x86_xpmap.c revision 1.35
1 /* $NetBSD: x86_xpmap.c,v 1.35 2011/11/06 11:40:47 cherry Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Mathieu Ropert <mro (at) adviseo.fr> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * Copyright (c) 2006, 2007 Manuel Bouyer. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the above copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 32 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 33 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 34 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 * 42 */ 43 44 /* 45 * 46 * Copyright (c) 2004 Christian Limpach. 47 * All rights reserved. 48 * 49 * Redistribution and use in source and binary forms, with or without 50 * modification, are permitted provided that the following conditions 51 * are met: 52 * 1. Redistributions of source code must retain the above copyright 53 * notice, this list of conditions and the following disclaimer. 54 * 2. Redistributions in binary form must reproduce the above copyright 55 * notice, this list of conditions and the following disclaimer in the 56 * documentation and/or other materials provided with the distribution. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 59 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 60 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 61 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 62 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 63 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 64 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 65 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 66 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 67 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 68 */ 69 70 71 #include <sys/cdefs.h> 72 __KERNEL_RCSID(0, "$NetBSD: x86_xpmap.c,v 1.35 2011/11/06 11:40:47 cherry Exp $"); 73 74 #include "opt_xen.h" 75 #include "opt_ddb.h" 76 #include "ksyms.h" 77 78 #include <sys/param.h> 79 #include <sys/systm.h> 80 #include <sys/simplelock.h> 81 82 #include <uvm/uvm.h> 83 84 #include <machine/pmap.h> 85 #include <machine/gdt.h> 86 #include <xen/xenfunc.h> 87 88 #include <dev/isa/isareg.h> 89 #include <machine/isa_machdep.h> 90 91 #undef XENDEBUG 92 /* #define XENDEBUG_SYNC */ 93 /* #define XENDEBUG_LOW */ 94 95 #ifdef XENDEBUG 96 #define XENPRINTF(x) printf x 97 #define XENPRINTK(x) printk x 98 #define XENPRINTK2(x) /* printk x */ 99 100 static char XBUF[256]; 101 #else 102 #define XENPRINTF(x) 103 #define XENPRINTK(x) 104 #define XENPRINTK2(x) 105 #endif 106 #define PRINTF(x) printf x 107 #define PRINTK(x) printk x 108 109 /* on x86_64 kernel runs in ring 3 */ 110 #ifdef __x86_64__ 111 #define PG_k PG_u 112 #else 113 #define PG_k 0 114 #endif 115 116 volatile shared_info_t *HYPERVISOR_shared_info; 117 /* Xen requires the start_info struct to be page aligned */ 118 union start_info_union start_info_union __aligned(PAGE_SIZE); 119 unsigned long *xpmap_phys_to_machine_mapping; 120 121 void xen_failsafe_handler(void); 122 123 #define HYPERVISOR_mmu_update_self(req, count, success_count) \ 124 HYPERVISOR_mmu_update((req), (count), (success_count), DOMID_SELF) 125 126 void 127 xen_failsafe_handler(void) 128 { 129 130 panic("xen_failsafe_handler called!\n"); 131 } 132 133 134 void 135 xen_set_ldt(vaddr_t base, uint32_t entries) 136 { 137 vaddr_t va; 138 vaddr_t end; 139 pt_entry_t *ptp; 140 int s; 141 142 #ifdef __x86_64__ 143 end = base + (entries << 3); 144 #else 145 end = base + entries * sizeof(union descriptor); 146 #endif 147 148 for (va = base; va < end; va += PAGE_SIZE) { 149 KASSERT(va >= VM_MIN_KERNEL_ADDRESS); 150 ptp = kvtopte(va); 151 XENPRINTF(("xen_set_ldt %#" PRIxVADDR " %d %p\n", 152 base, entries, ptp)); 153 pmap_pte_clearbits(ptp, PG_RW); 154 } 155 s = splvm(); 156 xpq_queue_set_ldt(base, entries); 157 splx(s); 158 } 159 160 #ifdef XENDEBUG 161 void xpq_debug_dump(void); 162 #endif 163 164 #define XPQUEUE_SIZE 2048 165 static mmu_update_t xpq_queue_array[MAXCPUS][XPQUEUE_SIZE]; 166 static int xpq_idx_array[MAXCPUS]; 167 168 extern struct cpu_info * (*xpq_cpu)(void); 169 170 void 171 xpq_flush_queue(void) 172 { 173 int i, ok = 0, ret; 174 175 mmu_update_t *xpq_queue = xpq_queue_array[xpq_cpu()->ci_cpuid]; 176 int xpq_idx = xpq_idx_array[xpq_cpu()->ci_cpuid]; 177 178 XENPRINTK2(("flush queue %p entries %d\n", xpq_queue, xpq_idx)); 179 for (i = 0; i < xpq_idx; i++) 180 XENPRINTK2(("%d: 0x%08" PRIx64 " 0x%08" PRIx64 "\n", i, 181 xpq_queue[i].ptr, xpq_queue[i].val)); 182 183 retry: 184 ret = HYPERVISOR_mmu_update_self(xpq_queue, xpq_idx, &ok); 185 186 if (xpq_idx != 0 && ret < 0) { 187 printf("xpq_flush_queue: %d entries (%d successful)\n", 188 xpq_idx, ok); 189 190 if (ok != 0) { 191 xpq_queue += ok; 192 xpq_idx -= ok; 193 ok = 0; 194 goto retry; 195 } 196 197 for (i = 0; i < xpq_idx; i++) 198 printf("0x%016" PRIx64 ": 0x%016" PRIx64 "\n", 199 xpq_queue[i].ptr, xpq_queue[i].val); 200 panic("HYPERVISOR_mmu_update failed, ret: %d\n", ret); 201 } 202 xpq_idx_array[xpq_cpu()->ci_cpuid] = 0; 203 } 204 205 static inline void 206 xpq_increment_idx(void) 207 { 208 209 if (__predict_false(++xpq_idx_array[xpq_cpu()->ci_cpuid] == XPQUEUE_SIZE)) 210 xpq_flush_queue(); 211 } 212 213 void 214 xpq_queue_machphys_update(paddr_t ma, paddr_t pa) 215 { 216 217 mmu_update_t *xpq_queue = xpq_queue_array[xpq_cpu()->ci_cpuid]; 218 int xpq_idx = xpq_idx_array[xpq_cpu()->ci_cpuid]; 219 220 XENPRINTK2(("xpq_queue_machphys_update ma=0x%" PRIx64 " pa=0x%" PRIx64 221 "\n", (int64_t)ma, (int64_t)pa)); 222 223 xpq_queue[xpq_idx].ptr = ma | MMU_MACHPHYS_UPDATE; 224 xpq_queue[xpq_idx].val = (pa - XPMAP_OFFSET) >> PAGE_SHIFT; 225 xpq_increment_idx(); 226 #ifdef XENDEBUG_SYNC 227 xpq_flush_queue(); 228 #endif 229 } 230 231 void 232 xpq_queue_pte_update(paddr_t ptr, pt_entry_t val) 233 { 234 235 mmu_update_t *xpq_queue = xpq_queue_array[xpq_cpu()->ci_cpuid]; 236 int xpq_idx = xpq_idx_array[xpq_cpu()->ci_cpuid]; 237 238 KASSERT((ptr & 3) == 0); 239 xpq_queue[xpq_idx].ptr = (paddr_t)ptr | MMU_NORMAL_PT_UPDATE; 240 xpq_queue[xpq_idx].val = val; 241 xpq_increment_idx(); 242 #ifdef XENDEBUG_SYNC 243 xpq_flush_queue(); 244 #endif 245 } 246 247 void 248 xpq_queue_pt_switch(paddr_t pa) 249 { 250 struct mmuext_op op; 251 xpq_flush_queue(); 252 253 XENPRINTK2(("xpq_queue_pt_switch: 0x%" PRIx64 " 0x%" PRIx64 "\n", 254 (int64_t)pa, (int64_t)pa)); 255 op.cmd = MMUEXT_NEW_BASEPTR; 256 op.arg1.mfn = pa >> PAGE_SHIFT; 257 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) 258 panic("xpq_queue_pt_switch"); 259 } 260 261 void 262 xpq_queue_pin_table(paddr_t pa, int lvl) 263 { 264 struct mmuext_op op; 265 266 xpq_flush_queue(); 267 268 XENPRINTK2(("xpq_queue_pin_l%d_table: %#" PRIxPADDR "\n", 269 lvl + 1, pa)); 270 271 op.arg1.mfn = pa >> PAGE_SHIFT; 272 op.cmd = lvl; 273 274 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) 275 panic("xpq_queue_pin_table"); 276 } 277 278 void 279 xpq_queue_unpin_table(paddr_t pa) 280 { 281 struct mmuext_op op; 282 283 xpq_flush_queue(); 284 285 XENPRINTK2(("xpq_queue_unpin_table: %#" PRIxPADDR "\n", pa)); 286 op.arg1.mfn = pa >> PAGE_SHIFT; 287 op.cmd = MMUEXT_UNPIN_TABLE; 288 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) 289 panic("xpq_queue_unpin_table"); 290 } 291 292 void 293 xpq_queue_set_ldt(vaddr_t va, uint32_t entries) 294 { 295 struct mmuext_op op; 296 297 xpq_flush_queue(); 298 299 XENPRINTK2(("xpq_queue_set_ldt\n")); 300 KASSERT(va == (va & ~PAGE_MASK)); 301 op.cmd = MMUEXT_SET_LDT; 302 op.arg1.linear_addr = va; 303 op.arg2.nr_ents = entries; 304 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) 305 panic("xpq_queue_set_ldt"); 306 } 307 308 void 309 xpq_queue_tlb_flush(void) 310 { 311 struct mmuext_op op; 312 313 xpq_flush_queue(); 314 315 XENPRINTK2(("xpq_queue_tlb_flush\n")); 316 op.cmd = MMUEXT_TLB_FLUSH_LOCAL; 317 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) 318 panic("xpq_queue_tlb_flush"); 319 } 320 321 void 322 xpq_flush_cache(void) 323 { 324 struct mmuext_op op; 325 int s = splvm(), err; 326 327 xpq_flush_queue(); 328 329 XENPRINTK2(("xpq_queue_flush_cache\n")); 330 op.cmd = MMUEXT_FLUSH_CACHE; 331 if ((err = HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF)) < 0) { 332 panic("xpq_flush_cache, err %d", err); 333 } 334 splx(s); /* XXX: removeme */ 335 } 336 337 void 338 xpq_queue_invlpg(vaddr_t va) 339 { 340 struct mmuext_op op; 341 xpq_flush_queue(); 342 343 XENPRINTK2(("xpq_queue_invlpg %#" PRIxVADDR "\n", va)); 344 op.cmd = MMUEXT_INVLPG_LOCAL; 345 op.arg1.linear_addr = (va & ~PAGE_MASK); 346 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) 347 panic("xpq_queue_invlpg"); 348 } 349 350 void 351 xen_mcast_invlpg(vaddr_t va, uint32_t cpumask) 352 { 353 mmuext_op_t op; 354 355 /* Flush pending page updates */ 356 xpq_flush_queue(); 357 358 op.cmd = MMUEXT_INVLPG_MULTI; 359 op.arg1.linear_addr = va; 360 op.arg2.vcpumask = &cpumask; 361 362 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) { 363 panic("xpq_queue_invlpg_all"); 364 } 365 366 return; 367 } 368 369 void 370 xen_bcast_invlpg(vaddr_t va) 371 { 372 mmuext_op_t op; 373 374 /* Flush pending page updates */ 375 xpq_flush_queue(); 376 377 op.cmd = MMUEXT_INVLPG_ALL; 378 op.arg1.linear_addr = va; 379 380 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) { 381 panic("xpq_queue_invlpg_all"); 382 } 383 384 return; 385 } 386 387 /* This is a synchronous call. */ 388 void 389 xen_mcast_tlbflush(uint32_t cpumask) 390 { 391 mmuext_op_t op; 392 393 /* Flush pending page updates */ 394 xpq_flush_queue(); 395 396 op.cmd = MMUEXT_TLB_FLUSH_MULTI; 397 op.arg2.vcpumask = &cpumask; 398 399 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) { 400 panic("xpq_queue_invlpg_all"); 401 } 402 403 return; 404 } 405 406 /* This is a synchronous call. */ 407 void 408 xen_bcast_tlbflush(void) 409 { 410 mmuext_op_t op; 411 412 /* Flush pending page updates */ 413 xpq_flush_queue(); 414 415 op.cmd = MMUEXT_TLB_FLUSH_ALL; 416 417 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) { 418 panic("xpq_queue_invlpg_all"); 419 } 420 421 return; 422 } 423 424 /* This is a synchronous call. */ 425 void 426 xen_vcpu_mcast_invlpg(vaddr_t sva, vaddr_t eva, uint32_t cpumask) 427 { 428 KASSERT(eva > sva); 429 430 /* Flush pending page updates */ 431 xpq_flush_queue(); 432 433 /* Align to nearest page boundary */ 434 sva &= ~PAGE_MASK; 435 eva &= ~PAGE_MASK; 436 437 for ( ; sva <= eva; sva += PAGE_SIZE) { 438 xen_mcast_invlpg(sva, cpumask); 439 } 440 441 return; 442 } 443 444 /* This is a synchronous call. */ 445 void 446 xen_vcpu_bcast_invlpg(vaddr_t sva, vaddr_t eva) 447 { 448 KASSERT(eva > sva); 449 450 /* Flush pending page updates */ 451 xpq_flush_queue(); 452 453 /* Align to nearest page boundary */ 454 sva &= ~PAGE_MASK; 455 eva &= ~PAGE_MASK; 456 457 for ( ; sva <= eva; sva += PAGE_SIZE) { 458 xen_bcast_invlpg(sva); 459 } 460 461 return; 462 } 463 464 int 465 xpq_update_foreign(paddr_t ptr, pt_entry_t val, int dom) 466 { 467 mmu_update_t op; 468 int ok; 469 470 xpq_flush_queue(); 471 472 op.ptr = ptr; 473 op.val = val; 474 if (HYPERVISOR_mmu_update(&op, 1, &ok, dom) < 0) 475 return EFAULT; 476 return (0); 477 } 478 479 #ifdef XENDEBUG 480 void 481 xpq_debug_dump(void) 482 { 483 int i; 484 485 mmu_update_t *xpq_queue = xpq_queue_array[xpq_cpu()->ci_cpuid]; 486 int xpq_idx = xpq_idx_array[xpq_cpu()->ci_cpuid]; 487 488 XENPRINTK2(("idx: %d\n", xpq_idx)); 489 for (i = 0; i < xpq_idx; i++) { 490 snprintf(XBUF, sizeof(XBUF), "%" PRIx64 " %08" PRIx64, 491 xpq_queue[i].ptr, xpq_queue[i].val); 492 if (++i < xpq_idx) 493 snprintf(XBUF + strlen(XBUF), 494 sizeof(XBUF) - strlen(XBUF), 495 "%" PRIx64 " %08" PRIx64, 496 xpq_queue[i].ptr, xpq_queue[i].val); 497 if (++i < xpq_idx) 498 snprintf(XBUF + strlen(XBUF), 499 sizeof(XBUF) - strlen(XBUF), 500 "%" PRIx64 " %08" PRIx64, 501 xpq_queue[i].ptr, xpq_queue[i].val); 502 if (++i < xpq_idx) 503 snprintf(XBUF + strlen(XBUF), 504 sizeof(XBUF) - strlen(XBUF), 505 "%" PRIx64 " %08" PRIx64, 506 xpq_queue[i].ptr, xpq_queue[i].val); 507 XENPRINTK2(("%d: %s\n", xpq_idx, XBUF)); 508 } 509 } 510 #endif 511 512 513 extern volatile struct xencons_interface *xencons_interface; /* XXX */ 514 extern struct xenstore_domain_interface *xenstore_interface; /* XXX */ 515 516 static void xen_bt_set_readonly (vaddr_t); 517 static void xen_bootstrap_tables (vaddr_t, vaddr_t, int, int, int); 518 519 /* How many PDEs ? */ 520 #if L2_SLOT_KERNBASE > 0 521 #define TABLE_L2_ENTRIES (2 * (NKL2_KIMG_ENTRIES + 1)) 522 #else 523 #define TABLE_L2_ENTRIES (NKL2_KIMG_ENTRIES + 1) 524 #endif 525 526 /* 527 * Construct and switch to new pagetables 528 * first_avail is the first vaddr we can use after 529 * we get rid of Xen pagetables 530 */ 531 532 vaddr_t xen_pmap_bootstrap (void); 533 534 /* 535 * Function to get rid of Xen bootstrap tables 536 */ 537 538 /* How many PDP do we need: */ 539 #ifdef PAE 540 /* 541 * For PAE, we consider a single contigous L2 "superpage" of 4 pages, 542 * all of them mapped by the L3 page. We also need a shadow page 543 * for L3[3]. 544 */ 545 static const int l2_4_count = 6; 546 #else 547 static const int l2_4_count = PTP_LEVELS - 1; 548 #endif 549 550 vaddr_t 551 xen_pmap_bootstrap(void) 552 { 553 int count, oldcount; 554 long mapsize; 555 vaddr_t bootstrap_tables, init_tables; 556 557 memset(xpq_idx_array, 0, sizeof xpq_idx_array); 558 559 xpmap_phys_to_machine_mapping = 560 (unsigned long *)xen_start_info.mfn_list; 561 init_tables = xen_start_info.pt_base; 562 __PRINTK(("xen_arch_pmap_bootstrap init_tables=0x%lx\n", init_tables)); 563 564 /* Space after Xen boostrap tables should be free */ 565 bootstrap_tables = xen_start_info.pt_base + 566 (xen_start_info.nr_pt_frames * PAGE_SIZE); 567 568 /* 569 * Calculate how many space we need 570 * first everything mapped before the Xen bootstrap tables 571 */ 572 mapsize = init_tables - KERNTEXTOFF; 573 /* after the tables we'll have: 574 * - UAREA 575 * - dummy user PGD (x86_64) 576 * - HYPERVISOR_shared_info 577 * - ISA I/O mem (if needed) 578 */ 579 mapsize += UPAGES * NBPG; 580 #ifdef __x86_64__ 581 mapsize += NBPG; 582 #endif 583 mapsize += NBPG; 584 585 #ifdef DOM0OPS 586 if (xendomain_is_dom0()) { 587 /* space for ISA I/O mem */ 588 mapsize += IOM_SIZE; 589 } 590 #endif 591 /* at this point mapsize doens't include the table size */ 592 593 #ifdef __x86_64__ 594 count = TABLE_L2_ENTRIES; 595 #else 596 count = (mapsize + (NBPD_L2 -1)) >> L2_SHIFT; 597 #endif /* __x86_64__ */ 598 599 /* now compute how many L2 pages we need exactly */ 600 XENPRINTK(("bootstrap_final mapsize 0x%lx count %d\n", mapsize, count)); 601 while (mapsize + (count + l2_4_count) * PAGE_SIZE + KERNTEXTOFF > 602 ((long)count << L2_SHIFT) + KERNBASE) { 603 count++; 604 } 605 #ifndef __x86_64__ 606 /* 607 * one more L2 page: we'll alocate several pages after kva_start 608 * in pmap_bootstrap() before pmap_growkernel(), which have not been 609 * counted here. It's not a big issue to allocate one more L2 as 610 * pmap_growkernel() will be called anyway. 611 */ 612 count++; 613 nkptp[1] = count; 614 #endif 615 616 /* 617 * install bootstrap pages. We may need more L2 pages than will 618 * have the final table here, as it's installed after the final table 619 */ 620 oldcount = count; 621 622 bootstrap_again: 623 XENPRINTK(("bootstrap_again oldcount %d\n", oldcount)); 624 /* 625 * Xen space we'll reclaim may not be enough for our new page tables, 626 * move bootstrap tables if necessary 627 */ 628 if (bootstrap_tables < init_tables + ((count + l2_4_count) * PAGE_SIZE)) 629 bootstrap_tables = init_tables + 630 ((count + l2_4_count) * PAGE_SIZE); 631 /* make sure we have enough to map the bootstrap_tables */ 632 if (bootstrap_tables + ((oldcount + l2_4_count) * PAGE_SIZE) > 633 ((long)oldcount << L2_SHIFT) + KERNBASE) { 634 oldcount++; 635 goto bootstrap_again; 636 } 637 638 /* Create temporary tables */ 639 xen_bootstrap_tables(xen_start_info.pt_base, bootstrap_tables, 640 xen_start_info.nr_pt_frames, oldcount, 0); 641 642 /* Create final tables */ 643 xen_bootstrap_tables(bootstrap_tables, init_tables, 644 oldcount + l2_4_count, count, 1); 645 646 /* zero out free space after tables */ 647 memset((void *)(init_tables + ((count + l2_4_count) * PAGE_SIZE)), 0, 648 (UPAGES + 1) * NBPG); 649 650 /* Finally, flush TLB. */ 651 xpq_queue_tlb_flush(); 652 653 return (init_tables + ((count + l2_4_count) * PAGE_SIZE)); 654 } 655 656 /* 657 * Build a new table and switch to it 658 * old_count is # of old tables (including PGD, PDTPE and PDE) 659 * new_count is # of new tables (PTE only) 660 * we assume areas don't overlap 661 */ 662 static void 663 xen_bootstrap_tables (vaddr_t old_pgd, vaddr_t new_pgd, 664 int old_count, int new_count, int final) 665 { 666 pd_entry_t *pdtpe, *pde, *pte; 667 pd_entry_t *cur_pgd, *bt_pgd; 668 paddr_t addr; 669 vaddr_t page, avail, text_end, map_end; 670 int i; 671 extern char __data_start; 672 673 __PRINTK(("xen_bootstrap_tables(%#" PRIxVADDR ", %#" PRIxVADDR "," 674 " %d, %d)\n", 675 old_pgd, new_pgd, old_count, new_count)); 676 text_end = ((vaddr_t)&__data_start) & ~PAGE_MASK; 677 /* 678 * size of R/W area after kernel text: 679 * xencons_interface (if present) 680 * xenstore_interface (if present) 681 * table pages (new_count + l2_4_count entries) 682 * extra mappings (only when final is true): 683 * UAREA 684 * dummy user PGD (x86_64 only)/gdt page (i386 only) 685 * HYPERVISOR_shared_info 686 * ISA I/O mem (if needed) 687 */ 688 map_end = new_pgd + ((new_count + l2_4_count) * NBPG); 689 if (final) { 690 map_end += (UPAGES + 1) * NBPG; 691 HYPERVISOR_shared_info = (shared_info_t *)map_end; 692 map_end += NBPG; 693 } 694 /* 695 * we always set atdevbase, as it's used by init386 to find the first 696 * available VA. map_end is updated only if we are dom0, so 697 * atdevbase -> atdevbase + IOM_SIZE will be mapped only in 698 * this case. 699 */ 700 if (final) 701 atdevbase = map_end; 702 #ifdef DOM0OPS 703 if (final && xendomain_is_dom0()) { 704 /* ISA I/O mem */ 705 map_end += IOM_SIZE; 706 } 707 #endif /* DOM0OPS */ 708 709 __PRINTK(("xen_bootstrap_tables text_end 0x%lx map_end 0x%lx\n", 710 text_end, map_end)); 711 __PRINTK(("console %#lx ", xen_start_info.console_mfn)); 712 __PRINTK(("xenstore %#" PRIx32 "\n", xen_start_info.store_mfn)); 713 714 /* 715 * Create bootstrap page tables 716 * What we need: 717 * - a PGD (level 4) 718 * - a PDTPE (level 3) 719 * - a PDE (level2) 720 * - some PTEs (level 1) 721 */ 722 723 cur_pgd = (pd_entry_t *) old_pgd; 724 bt_pgd = (pd_entry_t *) new_pgd; 725 memset (bt_pgd, 0, PAGE_SIZE); 726 avail = new_pgd + PAGE_SIZE; 727 #if PTP_LEVELS > 3 728 /* Install level 3 */ 729 pdtpe = (pd_entry_t *) avail; 730 memset (pdtpe, 0, PAGE_SIZE); 731 avail += PAGE_SIZE; 732 733 addr = ((u_long) pdtpe) - KERNBASE; 734 bt_pgd[pl4_pi(KERNTEXTOFF)] = 735 xpmap_ptom_masked(addr) | PG_k | PG_RW | PG_V; 736 737 __PRINTK(("L3 va %#lx pa %#" PRIxPADDR " entry %#" PRIxPADDR 738 " -> L4[%#x]\n", 739 pdtpe, addr, bt_pgd[pl4_pi(KERNTEXTOFF)], pl4_pi(KERNTEXTOFF))); 740 #else 741 pdtpe = bt_pgd; 742 #endif /* PTP_LEVELS > 3 */ 743 744 #if PTP_LEVELS > 2 745 /* Level 2 */ 746 pde = (pd_entry_t *) avail; 747 memset(pde, 0, PAGE_SIZE); 748 avail += PAGE_SIZE; 749 750 addr = ((u_long) pde) - KERNBASE; 751 pdtpe[pl3_pi(KERNTEXTOFF)] = 752 xpmap_ptom_masked(addr) | PG_k | PG_V | PG_RW; 753 __PRINTK(("L2 va %#lx pa %#" PRIxPADDR " entry %#" PRIxPADDR 754 " -> L3[%#x]\n", 755 pde, addr, pdtpe[pl3_pi(KERNTEXTOFF)], pl3_pi(KERNTEXTOFF))); 756 #elif defined(PAE) 757 /* our PAE-style level 2: 5 contigous pages (4 L2 + 1 shadow) */ 758 pde = (pd_entry_t *) avail; 759 memset(pde, 0, PAGE_SIZE * 5); 760 avail += PAGE_SIZE * 5; 761 addr = ((u_long) pde) - KERNBASE; 762 /* 763 * enter L2 pages in the L3. 764 * The real L2 kernel PD will be the last one (so that 765 * pde[L2_SLOT_KERN] always point to the shadow). 766 */ 767 for (i = 0; i < 3; i++, addr += PAGE_SIZE) { 768 /* 769 * Xen doesn't want R/W mappings in L3 entries, it'll add it 770 * itself. 771 */ 772 pdtpe[i] = xpmap_ptom_masked(addr) | PG_k | PG_V; 773 __PRINTK(("L2 va %#lx pa %#" PRIxPADDR " entry %#" PRIxPADDR 774 " -> L3[%#x]\n", 775 (vaddr_t)pde + PAGE_SIZE * i, addr, pdtpe[i], i)); 776 } 777 addr += PAGE_SIZE; 778 pdtpe[3] = xpmap_ptom_masked(addr) | PG_k | PG_V; 779 __PRINTK(("L2 va %#lx pa %#" PRIxPADDR " entry %#" PRIxPADDR 780 " -> L3[%#x]\n", 781 (vaddr_t)pde + PAGE_SIZE * 4, addr, pdtpe[3], 3)); 782 783 #else /* PAE */ 784 pde = bt_pgd; 785 #endif /* PTP_LEVELS > 2 */ 786 787 /* Level 1 */ 788 page = KERNTEXTOFF; 789 for (i = 0; i < new_count; i ++) { 790 vaddr_t cur_page = page; 791 792 pte = (pd_entry_t *) avail; 793 avail += PAGE_SIZE; 794 795 memset(pte, 0, PAGE_SIZE); 796 while (pl2_pi(page) == pl2_pi (cur_page)) { 797 if (page >= map_end) { 798 /* not mapped at all */ 799 pte[pl1_pi(page)] = 0; 800 page += PAGE_SIZE; 801 continue; 802 } 803 pte[pl1_pi(page)] = xpmap_ptom_masked(page - KERNBASE); 804 if (page == (vaddr_t)HYPERVISOR_shared_info) { 805 pte[pl1_pi(page)] = xen_start_info.shared_info; 806 __PRINTK(("HYPERVISOR_shared_info " 807 "va %#lx pte %#" PRIxPADDR "\n", 808 HYPERVISOR_shared_info, pte[pl1_pi(page)])); 809 } 810 if ((xpmap_ptom_masked(page - KERNBASE) >> PAGE_SHIFT) 811 == xen_start_info.console.domU.mfn) { 812 xencons_interface = (void *)page; 813 pte[pl1_pi(page)] = xen_start_info.console_mfn; 814 pte[pl1_pi(page)] <<= PAGE_SHIFT; 815 __PRINTK(("xencons_interface " 816 "va %#lx pte %#" PRIxPADDR "\n", 817 xencons_interface, pte[pl1_pi(page)])); 818 } 819 if ((xpmap_ptom_masked(page - KERNBASE) >> PAGE_SHIFT) 820 == xen_start_info.store_mfn) { 821 xenstore_interface = (void *)page; 822 pte[pl1_pi(page)] = xen_start_info.store_mfn; 823 pte[pl1_pi(page)] <<= PAGE_SHIFT; 824 __PRINTK(("xenstore_interface " 825 "va %#lx pte %#" PRIxPADDR "\n", 826 xenstore_interface, pte[pl1_pi(page)])); 827 } 828 #ifdef DOM0OPS 829 if (page >= (vaddr_t)atdevbase && 830 page < (vaddr_t)atdevbase + IOM_SIZE) { 831 pte[pl1_pi(page)] = 832 IOM_BEGIN + (page - (vaddr_t)atdevbase); 833 } 834 #endif 835 pte[pl1_pi(page)] |= PG_k | PG_V; 836 if (page < text_end) { 837 /* map kernel text RO */ 838 pte[pl1_pi(page)] |= 0; 839 } else if (page >= old_pgd 840 && page < old_pgd + (old_count * PAGE_SIZE)) { 841 /* map old page tables RO */ 842 pte[pl1_pi(page)] |= 0; 843 } else if (page >= new_pgd && 844 page < new_pgd + ((new_count + l2_4_count) * PAGE_SIZE)) { 845 /* map new page tables RO */ 846 pte[pl1_pi(page)] |= 0; 847 } else { 848 /* map page RW */ 849 pte[pl1_pi(page)] |= PG_RW; 850 } 851 852 if ((page >= old_pgd && page < old_pgd + (old_count * PAGE_SIZE)) 853 || page >= new_pgd) { 854 __PRINTK(("va %#lx pa %#lx " 855 "entry 0x%" PRIxPADDR " -> L1[%#x]\n", 856 page, page - KERNBASE, 857 pte[pl1_pi(page)], pl1_pi(page))); 858 } 859 page += PAGE_SIZE; 860 } 861 862 addr = ((u_long) pte) - KERNBASE; 863 pde[pl2_pi(cur_page)] = 864 xpmap_ptom_masked(addr) | PG_k | PG_RW | PG_V; 865 __PRINTK(("L1 va %#lx pa %#" PRIxPADDR " entry %#" PRIxPADDR 866 " -> L2[%#x]\n", 867 pte, addr, pde[pl2_pi(cur_page)], pl2_pi(cur_page))); 868 /* Mark readonly */ 869 xen_bt_set_readonly((vaddr_t) pte); 870 } 871 872 /* Install recursive page tables mapping */ 873 #ifdef PAE 874 /* 875 * we need a shadow page for the kernel's L2 page 876 * The real L2 kernel PD will be the last one (so that 877 * pde[L2_SLOT_KERN] always point to the shadow. 878 */ 879 memcpy(&pde[L2_SLOT_KERN + NPDPG], &pde[L2_SLOT_KERN], PAGE_SIZE); 880 pmap_kl2pd = &pde[L2_SLOT_KERN + NPDPG]; 881 pmap_kl2paddr = (u_long)pmap_kl2pd - KERNBASE; 882 883 /* 884 * We don't enter a recursive entry from the L3 PD. Instead, 885 * we enter the first 4 L2 pages, which includes the kernel's L2 886 * shadow. But we have to entrer the shadow after switching 887 * %cr3, or Xen will refcount some PTE with the wrong type. 888 */ 889 addr = (u_long)pde - KERNBASE; 890 for (i = 0; i < 3; i++, addr += PAGE_SIZE) { 891 pde[PDIR_SLOT_PTE + i] = xpmap_ptom_masked(addr) | PG_k | PG_V; 892 __PRINTK(("pde[%d] va %#" PRIxVADDR " pa %#" PRIxPADDR 893 " entry %#" PRIxPADDR "\n", 894 (int)(PDIR_SLOT_PTE + i), pde + PAGE_SIZE * i, 895 addr, pde[PDIR_SLOT_PTE + i])); 896 } 897 #if 0 898 addr += PAGE_SIZE; /* point to shadow L2 */ 899 pde[PDIR_SLOT_PTE + 3] = xpmap_ptom_masked(addr) | PG_k | PG_V; 900 __PRINTK(("pde[%d] va 0x%lx pa 0x%lx entry 0x%" PRIx64 "\n", 901 (int)(PDIR_SLOT_PTE + 3), pde + PAGE_SIZE * 4, (long)addr, 902 (int64_t)pde[PDIR_SLOT_PTE + 3])); 903 #endif 904 /* Mark tables RO, and pin the kernel's shadow as L2 */ 905 addr = (u_long)pde - KERNBASE; 906 for (i = 0; i < 5; i++, addr += PAGE_SIZE) { 907 xen_bt_set_readonly(((vaddr_t)pde) + PAGE_SIZE * i); 908 if (i == 2 || i == 3) 909 continue; 910 #if 0 911 __PRINTK(("pin L2 %d addr 0x%" PRIx64 "\n", i, (int64_t)addr)); 912 xpq_queue_pin_l2_table(xpmap_ptom_masked(addr)); 913 #endif 914 } 915 if (final) { 916 addr = (u_long)pde - KERNBASE + 3 * PAGE_SIZE; 917 __PRINTK(("pin L2 %d addr %#" PRIxPADDR "\n", 2, addr)); 918 xpq_queue_pin_l2_table(xpmap_ptom_masked(addr)); 919 } 920 #if 0 921 addr = (u_long)pde - KERNBASE + 2 * PAGE_SIZE; 922 __PRINTK(("pin L2 %d addr 0x%" PRIx64 "\n", 2, (int64_t)addr)); 923 xpq_queue_pin_l2_table(xpmap_ptom_masked(addr)); 924 #endif 925 #else /* PAE */ 926 /* recursive entry in higher-level PD */ 927 bt_pgd[PDIR_SLOT_PTE] = 928 xpmap_ptom_masked(new_pgd - KERNBASE) | PG_k | PG_V; 929 __PRINTK(("bt_pgd[PDIR_SLOT_PTE] va %#" PRIxVADDR " pa %#" PRIxPADDR 930 " entry %#" PRIxPADDR "\n", new_pgd, (paddr_t)new_pgd - KERNBASE, 931 bt_pgd[PDIR_SLOT_PTE])); 932 /* Mark tables RO */ 933 xen_bt_set_readonly((vaddr_t) pde); 934 #endif 935 #if PTP_LEVELS > 2 || defined(PAE) 936 xen_bt_set_readonly((vaddr_t) pdtpe); 937 #endif 938 #if PTP_LEVELS > 3 939 xen_bt_set_readonly(new_pgd); 940 #endif 941 /* Pin the PGD */ 942 __PRINTK(("pin PGD: %"PRIxVADDR"\n", new_pgd - KERNBASE)); 943 #ifdef __x86_64__ 944 xpq_queue_pin_l4_table(xpmap_ptom_masked(new_pgd - KERNBASE)); 945 #elif PAE 946 xpq_queue_pin_l3_table(xpmap_ptom_masked(new_pgd - KERNBASE)); 947 #else 948 xpq_queue_pin_l2_table(xpmap_ptom_masked(new_pgd - KERNBASE)); 949 #endif 950 951 /* Save phys. addr of PDP, for libkvm. */ 952 #ifdef PAE 953 PDPpaddr = (u_long)pde - KERNBASE; /* PDP is the L2 with PAE */ 954 #else 955 PDPpaddr = (u_long)new_pgd - KERNBASE; 956 #endif 957 958 /* Switch to new tables */ 959 __PRINTK(("switch to PGD\n")); 960 xpq_queue_pt_switch(xpmap_ptom_masked(new_pgd - KERNBASE)); 961 __PRINTK(("bt_pgd[PDIR_SLOT_PTE] now entry %#" PRIxPADDR "\n", 962 bt_pgd[PDIR_SLOT_PTE])); 963 964 #ifdef PAE 965 if (final) { 966 /* save the address of the L3 page */ 967 cpu_info_primary.ci_pae_l3_pdir = pdtpe; 968 cpu_info_primary.ci_pae_l3_pdirpa = (new_pgd - KERNBASE); 969 970 /* now enter kernel's PTE mappings */ 971 addr = (u_long)pde - KERNBASE + PAGE_SIZE * 3; 972 xpq_queue_pte_update( 973 xpmap_ptom(((vaddr_t)&pde[PDIR_SLOT_PTE + 3]) - KERNBASE), 974 xpmap_ptom_masked(addr) | PG_k | PG_V); 975 xpq_flush_queue(); 976 } 977 #endif 978 979 /* Now we can safely reclaim space taken by old tables */ 980 981 __PRINTK(("unpin old PGD\n")); 982 /* Unpin old PGD */ 983 xpq_queue_unpin_table(xpmap_ptom_masked(old_pgd - KERNBASE)); 984 /* Mark old tables RW */ 985 page = old_pgd; 986 addr = (paddr_t) pde[pl2_pi(page)] & PG_FRAME; 987 addr = xpmap_mtop(addr); 988 pte = (pd_entry_t *) ((u_long)addr + KERNBASE); 989 pte += pl1_pi(page); 990 __PRINTK(("*pde %#" PRIxPADDR " addr %#" PRIxPADDR " pte %#lx\n", 991 pde[pl2_pi(page)], addr, (long)pte)); 992 while (page < old_pgd + (old_count * PAGE_SIZE) && page < map_end) { 993 addr = xpmap_ptom(((u_long) pte) - KERNBASE); 994 XENPRINTK(("addr %#" PRIxPADDR " pte %#lx " 995 "*pte %#" PRIxPADDR "\n", 996 addr, (long)pte, *pte)); 997 xpq_queue_pte_update(addr, *pte | PG_RW); 998 page += PAGE_SIZE; 999 /* 1000 * Our ptes are contiguous 1001 * so it's safe to just "++" here 1002 */ 1003 pte++; 1004 } 1005 xpq_flush_queue(); 1006 } 1007 1008 1009 /* 1010 * Bootstrap helper functions 1011 */ 1012 1013 /* 1014 * Mark a page readonly 1015 * XXX: assuming vaddr = paddr + KERNBASE 1016 */ 1017 1018 static void 1019 xen_bt_set_readonly (vaddr_t page) 1020 { 1021 pt_entry_t entry; 1022 1023 entry = xpmap_ptom_masked(page - KERNBASE); 1024 entry |= PG_k | PG_V; 1025 1026 HYPERVISOR_update_va_mapping (page, entry, UVMF_INVLPG); 1027 } 1028 1029 #ifdef __x86_64__ 1030 void 1031 xen_set_user_pgd(paddr_t page) 1032 { 1033 struct mmuext_op op; 1034 int s = splvm(); 1035 1036 xpq_flush_queue(); 1037 op.cmd = MMUEXT_NEW_USER_BASEPTR; 1038 op.arg1.mfn = pfn_to_mfn(page >> PAGE_SHIFT); 1039 if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0) 1040 panic("xen_set_user_pgd: failed to install new user page" 1041 " directory %#" PRIxPADDR, page); 1042 splx(s); 1043 } 1044 #endif /* __x86_64__ */ 1045
Indexes created Tue Sep 30 07:10:03 GMT 2025