap->phys_offset;
368 size = physmap->size;
369
370 DPRINTF("unmapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx", from ",
371 "%"HWADDR_PRIx"\n", phys_offset, phys_offset + size, start_addr);
372
373 size >>= TARGET_PAGE_BITS;
374 start_addr >>= TARGET_PAGE_BITS;
375 phys_offset >>= TARGET_PAGE_BITS;
376 for (i = 0; i < size; i++) {
377 unsigned long idx = start_addr + i;
378 xen_pfn_t gpfn = phys_offset + i;
379
380 rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
381 if (rc) {
382 fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
383 PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
384 return -rc;
385 }
386 }
387
388 QLIST_REMOVE(physmap, list);
389 if (state->log_for_dirtybit == physmap) {
390 state->log_for_dirtybit = NULL;
391 }
392 free(physmap);
393
394 return 0;
395 }
396
397 #else
398 static int xen_add_to_physmap(XenIOState *state,
399 hwaddr start_addr,
400 ram_addr_t size,
401 MemoryRegion *mr,
402 hwaddr offset_within_region)
403 {
404 return -ENOSYS;
405 }
406
407 static int xen_remove_from_physmap(XenIOState *state,
408 hwaddr start_addr,
409 ram_addr_t size)
410 {
411 return -ENOSYS;
412 }
413 #endif
414
415 static void xen_set_memory(struct MemoryListener *listener,
416 MemoryRegionSection *section,
417 bool add)
418 {
419 XenIOState *state = container_of(listener, XenIOState, memory_listener);
420 hwaddr start_addr = section->offset_within_address_space;
421 ram_addr_t size = section->size;
422 bool log_dirty = memory_region_is_logging(section->mr);
423 hvmmem_type_t mem_type;
424
425 if (!memory_region_is_ram(section->mr)) {
426 return;
427 }
428
429 if (!(section->mr != &ram_memory
430 && ( (log_dirty && add) || (!log_dirty && !add)))) {
431 return;
432 }
433
434 trace_xen_client_set_memory(start_addr, size, log_dirty);
435
436 start_addr &= TARGET_PAGE_MASK;
437 size = TARGET_PAGE_ALIGN(size);
438
439 if (add) {
440 if (!memory_region_is_rom(section->mr)) {
441 xen_add_to_physmap(state, start_addr, size,
442 section->mr, section->offset_within_region);
443 } else {
444 mem_type = HVMMEM_ram_ro;
445 if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
446 start_addr >> TARGET_PAGE_BITS,
447 size >> TARGET_PAGE_BITS)) {
448 DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n",
449 start_addr);
450 }
451 }
452 } else {
453 if (xen_remove_from_physmap(state, start_addr, size) < 0) {
454 DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n", start_addr);
455 }
456 }
457 }
458
459 static void xen_region_add(MemoryListener *listener,
460 MemoryRegionSection *section)
461 {
462 xen_set_memory(listener, section, true);
463 }
464
465 static void xen_region_del(MemoryListener *listener,
466 MemoryRegionSection *section)
467 {
468 xen_set_memory(listener, section, false);
469 }
470
471 static void xen_sync_dirty_bitmap(XenIOState *state,
472 hwaddr start_addr,
473 ram_addr_t size)
474 {
475 hwaddr npages = size >> TARGET_PAGE_BITS;
476 const int width = sizeof(unsigned long) * 8;
477 unsigned long bitmap[(npages + width - 1) / width];
478 int rc, i, j;
479 const XenPhysmap *physmap = NULL;
480
481 physmap = get_physmapping(state, start_addr, size);
482 if (physmap == NULL) {
483 /* not handled */
484 return;
485 }
486
487 if (state->log_for_dirtybit == NULL) {
488 state->log_for_dirtybit = physmap;
489 } else if (state->log_for_dirtybit != physmap) {
490 /* Only one range for dirty bitmap can be tracked. */
491 return;
492 }
493
494 rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
495 start_addr >> TARGET_PAGE_BITS, npages,
496 bitmap);
497 if (rc < 0) {
498 if (rc != -ENODATA) {
499 memory_region_set_dirty(framebuffer, 0, size);
500 DPRINTF("xen: track_dirty_vram failed (0x" TARGET_FMT_plx
501 ", 0x" TARGET_FMT_plx "): %s\n",
502 start_addr, start_addr + size, strerror(-rc));
503 }
504 return;
505 }
506
507 for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
508 unsigned long map = bitmap[i];
509 while (map != 0) {
510 j = ffsl(map) - 1;
511 map &= ~(1ul << j);
512 memory_region_set_dirty(framebuffer,
513 (i * width + j) * TARGET_PAGE_SIZE,
514 TARGET_PAGE_SIZE);
515 };
516 }
517 }
518
519 static void xen_log_start(MemoryListener *listener,
520 MemoryRegionSection *section)
521 {
522 XenIOState *state = container_of(listener, XenIOState, memory_listener);
523
524 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
525 section->size);
526 }
527
528 static void xen_log_stop(MemoryListener *listener, MemoryRegionSection *section)
529 {
530 XenIOState *state = container_of(listener, XenIOState, memory_listener);
531
532 state->log_for_dirtybit = NULL;
533 /* Disable dirty bit tracking */
534 xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
535 }
536
537 static void xen_log_sync(MemoryListener *listener, MemoryRegionSection *section)
538 {
539 XenIOState *state = container_of(listener, XenIOState, memory_listener);
540
541 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
542 section->size);
543 }
544
545 static void xen_log_global_start(MemoryListener *listener)
546 {
547 if (xen_enabled()) {
548 xen_in_migration = true;
549 }
550 }
551
552 static void xen_log_global_stop(MemoryListener *listener)
553 {
554 xen_in_migration = false;
555 }
556
557 static MemoryListener xen_memory_listener = {
558 .region_add = xen_region_add,
559 .region_del = xen_region_del,
560 .log_start = xen_log_start,
561 .log_stop = xen_log_stop,
562 .log_sync = xen_log_sync,
563 .log_global_start = xen_log_global_start,
564 .log_global_stop = xen_log_global_stop,
565 .priority = 10,
566 };
567
568 void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
569 {
570 if (enable) {
571 memory_global_dirty_log_start();
572 } else {
573 memory_global_dirty_log_stop();
574 }
575 }
576
577 /* VCPU Operations, MMIO, IO ring ... */
578
579 static void xen_reset_vcpu(void *opaque)
580 {
581 CPUState *cpu = opaque;
582
583 cpu->halted = 1;
584 }
585
586 void xen_vcpu_init(void)
587 {
588 if (first_cpu != NULL) {
589 CPUState *cpu = ENV_GET_CPU(first_cpu);
590
591 qemu_register_reset(xen_reset_vcpu, cpu);
592 xen_reset_vcpu(cpu);
593 }
594 /* if rtc_clock is left to default (host_clock), disable it */
595 if (rtc_clock == host_clock) {
596 qemu_clock_enable(rtc_clock, false);
597 }
598 }
599
600 /* get the ioreq packets from share mem */
601 static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
602 {
603 ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu);
604
605 if (req->state != STATE_IOREQ_READY) {
606 DPRINTF("I/O request not ready: "
607 "%x, ptr: %x, port: %"PRIx64", "
608 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
609 req->state, req->data_is_ptr, req->addr,
610 req->data, req->count, req->size);
611 return NULL;
612 }
613
614 xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
615
616 req->state = STATE_IOREQ_INPROCESS;
617 return req;
618 }
619
620 /* use poll to get the port notification */
621 /* ioreq_vec--out,the */
622 /* retval--the number of ioreq packet */
623 static ioreq_t *cpu_get_ioreq(XenIOState *state)
624 {
625 int i;
626 evtchn_port_t port;
627
628 port = xc_evtchn_pending(state->xce_handle);
629 if (port == state->bufioreq_local_port) {
630 qemu_mod_timer(state->buffered_io_timer,
631 BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
632 return NULL;
633 }
634
635 if (port != -1) {
636 for (i = 0; i < smp_cpus; i++) {
637 if (state->ioreq_local_port[i] == port) {
638 break;
639 }
640 }
641
642 if (i == smp_cpus) {
643 hw_error("Fatal error while trying to get io event!\n");
644 }
645
646 /* unmask the wanted port again */
647 xc_evtchn_unmask(state->xce_handle, port);
648
649 /* get the io packet from shared memory */
650 state->send_vcpu = i;
651 return cpu_get_ioreq_from_shared_memory(state, i);
652 }
653
654 /* read error or read nothing */
655 return NULL;
656 }
657
658 static uint32_t do_inp(pio_addr_t addr, unsigned long size)
659 {
660 switch (size) {
661 case 1:
662 return cpu_inb(addr);
663 case 2:
664 return cpu_inw(addr);
665 case 4:
666 return cpu_inl(addr);
667 default:
668 hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size);
669 }
670 }
671
672 static void do_outp(pio_addr_t addr,
673 unsigned long size, uint32_t val)
674 {
675 switch (size) {
676 case 1:
677 return cpu_outb(addr, val);
678 case 2:
679 return cpu_outw(addr, val);
680 case 4:
681 return cpu_outl(addr, val);
682 default:
683 hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size);
684 }
685 }
686
687 /*
688 * Helper functions which read/write an object from/to physical guest
689 * memory, as part of the implementation of an ioreq.
690 *
691 * Equivalent to
692 * cpu_physical_memory_rw(addr + (req->df ? -1 : +1) * req->size * i,
693 * val, req->size, 0/1)
694 * except without the integer overflow problems.
695 */
696 static void rw_phys_req_item(hwaddr addr,
697 ioreq_t *req, uint32_t i, void *val, int rw)
698 {
699 /* Do everything unsigned so overflow just results in a truncated result
700 * and accesses to undesired parts of guest memory, which is up
701 * to the guest */
702 hwaddr offset = (hwaddr)req->size * i;
703 if (req->df) {
704 addr -= offset;
705 } else {
706 addr += offset;
707 }
708 cpu_physical_memory_rw(addr, val, req->size, rw);
709 }
710
711 static inline void read_phys_req_item(hwaddr addr,
712 ioreq_t *req, uint32_t i, void *val)
713 {
714 rw_phys_req_item(addr, req, i, val, 0);
715 }
716 static inline void write_phys_req_item(hwaddr addr,
717 ioreq_t *req, uint32_t i, void *val)
718 {
719 rw_phys_req_item(addr, req, i, val, 1);
720 }
721
722
723 static void cpu_ioreq_pio(ioreq_t *req)
724 {
725 uint32_t i;
726
727 if (req->dir == IOREQ_READ) {
728 if (!req->data_is_ptr) {
729 req->data = do_inp(req->addr, req->size);
730 } else {
731 uint32_t tmp;
732
733 for (i = 0; i < req->count; i++) {
734 tmp = do_inp(req->addr, req->size);
735 write_phys_req_item(req->data, req, i, &tmp);
736 }
737 }
738 } else if (req->dir == IOREQ_WRITE) {
739 if (!req->data_is_ptr) {
740 do_outp(req->addr, req->size, req->data);
741 } else {
742 for (i = 0; i < req->count; i++) {
743 uint32_t tmp = 0;
744
745 read_phys_req_item(req->data, req, i, &tmp);
746 do_outp(req->addr, req->size, tmp);
747 }
748 }
749 }
750 }
751
752 static void cpu_ioreq_move(ioreq_t *req)
753 {
754 uint32_t i;
755
756 if (!req->data_is_ptr) {
757 if (req->dir == IOREQ_READ) {
758 for (i = 0; i < req->count; i++) {
759 read_phys_req_item(req->addr, req, i, &req->data);
760 }
761 } else if (req->dir == IOREQ_WRITE) {
762 for (i = 0; i < req->count; i++) {
763 write_phys_req_item(req->addr, req, i, &req->data);
764 }
765 }
766 } else {
767 uint64_t tmp;
768
769 if (req->dir == IOREQ_READ) {
770 for (i = 0; i < req->count; i++) {
771 read_phys_req_item(req->addr, req, i, &tmp);
772 write_phys_req_item(req->data, req, i, &tmp);
773 }
774 } else if (req->dir == IOREQ_WRITE) {
775 for (i = 0; i < req->count; i++) {
776 read_phys_req_item(req->data, req, i, &tmp);
777 write_phys_req_item(req->addr, req, i, &tmp);
778 }
779 }
780 }
781 }
782
783 static void handle_ioreq(ioreq_t *req)
784 {
785 if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
786 (req->size < sizeof (target_ulong))) {
787 req->data &= ((target_ulong) 1 << (8 * req->size)) - 1;
788 }
789
790 switch (req->type) {
791 case IOREQ_TYPE_PIO:
792 cpu_ioreq_pio(req);
793 break;
794 case IOREQ_TYPE_COPY:
795 cpu_ioreq_move(req);
796 break;
797 case IOREQ_TYPE_TIMEOFFSET:
798 break;
799 case IOREQ_TYPE_INVALIDATE:
800 xen_invalidate_map_cache();
801 break;
802 default:
803 hw_error("Invalid ioreq type 0x%x\n", req->type);
804 }
805 }
806
807 static int handle_buffered_iopage(XenIOState *state)
808 {
809 buf_ioreq_t *buf_req = NULL;
810 ioreq_t req;
811 int qw;
812
813 if (!state->buffered_io_page) {
814 return 0;
815 }
816
817 memset(&req, 0x00, sizeof(req));
818
819 while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
820 buf_req = &state->buffered_io_page->buf_ioreq[
821 state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM];
822 req.size = 1UL << buf_req->size;
823 req.count = 1;
824 req.addr = buf_req->addr;
825 req.data = buf_req->data;
826 req.state = STATE_IOREQ_READY;
827 req.dir = buf_req->dir;
828 req.df = 1;
829 req.type = buf_req->type;
830 req.data_is_ptr = 0;
831 qw = (req.size == 8);
832 if (qw) {
833 buf_req = &state->buffered_io_page->buf_ioreq[
834 (state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
835 req.data |= ((uint64_t)buf_req->data) << 32;
836 }
837
838 handle_ioreq(&req);
839
840 xen_mb();
841 state->buffered_io_page->read_pointer += qw ? 2 : 1;
842 }
843
844 return req.count;
845 }
846
847 static void handle_buffered_io(void *opaque)
848 {
849 XenIOState *state = opaque;
850
851 if (handle_buffered_iopage(state)) {
852 qemu_mod_timer(state->buffered_io_timer,
853 BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
854 } else {
855 qemu_del_timer(state->buffered_io_timer);
856 xc_evtchn_unmask(state->xce_handle, state->bufioreq_local_port);
857 }
858 }
859
860 static void cpu_handle_ioreq(void *opaque)
861 {
862 XenIOState *state = opaque;
863 ioreq_t *req = cpu_get_ioreq(state);
864
865 handle_buffered_iopage(state);
866 if (req) {
867 handle_ioreq(req);
868
869 if (req->state != STATE_IOREQ_INPROCESS) {
870 fprintf(stderr, "Badness in I/O request ... not in service?!: "
871 "%x, ptr: %x, port: %"PRIx64", "
872 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
873 req->state, req->data_is_ptr, req->addr,
874 req->data, req->count, req->size);
875 destroy_hvm_domain(false);
876 return;
877 }
878
879 xen_wmb(); /* Update ioreq contents /then/ update state. */
880
881 /*
882 * We do this before we send the response so that the tools
883 * have the opportunity to pick up on the reset before the
884 * guest resumes and does a hlt with interrupts disabled which
885 * causes Xen to powerdown the domain.
886 */
887 if (runstate_is_running()) {
888 if (qemu_shutdown_requested_get()) {
889 destroy_hvm_domain(false);
890 }
891 if (qemu_reset_requested_get()) {
892 qemu_system_reset(VMRESET_REPORT);
893 destroy_hvm_domain(true);
894 }
895 }
896
897 req->state = STATE_IORESP_READY;
898 xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
899 }
900 }
901
902 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
903 {
904 struct xs_handle *xs = NULL;
905 char *path = NULL;
906 char *newpath = NULL;
907 char *pts = NULL;
908 int ret = -1;
909
910 /* Only continue if we're talking to a pty. */
911 if (strncmp(cs->filename, "pty:", 4)) {
912 return 0;
913 }
914 pts = cs->filename + 4;
915
916 /* We now have everything we need to set the xenstore entry. */
917 xs = xs_open(0);
918 if (xs == NULL) {
919 fprintf(stderr, "Could not contact XenStore\n");
920 goto out;
921 }
922
923 path = xs_get_domain_path(xs, domid);
924 if (path == NULL) {
925 fprintf(stderr, "xs_get_domain_path() error\n");
926 goto out;
927 }
928 newpath = realloc(path, (strlen(path) + strlen(string) +
929 strlen("/tty") + 1));
930 if (newpath == NULL) {
931 fprintf(stderr, "realloc error\n");
932 goto out;
933 }
934 path = newpath;
935
936 strcat(path, string);
937 strcat(path, "/tty");
938 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
939 fprintf(stderr, "xs_write for '%s' fail", string);
940 goto out;
941 }
942 ret = 0;
943
944 out:
945 free(path);
946 xs_close(xs);
947
948 return ret;
949 }
950
951 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
952 {
953 if (i == 0) {
954 store_dev_info(xen_domid, chr, "/console");
955 } else {
956 char buf[32];
957 snprintf(buf, sizeof(buf), "/device/console/%d", i);
958 store_dev_info(xen_domid, chr, buf);
959 }
960 }
961
962 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
963 {
964 char path[50];
965
966 if (xs == NULL) {
967 fprintf(stderr, "xenstore connection not initialized\n");
968 exit(1);
969 }
970
971 snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid);
972 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
973 fprintf(stderr, "error recording dm state\n");
974 exit(1);
975 }
976 }
977
978 static void xen_main_loop_prepare(XenIOState *state)
979 {
980 int evtchn_fd = -1;
981
982 if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
983 evtchn_fd = xc_evtchn_fd(state->xce_handle);
984 }
985
986 state->buffered_io_timer = qemu_new_timer_ms(rt_clock, handle_buffered_io,
987 state);
988
989 if (evtchn_fd != -1) {
990 qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
991 }
992 }
993
994
995 /* Initialise Xen */
996
997 static void xen_change_state_handler(void *opaque, int running,
998 RunState state)
999 {
1000 if (running) {
1001 /* record state running */
1002 xenstore_record_dm_state(xenstore, "running");
1003 }
1004 }
1005
1006 static void xen_hvm_change_state_handler(void *opaque, int running,
1007 RunState rstate)
1008 {
1009 XenIOState *xstate = opaque;
1010 if (running) {
1011 xen_main_loop_prepare(xstate);
1012 }
1013 }
1014
1015 static void xen_exit_notifier(Notifier *n, void *data)
1016 {
1017 XenIOState *state = container_of(n, XenIOState, exit);
1018
1019 xc_evtchn_close(state->xce_handle);
1020 xs_daemon_close(state->xenstore);
1021 }
1022
1023 int xen_init(void)
1024 {
1025 xen_xc = xen_xc_interface_open(0, 0, 0);
1026 if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
1027 xen_be_printf(NULL, 0, "can't open xen interface\n");
1028 return -1;
1029 }
1030 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
1031
1032 return 0;
1033 }
1034
1035 static void xen_read_physmap(XenIOState *state)
1036 {
1037 XenPhysmap *physmap = NULL;
1038 unsigned int len, num, i;
1039 char path[80], *value = NULL;
1040 char **entries = NULL;
1041
1042 snprintf(path, sizeof(path),
1043 "/local/domain/0/device-model/%d/physmap", xen_domid);
1044 entries = xs_directory(state->xenstore, 0, path, &num);
1045 if (entries == NULL)
1046 return;
1047
1048 for (i = 0; i < num; i++) {
1049 physmap = g_malloc(sizeof (XenPhysmap));
1050 physmap->phys_offset = strtoull(entries[i], NULL, 16);
1051 snprintf(path, sizeof(path),
1052 "/local/domain/0/device-model/%d/physmap/%s/start_addr",
1053 xen_domid, entries[i]);
1054 value = xs_read(state->xenstore, 0, path, &len);
1055 if (value == NULL) {
1056 free(physmap);
1057 continue;
1058 }
1059 physmap->start_addr = strtoull(value, NULL, 16);
1060 free(value);
1061
1062 snprintf(path, sizeof(path),
1063 "/local/domain/0/device-model/%d/physmap/%s/size",
1064 xen_domid, entries[i]);
1065 value = xs_read(state->xenstore, 0, path, &len);
1066 if (value == NULL) {
1067 free(physmap);
1068 continue;
1069 }
1070 physmap->size = strtoull(value, NULL, 16);
1071 free(value);
1072
1073 snprintf(path, sizeof(path),
1074 "/local/domain/0/device-model/%d/physmap/%s/name",
1075 xen_domid, entries[i]);
1076 physmap->name = xs_read(state->xenstore, 0, path, &len);
1077
1078 QLIST_INSERT_HEAD(&state->physmap, physmap, list);
1079 }
1080 free(entries);
1081 }
1082
1083 int xen_hvm_init(void)
1084 {
1085 int i, rc;
1086 unsigned long ioreq_pfn;
1087 unsigned long bufioreq_evtchn;
1088 XenIOState *state;
1089
1090 state = g_malloc0(sizeof (XenIOState));
1091
1092 state->xce_handle = xen_xc_evtchn_open(NULL, 0);
1093 if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
1094 perror("xen: event channel open");
1095 return -errno;
1096 }
1097
1098 state->xenstore = xs_daemon_open();
1099 if (state->xenstore == NULL) {
1100 perror("xen: xenstore open");
1101 return -errno;
1102 }
1103
1104 state->exit.notify = xen_exit_notifier;
1105 qemu_add_exit_notifier(&state->exit);
1106
1107 state->suspend.notify = xen_suspend_notifier;
1108 qemu_register_suspend_notifier(&state->suspend);
1109
1110 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
1111 DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
1112 state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
1113 PROT_READ|PROT_WRITE, ioreq_pfn);
1114 if (state->shared_page == NULL) {
1115 hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
1116 errno, xen_xc);
1117 }
1118
1119 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
1120 DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
1121 state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
1122 PROT_READ|PROT_WRITE, ioreq_pfn);
1123 if (state->buffered_io_page == NULL) {
1124 hw_error("map buffered IO page returned error %d", errno);
1125 }
1126
1127 state->ioreq_local_port = g_malloc0(smp_cpus * sizeof (evtchn_port_t));
1128
1129 /* FIXME: how about if we overflow the page here? */
1130 for (i = 0; i < smp_cpus; i++) {
1131 rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
1132 xen_vcpu_eport(state->shared_page, i));
1133 if (rc == -1) {
1134 fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
1135 return -1;
1136 }
1137 state->ioreq_local_port[i] = rc;
1138 }
1139
1140 rc = xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_EVTCHN,
1141 &bufioreq_evtchn);
1142 if (rc < 0) {
1143 fprintf(stderr, "failed to get HVM_PARAM_BUFIOREQ_EVTCHN\n");
1144 return -1;
1145 }
1146 rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
1147 (uint32_t)bufioreq_evtchn);
1148 if (rc == -1) {
1149 fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
1150 return -1;
1151 }
1152 state->bufioreq_local_port = rc;
1153
1154 /* Init RAM management */
1155 xen_map_cache_init(xen_phys_offset_to_gaddr, state);
1156 xen_ram_init(ram_size);
1157
1158 qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
1159
1160 state->memory_listener = xen_memory_listener;
1161 QLIST_INIT(&state->physmap);
1162 memory_listener_register(&state->memory_listener, &address_space_memory);
1163 state->log_for_dirtybit = NULL;
1164
1165 /* Initialize backend core & drivers */
1166 if (xen_be_init() != 0) {
1167 fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
1168 exit(1);
1169 }
1170 xen_be_register("console", &xen_console_ops);
1171 xen_be_register("vkbd", &xen_kbdmouse_ops);
1172 xen_be_register("qdisk", &xen_blkdev_ops);
1173 xen_read_physmap(state);
1174
1175 return 0;
1176 }
1177
1178 void destroy_hvm_domain(bool reboot)
1179 {
1180 XenXC xc_handle;
1181 int sts;
1182
1183 xc_handle = xen_xc_interface_open(0, 0, 0);
1184 if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
1185 fprintf(stderr, "Cannot acquire xenctrl handle\n");
1186 } else {
1187 sts = xc_domain_shutdown(xc_handle, xen_domid,
1188 reboot ? SHUTDOWN_reboot : SHUTDOWN_poweroff);
1189 if (sts != 0) {
1190 fprintf(stderr, "xc_domain_shutdown failed to issue %s, "
1191 "sts %d, %s\n", reboot ? "reboot" : "poweroff",
1192 sts, strerror(errno));
1193 } else {
1194 fprintf(stderr, "Issued domain %d %s\n", xen_domid,
1195 reboot ? "reboot" : "poweroff");
1196 }
1197 xc_interface_close(xc_handle);
1198 }
1199 }
1200
1201 void xen_register_framebuffer(MemoryRegion *mr)
1202 {
1203 framebuffer = mr;
1204 }
1205
1206 void xen_shutdown_fatal_error(const char *fmt, ...)
1207 {
1208 va_list ap;
1209
1210 va_start(ap, fmt);
1211 vfprintf(stderr, fmt, ap);
1212 va_end(ap);
1213 fprintf(stderr, "Will destroy the domain.\n");
1214 /* destroy the domain */
1215 qemu_system_shutdown_request();
1216 }
1217
1218 void xen_modified_memory(ram_addr_t start, ram_addr_t length)
1219 {
1220 if (unlikely(xen_in_migration)) {
1221 int rc;
1222 ram_addr_t start_pfn, nb_pages;
1223
1224 if (length == 0) {
1225 length = TARGET_PAGE_SIZE;
1226 }
1227 start_pfn = start >> TARGET_PAGE_BITS;
1228 nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >> TARGET_PAGE_BITS)
1229 - start_pfn;
1230 rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages);
1231 if (rc) {
1232 fprintf(stderr,
1233 "%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i, %s\n",
1234 __func__, start, nb_pages, rc, strerror(-rc));
1235 }
1236 }
1237 }