hyper-v: introduce Hyper-V support infrastructure.
[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.h"
14 #include "hw/pc.h"
15 #include "hw/xen_common.h"
16 #include "hw/xen_backend.h"
17
18 #include "range.h"
19 #include "xen-mapcache.h"
20 #include "trace.h"
21 #include "exec-memory.h"
22
23 #include <xen/hvm/ioreq.h>
24 #include <xen/hvm/params.h>
25 #include <xen/hvm/e820.h>
26
27 //#define DEBUG_XEN
28
29 #ifdef DEBUG_XEN
30 #define DPRINTF(fmt, ...) \
31 do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
32 #else
33 #define DPRINTF(fmt, ...) \
34 do { } while (0)
35 #endif
36
37 static MemoryRegion ram_memory, ram_640k, ram_lo, ram_hi;
38 static MemoryRegion *framebuffer;
39
40 /* Compatibility with older version */
41 #if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
42 static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
43 {
44 return shared_page->vcpu_iodata[i].vp_eport;
45 }
46 static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
47 {
48 return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
49 }
50 # define FMT_ioreq_size PRIx64
51 #else
52 static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
53 {
54 return shared_page->vcpu_ioreq[i].vp_eport;
55 }
56 static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
57 {
58 return &shared_page->vcpu_ioreq[vcpu];
59 }
60 # define FMT_ioreq_size "u"
61 #endif
62
63 #define BUFFER_IO_MAX_DELAY 100
64
65 typedef struct XenPhysmap {
66 target_phys_addr_t start_addr;
67 ram_addr_t size;
68 MemoryRegion *mr;
69 target_phys_addr_t phys_offset;
70
71 QLIST_ENTRY(XenPhysmap) list;
72 } XenPhysmap;
73
74 typedef struct XenIOState {
75 shared_iopage_t *shared_page;
76 buffered_iopage_t *buffered_io_page;
77 QEMUTimer *buffered_io_timer;
78 /* the evtchn port for polling the notification, */
79 evtchn_port_t *ioreq_local_port;
80 /* the evtchn fd for polling */
81 XenEvtchn xce_handle;
82 /* which vcpu we are serving */
83 int send_vcpu;
84
85 struct xs_handle *xenstore;
86 MemoryListener memory_listener;
87 QLIST_HEAD(, XenPhysmap) physmap;
88 target_phys_addr_t free_phys_offset;
89 const XenPhysmap *log_for_dirtybit;
90
91 Notifier exit;
92 } XenIOState;
93
94 /* Xen specific function for piix pci */
95
96 int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
97 {
98 return irq_num + ((pci_dev->devfn >> 3) << 2);
99 }
100
101 void xen_piix3_set_irq(void *opaque, int irq_num, int level)
102 {
103 xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2,
104 irq_num & 3, level);
105 }
106
107 void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
108 {
109 int i;
110
111 /* Scan for updates to PCI link routes (0x60-0x63). */
112 for (i = 0; i < len; i++) {
113 uint8_t v = (val >> (8 * i)) & 0xff;
114 if (v & 0x80) {
115 v = 0;
116 }
117 v &= 0xf;
118 if (((address + i) >= 0x60) && ((address + i) <= 0x63)) {
119 xc_hvm_set_pci_link_route(xen_xc, xen_domid, address + i - 0x60, v);
120 }
121 }
122 }
123
124 void xen_cmos_set_s3_resume(void *opaque, int irq, int level)
125 {
126 pc_cmos_set_s3_resume(opaque, irq, level);
127 if (level) {
128 xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 3);
129 }
130 }
131
132 /* Xen Interrupt Controller */
133
134 static void xen_set_irq(void *opaque, int irq, int level)
135 {
136 xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
137 }
138
139 qemu_irq *xen_interrupt_controller_init(void)
140 {
141 return qemu_allocate_irqs(xen_set_irq, NULL, 16);
142 }
143
144 /* Memory Ops */
145
146 static void xen_ram_init(ram_addr_t ram_size)
147 {
148 MemoryRegion *sysmem = get_system_memory();
149 ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
150 ram_addr_t block_len;
151
152 block_len = ram_size;
153 if (ram_size >= HVM_BELOW_4G_RAM_END) {
154 /* Xen does not allocate the memory continuously, and keep a hole at
155 * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
156 */
157 block_len += HVM_BELOW_4G_MMIO_LENGTH;
158 }
159 memory_region_init_ram(&ram_memory, "xen.ram", block_len);
160 vmstate_register_ram_global(&ram_memory);
161
162 if (ram_size >= HVM_BELOW_4G_RAM_END) {
163 above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
164 below_4g_mem_size = HVM_BELOW_4G_RAM_END;
165 } else {
166 below_4g_mem_size = ram_size;
167 }
168
169 memory_region_init_alias(&ram_640k, "xen.ram.640k",
170 &ram_memory, 0, 0xa0000);
171 memory_region_add_subregion(sysmem, 0, &ram_640k);
172 /* Skip of the VGA IO memory space, it will be registered later by the VGA
173 * emulated device.
174 *
175 * The area between 0xc0000 and 0x100000 will be used by SeaBIOS to load
176 * the Options ROM, so it is registered here as RAM.
177 */
178 memory_region_init_alias(&ram_lo, "xen.ram.lo",
179 &ram_memory, 0xc0000, below_4g_mem_size - 0xc0000);
180 memory_region_add_subregion(sysmem, 0xc0000, &ram_lo);
181 if (above_4g_mem_size > 0) {
182 memory_region_init_alias(&ram_hi, "xen.ram.hi",
183 &ram_memory, 0x100000000ULL,
184 above_4g_mem_size);
185 memory_region_add_subregion(sysmem, 0x100000000ULL, &ram_hi);
186 }
187 }
188
189 void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
190 {
191 unsigned long nr_pfn;
192 xen_pfn_t *pfn_list;
193 int i;
194
195 if (mr == &ram_memory) {
196 return;
197 }
198
199 trace_xen_ram_alloc(ram_addr, size);
200
201 nr_pfn = size >> TARGET_PAGE_BITS;
202 pfn_list = g_malloc(sizeof (*pfn_list) * nr_pfn);
203
204 for (i = 0; i < nr_pfn; i++) {
205 pfn_list[i] = (ram_addr >> TARGET_PAGE_BITS) + i;
206 }
207
208 if (xc_domain_populate_physmap_exact(xen_xc, xen_domid, nr_pfn, 0, 0, pfn_list)) {
209 hw_error("xen: failed to populate ram at " RAM_ADDR_FMT, ram_addr);
210 }
211
212 g_free(pfn_list);
213 }
214
215 static XenPhysmap *get_physmapping(XenIOState *state,
216 target_phys_addr_t start_addr, ram_addr_t size)
217 {
218 XenPhysmap *physmap = NULL;
219
220 start_addr &= TARGET_PAGE_MASK;
221
222 QLIST_FOREACH(physmap, &state->physmap, list) {
223 if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) {
224 return physmap;
225 }
226 }
227 return NULL;
228 }
229
230 #if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
231 static int xen_add_to_physmap(XenIOState *state,
232 target_phys_addr_t start_addr,
233 ram_addr_t size,
234 MemoryRegion *mr,
235 target_phys_addr_t offset_within_region)
236 {
237 unsigned long i = 0;
238 int rc = 0;
239 XenPhysmap *physmap = NULL;
240 target_phys_addr_t pfn, start_gpfn;
241 target_phys_addr_t phys_offset = memory_region_get_ram_addr(mr);
242
243 if (get_physmapping(state, start_addr, size)) {
244 return 0;
245 }
246 if (size <= 0) {
247 return -1;
248 }
249
250 /* Xen can only handle a single dirty log region for now and we want
251 * the linear framebuffer to be that region.
252 * Avoid tracking any regions that is not videoram and avoid tracking
253 * the legacy vga region. */
254 if (mr == framebuffer && start_addr > 0xbffff) {
255 goto go_physmap;
256 }
257 return -1;
258
259 go_physmap:
260 DPRINTF("mapping vram to %llx - %llx\n", start_addr, start_addr + size);
261
262 pfn = phys_offset >> TARGET_PAGE_BITS;
263 start_gpfn = start_addr >> TARGET_PAGE_BITS;
264 for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
265 unsigned long idx = pfn + i;
266 xen_pfn_t gpfn = start_gpfn + i;
267
268 rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
269 if (rc) {
270 DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
271 PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
272 return -rc;
273 }
274 }
275
276 physmap = g_malloc(sizeof (XenPhysmap));
277
278 physmap->start_addr = start_addr;
279 physmap->size = size;
280 physmap->phys_offset = phys_offset;
281
282 QLIST_INSERT_HEAD(&state->physmap, physmap, list);
283
284 xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
285 start_addr >> TARGET_PAGE_BITS,
286 (start_addr + size) >> TARGET_PAGE_BITS,
287 XEN_DOMCTL_MEM_CACHEATTR_WB);
288 return 0;
289 }
290
291 static int xen_remove_from_physmap(XenIOState *state,
292 target_phys_addr_t start_addr,
293 ram_addr_t size)
294 {
295 unsigned long i = 0;
296 int rc = 0;
297 XenPhysmap *physmap = NULL;
298 target_phys_addr_t phys_offset = 0;
299
300 physmap = get_physmapping(state, start_addr, size);
301 if (physmap == NULL) {
302 return -1;
303 }
304
305 phys_offset = physmap->phys_offset;
306 size = physmap->size;
307
308 DPRINTF("unmapping vram to %llx - %llx, from %llx\n",
309 phys_offset, phys_offset + size, start_addr);
310
311 size >>= TARGET_PAGE_BITS;
312 start_addr >>= TARGET_PAGE_BITS;
313 phys_offset >>= TARGET_PAGE_BITS;
314 for (i = 0; i < size; i++) {
315 unsigned long idx = start_addr + i;
316 xen_pfn_t gpfn = phys_offset + i;
317
318 rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
319 if (rc) {
320 fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
321 PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
322 return -rc;
323 }
324 }
325
326 QLIST_REMOVE(physmap, list);
327 if (state->log_for_dirtybit == physmap) {
328 state->log_for_dirtybit = NULL;
329 }
330 free(physmap);
331
332 return 0;
333 }
334
335 #else
336 static int xen_add_to_physmap(XenIOState *state,
337 target_phys_addr_t start_addr,
338 ram_addr_t size,
339 MemoryRegion *mr,
340 target_phys_addr_t offset_within_region)
341 {
342 return -ENOSYS;
343 }
344
345 static int xen_remove_from_physmap(XenIOState *state,
346 target_phys_addr_t start_addr,
347 ram_addr_t size)
348 {
349 return -ENOSYS;
350 }
351 #endif
352
353 static void xen_set_memory(struct MemoryListener *listener,
354 MemoryRegionSection *section,
355 bool add)
356 {
357 XenIOState *state = container_of(listener, XenIOState, memory_listener);
358 target_phys_addr_t start_addr = section->offset_within_address_space;
359 ram_addr_t size = section->size;
360 bool log_dirty = memory_region_is_logging(section->mr);
361 hvmmem_type_t mem_type;
362
363 if (!memory_region_is_ram(section->mr)) {
364 return;
365 }
366
367 if (!(section->mr != &ram_memory
368 && ( (log_dirty && add) || (!log_dirty && !add)))) {
369 return;
370 }
371
372 trace_xen_client_set_memory(start_addr, size, log_dirty);
373
374 start_addr &= TARGET_PAGE_MASK;
375 size = TARGET_PAGE_ALIGN(size);
376
377 if (add) {
378 if (!memory_region_is_rom(section->mr)) {
379 xen_add_to_physmap(state, start_addr, size,
380 section->mr, section->offset_within_region);
381 } else {
382 mem_type = HVMMEM_ram_ro;
383 if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
384 start_addr >> TARGET_PAGE_BITS,
385 size >> TARGET_PAGE_BITS)) {
386 DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n",
387 start_addr);
388 }
389 }
390 } else {
391 if (xen_remove_from_physmap(state, start_addr, size) < 0) {
392 DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n", start_addr);
393 }
394 }
395 }
396
397 static void xen_region_add(MemoryListener *listener,
398 MemoryRegionSection *section)
399 {
400 xen_set_memory(listener, section, true);
401 }
402
403 static void xen_region_del(MemoryListener *listener,
404 MemoryRegionSection *section)
405 {
406 xen_set_memory(listener, section, false);
407 }
408
409 static void xen_sync_dirty_bitmap(XenIOState *state,
410 target_phys_addr_t start_addr,
411 ram_addr_t size)
412 {
413 target_phys_addr_t npages = size >> TARGET_PAGE_BITS;
414 const int width = sizeof(unsigned long) * 8;
415 unsigned long bitmap[(npages + width - 1) / width];
416 int rc, i, j;
417 const XenPhysmap *physmap = NULL;
418
419 physmap = get_physmapping(state, start_addr, size);
420 if (physmap == NULL) {
421 /* not handled */
422 return;
423 }
424
425 if (state->log_for_dirtybit == NULL) {
426 state->log_for_dirtybit = physmap;
427 } else if (state->log_for_dirtybit != physmap) {
428 /* Only one range for dirty bitmap can be tracked. */
429 return;
430 }
431
432 rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
433 start_addr >> TARGET_PAGE_BITS, npages,
434 bitmap);
435 if (rc < 0) {
436 if (rc != -ENODATA) {
437 fprintf(stderr, "xen: track_dirty_vram failed (0x" TARGET_FMT_plx
438 ", 0x" TARGET_FMT_plx "): %s\n",
439 start_addr, start_addr + size, strerror(-rc));
440 }
441 return;
442 }
443
444 for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
445 unsigned long map = bitmap[i];
446 while (map != 0) {
447 j = ffsl(map) - 1;
448 map &= ~(1ul << j);
449 memory_region_set_dirty(framebuffer,
450 (i * width + j) * TARGET_PAGE_SIZE);
451 };
452 }
453 }
454
455 static void xen_log_start(MemoryListener *listener,
456 MemoryRegionSection *section)
457 {
458 XenIOState *state = container_of(listener, XenIOState, memory_listener);
459
460 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
461 section->size);
462 }
463
464 static void xen_log_stop(MemoryListener *listener, MemoryRegionSection *section)
465 {
466 XenIOState *state = container_of(listener, XenIOState, memory_listener);
467
468 state->log_for_dirtybit = NULL;
469 /* Disable dirty bit tracking */
470 xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
471 }
472
473 static void xen_log_sync(MemoryListener *listener, MemoryRegionSection *section)
474 {
475 XenIOState *state = container_of(listener, XenIOState, memory_listener);
476
477 xen_sync_dirty_bitmap(state, section->offset_within_address_space,
478 section->size);
479 }
480
481 static void xen_log_global_start(MemoryListener *listener)
482 {
483 }
484
485 static void xen_log_global_stop(MemoryListener *listener)
486 {
487 }
488
489 static MemoryListener xen_memory_listener = {
490 .region_add = xen_region_add,
491 .region_del = xen_region_del,
492 .log_start = xen_log_start,
493 .log_stop = xen_log_stop,
494 .log_sync = xen_log_sync,
495 .log_global_start = xen_log_global_start,
496 .log_global_stop = xen_log_global_stop,
497 };
498
499 /* VCPU Operations, MMIO, IO ring ... */
500
501 static void xen_reset_vcpu(void *opaque)
502 {
503 CPUState *env = opaque;
504
505 env->halted = 1;
506 }
507
508 void xen_vcpu_init(void)
509 {
510 CPUState *first_cpu;
511
512 if ((first_cpu = qemu_get_cpu(0))) {
513 qemu_register_reset(xen_reset_vcpu, first_cpu);
514 xen_reset_vcpu(first_cpu);
515 }
516 }
517
518 /* get the ioreq packets from share mem */
519 static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
520 {
521 ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu);
522
523 if (req->state != STATE_IOREQ_READY) {
524 DPRINTF("I/O request not ready: "
525 "%x, ptr: %x, port: %"PRIx64", "
526 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
527 req->state, req->data_is_ptr, req->addr,
528 req->data, req->count, req->size);
529 return NULL;
530 }
531
532 xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
533
534 req->state = STATE_IOREQ_INPROCESS;
535 return req;
536 }
537
538 /* use poll to get the port notification */
539 /* ioreq_vec--out,the */
540 /* retval--the number of ioreq packet */
541 static ioreq_t *cpu_get_ioreq(XenIOState *state)
542 {
543 int i;
544 evtchn_port_t port;
545
546 port = xc_evtchn_pending(state->xce_handle);
547 if (port != -1) {
548 for (i = 0; i < smp_cpus; i++) {
549 if (state->ioreq_local_port[i] == port) {
550 break;
551 }
552 }
553
554 if (i == smp_cpus) {
555 hw_error("Fatal error while trying to get io event!\n");
556 }
557
558 /* unmask the wanted port again */
559 xc_evtchn_unmask(state->xce_handle, port);
560
561 /* get the io packet from shared memory */
562 state->send_vcpu = i;
563 return cpu_get_ioreq_from_shared_memory(state, i);
564 }
565
566 /* read error or read nothing */
567 return NULL;
568 }
569
570 static uint32_t do_inp(pio_addr_t addr, unsigned long size)
571 {
572 switch (size) {
573 case 1:
574 return cpu_inb(addr);
575 case 2:
576 return cpu_inw(addr);
577 case 4:
578 return cpu_inl(addr);
579 default:
580 hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size);
581 }
582 }
583
584 static void do_outp(pio_addr_t addr,
585 unsigned long size, uint32_t val)
586 {
587 switch (size) {
588 case 1:
589 return cpu_outb(addr, val);
590 case 2:
591 return cpu_outw(addr, val);
592 case 4:
593 return cpu_outl(addr, val);
594 default:
595 hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size);
596 }
597 }
598
599 static void cpu_ioreq_pio(ioreq_t *req)
600 {
601 int i, sign;
602
603 sign = req->df ? -1 : 1;
604
605 if (req->dir == IOREQ_READ) {
606 if (!req->data_is_ptr) {
607 req->data = do_inp(req->addr, req->size);
608 } else {
609 uint32_t tmp;
610
611 for (i = 0; i < req->count; i++) {
612 tmp = do_inp(req->addr, req->size);
613 cpu_physical_memory_write(req->data + (sign * i * req->size),
614 (uint8_t *) &tmp, req->size);
615 }
616 }
617 } else if (req->dir == IOREQ_WRITE) {
618 if (!req->data_is_ptr) {
619 do_outp(req->addr, req->size, req->data);
620 } else {
621 for (i = 0; i < req->count; i++) {
622 uint32_t tmp = 0;
623
624 cpu_physical_memory_read(req->data + (sign * i * req->size),
625 (uint8_t*) &tmp, req->size);
626 do_outp(req->addr, req->size, tmp);
627 }
628 }
629 }
630 }
631
632 static void cpu_ioreq_move(ioreq_t *req)
633 {
634 int i, sign;
635
636 sign = req->df ? -1 : 1;
637
638 if (!req->data_is_ptr) {
639 if (req->dir == IOREQ_READ) {
640 for (i = 0; i < req->count; i++) {
641 cpu_physical_memory_read(req->addr + (sign * i * req->size),
642 (uint8_t *) &req->data, req->size);
643 }
644 } else if (req->dir == IOREQ_WRITE) {
645 for (i = 0; i < req->count; i++) {
646 cpu_physical_memory_write(req->addr + (sign * i * req->size),
647 (uint8_t *) &req->data, req->size);
648 }
649 }
650 } else {
651 uint64_t tmp;
652
653 if (req->dir == IOREQ_READ) {
654 for (i = 0; i < req->count; i++) {
655 cpu_physical_memory_read(req->addr + (sign * i * req->size),
656 (uint8_t*) &tmp, req->size);
657 cpu_physical_memory_write(req->data + (sign * i * req->size),
658 (uint8_t*) &tmp, req->size);
659 }
660 } else if (req->dir == IOREQ_WRITE) {
661 for (i = 0; i < req->count; i++) {
662 cpu_physical_memory_read(req->data + (sign * i * req->size),
663 (uint8_t*) &tmp, req->size);
664 cpu_physical_memory_write(req->addr + (sign * i * req->size),
665 (uint8_t*) &tmp, req->size);
666 }
667 }
668 }
669 }
670
671 static void handle_ioreq(ioreq_t *req)
672 {
673 if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
674 (req->size < sizeof (target_ulong))) {
675 req->data &= ((target_ulong) 1 << (8 * req->size)) - 1;
676 }
677
678 switch (req->type) {
679 case IOREQ_TYPE_PIO:
680 cpu_ioreq_pio(req);
681 break;
682 case IOREQ_TYPE_COPY:
683 cpu_ioreq_move(req);
684 break;
685 case IOREQ_TYPE_TIMEOFFSET:
686 break;
687 case IOREQ_TYPE_INVALIDATE:
688 xen_invalidate_map_cache();
689 break;
690 default:
691 hw_error("Invalid ioreq type 0x%x\n", req->type);
692 }
693 }
694
695 static void handle_buffered_iopage(XenIOState *state)
696 {
697 buf_ioreq_t *buf_req = NULL;
698 ioreq_t req;
699 int qw;
700
701 if (!state->buffered_io_page) {
702 return;
703 }
704
705 while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
706 buf_req = &state->buffered_io_page->buf_ioreq[
707 state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM];
708 req.size = 1UL << buf_req->size;
709 req.count = 1;
710 req.addr = buf_req->addr;
711 req.data = buf_req->data;
712 req.state = STATE_IOREQ_READY;
713 req.dir = buf_req->dir;
714 req.df = 1;
715 req.type = buf_req->type;
716 req.data_is_ptr = 0;
717 qw = (req.size == 8);
718 if (qw) {
719 buf_req = &state->buffered_io_page->buf_ioreq[
720 (state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
721 req.data |= ((uint64_t)buf_req->data) << 32;
722 }
723
724 handle_ioreq(&req);
725
726 xen_mb();
727 state->buffered_io_page->read_pointer += qw ? 2 : 1;
728 }
729 }
730
731 static void handle_buffered_io(void *opaque)
732 {
733 XenIOState *state = opaque;
734
735 handle_buffered_iopage(state);
736 qemu_mod_timer(state->buffered_io_timer,
737 BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
738 }
739
740 static void cpu_handle_ioreq(void *opaque)
741 {
742 XenIOState *state = opaque;
743 ioreq_t *req = cpu_get_ioreq(state);
744
745 handle_buffered_iopage(state);
746 if (req) {
747 handle_ioreq(req);
748
749 if (req->state != STATE_IOREQ_INPROCESS) {
750 fprintf(stderr, "Badness in I/O request ... not in service?!: "
751 "%x, ptr: %x, port: %"PRIx64", "
752 "data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
753 req->state, req->data_is_ptr, req->addr,
754 req->data, req->count, req->size);
755 destroy_hvm_domain();
756 return;
757 }
758
759 xen_wmb(); /* Update ioreq contents /then/ update state. */
760
761 /*
762 * We do this before we send the response so that the tools
763 * have the opportunity to pick up on the reset before the
764 * guest resumes and does a hlt with interrupts disabled which
765 * causes Xen to powerdown the domain.
766 */
767 if (runstate_is_running()) {
768 if (qemu_shutdown_requested_get()) {
769 destroy_hvm_domain();
770 }
771 if (qemu_reset_requested_get()) {
772 qemu_system_reset(VMRESET_REPORT);
773 }
774 }
775
776 req->state = STATE_IORESP_READY;
777 xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
778 }
779 }
780
781 static int store_dev_info(int domid, CharDriverState *cs, const char *string)
782 {
783 struct xs_handle *xs = NULL;
784 char *path = NULL;
785 char *newpath = NULL;
786 char *pts = NULL;
787 int ret = -1;
788
789 /* Only continue if we're talking to a pty. */
790 if (strncmp(cs->filename, "pty:", 4)) {
791 return 0;
792 }
793 pts = cs->filename + 4;
794
795 /* We now have everything we need to set the xenstore entry. */
796 xs = xs_open(0);
797 if (xs == NULL) {
798 fprintf(stderr, "Could not contact XenStore\n");
799 goto out;
800 }
801
802 path = xs_get_domain_path(xs, domid);
803 if (path == NULL) {
804 fprintf(stderr, "xs_get_domain_path() error\n");
805 goto out;
806 }
807 newpath = realloc(path, (strlen(path) + strlen(string) +
808 strlen("/tty") + 1));
809 if (newpath == NULL) {
810 fprintf(stderr, "realloc error\n");
811 goto out;
812 }
813 path = newpath;
814
815 strcat(path, string);
816 strcat(path, "/tty");
817 if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
818 fprintf(stderr, "xs_write for '%s' fail", string);
819 goto out;
820 }
821 ret = 0;
822
823 out:
824 free(path);
825 xs_close(xs);
826
827 return ret;
828 }
829
830 void xenstore_store_pv_console_info(int i, CharDriverState *chr)
831 {
832 if (i == 0) {
833 store_dev_info(xen_domid, chr, "/console");
834 } else {
835 char buf[32];
836 snprintf(buf, sizeof(buf), "/device/console/%d", i);
837 store_dev_info(xen_domid, chr, buf);
838 }
839 }
840
841 static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
842 {
843 char path[50];
844
845 if (xs == NULL) {
846 fprintf(stderr, "xenstore connection not initialized\n");
847 exit(1);
848 }
849
850 snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid);
851 if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
852 fprintf(stderr, "error recording dm state\n");
853 exit(1);
854 }
855 }
856
857 static void xen_main_loop_prepare(XenIOState *state)
858 {
859 int evtchn_fd = -1;
860
861 if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
862 evtchn_fd = xc_evtchn_fd(state->xce_handle);
863 }
864
865 state->buffered_io_timer = qemu_new_timer_ms(rt_clock, handle_buffered_io,
866 state);
867 qemu_mod_timer(state->buffered_io_timer, qemu_get_clock_ms(rt_clock));
868
869 if (evtchn_fd != -1) {
870 qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
871 }
872 }
873
874
875 /* Initialise Xen */
876
877 static void xen_change_state_handler(void *opaque, int running,
878 RunState state)
879 {
880 if (running) {
881 /* record state running */
882 xenstore_record_dm_state(xenstore, "running");
883 }
884 }
885
886 static void xen_hvm_change_state_handler(void *opaque, int running,
887 RunState rstate)
888 {
889 XenIOState *xstate = opaque;
890 if (running) {
891 xen_main_loop_prepare(xstate);
892 }
893 }
894
895 static void xen_exit_notifier(Notifier *n, void *data)
896 {
897 XenIOState *state = container_of(n, XenIOState, exit);
898
899 xc_evtchn_close(state->xce_handle);
900 xs_daemon_close(state->xenstore);
901 }
902
903 int xen_init(void)
904 {
905 xen_xc = xen_xc_interface_open(0, 0, 0);
906 if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
907 xen_be_printf(NULL, 0, "can't open xen interface\n");
908 return -1;
909 }
910 qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
911
912 return 0;
913 }
914
915 int xen_hvm_init(void)
916 {
917 int i, rc;
918 unsigned long ioreq_pfn;
919 XenIOState *state;
920
921 state = g_malloc0(sizeof (XenIOState));
922
923 state->xce_handle = xen_xc_evtchn_open(NULL, 0);
924 if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
925 perror("xen: event channel open");
926 return -errno;
927 }
928
929 state->xenstore = xs_daemon_open();
930 if (state->xenstore == NULL) {
931 perror("xen: xenstore open");
932 return -errno;
933 }
934
935 state->exit.notify = xen_exit_notifier;
936 qemu_add_exit_notifier(&state->exit);
937
938 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
939 DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
940 state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
941 PROT_READ|PROT_WRITE, ioreq_pfn);
942 if (state->shared_page == NULL) {
943 hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
944 errno, xen_xc);
945 }
946
947 xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
948 DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
949 state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
950 PROT_READ|PROT_WRITE, ioreq_pfn);
951 if (state->buffered_io_page == NULL) {
952 hw_error("map buffered IO page returned error %d", errno);
953 }
954
955 state->ioreq_local_port = g_malloc0(smp_cpus * sizeof (evtchn_port_t));
956
957 /* FIXME: how about if we overflow the page here? */
958 for (i = 0; i < smp_cpus; i++) {
959 rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
960 xen_vcpu_eport(state->shared_page, i));
961 if (rc == -1) {
962 fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
963 return -1;
964 }
965 state->ioreq_local_port[i] = rc;
966 }
967
968 /* Init RAM management */
969 xen_map_cache_init();
970 xen_ram_init(ram_size);
971
972 qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
973
974 state->memory_listener = xen_memory_listener;
975 QLIST_INIT(&state->physmap);
976 memory_listener_register(&state->memory_listener);
977 state->log_for_dirtybit = NULL;
978
979 /* Initialize backend core & drivers */
980 if (xen_be_init() != 0) {
981 fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
982 exit(1);
983 }
984 xen_be_register("console", &xen_console_ops);
985 xen_be_register("vkbd", &xen_kbdmouse_ops);
986 xen_be_register("qdisk", &xen_blkdev_ops);
987
988 return 0;
989 }
990
991 void destroy_hvm_domain(void)
992 {
993 XenXC xc_handle;
994 int sts;
995
996 xc_handle = xen_xc_interface_open(0, 0, 0);
997 if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
998 fprintf(stderr, "Cannot acquire xenctrl handle\n");
999 } else {
1000 sts = xc_domain_shutdown(xc_handle, xen_domid, SHUTDOWN_poweroff);
1001 if (sts != 0) {
1002 fprintf(stderr, "? xc_domain_shutdown failed to issue poweroff, "
1003 "sts %d, %s\n", sts, strerror(errno));
1004 } else {
1005 fprintf(stderr, "Issued domain %d poweroff\n", xen_domid);
1006 }
1007 xc_interface_close(xc_handle);
1008 }
1009 }
1010
1011 void xen_register_framebuffer(MemoryRegion *mr)
1012 {
1013 framebuffer = mr;
1014 }