Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/x86/xen/hvm.c
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1 /* 2 * Copyright (c) 2008, 2013 Citrix Systems, Inc. 3 * Copyright (c) 2012 Spectra Logic Corporation 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: releng/10.4/sys/x86/xen/hvm.c 305672 2016-09-09 19:57:32Z jhb $"); 30 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/malloc.h> 35 #include <sys/proc.h> 36 #include <sys/smp.h> 37 #include <sys/systm.h> 38 39 #include <vm/vm.h> 40 #include <vm/pmap.h> 41 42 #include <dev/pci/pcivar.h> 43 44 #include <machine/cpufunc.h> 45 #include <machine/cpu.h> 46 #include <machine/smp.h> 47 48 #include <x86/apicreg.h> 49 50 #include <xen/xen-os.h> 51 #include <xen/features.h> 52 #include <xen/gnttab.h> 53 #include <xen/hypervisor.h> 54 #include <xen/hvm.h> 55 #include <xen/xen_intr.h> 56 57 #include <xen/interface/hvm/params.h> 58 #include <xen/interface/vcpu.h> 59 60 /*--------------------------- Forward Declarations ---------------------------*/ 61 #ifdef SMP 62 static driver_filter_t xen_smp_rendezvous_action; 63 static driver_filter_t xen_invltlb; 64 static driver_filter_t xen_invlpg; 65 static driver_filter_t xen_invlrng; 66 static driver_filter_t xen_invlcache; 67 #ifdef __i386__ 68 static driver_filter_t xen_lazypmap; 69 #endif 70 static driver_filter_t xen_ipi_bitmap_handler; 71 static driver_filter_t xen_cpustop_handler; 72 static driver_filter_t xen_cpususpend_handler; 73 static driver_filter_t xen_cpustophard_handler; 74 static void xen_ipi_vectored(u_int vector, int dest); 75 #endif 76 static void xen_hvm_cpu_init(void); 77 78 /*---------------------------- Extern Declarations ---------------------------*/ 79 #ifdef __i386__ 80 extern void pmap_lazyfix_action(void); 81 #endif 82 #ifdef __amd64__ 83 extern int pmap_pcid_enabled; 84 #endif 85 86 /*---------------------------------- Macros ----------------------------------*/ 87 #define IPI_TO_IDX(ipi) ((ipi) - APIC_IPI_INTS) 88 89 /*-------------------------------- Local Types -------------------------------*/ 90 enum xen_hvm_init_type { 91 XEN_HVM_INIT_COLD, 92 XEN_HVM_INIT_CANCELLED_SUSPEND, 93 XEN_HVM_INIT_RESUME 94 }; 95 96 struct xen_ipi_handler 97 { 98 driver_filter_t *filter; 99 const char *description; 100 }; 101 102 /*-------------------------------- Global Data -------------------------------*/ 103 enum xen_domain_type xen_domain_type = XEN_NATIVE; 104 105 #ifdef SMP 106 struct cpu_ops xen_hvm_cpu_ops = { 107 .ipi_vectored = lapic_ipi_vectored, 108 .cpu_init = xen_hvm_cpu_init, 109 .cpu_resume = xen_hvm_cpu_init 110 }; 111 #endif 112 113 static MALLOC_DEFINE(M_XENHVM, "xen_hvm", "Xen HVM PV Support"); 114 115 #ifdef SMP 116 static struct xen_ipi_handler xen_ipis[] = 117 { 118 [IPI_TO_IDX(IPI_RENDEZVOUS)] = { xen_smp_rendezvous_action, "r" }, 119 [IPI_TO_IDX(IPI_INVLTLB)] = { xen_invltlb, "itlb"}, 120 [IPI_TO_IDX(IPI_INVLPG)] = { xen_invlpg, "ipg" }, 121 [IPI_TO_IDX(IPI_INVLRNG)] = { xen_invlrng, "irg" }, 122 [IPI_TO_IDX(IPI_INVLCACHE)] = { xen_invlcache, "ic" }, 123 #ifdef __i386__ 124 [IPI_TO_IDX(IPI_LAZYPMAP)] = { xen_lazypmap, "lp" }, 125 #endif 126 [IPI_TO_IDX(IPI_BITMAP_VECTOR)] = { xen_ipi_bitmap_handler, "b" }, 127 [IPI_TO_IDX(IPI_STOP)] = { xen_cpustop_handler, "st" }, 128 [IPI_TO_IDX(IPI_SUSPEND)] = { xen_cpususpend_handler, "sp" }, 129 [IPI_TO_IDX(IPI_STOP_HARD)] = { xen_cpustophard_handler, "sth" }, 130 }; 131 #endif 132 133 /** 134 * If non-zero, the hypervisor has been configured to use a direct 135 * IDT event callback for interrupt injection. 136 */ 137 int xen_vector_callback_enabled; 138 139 /*------------------------------- Per-CPU Data -------------------------------*/ 140 DPCPU_DEFINE(struct vcpu_info, vcpu_local_info); 141 DPCPU_DEFINE(struct vcpu_info *, vcpu_info); 142 #ifdef SMP 143 DPCPU_DEFINE(xen_intr_handle_t, ipi_handle[nitems(xen_ipis)]); 144 #endif 145 146 /*------------------ Hypervisor Access Shared Memory Regions -----------------*/ 147 /** Hypercall table accessed via HYPERVISOR_*_op() methods. */ 148 char *hypercall_stubs; 149 shared_info_t *HYPERVISOR_shared_info; 150 151 152 /*------------------------------ Sysctl tunables -----------------------------*/ 153 int xen_disable_pv_disks = 0; 154 int xen_disable_pv_nics = 0; 155 TUNABLE_INT("hw.xen.disable_pv_disks", &xen_disable_pv_disks); 156 TUNABLE_INT("hw.xen.disable_pv_nics", &xen_disable_pv_nics); 157 158 #ifdef SMP 159 /*---------------------------- XEN PV IPI Handlers ---------------------------*/ 160 /* 161 * This are C clones of the ASM functions found in apic_vector.s 162 */ 163 static int 164 xen_ipi_bitmap_handler(void *arg) 165 { 166 struct trapframe *frame; 167 168 frame = arg; 169 ipi_bitmap_handler(*frame); 170 return (FILTER_HANDLED); 171 } 172 173 static int 174 xen_smp_rendezvous_action(void *arg) 175 { 176 #ifdef COUNT_IPIS 177 (*ipi_rendezvous_counts[PCPU_GET(cpuid)])++; 178 #endif /* COUNT_IPIS */ 179 180 smp_rendezvous_action(); 181 return (FILTER_HANDLED); 182 } 183 184 static int 185 xen_invltlb(void *arg) 186 { 187 188 invltlb_handler(); 189 return (FILTER_HANDLED); 190 } 191 192 #ifdef __amd64__ 193 static int 194 xen_invltlb_pcid(void *arg) 195 { 196 197 invltlb_pcid_handler(); 198 return (FILTER_HANDLED); 199 } 200 #endif 201 202 static int 203 xen_invlpg(void *arg) 204 { 205 206 invlpg_handler(); 207 return (FILTER_HANDLED); 208 } 209 210 #ifdef __amd64__ 211 static int 212 xen_invlpg_pcid(void *arg) 213 { 214 215 invlpg_pcid_handler(); 216 return (FILTER_HANDLED); 217 } 218 #endif 219 220 static int 221 xen_invlrng(void *arg) 222 { 223 224 invlrng_handler(); 225 return (FILTER_HANDLED); 226 } 227 228 static int 229 xen_invlcache(void *arg) 230 { 231 232 invlcache_handler(); 233 return (FILTER_HANDLED); 234 } 235 236 #ifdef __i386__ 237 static int 238 xen_lazypmap(void *arg) 239 { 240 241 pmap_lazyfix_action(); 242 return (FILTER_HANDLED); 243 } 244 #endif 245 246 static int 247 xen_cpustop_handler(void *arg) 248 { 249 250 cpustop_handler(); 251 return (FILTER_HANDLED); 252 } 253 254 static int 255 xen_cpususpend_handler(void *arg) 256 { 257 258 cpususpend_handler(); 259 return (FILTER_HANDLED); 260 } 261 262 static int 263 xen_cpustophard_handler(void *arg) 264 { 265 266 ipi_nmi_handler(); 267 return (FILTER_HANDLED); 268 } 269 270 /* Xen PV IPI sender */ 271 static void 272 xen_ipi_vectored(u_int vector, int dest) 273 { 274 xen_intr_handle_t *ipi_handle; 275 int ipi_idx, to_cpu, self; 276 277 ipi_idx = IPI_TO_IDX(vector); 278 if (ipi_idx > nitems(xen_ipis)) 279 panic("IPI out of range"); 280 281 switch(dest) { 282 case APIC_IPI_DEST_SELF: 283 ipi_handle = DPCPU_GET(ipi_handle); 284 xen_intr_signal(ipi_handle[ipi_idx]); 285 break; 286 case APIC_IPI_DEST_ALL: 287 CPU_FOREACH(to_cpu) { 288 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle); 289 xen_intr_signal(ipi_handle[ipi_idx]); 290 } 291 break; 292 case APIC_IPI_DEST_OTHERS: 293 self = PCPU_GET(cpuid); 294 CPU_FOREACH(to_cpu) { 295 if (to_cpu != self) { 296 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle); 297 xen_intr_signal(ipi_handle[ipi_idx]); 298 } 299 } 300 break; 301 default: 302 to_cpu = apic_cpuid(dest); 303 ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle); 304 xen_intr_signal(ipi_handle[ipi_idx]); 305 break; 306 } 307 } 308 309 /*---------------------- XEN diverged cpu operations -------------------------*/ 310 static void 311 xen_cpu_ipi_init(int cpu) 312 { 313 xen_intr_handle_t *ipi_handle; 314 const struct xen_ipi_handler *ipi; 315 device_t dev; 316 int idx, rc; 317 318 ipi_handle = DPCPU_ID_GET(cpu, ipi_handle); 319 dev = pcpu_find(cpu)->pc_device; 320 KASSERT((dev != NULL), ("NULL pcpu device_t")); 321 322 for (ipi = xen_ipis, idx = 0; idx < nitems(xen_ipis); ipi++, idx++) { 323 324 if (ipi->filter == NULL) { 325 ipi_handle[idx] = NULL; 326 continue; 327 } 328 329 rc = xen_intr_alloc_and_bind_ipi(dev, cpu, ipi->filter, 330 INTR_TYPE_TTY, &ipi_handle[idx]); 331 if (rc != 0) 332 panic("Unable to allocate a XEN IPI port"); 333 xen_intr_describe(ipi_handle[idx], "%s", ipi->description); 334 } 335 } 336 337 static void 338 xen_setup_cpus(void) 339 { 340 int i; 341 342 if (!xen_hvm_domain() || !xen_vector_callback_enabled) 343 return; 344 345 #ifdef __amd64__ 346 if (pmap_pcid_enabled) { 347 xen_ipis[IPI_TO_IDX(IPI_INVLTLB)].filter = xen_invltlb_pcid; 348 xen_ipis[IPI_TO_IDX(IPI_INVLPG)].filter = xen_invlpg_pcid; 349 } 350 #endif 351 CPU_FOREACH(i) 352 xen_cpu_ipi_init(i); 353 354 /* Set the xen pv ipi ops to replace the native ones */ 355 cpu_ops.ipi_vectored = xen_ipi_vectored; 356 } 357 #endif 358 359 /*---------------------- XEN Hypervisor Probe and Setup ----------------------*/ 360 static uint32_t 361 xen_hvm_cpuid_base(void) 362 { 363 uint32_t base, regs[4]; 364 365 for (base = 0x40000000; base < 0x40010000; base += 0x100) { 366 do_cpuid(base, regs); 367 if (!memcmp("XenVMMXenVMM", ®s[1], 12) 368 && (regs[0] - base) >= 2) 369 return (base); 370 } 371 return (0); 372 } 373 374 /* 375 * Allocate and fill in the hypcall page. 376 */ 377 static int 378 xen_hvm_init_hypercall_stubs(void) 379 { 380 uint32_t base, regs[4]; 381 int i; 382 383 base = xen_hvm_cpuid_base(); 384 if (base == 0) 385 return (ENXIO); 386 387 if (hypercall_stubs == NULL) { 388 int major, minor; 389 390 do_cpuid(base + 1, regs); 391 392 major = regs[0] >> 16; 393 minor = regs[0] & 0xffff; 394 printf("XEN: Hypervisor version %d.%d detected.\n", major, 395 minor); 396 397 #ifdef SMP 398 if (((major < 4) || (major == 4 && minor <= 5)) && 399 msix_disable_migration == -1) { 400 /* 401 * Xen hypervisors prior to 4.6.0 do not properly 402 * handle updates to enabled MSI-X table entries, 403 * so disable MSI-X interrupt migration in that 404 * case. 405 */ 406 if (bootverbose) 407 printf( 408 "Disabling MSI-X interrupt migration due to Xen hypervisor bug.\n" 409 "Set machdep.msix_disable_migration=0 to forcefully enable it.\n"); 410 msix_disable_migration = 1; 411 } 412 #endif 413 } 414 415 /* 416 * Find the hypercall pages. 417 */ 418 do_cpuid(base + 2, regs); 419 420 if (hypercall_stubs == NULL) { 421 size_t call_region_size; 422 423 call_region_size = regs[0] * PAGE_SIZE; 424 hypercall_stubs = malloc(call_region_size, M_XENHVM, M_NOWAIT); 425 if (hypercall_stubs == NULL) 426 panic("Unable to allocate Xen hypercall region"); 427 } 428 429 for (i = 0; i < regs[0]; i++) 430 wrmsr(regs[1], vtophys(hypercall_stubs + i * PAGE_SIZE) + i); 431 432 return (0); 433 } 434 435 static void 436 xen_hvm_init_shared_info_page(void) 437 { 438 struct xen_add_to_physmap xatp; 439 440 if (HYPERVISOR_shared_info == NULL) { 441 HYPERVISOR_shared_info = malloc(PAGE_SIZE, M_XENHVM, M_NOWAIT); 442 if (HYPERVISOR_shared_info == NULL) 443 panic("Unable to allocate Xen shared info page"); 444 } 445 446 xatp.domid = DOMID_SELF; 447 xatp.idx = 0; 448 xatp.space = XENMAPSPACE_shared_info; 449 xatp.gpfn = vtophys(HYPERVISOR_shared_info) >> PAGE_SHIFT; 450 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 451 panic("HYPERVISOR_memory_op failed"); 452 } 453 454 /* 455 * Tell the hypervisor how to contact us for event channel callbacks. 456 */ 457 void 458 xen_hvm_set_callback(device_t dev) 459 { 460 struct xen_hvm_param xhp; 461 int irq; 462 463 if (xen_vector_callback_enabled) 464 return; 465 466 xhp.domid = DOMID_SELF; 467 xhp.index = HVM_PARAM_CALLBACK_IRQ; 468 if (xen_feature(XENFEAT_hvm_callback_vector) != 0) { 469 int error; 470 471 xhp.value = HVM_CALLBACK_VECTOR(IDT_EVTCHN); 472 error = HYPERVISOR_hvm_op(HVMOP_set_param, &xhp); 473 if (error == 0) { 474 xen_vector_callback_enabled = 1; 475 return; 476 } 477 printf("Xen HVM callback vector registration failed (%d). " 478 "Falling back to emulated device interrupt\n", error); 479 } 480 xen_vector_callback_enabled = 0; 481 if (dev == NULL) { 482 /* 483 * Called from early boot or resume. 484 * xenpci will invoke us again later. 485 */ 486 return; 487 } 488 489 irq = pci_get_irq(dev); 490 if (irq < 16) { 491 xhp.value = HVM_CALLBACK_GSI(irq); 492 } else { 493 u_int slot; 494 u_int pin; 495 496 slot = pci_get_slot(dev); 497 pin = pci_get_intpin(dev) - 1; 498 xhp.value = HVM_CALLBACK_PCI_INTX(slot, pin); 499 } 500 501 if (HYPERVISOR_hvm_op(HVMOP_set_param, &xhp) != 0) 502 panic("Can't set evtchn callback"); 503 } 504 505 #define XEN_MAGIC_IOPORT 0x10 506 enum { 507 XMI_MAGIC = 0x49d2, 508 XMI_UNPLUG_IDE_DISKS = 0x01, 509 XMI_UNPLUG_NICS = 0x02, 510 XMI_UNPLUG_IDE_EXCEPT_PRI_MASTER = 0x04 511 }; 512 513 static void 514 xen_hvm_disable_emulated_devices(void) 515 { 516 u_short disable_devs = 0; 517 518 if (inw(XEN_MAGIC_IOPORT) != XMI_MAGIC) 519 return; 520 521 if (xen_disable_pv_disks == 0) { 522 if (bootverbose) 523 printf("XEN: disabling emulated disks\n"); 524 disable_devs |= XMI_UNPLUG_IDE_DISKS; 525 } 526 if (xen_disable_pv_nics == 0) { 527 if (bootverbose) 528 printf("XEN: disabling emulated nics\n"); 529 disable_devs |= XMI_UNPLUG_NICS; 530 } 531 532 if (disable_devs != 0) 533 outw(XEN_MAGIC_IOPORT, disable_devs); 534 } 535 536 static void 537 xen_hvm_init(enum xen_hvm_init_type init_type) 538 { 539 int error; 540 int i; 541 542 if (init_type == XEN_HVM_INIT_CANCELLED_SUSPEND) 543 return; 544 545 error = xen_hvm_init_hypercall_stubs(); 546 547 switch (init_type) { 548 case XEN_HVM_INIT_COLD: 549 if (error != 0) 550 return; 551 552 setup_xen_features(); 553 #ifdef SMP 554 cpu_ops = xen_hvm_cpu_ops; 555 #endif 556 vm_guest = VM_GUEST_XEN; 557 break; 558 case XEN_HVM_INIT_RESUME: 559 if (error != 0) 560 panic("Unable to init Xen hypercall stubs on resume"); 561 562 /* Clear stale vcpu_info. */ 563 CPU_FOREACH(i) 564 DPCPU_ID_SET(i, vcpu_info, NULL); 565 break; 566 default: 567 panic("Unsupported HVM initialization type"); 568 } 569 570 xen_vector_callback_enabled = 0; 571 xen_domain_type = XEN_HVM_DOMAIN; 572 xen_hvm_init_shared_info_page(); 573 xen_hvm_set_callback(NULL); 574 xen_hvm_disable_emulated_devices(); 575 } 576 577 void 578 xen_hvm_suspend(void) 579 { 580 } 581 582 void 583 xen_hvm_resume(bool suspend_cancelled) 584 { 585 586 xen_hvm_init(suspend_cancelled ? 587 XEN_HVM_INIT_CANCELLED_SUSPEND : XEN_HVM_INIT_RESUME); 588 589 /* Register vcpu_info area for CPU#0. */ 590 xen_hvm_cpu_init(); 591 } 592 593 static void 594 xen_hvm_sysinit(void *arg __unused) 595 { 596 xen_hvm_init(XEN_HVM_INIT_COLD); 597 } 598 599 static void 600 xen_set_vcpu_id(void) 601 { 602 struct pcpu *pc; 603 int i; 604 605 /* Set vcpu_id to acpi_id */ 606 CPU_FOREACH(i) { 607 pc = pcpu_find(i); 608 pc->pc_vcpu_id = pc->pc_acpi_id; 609 if (bootverbose) 610 printf("XEN: CPU %u has VCPU ID %u\n", 611 i, pc->pc_vcpu_id); 612 } 613 } 614 615 static void 616 xen_hvm_cpu_init(void) 617 { 618 struct vcpu_register_vcpu_info info; 619 struct vcpu_info *vcpu_info; 620 int cpu, rc; 621 622 if (!xen_domain()) 623 return; 624 625 if (DPCPU_GET(vcpu_info) != NULL) { 626 /* 627 * vcpu_info is already set. We're resuming 628 * from a failed migration and our pre-suspend 629 * configuration is still valid. 630 */ 631 return; 632 } 633 634 vcpu_info = DPCPU_PTR(vcpu_local_info); 635 cpu = PCPU_GET(vcpu_id); 636 info.mfn = vtophys(vcpu_info) >> PAGE_SHIFT; 637 info.offset = vtophys(vcpu_info) - trunc_page(vtophys(vcpu_info)); 638 639 rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); 640 if (rc != 0) 641 DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]); 642 else 643 DPCPU_SET(vcpu_info, vcpu_info); 644 } 645 646 SYSINIT(xen_hvm_init, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, xen_hvm_sysinit, NULL); 647 #ifdef SMP 648 SYSINIT(xen_setup_cpus, SI_SUB_SMP, SI_ORDER_FIRST, xen_setup_cpus, NULL); 649 #endif 650 SYSINIT(xen_hvm_cpu_init, SI_SUB_INTR, SI_ORDER_FIRST, xen_hvm_cpu_init, NULL); 651 SYSINIT(xen_set_vcpu_id, SI_SUB_CPU, SI_ORDER_ANY, xen_set_vcpu_id, NULL);
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