trap signals for "-serial mon:stdio"
[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/i386/pc.h"
15 #include "hw/xen/xen_common.h"
16 #include "hw/xen/xen_backend.h"
17 #include "qmp-commands.h"
18
19 #include "sysemu/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, NULL, "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, NULL, "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, NULL, "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, NULL, "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 g_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 = int128_get64(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 memory_region_ref(section->mr);
463 xen_set_memory(listener, section, true);
464 }
465
466 static void xen_region_del(MemoryListener *listener,
467 MemoryRegionSection *section)
468 {
469 xen_set_memory(listener, section, false);
470 memory_region_unref(section->mr);
471 }
472
473 static void xen_sync_dirty_bitmap(XenIOState *state,
474 hwaddr start_addr,
475 ram_addr_t size)
476 {
477 hwaddr npages = size >> TARGET_PAGE_BITS;
478 const int width = sizeof(unsigned long) * 8;
479 unsigned long bitmap[(npages + width - 1) / width];
480 int rc, i, j;
481 const XenPhysmap *physmap = NULL;
482
483 physmap = get_physmapping(state, start_addr, size);
484 if (physmap == NULL) {
485 /* not handled */
486 return;
487 }
488
489 if (state->log_for_dirtybit == NULL) {
490 state->log_for_dirtybit = physmap;
491 } else if (state->log_for_dirtybit != physmap) {
492 /* Only one range for dirty bitmap can be tracked. */
493 return;
494 }
495
496 rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
497 start_addr >> TARGET_PAGE_BITS, npages,
498 bitmap);
499 if (rc < 0) {
500 if (rc != -ENODATA) {
501 memory_region_set_dirty(framebuffer, 0, size);
502 DPRINTF("xen: track_dirty_vram failed (0x" TARGET_FMT_plx
503 ", 0x" TARGET_FMT_plx "): %s\n",
504 start_addr, start_addr + size, strerror(-rc));
505 }
506 return;
507 }
508
509 for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
510 unsigned long map = bitmap[i];
511 while (map != 0) {
512 j = ffsl(map) - 1;
513 map &= ~(1ul << j);
514 memory_region_set_dirty(framebuffer,
515 (i * width + j) * TARGET_PAGE_SIZE,
516 TARGET_PAGE_SIZE);
517 };
518 }
519 }
520
521 static void xen_log_start(MemoryListener *listener,
522 MemoryRegionSection *section)
523 {
524 XenIOState *state = container_of(listener, XenIOState, memory_listener);
525
526 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
527 int128_get64(section->size));
528 }
529
530 static void xen_log_stop(MemoryListener *listener, MemoryRegionSection *section)
531 {
532 XenIOState *state = container_of(listener, XenIOState, memory_listener);
533
534 state->log_for_dirtybit = NULL;
535 /* Disable dirty bit tracking */
536 xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
537 }
538
539 static void xen_log_sync(MemoryListener *listener, MemoryRegionSection *section)
540 {
541 XenIOState *state = container_of(listener, XenIOState, memory_listener);
542
543 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
544 int128_get64(section->size));
545 }
546
547 static void xen_log_global_start(MemoryListener *listener)
548 {
549 if (xen_enabled()) {
550 xen_in_migration = true;
551 }
552 }
553
554 static void xen_log_global_stop(MemoryListener *listener)
555 {
556 xen_in_migration = false;
557 }
558
559 static MemoryListener xen_memory_listener = {
560 .region_add = xen_region_add,
561 .region_del = xen_region_del,
562 .log_start = xen_log_start,
563 .log_stop = xen_log_stop,
564 .log_sync = xen_log_sync,
565 .log_global_start = xen_log_global_start,
566 .log_global_stop = xen_log_global_stop,
567 .priority = 10,
568 };
569
570 void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
571 {
572 if (enable) {
573 memory_global_dirty_log_start();
574 } else {
575 memory_global_dirty_log_stop();
576 }
577 }
578
579 /* get the ioreq packets from share mem */
580 static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
581 {
582 ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu);
583
584 if (req->state != STATE_IOREQ_READY) {
585 DPRINTF("I/O request not ready: "
586 "%x, ptr: %x, port: %"PRIx64", "
587 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
588 req->state, req->data_is_ptr, req->addr,
589 req->data, req->count, req->size);
590 return NULL;
591 }
592
593 xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
594
595 req->state = STATE_IOREQ_INPROCESS;
596 return req;
597 }
598
599 /* use poll to get the port notification */
600 /* ioreq_vec--out,the */
601 /* retval--the number of ioreq packet */
602 static ioreq_t *cpu_get_ioreq(XenIOState *state)
603 {
604 int i;
605 evtchn_port_t port;
606
607 port = xc_evtchn_pending(state->xce_handle);
608 if (port == state->bufioreq_local_port) {
609 qemu_mod_timer(state->buffered_io_timer,
610 BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
611 return NULL;
612 }
613
614 if (port != -1) {
615 for (i = 0; i < smp_cpus; i++) {
616 if (state->ioreq_local_port[i] == port) {
617 break;
618 }
619 }
620
621 if (i == smp_cpus) {
622 hw_error("Fatal error while trying to get io event!\n");
623 }
624
625 /* unmask the wanted port again */
626 xc_evtchn_unmask(state->xce_handle, port);
627
628 /* get the io packet from shared memory */
629 state->send_vcpu = i;
630 return cpu_get_ioreq_from_shared_memory(state, i);
631 }
632
633 /* read error or read nothing */
634 return NULL;
635 }
636
637 static uint32_t do_inp(pio_addr_t addr, unsigned long size)
638 {
639 switch (size) {
640 case 1:
641 return cpu_inb(addr);
642 case 2:
643 return cpu_inw(addr);
644 case 4:
645 return cpu_inl(addr);
646 default:
647 hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size);
648 }
649 }
650
651 static void do_outp(pio_addr_t addr,
652 unsigned long size, uint32_t val)
653 {
654 switch (size) {
655 case 1:
656 return cpu_outb(addr, val);
657 case 2:
658 return cpu_outw(addr, val);
659 case 4:
660 return cpu_outl(addr, val);
661 default:
662 hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size);
663 }
664 }
665
666 /*
667 * Helper functions which read/write an object from/to physical guest
668 * memory, as part of the implementation of an ioreq.
669 *
670 * Equivalent to
671 * cpu_physical_memory_rw(addr + (req->df ? -1 : +1) * req->size * i,
672 * val, req->size, 0/1)
673 * except without the integer overflow problems.
674 */
675 static void rw_phys_req_item(hwaddr addr,
676 ioreq_t *req, uint32_t i, void *val, int rw)
677 {
678 /* Do everything unsigned so overflow just results in a truncated result
679 * and accesses to undesired parts of guest memory, which is up
680 * to the guest */
681 hwaddr offset = (hwaddr)req->size * i;
682 if (req->df) {
683 addr -= offset;
684 } else {
685 addr += offset;
686 }
687 cpu_physical_memory_rw(addr, val, req->size, rw);
688 }
689
690 static inline void read_phys_req_item(hwaddr addr,
691 ioreq_t *req, uint32_t i, void *val)
692 {
693 rw_phys_req_item(addr, req, i, val, 0);
694 }
695 static inline void write_phys_req_item(hwaddr addr,
696 ioreq_t *req, uint32_t i, void *val)
697 {
698 rw_phys_req_item(addr, req, i, val, 1);
699 }
700
701
702 static void cpu_ioreq_pio(ioreq_t *req)
703 {
704 uint32_t i;
705
706 if (req->dir == IOREQ_READ) {
707 if (!req->data_is_ptr) {
708 req->data = do_inp(req->addr, req->size);
709 } else {
710 uint32_t tmp;
711
712 for (i = 0; i < req->count; i++) {
713 tmp = do_inp(req->addr, req->size);
714 write_phys_req_item(req->data, req, i, &tmp);
715 }
716 }
717 } else if (req->dir == IOREQ_WRITE) {
718 if (!req->data_is_ptr) {
719 do_outp(req->addr, req->size, req->data);
720 } else {
721 for (i = 0; i < req->count; i++) {
722 uint32_t tmp = 0;
723
724 read_phys_req_item(req->data, req, i, &tmp);
725 do_outp(req->addr, req->size, tmp);
726 }
727 }
728 }
729 }
730
731 static void cpu_ioreq_move(ioreq_t *req)
732 {
733 uint32_t i;
734
735 if (!req->data_is_ptr) {
736 if (req->dir == IOREQ_READ) {
737 for (i = 0; i < req->count; i++) {
738 read_phys_req_item(req->addr, req, i, &req->data);
739 }
740 } else if (req->dir == IOREQ_WRITE) {
741 for (i = 0; i < req->count; i++) {
742 write_phys_req_item(req->addr, req, i, &req->data);
743 }
744 }
745 } else {
746 uint64_t tmp;
747
748 if (req->dir == IOREQ_READ) {
749 for (i = 0; i < req->count; i++) {
750 read_phys_req_item(req->addr, req, i, &tmp);
751 write_phys_req_item(req->data, req, i, &tmp);
752 }
753 } else if (req->dir == IOREQ_WRITE) {
754 for (i = 0; i < req->count; i++) {
755 read_phys_req_item(req->data, req, i, &tmp);
756 write_phys_req_item(req->addr, req, i, &tmp);
757 }
758 }
759 }
760 }
761
762 static void handle_ioreq(ioreq_t *req)
763 {
764 if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
765 (req->size < sizeof (target_ulong))) {
766 req->data &= ((target_ulong) 1 << (8 * req->size)) - 1;
767 }
768
769 switch (req->type) {
770 case IOREQ_TYPE_PIO:
771 cpu_ioreq_pio(req);
772 break;
773 case IOREQ_TYPE_COPY:
774 cpu_ioreq_move(req);
775 break;
776 case IOREQ_TYPE_TIMEOFFSET:
777 break;
778 case IOREQ_TYPE_INVALIDATE:
779 xen_invalidate_map_cache();
780 break;
781 default:
782 hw_error("Invalid ioreq type 0x%x\n", req->type);
783 }
784 }
785
786 static int handle_buffered_iopage(XenIOState *state)
787 {
788 buf_ioreq_t *buf_req = NULL;
789 ioreq_t req;
790 int qw;
791
792 if (!state->buffered_io_page) {
793 return 0;
794 }
795
796 memset(&req, 0x00, sizeof(req));
797
798 while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
799 buf_req = &state->buffered_io_page->buf_ioreq[
800 state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM];
801 req.size = 1UL << buf_req->size;
802 req.count = 1;
803 req.addr = buf_req->addr;
804 req.data = buf_req->data;
805 req.state = STATE_IOREQ_READY;
806 req.dir = buf_req->dir;
807 req.df = 1;
808 req.type = buf_req->type;
809 req.data_is_ptr = 0;
810 qw = (req.size == 8);
811 if (qw) {
812 buf_req = &state->buffered_io_page->buf_ioreq[
813 (state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
814 req.data |= ((uint64_t)buf_req->data) << 32;
815 }
816
817 handle_ioreq(&req);
818
819 xen_mb();
820 state->buffered_io_page->read_pointer += qw ? 2 : 1;
821 }
822
823 return req.count;
824 }
825
826 static void handle_buffered_io(void *opaque)
827 {
828 XenIOState *state = opaque;
829
830 if (handle_buffered_iopage(state)) {
831 qemu_mod_timer(state->buffered_io_timer,
832 BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
833 } else {
834 qemu_del_timer(state->buffered_io_timer);
835 xc_evtchn_unmask(state->xce_handle, state->bufioreq_local_port);
836 }
837 }
838
839 static void cpu_handle_ioreq(void *opaque)
840 {
841 XenIOState *state = opaque;
842 ioreq_t *req = cpu_get_ioreq(state);
843
844 handle_buffered_iopage(state);
845 if (req) {
846 handle_ioreq(req);
847
848 if (req->state != STATE_IOREQ_INPROCESS) {
849 fprintf(stderr, "Badness in I/O request ... not in service?!: "
850 "%x, ptr: %x, port: %"PRIx64", "
851 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
852 req->state, req->data_is_ptr, req->addr,
853 req->data, req->count, req->size);
854 destroy_hvm_domain(false);
855 return;
856 }
857
858 xen_wmb(); /* Update ioreq contents /then/ update state. */
859
860 /*
861 * We do this before we send the response so that the tools
862 * have the opportunity to pick up on the reset before the
863 * guest resumes and does a hlt with interrupts disabled which
864 * causes Xen to powerdown the domain.
865 */
866 if (runstate_is_running()) {
867 if (qemu_shutdown_requested_get()) {
868 destroy_hvm_domain(false);
869 }
870 if (qemu_reset_requested_get()) {
871 qemu_system_reset(VMRESET_REPORT);
872 destroy_hvm_domain(true);
873 }
874 }
875
876 req->state = STATE_IORESP_READY;
877 xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
878 }
879 }
880
881 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
882 {
883 struct xs_handle *xs = NULL;
884 char *path = NULL;
885 char *newpath = NULL;
886 char *pts = NULL;
887 int ret = -1;
888
889 /* Only continue if we're talking to a pty. */
890 if (strncmp(cs->filename, "pty:", 4)) {
891 return 0;
892 }
893 pts = cs->filename + 4;
894
895 /* We now have everything we need to set the xenstore entry. */
896 xs = xs_open(0);
897 if (xs == NULL) {
898 fprintf(stderr, "Could not contact XenStore\n");
899 goto out;
900 }
901
902 path = xs_get_domain_path(xs, domid);
903 if (path == NULL) {
904 fprintf(stderr, "xs_get_domain_path() error\n");
905 goto out;
906 }
907 newpath = realloc(path, (strlen(path) + strlen(string) +
908 strlen("/tty") + 1));
909 if (newpath == NULL) {
910 fprintf(stderr, "realloc error\n");
911 goto out;
912 }
913 path = newpath;
914
915 strcat(path, string);
916 strcat(path, "/tty");
917 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
918 fprintf(stderr, "xs_write for '%s' fail", string);
919 goto out;
920 }
921 ret = 0;
922
923 out:
924 free(path);
925 xs_close(xs);
926
927 return ret;
928 }
929
930 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
931 {
932 if (i == 0) {
933 store_dev_info(xen_domid, chr, "/console");
934 } else {
935 char buf[32];
936 snprintf(buf, sizeof(buf), "/device/console/%d", i);
937 store_dev_info(xen_domid, chr, buf);
938 }
939 }
940
941 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
942 {
943 char path[50];
944
945 if (xs == NULL) {
946 fprintf(stderr, "xenstore connection not initialized\n");
947 exit(1);
948 }
949
950 snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid);
951 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
952 fprintf(stderr, "error recording dm state\n");
953 exit(1);
954 }
955 }
956
957 static void xen_main_loop_prepare(XenIOState *state)
958 {
959 int evtchn_fd = -1;
960
961 if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
962 evtchn_fd = xc_evtchn_fd(state->xce_handle);
963 }
964
965 state->buffered_io_timer = qemu_new_timer_ms(rt_clock, handle_buffered_io,
966 state);
967
968 if (evtchn_fd != -1) {
969 qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
970 }
971 }
972
973
974 /* Initialise Xen */
975
976 static void xen_change_state_handler(void *opaque, int running,
977 RunState state)
978 {
979 if (running) {
980 /* record state running */
981 xenstore_record_dm_state(xenstore, "running");
982 }
983 }
984
985 static void xen_hvm_change_state_handler(void *opaque, int running,
986 RunState rstate)
987 {
988 XenIOState *xstate = opaque;
989 if (running) {
990 xen_main_loop_prepare(xstate);
991 }
992 }
993
994 static void xen_exit_notifier(Notifier *n, void *data)
995 {
996 XenIOState *state = container_of(n, XenIOState, exit);
997
998 xc_evtchn_close(state->xce_handle);
999 xs_daemon_close(state->xenstore);
1000 }
1001
1002 int xen_init(void)
1003 {
1004 xen_xc = xen_xc_interface_open(0, 0, 0);
1005 if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
1006 xen_be_printf(NULL, 0, "can't open xen interface\n");
1007 return -1;
1008 }
1009 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
1010
1011 return 0;
1012 }
1013
1014 static void xen_read_physmap(XenIOState *state)
1015 {
1016 XenPhysmap *physmap = NULL;
1017 unsigned int len, num, i;
1018 char path[80], *value = NULL;
1019 char **entries = NULL;
1020
1021 snprintf(path, sizeof(path),
1022 "/local/domain/0/device-model/%d/physmap", xen_domid);
1023 entries = xs_directory(state->xenstore, 0, path, &num);
1024 if (entries == NULL)
1025 return;
1026
1027 for (i = 0; i < num; i++) {
1028 physmap = g_malloc(sizeof (XenPhysmap));
1029 physmap->phys_offset = strtoull(entries[i], NULL, 16);
1030 snprintf(path, sizeof(path),
1031 "/local/domain/0/device-model/%d/physmap/%s/start_addr",
1032 xen_domid, entries[i]);
1033 value = xs_read(state->xenstore, 0, path, &len);
1034 if (value == NULL) {
1035 g_free(physmap);
1036 continue;
1037 }
1038 physmap->start_addr = strtoull(value, NULL, 16);
1039 free(value);
1040
1041 snprintf(path, sizeof(path),
1042 "/local/domain/0/device-model/%d/physmap/%s/size",
1043 xen_domid, entries[i]);
1044 value = xs_read(state->xenstore, 0, path, &len);
1045 if (value == NULL) {
1046 g_free(physmap);
1047 continue;
1048 }
1049 physmap->size = strtoull(value, NULL, 16);
1050 free(value);
1051
1052 snprintf(path, sizeof(path),
1053 "/local/domain/0/device-model/%d/physmap/%s/name",
1054 xen_domid, entries[i]);
1055 physmap->name = xs_read(state->xenstore, 0, path, &len);
1056
1057 QLIST_INSERT_HEAD(&state->physmap, physmap, list);
1058 }
1059 free(entries);
1060 }
1061
1062 int xen_hvm_init(void)
1063 {
1064 int i, rc;
1065 unsigned long ioreq_pfn;
1066 unsigned long bufioreq_evtchn;
1067 XenIOState *state;
1068
1069 state = g_malloc0(sizeof (XenIOState));
1070
1071 state->xce_handle = xen_xc_evtchn_open(NULL, 0);
1072 if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
1073 perror("xen: event channel open");
1074 g_free(state);
1075 return -errno;
1076 }
1077
1078 state->xenstore = xs_daemon_open();
1079 if (state->xenstore == NULL) {
1080 perror("xen: xenstore open");
1081 g_free(state);
1082 return -errno;
1083 }
1084
1085 state->exit.notify = xen_exit_notifier;
1086 qemu_add_exit_notifier(&state->exit);
1087
1088 state->suspend.notify = xen_suspend_notifier;
1089 qemu_register_suspend_notifier(&state->suspend);
1090
1091 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
1092 DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
1093 state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
1094 PROT_READ|PROT_WRITE, ioreq_pfn);
1095 if (state->shared_page == NULL) {
1096 hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
1097 errno, xen_xc);
1098 }
1099
1100 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
1101 DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
1102 state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
1103 PROT_READ|PROT_WRITE, ioreq_pfn);
1104 if (state->buffered_io_page == NULL) {
1105 hw_error("map buffered IO page returned error %d", errno);
1106 }
1107
1108 state->ioreq_local_port = g_malloc0(smp_cpus * sizeof (evtchn_port_t));
1109
1110 /* FIXME: how about if we overflow the page here? */
1111 for (i = 0; i < smp_cpus; i++) {
1112 rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
1113 xen_vcpu_eport(state->shared_page, i));
1114 if (rc == -1) {
1115 fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
1116 return -1;
1117 }
1118 state->ioreq_local_port[i] = rc;
1119 }
1120
1121 rc = xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_EVTCHN,
1122 &bufioreq_evtchn);
1123 if (rc < 0) {
1124 fprintf(stderr, "failed to get HVM_PARAM_BUFIOREQ_EVTCHN\n");
1125 return -1;
1126 }
1127 rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
1128 (uint32_t)bufioreq_evtchn);
1129 if (rc == -1) {
1130 fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
1131 return -1;
1132 }
1133 state->bufioreq_local_port = rc;
1134
1135 /* Init RAM management */
1136 xen_map_cache_init(xen_phys_offset_to_gaddr, state);
1137 xen_ram_init(ram_size);
1138
1139 qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
1140
1141 state->memory_listener = xen_memory_listener;
1142 QLIST_INIT(&state->physmap);
1143 memory_listener_register(&state->memory_listener, &address_space_memory);
1144 state->log_for_dirtybit = NULL;
1145
1146 /* Initialize backend core & drivers */
1147 if (xen_be_init() != 0) {
1148 fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
1149 exit(1);
1150 }
1151 xen_be_register("console", &xen_console_ops);
1152 xen_be_register("vkbd", &xen_kbdmouse_ops);
1153 xen_be_register("qdisk", &xen_blkdev_ops);
1154 xen_read_physmap(state);
1155
1156 return 0;
1157 }
1158
1159 void destroy_hvm_domain(bool reboot)
1160 {
1161 XenXC xc_handle;
1162 int sts;
1163
1164 xc_handle = xen_xc_interface_open(0, 0, 0);
1165 if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
1166 fprintf(stderr, "Cannot acquire xenctrl handle\n");
1167 } else {
1168 sts = xc_domain_shutdown(xc_handle, xen_domid,
1169 reboot ? SHUTDOWN_reboot : SHUTDOWN_poweroff);
1170 if (sts != 0) {
1171 fprintf(stderr, "xc_domain_shutdown failed to issue %s, "
1172 "sts %d, %s\n", reboot ? "reboot" : "poweroff",
1173 sts, strerror(errno));
1174 } else {
1175 fprintf(stderr, "Issued domain %d %s\n", xen_domid,
1176 reboot ? "reboot" : "poweroff");
1177 }
1178 xc_interface_close(xc_handle);
1179 }
1180 }
1181
1182 void xen_register_framebuffer(MemoryRegion *mr)
1183 {
1184 framebuffer = mr;
1185 }
1186
1187 void xen_shutdown_fatal_error(const char *fmt, ...)
1188 {
1189 va_list ap;
1190
1191 va_start(ap, fmt);
1192 vfprintf(stderr, fmt, ap);
1193 va_end(ap);
1194 fprintf(stderr, "Will destroy the domain.\n");
1195 /* destroy the domain */
1196 qemu_system_shutdown_request();
1197 }
1198
1199 void xen_modified_memory(ram_addr_t start, ram_addr_t length)
1200 {
1201 if (unlikely(xen_in_migration)) {
1202 int rc;
1203 ram_addr_t start_pfn, nb_pages;
1204
1205 if (length == 0) {
1206 length = TARGET_PAGE_SIZE;
1207 }
1208 start_pfn = start >> TARGET_PAGE_BITS;
1209 nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >> TARGET_PAGE_BITS)
1210 - start_pfn;
1211 rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages);
1212 if (rc) {
1213 fprintf(stderr,
1214 "%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i, %s\n",
1215 __func__, start, nb_pages, rc, strerror(-rc));
1216 }
1217 }
1218 }