Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
[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 Notifier wakeup;
102 } XenIOState;
103
104 /* Xen specific function for piix pci */
105
106 int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
107 {
108 return irq_num + ((pci_dev->devfn >> 3) << 2);
109 }
110
111 void xen_piix3_set_irq(void *opaque, int irq_num, int level)
112 {
113 xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2,
114 irq_num & 3, level);
115 }
116
117 void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
118 {
119 int i;
120
121 /* Scan for updates to PCI link routes (0x60-0x63). */
122 for (i = 0; i < len; i++) {
123 uint8_t v = (val >> (8 * i)) & 0xff;
124 if (v & 0x80) {
125 v = 0;
126 }
127 v &= 0xf;
128 if (((address + i) >= 0x60) && ((address + i) <= 0x63)) {
129 xc_hvm_set_pci_link_route(xen_xc, xen_domid, address + i - 0x60, v);
130 }
131 }
132 }
133
134 void xen_hvm_inject_msi(uint64_t addr, uint32_t data)
135 {
136 xen_xc_hvm_inject_msi(xen_xc, xen_domid, addr, data);
137 }
138
139 static void xen_suspend_notifier(Notifier *notifier, void *data)
140 {
141 xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 3);
142 }
143
144 /* Xen Interrupt Controller */
145
146 static void xen_set_irq(void *opaque, int irq, int level)
147 {
148 xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
149 }
150
151 qemu_irq *xen_interrupt_controller_init(void)
152 {
153 return qemu_allocate_irqs(xen_set_irq, NULL, 16);
154 }
155
156 /* Memory Ops */
157
158 static void xen_ram_init(ram_addr_t ram_size, MemoryRegion **ram_memory_p)
159 {
160 MemoryRegion *sysmem = get_system_memory();
161 ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
162 ram_addr_t block_len;
163
164 block_len = ram_size;
165 if (ram_size >= HVM_BELOW_4G_RAM_END) {
166 /* Xen does not allocate the memory continuously, and keep a hole at
167 * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
168 */
169 block_len += HVM_BELOW_4G_MMIO_LENGTH;
170 }
171 memory_region_init_ram(&ram_memory, NULL, "xen.ram", block_len);
172 *ram_memory_p = &ram_memory;
173 vmstate_register_ram_global(&ram_memory);
174
175 if (ram_size >= HVM_BELOW_4G_RAM_END) {
176 above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
177 below_4g_mem_size = HVM_BELOW_4G_RAM_END;
178 } else {
179 below_4g_mem_size = ram_size;
180 }
181
182 memory_region_init_alias(&ram_640k, NULL, "xen.ram.640k",
183 &ram_memory, 0, 0xa0000);
184 memory_region_add_subregion(sysmem, 0, &ram_640k);
185 /* Skip of the VGA IO memory space, it will be registered later by the VGA
186 * emulated device.
187 *
188 * The area between 0xc0000 and 0x100000 will be used by SeaBIOS to load
189 * the Options ROM, so it is registered here as RAM.
190 */
191 memory_region_init_alias(&ram_lo, NULL, "xen.ram.lo",
192 &ram_memory, 0xc0000, below_4g_mem_size - 0xc0000);
193 memory_region_add_subregion(sysmem, 0xc0000, &ram_lo);
194 if (above_4g_mem_size > 0) {
195 memory_region_init_alias(&ram_hi, NULL, "xen.ram.hi",
196 &ram_memory, 0x100000000ULL,
197 above_4g_mem_size);
198 memory_region_add_subregion(sysmem, 0x100000000ULL, &ram_hi);
199 }
200 }
201
202 void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
203 {
204 unsigned long nr_pfn;
205 xen_pfn_t *pfn_list;
206 int i;
207
208 if (runstate_check(RUN_STATE_INMIGRATE)) {
209 /* RAM already populated in Xen */
210 fprintf(stderr, "%s: do not alloc "RAM_ADDR_FMT
211 " bytes of ram at "RAM_ADDR_FMT" when runstate is INMIGRATE\n",
212 __func__, size, ram_addr);
213 return;
214 }
215
216 if (mr == &ram_memory) {
217 return;
218 }
219
220 trace_xen_ram_alloc(ram_addr, size);
221
222 nr_pfn = size >> TARGET_PAGE_BITS;
223 pfn_list = g_malloc(sizeof (*pfn_list) * nr_pfn);
224
225 for (i = 0; i < nr_pfn; i++) {
226 pfn_list[i] = (ram_addr >> TARGET_PAGE_BITS) + i;
227 }
228
229 if (xc_domain_populate_physmap_exact(xen_xc, xen_domid, nr_pfn, 0, 0, pfn_list)) {
230 hw_error("xen: failed to populate ram at " RAM_ADDR_FMT, ram_addr);
231 }
232
233 g_free(pfn_list);
234 }
235
236 static XenPhysmap *get_physmapping(XenIOState *state,
237 hwaddr start_addr, ram_addr_t size)
238 {
239 XenPhysmap *physmap = NULL;
240
241 start_addr &= TARGET_PAGE_MASK;
242
243 QLIST_FOREACH(physmap, &state->physmap, list) {
244 if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) {
245 return physmap;
246 }
247 }
248 return NULL;
249 }
250
251 static hwaddr xen_phys_offset_to_gaddr(hwaddr start_addr,
252 ram_addr_t size, void *opaque)
253 {
254 hwaddr addr = start_addr & TARGET_PAGE_MASK;
255 XenIOState *xen_io_state = opaque;
256 XenPhysmap *physmap = NULL;
257
258 QLIST_FOREACH(physmap, &xen_io_state->physmap, list) {
259 if (range_covers_byte(physmap->phys_offset, physmap->size, addr)) {
260 return physmap->start_addr;
261 }
262 }
263
264 return start_addr;
265 }
266
267 #if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
268 static int xen_add_to_physmap(XenIOState *state,
269 hwaddr start_addr,
270 ram_addr_t size,
271 MemoryRegion *mr,
272 hwaddr offset_within_region)
273 {
274 unsigned long i = 0;
275 int rc = 0;
276 XenPhysmap *physmap = NULL;
277 hwaddr pfn, start_gpfn;
278 hwaddr phys_offset = memory_region_get_ram_addr(mr);
279 char path[80], value[17];
280
281 if (get_physmapping(state, start_addr, size)) {
282 return 0;
283 }
284 if (size <= 0) {
285 return -1;
286 }
287
288 /* Xen can only handle a single dirty log region for now and we want
289 * the linear framebuffer to be that region.
290 * Avoid tracking any regions that is not videoram and avoid tracking
291 * the legacy vga region. */
292 if (mr == framebuffer && start_addr > 0xbffff) {
293 goto go_physmap;
294 }
295 return -1;
296
297 go_physmap:
298 DPRINTF("mapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx"\n",
299 start_addr, start_addr + size);
300
301 pfn = phys_offset >> TARGET_PAGE_BITS;
302 start_gpfn = start_addr >> TARGET_PAGE_BITS;
303 for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
304 unsigned long idx = pfn + i;
305 xen_pfn_t gpfn = start_gpfn + i;
306
307 rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
308 if (rc) {
309 DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
310 PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
311 return -rc;
312 }
313 }
314
315 physmap = g_malloc(sizeof (XenPhysmap));
316
317 physmap->start_addr = start_addr;
318 physmap->size = size;
319 physmap->name = (char *)mr->name;
320 physmap->phys_offset = phys_offset;
321
322 QLIST_INSERT_HEAD(&state->physmap, physmap, list);
323
324 xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
325 start_addr >> TARGET_PAGE_BITS,
326 (start_addr + size) >> TARGET_PAGE_BITS,
327 XEN_DOMCTL_MEM_CACHEATTR_WB);
328
329 snprintf(path, sizeof(path),
330 "/local/domain/0/device-model/%d/physmap/%"PRIx64"/start_addr",
331 xen_domid, (uint64_t)phys_offset);
332 snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)start_addr);
333 if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
334 return -1;
335 }
336 snprintf(path, sizeof(path),
337 "/local/domain/0/device-model/%d/physmap/%"PRIx64"/size",
338 xen_domid, (uint64_t)phys_offset);
339 snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)size);
340 if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
341 return -1;
342 }
343 if (mr->name) {
344 snprintf(path, sizeof(path),
345 "/local/domain/0/device-model/%d/physmap/%"PRIx64"/name",
346 xen_domid, (uint64_t)phys_offset);
347 if (!xs_write(state->xenstore, 0, path, mr->name, strlen(mr->name))) {
348 return -1;
349 }
350 }
351
352 return 0;
353 }
354
355 static int xen_remove_from_physmap(XenIOState *state,
356 hwaddr start_addr,
357 ram_addr_t size)
358 {
359 unsigned long i = 0;
360 int rc = 0;
361 XenPhysmap *physmap = NULL;
362 hwaddr phys_offset = 0;
363
364 physmap = get_physmapping(state, start_addr, size);
365 if (physmap == NULL) {
366 return -1;
367 }
368
369 phys_offset = physmap->phys_offset;
370 size = physmap->size;
371
372 DPRINTF("unmapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx", at "
373 "%"HWADDR_PRIx"\n", start_addr, start_addr + size, phys_offset);
374
375 size >>= TARGET_PAGE_BITS;
376 start_addr >>= TARGET_PAGE_BITS;
377 phys_offset >>= TARGET_PAGE_BITS;
378 for (i = 0; i < size; i++) {
379 unsigned long idx = start_addr + i;
380 xen_pfn_t gpfn = phys_offset + i;
381
382 rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
383 if (rc) {
384 fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
385 PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
386 return -rc;
387 }
388 }
389
390 QLIST_REMOVE(physmap, list);
391 if (state->log_for_dirtybit == physmap) {
392 state->log_for_dirtybit = NULL;
393 }
394 g_free(physmap);
395
396 return 0;
397 }
398
399 #else
400 static int xen_add_to_physmap(XenIOState *state,
401 hwaddr start_addr,
402 ram_addr_t size,
403 MemoryRegion *mr,
404 hwaddr offset_within_region)
405 {
406 return -ENOSYS;
407 }
408
409 static int xen_remove_from_physmap(XenIOState *state,
410 hwaddr start_addr,
411 ram_addr_t size)
412 {
413 return -ENOSYS;
414 }
415 #endif
416
417 static void xen_set_memory(struct MemoryListener *listener,
418 MemoryRegionSection *section,
419 bool add)
420 {
421 XenIOState *state = container_of(listener, XenIOState, memory_listener);
422 hwaddr start_addr = section->offset_within_address_space;
423 ram_addr_t size = int128_get64(section->size);
424 bool log_dirty = memory_region_is_logging(section->mr);
425 hvmmem_type_t mem_type;
426
427 if (!memory_region_is_ram(section->mr)) {
428 return;
429 }
430
431 if (!(section->mr != &ram_memory
432 && ( (log_dirty && add) || (!log_dirty && !add)))) {
433 return;
434 }
435
436 trace_xen_client_set_memory(start_addr, size, log_dirty);
437
438 start_addr &= TARGET_PAGE_MASK;
439 size = TARGET_PAGE_ALIGN(size);
440
441 if (add) {
442 if (!memory_region_is_rom(section->mr)) {
443 xen_add_to_physmap(state, start_addr, size,
444 section->mr, section->offset_within_region);
445 } else {
446 mem_type = HVMMEM_ram_ro;
447 if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
448 start_addr >> TARGET_PAGE_BITS,
449 size >> TARGET_PAGE_BITS)) {
450 DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n",
451 start_addr);
452 }
453 }
454 } else {
455 if (xen_remove_from_physmap(state, start_addr, size) < 0) {
456 DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n", start_addr);
457 }
458 }
459 }
460
461 static void xen_region_add(MemoryListener *listener,
462 MemoryRegionSection *section)
463 {
464 memory_region_ref(section->mr);
465 xen_set_memory(listener, section, true);
466 }
467
468 static void xen_region_del(MemoryListener *listener,
469 MemoryRegionSection *section)
470 {
471 xen_set_memory(listener, section, false);
472 memory_region_unref(section->mr);
473 }
474
475 static void xen_sync_dirty_bitmap(XenIOState *state,
476 hwaddr start_addr,
477 ram_addr_t size)
478 {
479 hwaddr npages = size >> TARGET_PAGE_BITS;
480 const int width = sizeof(unsigned long) * 8;
481 unsigned long bitmap[(npages + width - 1) / width];
482 int rc, i, j;
483 const XenPhysmap *physmap = NULL;
484
485 physmap = get_physmapping(state, start_addr, size);
486 if (physmap == NULL) {
487 /* not handled */
488 return;
489 }
490
491 if (state->log_for_dirtybit == NULL) {
492 state->log_for_dirtybit = physmap;
493 } else if (state->log_for_dirtybit != physmap) {
494 /* Only one range for dirty bitmap can be tracked. */
495 return;
496 }
497
498 rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
499 start_addr >> TARGET_PAGE_BITS, npages,
500 bitmap);
501 if (rc < 0) {
502 if (rc != -ENODATA) {
503 memory_region_set_dirty(framebuffer, 0, size);
504 DPRINTF("xen: track_dirty_vram failed (0x" TARGET_FMT_plx
505 ", 0x" TARGET_FMT_plx "): %s\n",
506 start_addr, start_addr + size, strerror(-rc));
507 }
508 return;
509 }
510
511 for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
512 unsigned long map = bitmap[i];
513 while (map != 0) {
514 j = ffsl(map) - 1;
515 map &= ~(1ul << j);
516 memory_region_set_dirty(framebuffer,
517 (i * width + j) * TARGET_PAGE_SIZE,
518 TARGET_PAGE_SIZE);
519 };
520 }
521 }
522
523 static void xen_log_start(MemoryListener *listener,
524 MemoryRegionSection *section)
525 {
526 XenIOState *state = container_of(listener, XenIOState, memory_listener);
527
528 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
529 int128_get64(section->size));
530 }
531
532 static void xen_log_stop(MemoryListener *listener, MemoryRegionSection *section)
533 {
534 XenIOState *state = container_of(listener, XenIOState, memory_listener);
535
536 state->log_for_dirtybit = NULL;
537 /* Disable dirty bit tracking */
538 xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
539 }
540
541 static void xen_log_sync(MemoryListener *listener, MemoryRegionSection *section)
542 {
543 XenIOState *state = container_of(listener, XenIOState, memory_listener);
544
545 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
546 int128_get64(section->size));
547 }
548
549 static void xen_log_global_start(MemoryListener *listener)
550 {
551 if (xen_enabled()) {
552 xen_in_migration = true;
553 }
554 }
555
556 static void xen_log_global_stop(MemoryListener *listener)
557 {
558 xen_in_migration = false;
559 }
560
561 static MemoryListener xen_memory_listener = {
562 .region_add = xen_region_add,
563 .region_del = xen_region_del,
564 .log_start = xen_log_start,
565 .log_stop = xen_log_stop,
566 .log_sync = xen_log_sync,
567 .log_global_start = xen_log_global_start,
568 .log_global_stop = xen_log_global_stop,
569 .priority = 10,
570 };
571
572 void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
573 {
574 if (enable) {
575 memory_global_dirty_log_start();
576 } else {
577 memory_global_dirty_log_stop();
578 }
579 }
580
581 /* get the ioreq packets from share mem */
582 static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
583 {
584 ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu);
585
586 if (req->state != STATE_IOREQ_READY) {
587 DPRINTF("I/O request not ready: "
588 "%x, ptr: %x, port: %"PRIx64", "
589 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
590 req->state, req->data_is_ptr, req->addr,
591 req->data, req->count, req->size);
592 return NULL;
593 }
594
595 xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
596
597 req->state = STATE_IOREQ_INPROCESS;
598 return req;
599 }
600
601 /* use poll to get the port notification */
602 /* ioreq_vec--out,the */
603 /* retval--the number of ioreq packet */
604 static ioreq_t *cpu_get_ioreq(XenIOState *state)
605 {
606 int i;
607 evtchn_port_t port;
608
609 port = xc_evtchn_pending(state->xce_handle);
610 if (port == state->bufioreq_local_port) {
611 timer_mod(state->buffered_io_timer,
612 BUFFER_IO_MAX_DELAY + qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
613 return NULL;
614 }
615
616 if (port != -1) {
617 for (i = 0; i < max_cpus; i++) {
618 if (state->ioreq_local_port[i] == port) {
619 break;
620 }
621 }
622
623 if (i == max_cpus) {
624 hw_error("Fatal error while trying to get io event!\n");
625 }
626
627 /* unmask the wanted port again */
628 xc_evtchn_unmask(state->xce_handle, port);
629
630 /* get the io packet from shared memory */
631 state->send_vcpu = i;
632 return cpu_get_ioreq_from_shared_memory(state, i);
633 }
634
635 /* read error or read nothing */
636 return NULL;
637 }
638
639 static uint32_t do_inp(pio_addr_t addr, unsigned long size)
640 {
641 switch (size) {
642 case 1:
643 return cpu_inb(addr);
644 case 2:
645 return cpu_inw(addr);
646 case 4:
647 return cpu_inl(addr);
648 default:
649 hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size);
650 }
651 }
652
653 static void do_outp(pio_addr_t addr,
654 unsigned long size, uint32_t val)
655 {
656 switch (size) {
657 case 1:
658 return cpu_outb(addr, val);
659 case 2:
660 return cpu_outw(addr, val);
661 case 4:
662 return cpu_outl(addr, val);
663 default:
664 hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size);
665 }
666 }
667
668 /*
669 * Helper functions which read/write an object from/to physical guest
670 * memory, as part of the implementation of an ioreq.
671 *
672 * Equivalent to
673 * cpu_physical_memory_rw(addr + (req->df ? -1 : +1) * req->size * i,
674 * val, req->size, 0/1)
675 * except without the integer overflow problems.
676 */
677 static void rw_phys_req_item(hwaddr addr,
678 ioreq_t *req, uint32_t i, void *val, int rw)
679 {
680 /* Do everything unsigned so overflow just results in a truncated result
681 * and accesses to undesired parts of guest memory, which is up
682 * to the guest */
683 hwaddr offset = (hwaddr)req->size * i;
684 if (req->df) {
685 addr -= offset;
686 } else {
687 addr += offset;
688 }
689 cpu_physical_memory_rw(addr, val, req->size, rw);
690 }
691
692 static inline void read_phys_req_item(hwaddr addr,
693 ioreq_t *req, uint32_t i, void *val)
694 {
695 rw_phys_req_item(addr, req, i, val, 0);
696 }
697 static inline void write_phys_req_item(hwaddr addr,
698 ioreq_t *req, uint32_t i, void *val)
699 {
700 rw_phys_req_item(addr, req, i, val, 1);
701 }
702
703
704 static void cpu_ioreq_pio(ioreq_t *req)
705 {
706 uint32_t i;
707
708 if (req->dir == IOREQ_READ) {
709 if (!req->data_is_ptr) {
710 req->data = do_inp(req->addr, req->size);
711 } else {
712 uint32_t tmp;
713
714 for (i = 0; i < req->count; i++) {
715 tmp = do_inp(req->addr, req->size);
716 write_phys_req_item(req->data, req, i, &tmp);
717 }
718 }
719 } else if (req->dir == IOREQ_WRITE) {
720 if (!req->data_is_ptr) {
721 do_outp(req->addr, req->size, req->data);
722 } else {
723 for (i = 0; i < req->count; i++) {
724 uint32_t tmp = 0;
725
726 read_phys_req_item(req->data, req, i, &tmp);
727 do_outp(req->addr, req->size, tmp);
728 }
729 }
730 }
731 }
732
733 static void cpu_ioreq_move(ioreq_t *req)
734 {
735 uint32_t i;
736
737 if (!req->data_is_ptr) {
738 if (req->dir == IOREQ_READ) {
739 for (i = 0; i < req->count; i++) {
740 read_phys_req_item(req->addr, req, i, &req->data);
741 }
742 } else if (req->dir == IOREQ_WRITE) {
743 for (i = 0; i < req->count; i++) {
744 write_phys_req_item(req->addr, req, i, &req->data);
745 }
746 }
747 } else {
748 uint64_t tmp;
749
750 if (req->dir == IOREQ_READ) {
751 for (i = 0; i < req->count; i++) {
752 read_phys_req_item(req->addr, req, i, &tmp);
753 write_phys_req_item(req->data, req, i, &tmp);
754 }
755 } else if (req->dir == IOREQ_WRITE) {
756 for (i = 0; i < req->count; i++) {
757 read_phys_req_item(req->data, req, i, &tmp);
758 write_phys_req_item(req->addr, req, i, &tmp);
759 }
760 }
761 }
762 }
763
764 static void handle_ioreq(ioreq_t *req)
765 {
766 if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
767 (req->size < sizeof (target_ulong))) {
768 req->data &= ((target_ulong) 1 << (8 * req->size)) - 1;
769 }
770
771 switch (req->type) {
772 case IOREQ_TYPE_PIO:
773 cpu_ioreq_pio(req);
774 break;
775 case IOREQ_TYPE_COPY:
776 cpu_ioreq_move(req);
777 break;
778 case IOREQ_TYPE_TIMEOFFSET:
779 break;
780 case IOREQ_TYPE_INVALIDATE:
781 xen_invalidate_map_cache();
782 break;
783 default:
784 hw_error("Invalid ioreq type 0x%x\n", req->type);
785 }
786 }
787
788 static int handle_buffered_iopage(XenIOState *state)
789 {
790 buf_ioreq_t *buf_req = NULL;
791 ioreq_t req;
792 int qw;
793
794 if (!state->buffered_io_page) {
795 return 0;
796 }
797
798 memset(&req, 0x00, sizeof(req));
799
800 while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
801 buf_req = &state->buffered_io_page->buf_ioreq[
802 state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM];
803 req.size = 1UL << buf_req->size;
804 req.count = 1;
805 req.addr = buf_req->addr;
806 req.data = buf_req->data;
807 req.state = STATE_IOREQ_READY;
808 req.dir = buf_req->dir;
809 req.df = 1;
810 req.type = buf_req->type;
811 req.data_is_ptr = 0;
812 qw = (req.size == 8);
813 if (qw) {
814 buf_req = &state->buffered_io_page->buf_ioreq[
815 (state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
816 req.data |= ((uint64_t)buf_req->data) << 32;
817 }
818
819 handle_ioreq(&req);
820
821 xen_mb();
822 state->buffered_io_page->read_pointer += qw ? 2 : 1;
823 }
824
825 return req.count;
826 }
827
828 static void handle_buffered_io(void *opaque)
829 {
830 XenIOState *state = opaque;
831
832 if (handle_buffered_iopage(state)) {
833 timer_mod(state->buffered_io_timer,
834 BUFFER_IO_MAX_DELAY + qemu_clock_get_ms(QEMU_CLOCK_REALTIME));
835 } else {
836 timer_del(state->buffered_io_timer);
837 xc_evtchn_unmask(state->xce_handle, state->bufioreq_local_port);
838 }
839 }
840
841 static void cpu_handle_ioreq(void *opaque)
842 {
843 XenIOState *state = opaque;
844 ioreq_t *req = cpu_get_ioreq(state);
845
846 handle_buffered_iopage(state);
847 if (req) {
848 handle_ioreq(req);
849
850 if (req->state != STATE_IOREQ_INPROCESS) {
851 fprintf(stderr, "Badness in I/O request ... not in service?!: "
852 "%x, ptr: %x, port: %"PRIx64", "
853 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
854 req->state, req->data_is_ptr, req->addr,
855 req->data, req->count, req->size);
856 destroy_hvm_domain(false);
857 return;
858 }
859
860 xen_wmb(); /* Update ioreq contents /then/ update state. */
861
862 /*
863 * We do this before we send the response so that the tools
864 * have the opportunity to pick up on the reset before the
865 * guest resumes and does a hlt with interrupts disabled which
866 * causes Xen to powerdown the domain.
867 */
868 if (runstate_is_running()) {
869 if (qemu_shutdown_requested_get()) {
870 destroy_hvm_domain(false);
871 }
872 if (qemu_reset_requested_get()) {
873 qemu_system_reset(VMRESET_REPORT);
874 destroy_hvm_domain(true);
875 }
876 }
877
878 req->state = STATE_IORESP_READY;
879 xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
880 }
881 }
882
883 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
884 {
885 struct xs_handle *xs = NULL;
886 char *path = NULL;
887 char *newpath = NULL;
888 char *pts = NULL;
889 int ret = -1;
890
891 /* Only continue if we're talking to a pty. */
892 if (strncmp(cs->filename, "pty:", 4)) {
893 return 0;
894 }
895 pts = cs->filename + 4;
896
897 /* We now have everything we need to set the xenstore entry. */
898 xs = xs_open(0);
899 if (xs == NULL) {
900 fprintf(stderr, "Could not contact XenStore\n");
901 goto out;
902 }
903
904 path = xs_get_domain_path(xs, domid);
905 if (path == NULL) {
906 fprintf(stderr, "xs_get_domain_path() error\n");
907 goto out;
908 }
909 newpath = realloc(path, (strlen(path) + strlen(string) +
910 strlen("/tty") + 1));
911 if (newpath == NULL) {
912 fprintf(stderr, "realloc error\n");
913 goto out;
914 }
915 path = newpath;
916
917 strcat(path, string);
918 strcat(path, "/tty");
919 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
920 fprintf(stderr, "xs_write for '%s' fail", string);
921 goto out;
922 }
923 ret = 0;
924
925 out:
926 free(path);
927 xs_close(xs);
928
929 return ret;
930 }
931
932 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
933 {
934 if (i == 0) {
935 store_dev_info(xen_domid, chr, "/console");
936 } else {
937 char buf[32];
938 snprintf(buf, sizeof(buf), "/device/console/%d", i);
939 store_dev_info(xen_domid, chr, buf);
940 }
941 }
942
943 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
944 {
945 char path[50];
946
947 if (xs == NULL) {
948 fprintf(stderr, "xenstore connection not initialized\n");
949 exit(1);
950 }
951
952 snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
953 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
954 fprintf(stderr, "error recording dm state\n");
955 exit(1);
956 }
957 }
958
959 static void xen_main_loop_prepare(XenIOState *state)
960 {
961 int evtchn_fd = -1;
962
963 if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
964 evtchn_fd = xc_evtchn_fd(state->xce_handle);
965 }
966
967 state->buffered_io_timer = timer_new_ms(QEMU_CLOCK_REALTIME, handle_buffered_io,
968 state);
969
970 if (evtchn_fd != -1) {
971 qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
972 }
973 }
974
975
976 /* Initialise Xen */
977
978 static void xen_change_state_handler(void *opaque, int running,
979 RunState state)
980 {
981 if (running) {
982 /* record state running */
983 xenstore_record_dm_state(xenstore, "running");
984 }
985 }
986
987 static void xen_hvm_change_state_handler(void *opaque, int running,
988 RunState rstate)
989 {
990 XenIOState *xstate = opaque;
991 if (running) {
992 xen_main_loop_prepare(xstate);
993 }
994 }
995
996 static void xen_exit_notifier(Notifier *n, void *data)
997 {
998 XenIOState *state = container_of(n, XenIOState, exit);
999
1000 xc_evtchn_close(state->xce_handle);
1001 xs_daemon_close(state->xenstore);
1002 }
1003
1004 int xen_init(QEMUMachine *machine)
1005 {
1006 xen_xc = xen_xc_interface_open(0, 0, 0);
1007 if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
1008 xen_be_printf(NULL, 0, "can't open xen interface\n");
1009 return -1;
1010 }
1011 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
1012
1013 return 0;
1014 }
1015
1016 static void xen_read_physmap(XenIOState *state)
1017 {
1018 XenPhysmap *physmap = NULL;
1019 unsigned int len, num, i;
1020 char path[80], *value = NULL;
1021 char **entries = NULL;
1022
1023 snprintf(path, sizeof(path),
1024 "/local/domain/0/device-model/%d/physmap", xen_domid);
1025 entries = xs_directory(state->xenstore, 0, path, &num);
1026 if (entries == NULL)
1027 return;
1028
1029 for (i = 0; i < num; i++) {
1030 physmap = g_malloc(sizeof (XenPhysmap));
1031 physmap->phys_offset = strtoull(entries[i], NULL, 16);
1032 snprintf(path, sizeof(path),
1033 "/local/domain/0/device-model/%d/physmap/%s/start_addr",
1034 xen_domid, entries[i]);
1035 value = xs_read(state->xenstore, 0, path, &len);
1036 if (value == NULL) {
1037 g_free(physmap);
1038 continue;
1039 }
1040 physmap->start_addr = strtoull(value, NULL, 16);
1041 free(value);
1042
1043 snprintf(path, sizeof(path),
1044 "/local/domain/0/device-model/%d/physmap/%s/size",
1045 xen_domid, entries[i]);
1046 value = xs_read(state->xenstore, 0, path, &len);
1047 if (value == NULL) {
1048 g_free(physmap);
1049 continue;
1050 }
1051 physmap->size = strtoull(value, NULL, 16);
1052 free(value);
1053
1054 snprintf(path, sizeof(path),
1055 "/local/domain/0/device-model/%d/physmap/%s/name",
1056 xen_domid, entries[i]);
1057 physmap->name = xs_read(state->xenstore, 0, path, &len);
1058
1059 QLIST_INSERT_HEAD(&state->physmap, physmap, list);
1060 }
1061 free(entries);
1062 }
1063
1064 static void xen_wakeup_notifier(Notifier *notifier, void *data)
1065 {
1066 xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 0);
1067 }
1068
1069 int xen_hvm_init(MemoryRegion **ram_memory)
1070 {
1071 int i, rc;
1072 unsigned long ioreq_pfn;
1073 unsigned long bufioreq_evtchn;
1074 XenIOState *state;
1075
1076 state = g_malloc0(sizeof (XenIOState));
1077
1078 state->xce_handle = xen_xc_evtchn_open(NULL, 0);
1079 if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
1080 perror("xen: event channel open");
1081 g_free(state);
1082 return -errno;
1083 }
1084
1085 state->xenstore = xs_daemon_open();
1086 if (state->xenstore == NULL) {
1087 perror("xen: xenstore open");
1088 g_free(state);
1089 return -errno;
1090 }
1091
1092 state->exit.notify = xen_exit_notifier;
1093 qemu_add_exit_notifier(&state->exit);
1094
1095 state->suspend.notify = xen_suspend_notifier;
1096 qemu_register_suspend_notifier(&state->suspend);
1097
1098 state->wakeup.notify = xen_wakeup_notifier;
1099 qemu_register_wakeup_notifier(&state->wakeup);
1100
1101 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
1102 DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
1103 state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
1104 PROT_READ|PROT_WRITE, ioreq_pfn);
1105 if (state->shared_page == NULL) {
1106 hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
1107 errno, xen_xc);
1108 }
1109
1110 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
1111 DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
1112 state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
1113 PROT_READ|PROT_WRITE, ioreq_pfn);
1114 if (state->buffered_io_page == NULL) {
1115 hw_error("map buffered IO page returned error %d", errno);
1116 }
1117
1118 state->ioreq_local_port = g_malloc0(max_cpus * sizeof (evtchn_port_t));
1119
1120 /* FIXME: how about if we overflow the page here? */
1121 for (i = 0; i < max_cpus; i++) {
1122 rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
1123 xen_vcpu_eport(state->shared_page, i));
1124 if (rc == -1) {
1125 fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
1126 return -1;
1127 }
1128 state->ioreq_local_port[i] = rc;
1129 }
1130
1131 rc = xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_EVTCHN,
1132 &bufioreq_evtchn);
1133 if (rc < 0) {
1134 fprintf(stderr, "failed to get HVM_PARAM_BUFIOREQ_EVTCHN\n");
1135 return -1;
1136 }
1137 rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
1138 (uint32_t)bufioreq_evtchn);
1139 if (rc == -1) {
1140 fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
1141 return -1;
1142 }
1143 state->bufioreq_local_port = rc;
1144
1145 /* Init RAM management */
1146 xen_map_cache_init(xen_phys_offset_to_gaddr, state);
1147 xen_ram_init(ram_size, ram_memory);
1148
1149 qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
1150
1151 state->memory_listener = xen_memory_listener;
1152 QLIST_INIT(&state->physmap);
1153 memory_listener_register(&state->memory_listener, &address_space_memory);
1154 state->log_for_dirtybit = NULL;
1155
1156 /* Initialize backend core & drivers */
1157 if (xen_be_init() != 0) {
1158 fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
1159 exit(1);
1160 }
1161 xen_be_register("console", &xen_console_ops);
1162 xen_be_register("vkbd", &xen_kbdmouse_ops);
1163 xen_be_register("qdisk", &xen_blkdev_ops);
1164 xen_read_physmap(state);
1165
1166 return 0;
1167 }
1168
1169 void destroy_hvm_domain(bool reboot)
1170 {
1171 XenXC xc_handle;
1172 int sts;
1173
1174 xc_handle = xen_xc_interface_open(0, 0, 0);
1175 if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
1176 fprintf(stderr, "Cannot acquire xenctrl handle\n");
1177 } else {
1178 sts = xc_domain_shutdown(xc_handle, xen_domid,
1179 reboot ? SHUTDOWN_reboot : SHUTDOWN_poweroff);
1180 if (sts != 0) {
1181 fprintf(stderr, "xc_domain_shutdown failed to issue %s, "
1182 "sts %d, %s\n", reboot ? "reboot" : "poweroff",
1183 sts, strerror(errno));
1184 } else {
1185 fprintf(stderr, "Issued domain %d %s\n", xen_domid,
1186 reboot ? "reboot" : "poweroff");
1187 }
1188 xc_interface_close(xc_handle);
1189 }
1190 }
1191
1192 void xen_register_framebuffer(MemoryRegion *mr)
1193 {
1194 framebuffer = mr;
1195 }
1196
1197 void xen_shutdown_fatal_error(const char *fmt, ...)
1198 {
1199 va_list ap;
1200
1201 va_start(ap, fmt);
1202 vfprintf(stderr, fmt, ap);
1203 va_end(ap);
1204 fprintf(stderr, "Will destroy the domain.\n");
1205 /* destroy the domain */
1206 qemu_system_shutdown_request();
1207 }
1208
1209 void xen_modified_memory(ram_addr_t start, ram_addr_t length)
1210 {
1211 if (unlikely(xen_in_migration)) {
1212 int rc;
1213 ram_addr_t start_pfn, nb_pages;
1214
1215 if (length == 0) {
1216 length = TARGET_PAGE_SIZE;
1217 }
1218 start_pfn = start >> TARGET_PAGE_BITS;
1219 nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >> TARGET_PAGE_BITS)
1220 - start_pfn;
1221 rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages);
1222 if (rc) {
1223 fprintf(stderr,
1224 "%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i, %s\n",
1225 __func__, start, nb_pages, rc, strerror(-rc));
1226 }
1227 }
1228 }