hvm.c revision 303776
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: stable/10/sys/x86/xen/hvm.c 303776 2016-08-05 17:13:25Z 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 62static driver_filter_t xen_smp_rendezvous_action; 63static driver_filter_t xen_invltlb; 64static driver_filter_t xen_invlpg; 65static driver_filter_t xen_invlrng; 66static driver_filter_t xen_invlcache; 67#ifdef __i386__ 68static driver_filter_t xen_lazypmap; 69#endif 70static driver_filter_t xen_ipi_bitmap_handler; 71static driver_filter_t xen_cpustop_handler; 72static driver_filter_t xen_cpususpend_handler; 73static driver_filter_t xen_cpustophard_handler; 74static void xen_ipi_vectored(u_int vector, int dest); 75#endif 76static void xen_hvm_cpu_init(void); 77 78/*---------------------------- Extern Declarations ---------------------------*/ 79#ifdef __i386__ 80extern void pmap_lazyfix_action(void); 81#endif 82#ifdef __amd64__ 83extern int pmap_pcid_enabled; 84#endif 85 86/*---------------------------------- Macros ----------------------------------*/ 87#define IPI_TO_IDX(ipi) ((ipi) - APIC_IPI_INTS) 88 89/*-------------------------------- Local Types -------------------------------*/ 90enum xen_hvm_init_type { 91 XEN_HVM_INIT_COLD, 92 XEN_HVM_INIT_CANCELLED_SUSPEND, 93 XEN_HVM_INIT_RESUME 94}; 95 96struct xen_ipi_handler 97{ 98 driver_filter_t *filter; 99 const char *description; 100}; 101 102/*-------------------------------- Global Data -------------------------------*/ 103enum xen_domain_type xen_domain_type = XEN_NATIVE; 104 105#ifdef SMP 106struct 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 113static MALLOC_DEFINE(M_XENHVM, "xen_hvm", "Xen HVM PV Support"); 114 115#ifdef SMP 116static 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 */ 137int xen_vector_callback_enabled; 138 139/*------------------------------- Per-CPU Data -------------------------------*/ 140DPCPU_DEFINE(struct vcpu_info, vcpu_local_info); 141DPCPU_DEFINE(struct vcpu_info *, vcpu_info); 142#ifdef SMP 143DPCPU_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. */ 148char *hypercall_stubs; 149shared_info_t *HYPERVISOR_shared_info; 150 151 152/*------------------------------ Sysctl tunables -----------------------------*/ 153int xen_disable_pv_disks = 0; 154int xen_disable_pv_nics = 0; 155TUNABLE_INT("hw.xen.disable_pv_disks", &xen_disable_pv_disks); 156TUNABLE_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 */ 163static int 164xen_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 173static int 174xen_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 184static int 185xen_invltlb(void *arg) 186{ 187 188 invltlb_handler(); 189 return (FILTER_HANDLED); 190} 191 192#ifdef __amd64__ 193static int 194xen_invltlb_pcid(void *arg) 195{ 196 197 invltlb_pcid_handler(); 198 return (FILTER_HANDLED); 199} 200#endif 201 202static int 203xen_invlpg(void *arg) 204{ 205 206 invlpg_handler(); 207 return (FILTER_HANDLED); 208} 209 210#ifdef __amd64__ 211static int 212xen_invlpg_pcid(void *arg) 213{ 214 215 invlpg_pcid_handler(); 216 return (FILTER_HANDLED); 217} 218#endif 219 220static int 221xen_invlrng(void *arg) 222{ 223 224 invlrng_handler(); 225 return (FILTER_HANDLED); 226} 227 228static int 229xen_invlcache(void *arg) 230{ 231 232 invlcache_handler(); 233 return (FILTER_HANDLED); 234} 235 236#ifdef __i386__ 237static int 238xen_lazypmap(void *arg) 239{ 240 241 pmap_lazyfix_action(); 242 return (FILTER_HANDLED); 243} 244#endif 245 246static int 247xen_cpustop_handler(void *arg) 248{ 249 250 cpustop_handler(); 251 return (FILTER_HANDLED); 252} 253 254static int 255xen_cpususpend_handler(void *arg) 256{ 257 258 cpususpend_handler(); 259 return (FILTER_HANDLED); 260} 261 262static int 263xen_cpustophard_handler(void *arg) 264{ 265 266 ipi_nmi_handler(); 267 return (FILTER_HANDLED); 268} 269 270/* Xen PV IPI sender */ 271static void 272xen_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 -------------------------*/ 310static void 311xen_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 337static void 338xen_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 ----------------------*/ 360static uint32_t 361xen_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 */ 377static int 378xen_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 if (((major < 4) || (major == 4 && minor <= 5)) && 398 msix_disable_migration == -1) { 399 /* 400 * Xen hypervisors prior to 4.6.0 do not properly 401 * handle updates to enabled MSI-X table entries, 402 * so disable MSI-X interrupt migration in that 403 * case. 404 */ 405 if (bootverbose) 406 printf( 407"Disabling MSI-X interrupt migration due to Xen hypervisor bug.\n" 408"Set machdep.msix_disable_migration=0 to forcefully enable it.\n"); 409 msix_disable_migration = 1; 410 } 411 } 412 413 /* 414 * Find the hypercall pages. 415 */ 416 do_cpuid(base + 2, regs); 417 418 if (hypercall_stubs == NULL) { 419 size_t call_region_size; 420 421 call_region_size = regs[0] * PAGE_SIZE; 422 hypercall_stubs = malloc(call_region_size, M_XENHVM, M_NOWAIT); 423 if (hypercall_stubs == NULL) 424 panic("Unable to allocate Xen hypercall region"); 425 } 426 427 for (i = 0; i < regs[0]; i++) 428 wrmsr(regs[1], vtophys(hypercall_stubs + i * PAGE_SIZE) + i); 429 430 return (0); 431} 432 433static void 434xen_hvm_init_shared_info_page(void) 435{ 436 struct xen_add_to_physmap xatp; 437 438 if (HYPERVISOR_shared_info == NULL) { 439 HYPERVISOR_shared_info = malloc(PAGE_SIZE, M_XENHVM, M_NOWAIT); 440 if (HYPERVISOR_shared_info == NULL) 441 panic("Unable to allocate Xen shared info page"); 442 } 443 444 xatp.domid = DOMID_SELF; 445 xatp.idx = 0; 446 xatp.space = XENMAPSPACE_shared_info; 447 xatp.gpfn = vtophys(HYPERVISOR_shared_info) >> PAGE_SHIFT; 448 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) 449 panic("HYPERVISOR_memory_op failed"); 450} 451 452/* 453 * Tell the hypervisor how to contact us for event channel callbacks. 454 */ 455void 456xen_hvm_set_callback(device_t dev) 457{ 458 struct xen_hvm_param xhp; 459 int irq; 460 461 if (xen_vector_callback_enabled) 462 return; 463 464 xhp.domid = DOMID_SELF; 465 xhp.index = HVM_PARAM_CALLBACK_IRQ; 466 if (xen_feature(XENFEAT_hvm_callback_vector) != 0) { 467 int error; 468 469 xhp.value = HVM_CALLBACK_VECTOR(IDT_EVTCHN); 470 error = HYPERVISOR_hvm_op(HVMOP_set_param, &xhp); 471 if (error == 0) { 472 xen_vector_callback_enabled = 1; 473 return; 474 } 475 printf("Xen HVM callback vector registration failed (%d). " 476 "Falling back to emulated device interrupt\n", error); 477 } 478 xen_vector_callback_enabled = 0; 479 if (dev == NULL) { 480 /* 481 * Called from early boot or resume. 482 * xenpci will invoke us again later. 483 */ 484 return; 485 } 486 487 irq = pci_get_irq(dev); 488 if (irq < 16) { 489 xhp.value = HVM_CALLBACK_GSI(irq); 490 } else { 491 u_int slot; 492 u_int pin; 493 494 slot = pci_get_slot(dev); 495 pin = pci_get_intpin(dev) - 1; 496 xhp.value = HVM_CALLBACK_PCI_INTX(slot, pin); 497 } 498 499 if (HYPERVISOR_hvm_op(HVMOP_set_param, &xhp) != 0) 500 panic("Can't set evtchn callback"); 501} 502 503#define XEN_MAGIC_IOPORT 0x10 504enum { 505 XMI_MAGIC = 0x49d2, 506 XMI_UNPLUG_IDE_DISKS = 0x01, 507 XMI_UNPLUG_NICS = 0x02, 508 XMI_UNPLUG_IDE_EXCEPT_PRI_MASTER = 0x04 509}; 510 511static void 512xen_hvm_disable_emulated_devices(void) 513{ 514 u_short disable_devs = 0; 515 516 if (inw(XEN_MAGIC_IOPORT) != XMI_MAGIC) 517 return; 518 519 if (xen_disable_pv_disks == 0) { 520 if (bootverbose) 521 printf("XEN: disabling emulated disks\n"); 522 disable_devs |= XMI_UNPLUG_IDE_DISKS; 523 } 524 if (xen_disable_pv_nics == 0) { 525 if (bootverbose) 526 printf("XEN: disabling emulated nics\n"); 527 disable_devs |= XMI_UNPLUG_NICS; 528 } 529 530 if (disable_devs != 0) 531 outw(XEN_MAGIC_IOPORT, disable_devs); 532} 533 534static void 535xen_hvm_init(enum xen_hvm_init_type init_type) 536{ 537 int error; 538 int i; 539 540 if (init_type == XEN_HVM_INIT_CANCELLED_SUSPEND) 541 return; 542 543 error = xen_hvm_init_hypercall_stubs(); 544 545 switch (init_type) { 546 case XEN_HVM_INIT_COLD: 547 if (error != 0) 548 return; 549 550 setup_xen_features(); 551#ifdef SMP 552 cpu_ops = xen_hvm_cpu_ops; 553#endif 554 vm_guest = VM_GUEST_XEN; 555 break; 556 case XEN_HVM_INIT_RESUME: 557 if (error != 0) 558 panic("Unable to init Xen hypercall stubs on resume"); 559 560 /* Clear stale vcpu_info. */ 561 CPU_FOREACH(i) 562 DPCPU_ID_SET(i, vcpu_info, NULL); 563 break; 564 default: 565 panic("Unsupported HVM initialization type"); 566 } 567 568 xen_vector_callback_enabled = 0; 569 xen_domain_type = XEN_HVM_DOMAIN; 570 xen_hvm_init_shared_info_page(); 571 xen_hvm_set_callback(NULL); 572 xen_hvm_disable_emulated_devices(); 573} 574 575void 576xen_hvm_suspend(void) 577{ 578} 579 580void 581xen_hvm_resume(bool suspend_cancelled) 582{ 583 584 xen_hvm_init(suspend_cancelled ? 585 XEN_HVM_INIT_CANCELLED_SUSPEND : XEN_HVM_INIT_RESUME); 586 587 /* Register vcpu_info area for CPU#0. */ 588 xen_hvm_cpu_init(); 589} 590 591static void 592xen_hvm_sysinit(void *arg __unused) 593{ 594 xen_hvm_init(XEN_HVM_INIT_COLD); 595} 596 597static void 598xen_set_vcpu_id(void) 599{ 600 struct pcpu *pc; 601 int i; 602 603 /* Set vcpu_id to acpi_id */ 604 CPU_FOREACH(i) { 605 pc = pcpu_find(i); 606 pc->pc_vcpu_id = pc->pc_acpi_id; 607 if (bootverbose) 608 printf("XEN: CPU %u has VCPU ID %u\n", 609 i, pc->pc_vcpu_id); 610 } 611} 612 613static void 614xen_hvm_cpu_init(void) 615{ 616 struct vcpu_register_vcpu_info info; 617 struct vcpu_info *vcpu_info; 618 int cpu, rc; 619 620 if (!xen_domain()) 621 return; 622 623 if (DPCPU_GET(vcpu_info) != NULL) { 624 /* 625 * vcpu_info is already set. We're resuming 626 * from a failed migration and our pre-suspend 627 * configuration is still valid. 628 */ 629 return; 630 } 631 632 vcpu_info = DPCPU_PTR(vcpu_local_info); 633 cpu = PCPU_GET(vcpu_id); 634 info.mfn = vtophys(vcpu_info) >> PAGE_SHIFT; 635 info.offset = vtophys(vcpu_info) - trunc_page(vtophys(vcpu_info)); 636 637 rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); 638 if (rc != 0) 639 DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]); 640 else 641 DPCPU_SET(vcpu_info, vcpu_info); 642} 643 644SYSINIT(xen_hvm_init, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, xen_hvm_sysinit, NULL); 645#ifdef SMP 646SYSINIT(xen_setup_cpus, SI_SUB_SMP, SI_ORDER_FIRST, xen_setup_cpus, NULL); 647#endif 648SYSINIT(xen_hvm_cpu_init, SI_SUB_INTR, SI_ORDER_FIRST, xen_hvm_cpu_init, NULL); 649SYSINIT(xen_set_vcpu_id, SI_SUB_CPU, SI_ORDER_ANY, xen_set_vcpu_id, NULL); 650