qemu_migration.c 111.9 KB
Newer Older
1 2 3
/*
 * qemu_migration.c: QEMU migration handling
 *
M
Martin Kletzander 已提交
4
 * Copyright (C) 2006-2012 Red Hat, Inc.
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *
 */

#include <config.h>

#include <sys/time.h>
25 26
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
27
#include <fcntl.h>
28
#include <poll.h>
29 30 31 32 33 34

#include "qemu_migration.h"
#include "qemu_monitor.h"
#include "qemu_domain.h"
#include "qemu_process.h"
#include "qemu_capabilities.h"
35
#include "qemu_cgroup.h"
36

37
#include "domain_audit.h"
38 39 40 41
#include "logging.h"
#include "virterror_internal.h"
#include "memory.h"
#include "util.h"
E
Eric Blake 已提交
42
#include "virfile.h"
43 44
#include "datatypes.h"
#include "fdstream.h"
45
#include "uuid.h"
46
#include "virtime.h"
47
#include "locking/domain_lock.h"
48
#include "rpc/virnetsocket.h"
49
#include "storage_file.h"
M
Martin Kletzander 已提交
50
#include "viruri.h"
J
Jiri Denemark 已提交
51
#include "hooks.h"
52

53 54 55

#define VIR_FROM_THIS VIR_FROM_QEMU

56 57 58 59 60 61 62 63 64 65 66 67 68
VIR_ENUM_IMPL(qemuMigrationJobPhase, QEMU_MIGRATION_PHASE_LAST,
              "none",
              "perform2",
              "begin3",
              "perform3",
              "perform3_done",
              "confirm3_cancelled",
              "confirm3",
              "prepare",
              "finish2",
              "finish3",
);

69
enum qemuMigrationCookieFlags {
70
    QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS,
71
    QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE,
72
    QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT,
73 74 75 76 77 78 79

    QEMU_MIGRATION_COOKIE_FLAG_LAST
};

VIR_ENUM_DECL(qemuMigrationCookieFlag);
VIR_ENUM_IMPL(qemuMigrationCookieFlag,
              QEMU_MIGRATION_COOKIE_FLAG_LAST,
80
              "graphics", "lockstate", "persistent");
81 82 83

enum qemuMigrationCookieFeatures {
    QEMU_MIGRATION_COOKIE_GRAPHICS  = (1 << QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS),
84
    QEMU_MIGRATION_COOKIE_LOCKSTATE = (1 << QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE),
85
    QEMU_MIGRATION_COOKIE_PERSISTENT = (1 << QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT),
86 87 88 89 90 91 92 93 94 95 96 97
};

typedef struct _qemuMigrationCookieGraphics qemuMigrationCookieGraphics;
typedef qemuMigrationCookieGraphics *qemuMigrationCookieGraphicsPtr;
struct _qemuMigrationCookieGraphics {
    int type;
    int port;
    int tlsPort;
    char *listen;
    char *tlsSubject;
};

98 99 100
typedef struct _qemuMigrationCookie qemuMigrationCookie;
typedef qemuMigrationCookie *qemuMigrationCookiePtr;
struct _qemuMigrationCookie {
E
Eric Blake 已提交
101 102
    unsigned int flags;
    unsigned int flagsMandatory;
103 104

    /* Host properties */
105 106 107 108
    unsigned char localHostuuid[VIR_UUID_BUFLEN];
    unsigned char remoteHostuuid[VIR_UUID_BUFLEN];
    char *localHostname;
    char *remoteHostname;
109 110 111 112

    /* Guest properties */
    unsigned char uuid[VIR_UUID_BUFLEN];
    char *name;
113

114 115 116 117
    /* If (flags & QEMU_MIGRATION_COOKIE_LOCKSTATE) */
    char *lockState;
    char *lockDriver;

118 119
    /* If (flags & QEMU_MIGRATION_COOKIE_GRAPHICS) */
    qemuMigrationCookieGraphicsPtr graphics;
120 121 122

    /* If (flags & QEMU_MIGRATION_COOKIE_PERSISTENT) */
    virDomainDefPtr persistent;
123 124
};

125 126 127 128 129 130 131 132 133
static void qemuMigrationCookieGraphicsFree(qemuMigrationCookieGraphicsPtr grap)
{
    if (!grap)
        return;
    VIR_FREE(grap->listen);
    VIR_FREE(grap->tlsSubject);
    VIR_FREE(grap);
}

134 135 136 137 138 139

static void qemuMigrationCookieFree(qemuMigrationCookiePtr mig)
{
    if (!mig)
        return;

140 141 142
    if (mig->flags & QEMU_MIGRATION_COOKIE_GRAPHICS)
        qemuMigrationCookieGraphicsFree(mig->graphics);

143 144
    VIR_FREE(mig->localHostname);
    VIR_FREE(mig->remoteHostname);
145
    VIR_FREE(mig->name);
146 147
    VIR_FREE(mig->lockState);
    VIR_FREE(mig->lockDriver);
148 149 150 151
    VIR_FREE(mig);
}


152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224
static char *
qemuDomainExtractTLSSubject(const char *certdir)
{
    char *certfile = NULL;
    char *subject = NULL;
    char *pemdata = NULL;
    gnutls_datum_t pemdatum;
    gnutls_x509_crt_t cert;
    int ret;
    size_t subjectlen;

    if (virAsprintf(&certfile, "%s/server-cert.pem", certdir) < 0)
        goto no_memory;

    if (virFileReadAll(certfile, 8192, &pemdata) < 0) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("unable to read server cert %s"), certfile);
        goto error;
    }

    ret = gnutls_x509_crt_init(&cert);
    if (ret < 0) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("cannot initialize cert object: %s"),
                        gnutls_strerror(ret));
        goto error;
    }

    pemdatum.data = (unsigned char *)pemdata;
    pemdatum.size = strlen(pemdata);

    ret = gnutls_x509_crt_import(cert, &pemdatum, GNUTLS_X509_FMT_PEM);
    if (ret < 0) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("cannot load cert data from %s: %s"),
                        certfile, gnutls_strerror(ret));
        goto error;
    }

    subjectlen = 1024;
    if (VIR_ALLOC_N(subject, subjectlen+1) < 0)
        goto no_memory;

    gnutls_x509_crt_get_dn(cert, subject, &subjectlen);
    subject[subjectlen] = '\0';

    VIR_FREE(certfile);
    VIR_FREE(pemdata);

    return subject;

no_memory:
    virReportOOMError();
error:
    VIR_FREE(certfile);
    VIR_FREE(pemdata);
    return NULL;
}


static qemuMigrationCookieGraphicsPtr
qemuMigrationCookieGraphicsAlloc(struct qemud_driver *driver,
                                 virDomainGraphicsDefPtr def)
{
    qemuMigrationCookieGraphicsPtr mig = NULL;
    const char *listenAddr;

    if (VIR_ALLOC(mig) < 0)
        goto no_memory;

    mig->type = def->type;
    if (mig->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC) {
        mig->port = def->data.vnc.port;
225
        listenAddr = virDomainGraphicsListenGetAddress(def, 0);
226 227 228 229 230 231 232 233 234 235 236 237
        if (!listenAddr)
            listenAddr = driver->vncListen;

        if (driver->vncTLS &&
            !(mig->tlsSubject = qemuDomainExtractTLSSubject(driver->vncTLSx509certdir)))
            goto error;
    } else {
        mig->port = def->data.spice.port;
        if (driver->spiceTLS)
            mig->tlsPort = def->data.spice.tlsPort;
        else
            mig->tlsPort = -1;
238
        listenAddr = virDomainGraphicsListenGetAddress(def, 0);
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258
        if (!listenAddr)
            listenAddr = driver->spiceListen;

        if (driver->spiceTLS &&
            !(mig->tlsSubject = qemuDomainExtractTLSSubject(driver->spiceTLSx509certdir)))
            goto error;
    }
    if (!(mig->listen = strdup(listenAddr)))
        goto no_memory;

    return mig;

no_memory:
    virReportOOMError();
error:
    qemuMigrationCookieGraphicsFree(mig);
    return NULL;
}


259 260 261
static qemuMigrationCookiePtr
qemuMigrationCookieNew(virDomainObjPtr dom)
{
J
Jiri Denemark 已提交
262
    qemuDomainObjPrivatePtr priv = dom->privateData;
263
    qemuMigrationCookiePtr mig = NULL;
J
Jiri Denemark 已提交
264
    const char *name;
265 266 267 268

    if (VIR_ALLOC(mig) < 0)
        goto no_memory;

J
Jiri Denemark 已提交
269 270 271 272 273
    if (priv->origname)
        name = priv->origname;
    else
        name = dom->def->name;
    if (!(mig->name = strdup(name)))
274 275 276
        goto no_memory;
    memcpy(mig->uuid, dom->def->uuid, VIR_UUID_BUFLEN);

277
    if (!(mig->localHostname = virGetHostname(NULL)))
278
        goto error;
279
    if (virGetHostUUID(mig->localHostuuid) < 0) {
280 281 282 283 284 285 286 287 288 289 290 291 292 293 294
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("Unable to obtain host UUID"));
        goto error;
    }

    return mig;

no_memory:
    virReportOOMError();
error:
    qemuMigrationCookieFree(mig);
    return NULL;
}


295 296 297 298 299 300 301 302 303 304 305 306 307
static int
qemuMigrationCookieAddGraphics(qemuMigrationCookiePtr mig,
                               struct qemud_driver *driver,
                               virDomainObjPtr dom)
{
    if (mig->flags & QEMU_MIGRATION_COOKIE_GRAPHICS) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("Migration graphics data already present"));
        return -1;
    }

    if (dom->def->ngraphics == 1 &&
        (dom->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC ||
308 309 310 311 312 313
         dom->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE)) {
        if (!(mig->graphics =
              qemuMigrationCookieGraphicsAlloc(driver, dom->def->graphics[0])))
            return -1;
        mig->flags |= QEMU_MIGRATION_COOKIE_GRAPHICS;
    }
314 315 316 317 318

    return 0;
}


319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352
static int
qemuMigrationCookieAddLockstate(qemuMigrationCookiePtr mig,
                                struct qemud_driver *driver,
                                virDomainObjPtr dom)
{
    qemuDomainObjPrivatePtr priv = dom->privateData;

    if (mig->flags & QEMU_MIGRATION_COOKIE_LOCKSTATE) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("Migration lockstate data already present"));
        return -1;
    }

    if (virDomainObjGetState(dom, NULL) == VIR_DOMAIN_PAUSED) {
        if (priv->lockState &&
            !(mig->lockState = strdup(priv->lockState)))
            return -1;
    } else {
        if (virDomainLockProcessInquire(driver->lockManager, dom, &mig->lockState) < 0)
            return -1;
    }

    if (!(mig->lockDriver = strdup(virLockManagerPluginGetName(driver->lockManager)))) {
        VIR_FREE(mig->lockState);
        return -1;
    }

    mig->flags |= QEMU_MIGRATION_COOKIE_LOCKSTATE;
    mig->flagsMandatory |= QEMU_MIGRATION_COOKIE_LOCKSTATE;

    return 0;
}


353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372
static int
qemuMigrationCookieAddPersistent(qemuMigrationCookiePtr mig,
                                 virDomainObjPtr dom)
{
    if (mig->flags & QEMU_MIGRATION_COOKIE_PERSISTENT) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("Migration persistent data already present"));
        return -1;
    }

    if (!dom->newDef)
        return 0;

    mig->persistent = dom->newDef;
    mig->flags |= QEMU_MIGRATION_COOKIE_PERSISTENT;
    mig->flagsMandatory |= QEMU_MIGRATION_COOKIE_PERSISTENT;
    return 0;
}


373

374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391
static void qemuMigrationCookieGraphicsXMLFormat(virBufferPtr buf,
                                                 qemuMigrationCookieGraphicsPtr grap)
{
    virBufferAsprintf(buf, "  <graphics type='%s' port='%d' listen='%s'",
                      virDomainGraphicsTypeToString(grap->type),
                      grap->port, grap->listen);
    if (grap->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE)
        virBufferAsprintf(buf, " tlsPort='%d'", grap->tlsPort);
    if (grap->tlsSubject) {
        virBufferAddLit(buf, ">\n");
        virBufferEscapeString(buf, "    <cert info='subject' value='%s'/>\n", grap->tlsSubject);
        virBufferAddLit(buf, "  </graphics>\n");
    } else {
        virBufferAddLit(buf, "/>\n");
    }
}


392
static int
393 394
qemuMigrationCookieXMLFormat(struct qemud_driver *driver,
                             virBufferPtr buf,
395
                             qemuMigrationCookiePtr mig)
396 397 398
{
    char uuidstr[VIR_UUID_STRING_BUFLEN];
    char hostuuidstr[VIR_UUID_STRING_BUFLEN];
399
    int i;
400 401

    virUUIDFormat(mig->uuid, uuidstr);
402
    virUUIDFormat(mig->localHostuuid, hostuuidstr);
403 404 405 406

    virBufferAsprintf(buf, "<qemu-migration>\n");
    virBufferEscapeString(buf, "  <name>%s</name>\n", mig->name);
    virBufferAsprintf(buf, "  <uuid>%s</uuid>\n", uuidstr);
407
    virBufferEscapeString(buf, "  <hostname>%s</hostname>\n", mig->localHostname);
408
    virBufferAsprintf(buf, "  <hostuuid>%s</hostuuid>\n", hostuuidstr);
409

410 411 412 413 414 415
    for (i = 0 ; i < QEMU_MIGRATION_COOKIE_FLAG_LAST ; i++) {
        if (mig->flagsMandatory & (1 << i))
            virBufferAsprintf(buf, "  <feature name='%s'/>\n",
                              qemuMigrationCookieFlagTypeToString(i));
    }

416 417
    if ((mig->flags & QEMU_MIGRATION_COOKIE_GRAPHICS) &&
        mig->graphics)
418 419
        qemuMigrationCookieGraphicsXMLFormat(buf, mig->graphics);

420 421 422 423 424 425 426 427 428
    if ((mig->flags & QEMU_MIGRATION_COOKIE_LOCKSTATE) &&
        mig->lockState) {
        virBufferAsprintf(buf, "  <lockstate driver='%s'>\n",
                          mig->lockDriver);
        virBufferAsprintf(buf, "    <leases>%s</leases>\n",
                          mig->lockState);
        virBufferAddLit(buf, "  </lockstate>\n");
    }

429 430
    if ((mig->flags & QEMU_MIGRATION_COOKIE_PERSISTENT) &&
        mig->persistent) {
431
        virBufferAdjustIndent(buf, 2);
432 433 434 435
        if (qemuDomainDefFormatBuf(driver,
                                   mig->persistent,
                                   VIR_DOMAIN_XML_INACTIVE |
                                   VIR_DOMAIN_XML_SECURE,
436
                                   true,
437
                                   buf) < 0)
438 439
            return -1;
        virBufferAdjustIndent(buf, -2);
440 441
    }

442
    virBufferAddLit(buf, "</qemu-migration>\n");
443
    return 0;
444 445 446
}


447 448
static char *qemuMigrationCookieXMLFormatStr(struct qemud_driver *driver,
                                             qemuMigrationCookiePtr mig)
449 450 451
{
    virBuffer buf = VIR_BUFFER_INITIALIZER;

452
    if (qemuMigrationCookieXMLFormat(driver, &buf, mig) < 0) {
453 454 455
        virBufferFreeAndReset(&buf);
        return NULL;
    }
456 457 458

    if (virBufferError(&buf)) {
        virReportOOMError();
459
        virBufferFreeAndReset(&buf);
460 461 462 463 464 465 466
        return NULL;
    }

    return virBufferContentAndReset(&buf);
}


467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486
static qemuMigrationCookieGraphicsPtr
qemuMigrationCookieGraphicsXMLParse(xmlXPathContextPtr ctxt)
{
    qemuMigrationCookieGraphicsPtr grap;
    char *tmp;

    if (VIR_ALLOC(grap) < 0)
        goto no_memory;

    if (!(tmp = virXPathString("string(./graphics/@type)", ctxt))) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("missing type attribute in migration data"));
        goto error;
    }
    if ((grap->type = virDomainGraphicsTypeFromString(tmp)) < 0) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("unknown graphics type %s"), tmp);
        VIR_FREE(tmp);
        goto error;
    }
E
Eric Blake 已提交
487
    VIR_FREE(tmp);
488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505
    if (virXPathInt("string(./graphics/@port)", ctxt, &grap->port) < 0) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("missing port attribute in migration data"));
        goto error;
    }
    if (grap->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
        if (virXPathInt("string(./graphics/@tlsPort)", ctxt, &grap->tlsPort) < 0) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR,
                            "%s", _("missing tlsPort attribute in migration data"));
            goto error;
        }
    }
    if (!(grap->listen = virXPathString("string(./graphics/@listen)", ctxt))) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("missing listen attribute in migration data"));
        goto error;
    }
    /* Optional */
506
    grap->tlsSubject = virXPathString("string(./graphics/cert[@info='subject']/@value)", ctxt);
507 508 509 510 511 512 513 514 515 516 517 518


    return grap;

no_memory:
    virReportOOMError();
error:
    qemuMigrationCookieGraphicsFree(grap);
    return NULL;
}


519 520
static int
qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
521 522
                            struct qemud_driver *driver,
                            xmlDocPtr doc,
523
                            xmlXPathContextPtr ctxt,
E
Eric Blake 已提交
524
                            unsigned int flags)
525 526 527
{
    char uuidstr[VIR_UUID_STRING_BUFLEN];
    char *tmp;
528 529
    xmlNodePtr *nodes = NULL;
    int i, n;
530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565

    /* We don't store the uuid, name, hostname, or hostuuid
     * values. We just compare them to local data to do some
     * sanity checking on migration operation
     */

    /* Extract domain name */
    if (!(tmp = virXPathString("string(./name[1])", ctxt))) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("missing name element in migration data"));
        goto error;
    }
    if (STRNEQ(tmp, mig->name)) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Incoming cookie data had unexpected name %s vs %s"),
                        tmp, mig->name);
        goto error;
    }
    VIR_FREE(tmp);

    /* Extract domain uuid */
    tmp = virXPathString("string(./uuid[1])", ctxt);
    if (!tmp) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("missing uuid element in migration data"));
        goto error;
    }
    virUUIDFormat(mig->uuid, uuidstr);
    if (STRNEQ(tmp, uuidstr)) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Incoming cookie data had unexpected UUID %s vs %s"),
                        tmp, uuidstr);
    }
    VIR_FREE(tmp);

    /* Check & forbid "localhost" migration */
566
    if (!(mig->remoteHostname = virXPathString("string(./hostname[1])", ctxt))) {
567 568 569 570
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("missing hostname element in migration data"));
        goto error;
    }
571
    if (STREQ(mig->remoteHostname, mig->localHostname)) {
572 573
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Attempt to migrate guest to the same host %s"),
574
                        mig->remoteHostname);
575 576 577 578 579 580 581 582
        goto error;
    }

    if (!(tmp = virXPathString("string(./hostuuid[1])", ctxt))) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("missing hostuuid element in migration data"));
        goto error;
    }
583 584 585 586 587 588
    if (virUUIDParse(tmp, mig->remoteHostuuid) < 0) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("malformed hostuuid element in migration data"));
        goto error;
    }
    if (memcmp(mig->remoteHostuuid, mig->localHostuuid, VIR_UUID_BUFLEN) == 0) {
589 590 591 592 593 594 595
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Attempt to migrate guest to the same host %s"),
                        tmp);
        goto error;
    }
    VIR_FREE(tmp);

596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627
    /* Check to ensure all mandatory features from XML are also
     * present in 'flags' */
    if ((n = virXPathNodeSet("./features", ctxt, &nodes)) < 0)
        goto error;

    for (i = 0 ; i < n ; i++) {
        int val;
        char *str = virXMLPropString(nodes[i], "name");
        if (!str) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR,
                            "%s", _("missing feature name"));
            goto error;
        }

        if ((val = qemuMigrationCookieFlagTypeFromString(str)) < 0) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR,
                            _("Unknown migration cookie feature %s"),
                            str);
            VIR_FREE(str);
            goto error;
        }

        if ((flags & (1 << val)) == 0) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR,
                            _("Unsupported migration cookie feature %s"),
                            str);
            VIR_FREE(str);
        }
        VIR_FREE(str);
    }
    VIR_FREE(nodes);

628 629 630 631 632
    if ((flags & QEMU_MIGRATION_COOKIE_GRAPHICS) &&
        virXPathBoolean("count(./graphics) > 0", ctxt) &&
        (!(mig->graphics = qemuMigrationCookieGraphicsXMLParse(ctxt))))
        goto error;

633 634 635 636 637 638 639 640 641 642 643 644 645
    if ((flags & QEMU_MIGRATION_COOKIE_LOCKSTATE) &&
        virXPathBoolean("count(./lockstate) > 0", ctxt)) {
        mig->lockDriver = virXPathString("string(./lockstate[1]/@driver)", ctxt);
        if (!mig->lockDriver) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                            _("Missing lock driver name in migration cookie"));
            goto error;
        }
        mig->lockState = virXPathString("string(./lockstate[1]/leases[1])", ctxt);
        if (mig->lockState && STREQ(mig->lockState, ""))
            VIR_FREE(mig->lockState);
    }

646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
    if ((flags & QEMU_MIGRATION_COOKIE_PERSISTENT) &&
        virXPathBoolean("count(./domain) > 0", ctxt)) {
        if ((n = virXPathNodeSet("./domain", ctxt, &nodes)) > 1) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR,
                            _("Too many domain elements in "
                              "migration cookie: %d"),
                            n);
            goto error;
        }
        mig->persistent = virDomainDefParseNode(driver->caps, doc, nodes[0],
                                                -1, VIR_DOMAIN_XML_INACTIVE);
        if (!mig->persistent) {
            /* virDomainDefParseNode already reported
             * an error for us */
            goto error;
        }
        VIR_FREE(nodes);
    }

665 666 667 668
    return 0;

error:
    VIR_FREE(tmp);
669
    VIR_FREE(nodes);
670 671 672 673 674 675
    return -1;
}


static int
qemuMigrationCookieXMLParseStr(qemuMigrationCookiePtr mig,
676
                               struct qemud_driver *driver,
677
                               const char *xml,
E
Eric Blake 已提交
678
                               unsigned int flags)
679 680 681
{
    xmlDocPtr doc = NULL;
    xmlXPathContextPtr ctxt = NULL;
682
    int ret = -1;
683 684 685

    VIR_DEBUG("xml=%s", NULLSTR(xml));

686
    if (!(doc = virXMLParseStringCtxt(xml, _("(qemu_migration_cookie)"), &ctxt)))
687 688
        goto cleanup;

689
    ret = qemuMigrationCookieXMLParse(mig, driver, doc, ctxt, flags);
690 691 692 693 694 695 696 697 698 699 700

cleanup:
    xmlXPathFreeContext(ctxt);
    xmlFreeDoc(doc);

    return ret;
}


static int
qemuMigrationBakeCookie(qemuMigrationCookiePtr mig,
701 702
                        struct qemud_driver *driver,
                        virDomainObjPtr dom,
703 704
                        char **cookieout,
                        int *cookieoutlen,
E
Eric Blake 已提交
705
                        unsigned int flags)
706
{
707 708
    if (!cookieout || !cookieoutlen)
        return 0;
709 710 711

    *cookieoutlen = 0;

712 713 714 715
    if (flags & QEMU_MIGRATION_COOKIE_GRAPHICS &&
        qemuMigrationCookieAddGraphics(mig, driver, dom) < 0)
        return -1;

716 717 718 719
    if (flags & QEMU_MIGRATION_COOKIE_LOCKSTATE &&
        qemuMigrationCookieAddLockstate(mig, driver, dom) < 0)
        return -1;

720 721 722 723
    if (flags & QEMU_MIGRATION_COOKIE_PERSISTENT &&
        qemuMigrationCookieAddPersistent(mig, dom) < 0)
        return -1;

724
    if (!(*cookieout = qemuMigrationCookieXMLFormatStr(driver, mig)))
725 726 727 728 729 730 731 732 733 734 735
        return -1;

    *cookieoutlen = strlen(*cookieout) + 1;

    VIR_DEBUG("cookielen=%d cookie=%s", *cookieoutlen, *cookieout);

    return 0;
}


static qemuMigrationCookiePtr
736 737
qemuMigrationEatCookie(struct qemud_driver *driver,
                       virDomainObjPtr dom,
738 739
                       const char *cookiein,
                       int cookieinlen,
E
Eric Blake 已提交
740
                       unsigned int flags)
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758
{
    qemuMigrationCookiePtr mig = NULL;

    /* Parse & validate incoming cookie (if any) */
    if (cookiein && cookieinlen &&
        cookiein[cookieinlen-1] != '\0') {
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("Migration cookie was not NULL terminated"));
        goto error;
    }

    VIR_DEBUG("cookielen=%d cookie='%s'", cookieinlen, NULLSTR(cookiein));

    if (!(mig = qemuMigrationCookieNew(dom)))
        return NULL;

    if (cookiein && cookieinlen &&
        qemuMigrationCookieXMLParseStr(mig,
759
                                       driver,
760 761 762 763
                                       cookiein,
                                       flags) < 0)
        goto error;

764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
    if (mig->flags & QEMU_MIGRATION_COOKIE_LOCKSTATE) {
        if (!mig->lockDriver) {
            if (virLockManagerPluginUsesState(driver->lockManager)) {
                qemuReportError(VIR_ERR_INTERNAL_ERROR,
                                _("Missing %s lock state for migration cookie"),
                                virLockManagerPluginGetName(driver->lockManager));
                goto error;
            }
        } else if (STRNEQ(mig->lockDriver,
                          virLockManagerPluginGetName(driver->lockManager))) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR,
                            _("Source host lock driver %s different from target %s"),
                            mig->lockDriver,
                            virLockManagerPluginGetName(driver->lockManager));
            goto error;
        }
    }

782 783 784 785 786 787
    return mig;

error:
    qemuMigrationCookieFree(mig);
    return NULL;
}
788

789 790 791 792 793 794 795 796 797 798 799 800
/* Validate whether the domain is safe to migrate.  If vm is NULL,
 * then this is being run in the v2 Prepare stage on the destination
 * (where we only have the target xml); if vm is provided, then this
 * is being run in either v2 Perform or v3 Begin (where we also have
 * access to all of the domain's metadata, such as whether it is
 * marked autodestroy or has snapshots).  While it would be nice to
 * assume that checking on source is sufficient to prevent ever
 * talking to the destination in the first place, we are stuck with
 * the fact that older servers did not do checks on the source. */
static bool
qemuMigrationIsAllowed(struct qemud_driver *driver, virDomainObjPtr vm,
                       virDomainDefPtr def)
801
{
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818
    int nsnapshots;

    if (vm) {
        if (qemuProcessAutoDestroyActive(driver, vm)) {
            qemuReportError(VIR_ERR_OPERATION_INVALID,
                            "%s", _("domain is marked for auto destroy"));
            return false;
        }
        if ((nsnapshots = virDomainSnapshotObjListNum(&vm->snapshots, 0))) {
            qemuReportError(VIR_ERR_OPERATION_INVALID,
                            _("cannot migrate domain with %d snapshots"),
                            nsnapshots);
            return false;
        }

        def = vm->def;
    }
819 820 821 822 823 824 825 826 827
    if (def->nhostdevs > 0) {
        qemuReportError(VIR_ERR_OPERATION_INVALID,
            "%s", _("Domain with assigned host devices cannot be migrated"));
        return false;
    }

    return true;
}

828 829 830 831 832 833 834 835
static bool
qemuMigrationIsSafe(virDomainDefPtr def)
{
    int i;

    for (i = 0 ; i < def->ndisks ; i++) {
        virDomainDiskDefPtr disk = def->disks[i];

836 837
        /* Our code elsewhere guarantees shared disks are either readonly (in
         * which case cache mode doesn't matter) or used with cache=none */
838
        if (disk->src &&
839 840 841
            !disk->shared &&
            !disk->readonly &&
            disk->cachemode != VIR_DOMAIN_DISK_CACHE_DISABLE) {
842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
            int cfs;
            if ((cfs = virStorageFileIsClusterFS(disk->src)) == 1)
                continue;
            else if (cfs < 0)
                return false;

            qemuReportError(VIR_ERR_MIGRATE_UNSAFE, "%s",
                            _("Migration may lead to data corruption if disks"
                              " use cache != none"));
            return false;
        }
    }

    return true;
}

858 859 860 861 862 863 864 865
/** qemuMigrationSetOffline
 * Pause domain for non-live migration.
 */
int
qemuMigrationSetOffline(struct qemud_driver *driver,
                        virDomainObjPtr vm)
{
    int ret;
866
    VIR_DEBUG("driver=%p vm=%p", driver, vm);
867 868
    ret = qemuProcessStopCPUs(driver, vm, VIR_DOMAIN_PAUSED_MIGRATION,
                              QEMU_ASYNC_JOB_MIGRATION_OUT);
869 870 871 872 873 874 875 876 877 878 879 880 881 882
    if (ret == 0) {
        virDomainEventPtr event;

        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_SUSPENDED,
                                         VIR_DOMAIN_EVENT_SUSPENDED_MIGRATED);
        if (event)
            qemuDomainEventQueue(driver, event);
    }

    return ret;
}


883 884 885
static int
qemuMigrationUpdateJobStatus(struct qemud_driver *driver,
                             virDomainObjPtr vm,
886 887
                             const char *job,
                             enum qemuDomainAsyncJob asyncJob)
888
{
889
    qemuDomainObjPrivatePtr priv = vm->privateData;
890
    int ret;
891 892 893 894
    int status;
    unsigned long long memProcessed;
    unsigned long long memRemaining;
    unsigned long long memTotal;
895

896 897 898
    ret = qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob);
    if (ret < 0) {
        /* Guest already exited; nothing further to update.  */
899 900
        return -1;
    }
901 902 903 904 905 906
    ret = qemuMonitorGetMigrationStatus(priv->mon,
                                        &status,
                                        &memProcessed,
                                        &memRemaining,
                                        &memTotal);
    qemuDomainObjExitMonitorWithDriver(driver, vm);
907

908
    if (ret < 0 || virTimeMillisNow(&priv->job.info.timeElapsed) < 0) {
909
        priv->job.info.type = VIR_DOMAIN_JOB_FAILED;
910 911
        return -1;
    }
912
    priv->job.info.timeElapsed -= priv->job.start;
913

914
    ret = -1;
915 916
    switch (status) {
    case QEMU_MONITOR_MIGRATION_STATUS_INACTIVE:
917
        priv->job.info.type = VIR_DOMAIN_JOB_NONE;
918 919 920 921 922
        qemuReportError(VIR_ERR_OPERATION_FAILED,
                        _("%s: %s"), job, _("is not active"));
        break;

    case QEMU_MONITOR_MIGRATION_STATUS_ACTIVE:
923 924 925
        priv->job.info.dataTotal = memTotal;
        priv->job.info.dataRemaining = memRemaining;
        priv->job.info.dataProcessed = memProcessed;
926

927 928 929
        priv->job.info.memTotal = memTotal;
        priv->job.info.memRemaining = memRemaining;
        priv->job.info.memProcessed = memProcessed;
930 931 932 933 934

        ret = 0;
        break;

    case QEMU_MONITOR_MIGRATION_STATUS_COMPLETED:
935
        priv->job.info.type = VIR_DOMAIN_JOB_COMPLETED;
936 937 938 939
        ret = 0;
        break;

    case QEMU_MONITOR_MIGRATION_STATUS_ERROR:
940
        priv->job.info.type = VIR_DOMAIN_JOB_FAILED;
941 942 943 944 945
        qemuReportError(VIR_ERR_OPERATION_FAILED,
                        _("%s: %s"), job, _("unexpectedly failed"));
        break;

    case QEMU_MONITOR_MIGRATION_STATUS_CANCELLED:
946
        priv->job.info.type = VIR_DOMAIN_JOB_CANCELLED;
947
        qemuReportError(VIR_ERR_OPERATION_ABORTED,
948 949 950 951 952 953 954 955
                        _("%s: %s"), job, _("canceled by client"));
        break;
    }

    return ret;
}


956 957
static int
qemuMigrationWaitForCompletion(struct qemud_driver *driver, virDomainObjPtr vm,
958 959
                               enum qemuDomainAsyncJob asyncJob,
                               virConnectPtr dconn)
960
{
961
    qemuDomainObjPrivatePtr priv = vm->privateData;
962 963
    const char *job;

964 965
    switch (priv->job.asyncJob) {
    case QEMU_ASYNC_JOB_MIGRATION_OUT:
966 967
        job = _("migration job");
        break;
968
    case QEMU_ASYNC_JOB_SAVE:
969 970
        job = _("domain save job");
        break;
971
    case QEMU_ASYNC_JOB_DUMP:
972 973 974 975 976
        job = _("domain core dump job");
        break;
    default:
        job = _("job");
    }
977

978
    priv->job.info.type = VIR_DOMAIN_JOB_UNBOUNDED;
979

980
    while (priv->job.info.type == VIR_DOMAIN_JOB_UNBOUNDED) {
981 982 983
        /* Poll every 50ms for progress & to allow cancellation */
        struct timespec ts = { .tv_sec = 0, .tv_nsec = 50 * 1000 * 1000ull };

984
        if (qemuMigrationUpdateJobStatus(driver, vm, job, asyncJob) < 0)
985 986
            goto cleanup;

987 988 989 990 991 992
        if (dconn && virConnectIsAlive(dconn) <= 0) {
            qemuReportError(VIR_ERR_OPERATION_FAILED, "%s",
                            _("Lost connection to destination host"));
            goto cleanup;
        }

993 994 995 996 997 998 999 1000 1001 1002
        virDomainObjUnlock(vm);
        qemuDriverUnlock(driver);

        nanosleep(&ts, NULL);

        qemuDriverLock(driver);
        virDomainObjLock(vm);
    }

cleanup:
1003
    if (priv->job.info.type == VIR_DOMAIN_JOB_COMPLETED)
1004 1005 1006
        return 0;
    else
        return -1;
1007 1008 1009
}


1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
static int
qemuDomainMigrateGraphicsRelocate(struct qemud_driver *driver,
                                  virDomainObjPtr vm,
                                  qemuMigrationCookiePtr cookie)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;
    int ret;

    if (!cookie)
        return 0;

    if (!cookie->graphics)
        return 0;

    /* QEMU doesn't support VNC relocation yet, so
     * skip it to avoid generating an error
     */
    if (cookie->graphics->type != VIR_DOMAIN_GRAPHICS_TYPE_SPICE)
        return 0;

1030 1031
    ret = qemuDomainObjEnterMonitorAsync(driver, vm,
                                         QEMU_ASYNC_JOB_MIGRATION_OUT);
1032 1033 1034 1035 1036 1037 1038 1039 1040
    if (ret == 0) {
        ret = qemuMonitorGraphicsRelocate(priv->mon,
                                          cookie->graphics->type,
                                          cookie->remoteHostname,
                                          cookie->graphics->port,
                                          cookie->graphics->tlsPort,
                                          cookie->graphics->tlsSubject);
        qemuDomainObjExitMonitorWithDriver(driver, vm);
    }
1041 1042 1043 1044 1045

    return ret;
}


1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
/* This is called for outgoing non-p2p migrations when a connection to the
 * client which initiated the migration was closed but we were waiting for it
 * to follow up with the next phase, that is, in between
 * qemuDomainMigrateBegin3 and qemuDomainMigratePerform3 or
 * qemuDomainMigratePerform3 and qemuDomainMigrateConfirm3.
 */
virDomainObjPtr
qemuMigrationCleanup(struct qemud_driver *driver,
                     virDomainObjPtr vm,
                     virConnectPtr conn)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;

    VIR_DEBUG("vm=%s, conn=%p, asyncJob=%s, phase=%s",
              vm->def->name, conn,
              qemuDomainAsyncJobTypeToString(priv->job.asyncJob),
              qemuDomainAsyncJobPhaseToString(priv->job.asyncJob,
                                              priv->job.phase));

    if (!qemuMigrationJobIsActive(vm, QEMU_ASYNC_JOB_MIGRATION_OUT))
        goto cleanup;

    VIR_DEBUG("The connection which started outgoing migration of domain %s"
              " was closed; canceling the migration",
              vm->def->name);

    switch ((enum qemuMigrationJobPhase) priv->job.phase) {
    case QEMU_MIGRATION_PHASE_BEGIN3:
        /* just forget we were about to migrate */
        qemuDomainObjDiscardAsyncJob(driver, vm);
        break;

    case QEMU_MIGRATION_PHASE_PERFORM3_DONE:
        VIR_WARN("Migration of domain %s finished but we don't know if the"
                 " domain was successfully started on destination or not",
                 vm->def->name);
        /* clear the job and let higher levels decide what to do */
        qemuDomainObjDiscardAsyncJob(driver, vm);
        break;

    case QEMU_MIGRATION_PHASE_PERFORM3:
        /* cannot be seen without an active migration API; unreachable */
    case QEMU_MIGRATION_PHASE_CONFIRM3:
    case QEMU_MIGRATION_PHASE_CONFIRM3_CANCELLED:
        /* all done; unreachable */
    case QEMU_MIGRATION_PHASE_PREPARE:
    case QEMU_MIGRATION_PHASE_FINISH2:
    case QEMU_MIGRATION_PHASE_FINISH3:
        /* incoming migration; unreachable */
    case QEMU_MIGRATION_PHASE_PERFORM2:
        /* single phase outgoing migration; unreachable */
    case QEMU_MIGRATION_PHASE_NONE:
    case QEMU_MIGRATION_PHASE_LAST:
        /* unreachable */
        ;
    }

cleanup:
    return vm;
}

1107
/* The caller is supposed to lock the vm and start a migration job. */
1108 1109
char *qemuMigrationBegin(struct qemud_driver *driver,
                         virDomainObjPtr vm,
1110
                         const char *xmlin,
1111
                         const char *dname,
1112
                         char **cookieout,
1113 1114
                         int *cookieoutlen,
                         unsigned long flags)
1115 1116 1117
{
    char *rv = NULL;
    qemuMigrationCookiePtr mig = NULL;
1118
    virDomainDefPtr def = NULL;
1119 1120
    qemuDomainObjPrivatePtr priv = vm->privateData;

1121
    VIR_DEBUG("driver=%p, vm=%p, xmlin=%s, dname=%s,"
1122
              " cookieout=%p, cookieoutlen=%p, flags=%lx",
1123
              driver, vm, NULLSTR(xmlin), NULLSTR(dname),
1124
              cookieout, cookieoutlen, flags);
1125

1126 1127 1128 1129 1130 1131
    /* Only set the phase if we are inside QEMU_ASYNC_JOB_MIGRATION_OUT.
     * Otherwise we will start the async job later in the perform phase losing
     * change protection.
     */
    if (priv->job.asyncJob == QEMU_ASYNC_JOB_MIGRATION_OUT)
        qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_BEGIN3);
1132

1133
    if (!qemuMigrationIsAllowed(driver, vm, NULL))
1134 1135
        goto cleanup;

1136 1137 1138
    if (!(flags & VIR_MIGRATE_UNSAFE) && !qemuMigrationIsSafe(vm->def))
        goto cleanup;

1139
    if (!(mig = qemuMigrationEatCookie(driver, vm, NULL, 0, 0)))
1140 1141 1142 1143
        goto cleanup;

    if (qemuMigrationBakeCookie(mig, driver, vm,
                                cookieout, cookieoutlen,
1144
                                QEMU_MIGRATION_COOKIE_LOCKSTATE) < 0)
1145 1146
        goto cleanup;

1147 1148
    if (xmlin) {
        if (!(def = virDomainDefParseString(driver->caps, xmlin,
M
Matthias Bolte 已提交
1149
                                            QEMU_EXPECTED_VIRT_TYPES,
1150 1151 1152
                                            VIR_DOMAIN_XML_INACTIVE)))
            goto cleanup;

1153
        if (STRNEQ(def->name, vm->def->name)) {
1154
            qemuReportError(VIR_ERR_INVALID_ARG, "%s",
1155
                            _("target domain name doesn't match source name"));
1156 1157 1158
            goto cleanup;
        }

1159
        if (!virDomainDefCheckABIStability(vm->def, def))
1160 1161
            goto cleanup;

1162
        rv = qemuDomainDefFormatLive(driver, def, false, true);
1163
    } else {
1164
        rv = qemuDomainDefFormatLive(driver, vm->def, false, true);
1165
    }
1166 1167 1168

cleanup:
    qemuMigrationCookieFree(mig);
1169
    virDomainDefFree(def);
1170 1171 1172 1173
    return rv;
}


1174 1175
/* Prepare is the first step, and it runs on the destination host.
 */
1176

1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
static void
qemuMigrationPrepareCleanup(struct qemud_driver *driver,
                            virDomainObjPtr vm)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;

    VIR_DEBUG("driver=%p, vm=%s, job=%s, asyncJob=%s",
              driver,
              vm->def->name,
              qemuDomainJobTypeToString(priv->job.active),
              qemuDomainAsyncJobTypeToString(priv->job.asyncJob));

    if (!qemuMigrationJobIsActive(vm, QEMU_ASYNC_JOB_MIGRATION_IN))
        return;
    qemuDomainObjDiscardAsyncJob(driver, vm);
}

1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
static int
qemuMigrationPrepareAny(struct qemud_driver *driver,
                        virConnectPtr dconn,
                        const char *cookiein,
                        int cookieinlen,
                        char **cookieout,
                        int *cookieoutlen,
                        const char *dname,
                        const char *dom_xml,
                        const char *migrateFrom,
                        virStreamPtr st)
1205 1206 1207 1208 1209
{
    virDomainDefPtr def = NULL;
    virDomainObjPtr vm = NULL;
    virDomainEventPtr event = NULL;
    int ret = -1;
1210
    int dataFD[2] = { -1, -1 };
1211
    qemuDomainObjPrivatePtr priv = NULL;
J
Jiri Denemark 已提交
1212
    unsigned long long now;
1213
    qemuMigrationCookiePtr mig = NULL;
1214
    bool tunnel = !!st;
J
Jiri Denemark 已提交
1215
    char *origname = NULL;
J
Jiri Denemark 已提交
1216
    char *xmlout = NULL;
1217

1218
    if (virTimeMillisNow(&now) < 0)
1219 1220 1221
        return -1;

    if (!(def = virDomainDefParseString(driver->caps, dom_xml,
M
Matthias Bolte 已提交
1222
                                        QEMU_EXPECTED_VIRT_TYPES,
1223 1224 1225
                                        VIR_DOMAIN_XML_INACTIVE)))
        goto cleanup;

1226
    if (!qemuMigrationIsAllowed(driver, NULL, def))
1227 1228 1229 1230
        goto cleanup;

    /* Target domain name, maybe renamed. */
    if (dname) {
J
Jiri Denemark 已提交
1231
        origname = def->name;
1232 1233 1234 1235 1236
        def->name = strdup(dname);
        if (def->name == NULL)
            goto cleanup;
    }

J
Jiri Denemark 已提交
1237 1238 1239 1240 1241
    /* Let migration hook filter domain XML */
    if (virHookPresent(VIR_HOOK_DRIVER_QEMU)) {
        char *xml;
        int hookret;

1242
        if (!(xml = qemuDomainDefFormatXML(driver, def,
1243
                                           VIR_DOMAIN_XML_SECURE, false)))
J
Jiri Denemark 已提交
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277
            goto cleanup;

        hookret = virHookCall(VIR_HOOK_DRIVER_QEMU, def->name,
                              VIR_HOOK_QEMU_OP_MIGRATE, VIR_HOOK_SUBOP_BEGIN,
                              NULL, xml, &xmlout);
        VIR_FREE(xml);

        if (hookret < 0) {
            goto cleanup;
        } else if (hookret == 0) {
            if (!*xmlout) {
                VIR_DEBUG("Migrate hook filter returned nothing; using the"
                          " original XML");
            } else {
                virDomainDefPtr newdef;

                VIR_DEBUG("Using hook-filtered domain XML: %s", xmlout);
                newdef = virDomainDefParseString(driver->caps, xmlout,
                                                 QEMU_EXPECTED_VIRT_TYPES,
                                                 VIR_DOMAIN_XML_INACTIVE);
                if (!newdef)
                    goto cleanup;

                if (!virDomainDefCheckABIStability(def, newdef)) {
                    virDomainDefFree(newdef);
                    goto cleanup;
                }

                virDomainDefFree(def);
                def = newdef;
            }
        }
    }

1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
    if (virDomainObjIsDuplicate(&driver->domains, def, 1) < 0)
        goto cleanup;

    if (!(vm = virDomainAssignDef(driver->caps,
                                  &driver->domains,
                                  def, true))) {
        /* virDomainAssignDef already set the error */
        goto cleanup;
    }
    def = NULL;
    priv = vm->privateData;
J
Jiri Denemark 已提交
1289 1290
    priv->origname = origname;
    origname = NULL;
1291

1292 1293
    if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen,
                                       QEMU_MIGRATION_COOKIE_LOCKSTATE)))
1294 1295
        goto cleanup;

1296
    if (qemuMigrationJobStart(driver, vm, QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
1297
        goto cleanup;
1298
    qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_PREPARE);
1299 1300 1301 1302

    /* Domain starts inactive, even if the domain XML had an id field. */
    vm->def->id = -1;

1303 1304
    if (tunnel &&
        (pipe(dataFD) < 0 || virSetCloseExec(dataFD[1]) < 0)) {
1305 1306
        virReportSystemError(errno, "%s",
                             _("cannot create pipe for tunnelled migration"));
1307 1308 1309 1310
        goto endjob;
    }

    /* Start the QEMU daemon, with the same command-line arguments plus
1311
     * -incoming $migrateFrom
1312
     */
1313
    if (qemuProcessStart(dconn, driver, vm, migrateFrom, false, true,
1314
                         true, dataFD[0], NULL, NULL,
1315
                         VIR_NETDEV_VPORT_PROFILE_OP_MIGRATE_IN_START) < 0) {
1316
        virDomainAuditStart(vm, "migrated", false);
1317 1318 1319 1320 1321 1322
        /* Note that we don't set an error here because qemuProcessStart
         * should have already done that.
         */
        goto endjob;
    }

1323 1324 1325 1326 1327 1328 1329
    if (tunnel) {
        if (virFDStreamOpen(st, dataFD[1]) < 0) {
            virReportSystemError(errno, "%s",
                                 _("cannot pass pipe for tunnelled migration"));
            virDomainAuditStart(vm, "migrated", false);
            qemuProcessStop(driver, vm, 0, VIR_DOMAIN_SHUTOFF_FAILED);
            goto endjob;
1330
        }
1331
        dataFD[1] = -1; /* 'st' owns the FD now & will close it */
1332 1333
    }

1334 1335 1336 1337 1338 1339 1340 1341
    if (mig->lockState) {
        VIR_DEBUG("Received lockstate %s", mig->lockState);
        VIR_FREE(priv->lockState);
        priv->lockState = mig->lockState;
        mig->lockState = NULL;
    } else {
        VIR_DEBUG("Received no lockstate");
    }
1342

1343 1344
    if (qemuMigrationBakeCookie(mig, driver, vm, cookieout, cookieoutlen,
                                QEMU_MIGRATION_COOKIE_GRAPHICS) < 0) {
1345 1346 1347 1348 1349 1350 1351
        /* We could tear down the whole guest here, but
         * cookie data is (so far) non-critical, so that
         * seems a little harsh. We'll just warn for now.
         */
        VIR_WARN("Unable to encode migration cookie");
    }

1352 1353 1354
    if (qemuDomainCleanupAdd(vm, qemuMigrationPrepareCleanup) < 0)
        goto endjob;

1355 1356 1357 1358
    virDomainAuditStart(vm, "migrated", true);
    event = virDomainEventNewFromObj(vm,
                                     VIR_DOMAIN_EVENT_STARTED,
                                     VIR_DOMAIN_EVENT_STARTED_MIGRATED);
1359

1360 1361 1362 1363 1364
    /* We keep the job active across API calls until the finish() call.
     * This prevents any other APIs being invoked while incoming
     * migration is taking place.
     */
    if (qemuMigrationJobContinue(vm) == 0) {
1365
        vm = NULL;
1366 1367 1368
        qemuReportError(VIR_ERR_OPERATION_FAILED,
                        "%s", _("domain disappeared"));
        goto cleanup;
1369
    }
1370

1371
    ret = 0;
1372 1373

cleanup:
J
Jiri Denemark 已提交
1374
    VIR_FREE(origname);
J
Jiri Denemark 已提交
1375
    VIR_FREE(xmlout);
1376
    virDomainDefFree(def);
1377 1378
    VIR_FORCE_CLOSE(dataFD[0]);
    VIR_FORCE_CLOSE(dataFD[1]);
1379 1380 1381 1382 1383 1384
    if (vm) {
        if (ret >= 0 || vm->persistent)
            virDomainObjUnlock(vm);
        else
            qemuDomainRemoveInactive(driver, vm);
    }
1385 1386
    if (event)
        qemuDomainEventQueue(driver, event);
1387
    qemuMigrationCookieFree(mig);
1388
    return ret;
1389 1390 1391 1392 1393 1394

endjob:
    if (qemuMigrationJobFinish(driver, vm) == 0) {
        vm = NULL;
    }
    goto cleanup;
1395 1396 1397
}


1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429
/*
 * This version starts an empty VM listening on a localhost TCP port, and
 * sets up the corresponding virStream to handle the incoming data.
 */
int
qemuMigrationPrepareTunnel(struct qemud_driver *driver,
                           virConnectPtr dconn,
                           const char *cookiein,
                           int cookieinlen,
                           char **cookieout,
                           int *cookieoutlen,
                           virStreamPtr st,
                           const char *dname,
                           const char *dom_xml)
{
    int ret;

    VIR_DEBUG("driver=%p, dconn=%p, cookiein=%s, cookieinlen=%d, "
              "cookieout=%p, cookieoutlen=%p, st=%p, dname=%s, dom_xml=%s",
              driver, dconn, NULLSTR(cookiein), cookieinlen,
              cookieout, cookieoutlen, st, NULLSTR(dname), dom_xml);

    /* QEMU will be started with -incoming stdio (which qemu_command might
     * convert to exec:cat or fd:n)
     */
    ret = qemuMigrationPrepareAny(driver, dconn, cookiein, cookieinlen,
                                  cookieout, cookieoutlen, dname, dom_xml,
                                  "stdio", st);
    return ret;
}


1430 1431 1432
int
qemuMigrationPrepareDirect(struct qemud_driver *driver,
                           virConnectPtr dconn,
1433 1434 1435 1436
                           const char *cookiein,
                           int cookieinlen,
                           char **cookieout,
                           int *cookieoutlen,
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
                           const char *uri_in,
                           char **uri_out,
                           const char *dname,
                           const char *dom_xml)
{
    static int port = 0;
    int this_port;
    char *hostname = NULL;
    char migrateFrom [64];
    const char *p;
    int ret = -1;
J
Jiri Denemark 已提交
1448

1449 1450 1451 1452 1453 1454
    VIR_DEBUG("driver=%p, dconn=%p, cookiein=%s, cookieinlen=%d, "
              "cookieout=%p, cookieoutlen=%p, uri_in=%s, uri_out=%p, "
              "dname=%s, dom_xml=%s",
              driver, dconn, NULLSTR(cookiein), cookieinlen,
              cookieout, cookieoutlen, NULLSTR(uri_in), uri_out,
              NULLSTR(dname), dom_xml);
1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475

    /* The URI passed in may be NULL or a string "tcp://somehostname:port".
     *
     * If the URI passed in is NULL then we allocate a port number
     * from our pool of port numbers and return a URI of
     * "tcp://ourhostname:port".
     *
     * If the URI passed in is not NULL then we try to parse out the
     * port number and use that (note that the hostname is assumed
     * to be a correct hostname which refers to the target machine).
     */
    if (uri_in == NULL) {
        this_port = QEMUD_MIGRATION_FIRST_PORT + port++;
        if (port == QEMUD_MIGRATION_NUM_PORTS) port = 0;

        /* Get hostname */
        if ((hostname = virGetHostname(NULL)) == NULL)
            goto cleanup;

        if (STRPREFIX(hostname, "localhost")) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
1476 1477
                            _("hostname on destination resolved to localhost,"
                              " but migration requires an FQDN"));
1478 1479 1480 1481 1482
            goto cleanup;
        }

        /* XXX this really should have been a properly well-formed
         * URI, but we can't add in tcp:// now without breaking
1483
         * compatibility with old targets. We at least make the
1484 1485 1486
         * new targets accept both syntaxes though.
         */
        /* Caller frees */
1487
        if (virAsprintf(uri_out, "tcp:%s:%d", hostname, this_port) < 0) {
1488 1489 1490 1491 1492 1493 1494 1495 1496
            virReportOOMError();
            goto cleanup;
        }
    } else {
        /* Check the URI starts with "tcp:".  We will escape the
         * URI when passing it to the qemu monitor, so bad
         * characters in hostname part don't matter.
         */
        if (!STRPREFIX (uri_in, "tcp:")) {
1497 1498 1499
            qemuReportError(VIR_ERR_INVALID_ARG, "%s",
                            _("only tcp URIs are supported for KVM/QEMU"
                              " migrations"));
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
            goto cleanup;
        }

        /* Get the port number. */
        p = strrchr (uri_in, ':');
        if (p == strchr(uri_in, ':')) {
            /* Generate a port */
            this_port = QEMUD_MIGRATION_FIRST_PORT + port++;
            if (port == QEMUD_MIGRATION_NUM_PORTS)
                port = 0;

            /* Caller frees */
            if (virAsprintf(uri_out, "%s:%d", uri_in, this_port) < 0) {
                virReportOOMError();
                goto cleanup;
            }

        } else {
            p++; /* definitely has a ':' in it, see above */
            this_port = virParseNumber (&p);
            if (this_port == -1 || p-uri_in != strlen (uri_in)) {
                qemuReportError(VIR_ERR_INVALID_ARG,
                                "%s", _("URI ended with incorrect ':port'"));
                goto cleanup;
            }
        }
    }

    if (*uri_out)
        VIR_DEBUG("Generated uri_out=%s", *uri_out);

1531
    /* QEMU will be started with -incoming tcp:0.0.0.0:port */
1532
    snprintf(migrateFrom, sizeof(migrateFrom), "tcp:0.0.0.0:%d", this_port);
1533

1534 1535 1536
    ret = qemuMigrationPrepareAny(driver, dconn, cookiein, cookieinlen,
                                  cookieout, cookieoutlen, dname, dom_xml,
                                  migrateFrom, NULL);
1537 1538 1539 1540 1541 1542 1543 1544
cleanup:
    VIR_FREE(hostname);
    if (ret != 0)
        VIR_FREE(*uri_out);
    return ret;
}


1545 1546
enum qemuMigrationDestinationType {
    MIGRATION_DEST_HOST,
1547
    MIGRATION_DEST_CONNECT_HOST,
1548
    MIGRATION_DEST_UNIX,
1549
    MIGRATION_DEST_FD,
1550
};
1551

1552 1553 1554 1555
enum qemuMigrationForwardType {
    MIGRATION_FWD_DIRECT,
    MIGRATION_FWD_STREAM,
};
1556

1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567
typedef struct _qemuMigrationSpec qemuMigrationSpec;
typedef qemuMigrationSpec *qemuMigrationSpecPtr;
struct _qemuMigrationSpec {
    enum qemuMigrationDestinationType destType;
    union {
        struct {
            const char *name;
            int port;
        } host;

        struct {
1568
            char *file;
1569 1570
            int sock;
        } unix_socket;
1571 1572 1573 1574 1575

        struct {
            int qemu;
            int local;
        } fd;
1576 1577 1578 1579 1580 1581 1582
    } dest;

    enum qemuMigrationForwardType fwdType;
    union {
        virStreamPtr stream;
    } fwd;
};
1583 1584 1585

#define TUNNEL_SEND_BUF_SIZE 65536

1586 1587 1588 1589 1590 1591 1592
typedef struct _qemuMigrationIOThread qemuMigrationIOThread;
typedef qemuMigrationIOThread *qemuMigrationIOThreadPtr;
struct _qemuMigrationIOThread {
    virThread thread;
    virStreamPtr st;
    int sock;
    virError err;
1593 1594
    int wakeupRecvFD;
    int wakeupSendFD;
1595 1596 1597
};

static void qemuMigrationIOFunc(void *arg)
1598
{
1599
    qemuMigrationIOThreadPtr data = arg;
1600 1601 1602 1603 1604 1605 1606
    char *buffer = NULL;
    struct pollfd fds[2];
    int timeout = -1;
    virErrorPtr err = NULL;

    VIR_DEBUG("Running migration tunnel; stream=%p, sock=%d",
              data->st, data->sock);
1607 1608 1609

    if (VIR_ALLOC_N(buffer, TUNNEL_SEND_BUF_SIZE) < 0) {
        virReportOOMError();
1610
        goto abrt;
1611 1612
    }

1613 1614 1615
    fds[0].fd = data->sock;
    fds[1].fd = data->wakeupRecvFD;

1616
    for (;;) {
1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
        int ret;

        fds[0].events = fds[1].events = POLLIN;
        fds[0].revents = fds[1].revents = 0;

        ret = poll(fds, ARRAY_CARDINALITY(fds), timeout);

        if (ret < 0) {
            if (errno == EAGAIN || errno == EINTR)
                continue;
1627
            virReportSystemError(errno, "%s",
1628 1629
                                 _("poll failed in migration tunnel"));
            goto abrt;
1630
        }
1631 1632 1633 1634 1635 1636 1637

        if (ret == 0) {
            /* We were asked to gracefully stop but reading would block. This
             * can only happen if qemu told us migration finished but didn't
             * close the migration fd. We handle this in the same way as EOF.
             */
            VIR_DEBUG("QEMU forgot to close migration fd");
1638
            break;
1639
        }
1640

1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
        if (fds[1].revents & (POLLIN | POLLERR | POLLHUP)) {
            char stop = 0;

            if (saferead(data->wakeupRecvFD, &stop, 1) != 1) {
                virReportSystemError(errno, "%s",
                                     _("failed to read from wakeup fd"));
                goto abrt;
            }

            VIR_DEBUG("Migration tunnel was asked to %s",
                      stop ? "abort" : "finish");
            if (stop) {
                goto abrt;
            } else {
                timeout = 0;
            }
1657 1658
        }

1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
        if (fds[0].revents & (POLLIN | POLLERR | POLLHUP)) {
            int nbytes;

            nbytes = saferead(data->sock, buffer, TUNNEL_SEND_BUF_SIZE);
            if (nbytes > 0) {
                if (virStreamSend(data->st, buffer, nbytes) < 0)
                    goto error;
            } else if (nbytes < 0) {
                virReportSystemError(errno, "%s",
                        _("tunnelled migration failed to read from qemu"));
                goto abrt;
            } else {
                /* EOF; get out of here */
                break;
            }
        }
    }
1676

1677 1678
    if (virStreamFinish(data->st) < 0)
        goto error;
1679

1680 1681
    VIR_FREE(buffer);

1682 1683
    return;

1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
abrt:
    err = virSaveLastError();
    if (err && err->code == VIR_ERR_OK) {
        virFreeError(err);
        err = NULL;
    }
    virStreamAbort(data->st);
    if (err) {
        virSetError(err);
        virFreeError(err);
    }

1696 1697 1698
error:
    virCopyLastError(&data->err);
    virResetLastError();
1699
    VIR_FREE(buffer);
1700 1701 1702 1703 1704 1705 1706
}


static qemuMigrationIOThreadPtr
qemuMigrationStartTunnel(virStreamPtr st,
                         int sock)
{
1707 1708
    qemuMigrationIOThreadPtr io = NULL;
    int wakeupFD[2] = { -1, -1 };
1709

1710 1711 1712 1713
    if (pipe2(wakeupFD, O_CLOEXEC) < 0) {
        virReportSystemError(errno, "%s",
                             _("Unable to make pipe"));
        goto error;
1714 1715
    }

1716 1717 1718
    if (VIR_ALLOC(io) < 0)
        goto no_memory;

1719 1720
    io->st = st;
    io->sock = sock;
1721 1722
    io->wakeupRecvFD = wakeupFD[0];
    io->wakeupSendFD = wakeupFD[1];
1723 1724 1725 1726 1727 1728

    if (virThreadCreate(&io->thread, true,
                        qemuMigrationIOFunc,
                        io) < 0) {
        virReportSystemError(errno, "%s",
                             _("Unable to create migration thread"));
1729
        goto error;
1730 1731 1732
    }

    return io;
1733 1734 1735 1736 1737 1738 1739 1740

no_memory:
    virReportOOMError();
error:
    VIR_FORCE_CLOSE(wakeupFD[0]);
    VIR_FORCE_CLOSE(wakeupFD[1]);
    VIR_FREE(io);
    return NULL;
1741 1742 1743
}

static int
1744
qemuMigrationStopTunnel(qemuMigrationIOThreadPtr io, bool error)
1745 1746
{
    int rv = -1;
1747 1748 1749 1750 1751 1752 1753 1754 1755
    char stop = error ? 1 : 0;

    /* make sure the thread finishes its job and is joinable */
    if (safewrite(io->wakeupSendFD, &stop, 1) != 1) {
        virReportSystemError(errno, "%s",
                             _("failed to wakeup migration tunnel"));
        goto cleanup;
    }

1756 1757 1758 1759
    virThreadJoin(&io->thread);

    /* Forward error from the IO thread, to this thread */
    if (io->err.code != VIR_ERR_OK) {
1760 1761 1762 1763
        if (error)
            rv = 0;
        else
            virSetError(&io->err);
1764 1765 1766 1767 1768 1769 1770
        virResetError(&io->err);
        goto cleanup;
    }

    rv = 0;

cleanup:
1771 1772
    VIR_FORCE_CLOSE(io->wakeupSendFD);
    VIR_FORCE_CLOSE(io->wakeupRecvFD);
1773 1774
    VIR_FREE(io);
    return rv;
1775 1776
}

1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
static int
qemuMigrationConnect(struct qemud_driver *driver,
                     virDomainObjPtr vm,
                     qemuMigrationSpecPtr spec)
{
    virNetSocketPtr sock;
    const char *host;
    char *port = NULL;
    int ret = -1;

    host = spec->dest.host.name;
    if (virAsprintf(&port, "%d", spec->dest.host.port) < 0) {
        virReportOOMError();
        return -1;
    }

    spec->destType = MIGRATION_DEST_FD;
    spec->dest.fd.qemu = -1;

    if (virSecurityManagerSetSocketLabel(driver->securityManager, vm->def) < 0)
        goto cleanup;
    if (virNetSocketNewConnectTCP(host, port, &sock) == 0) {
        spec->dest.fd.qemu = virNetSocketDupFD(sock, true);
        virNetSocketFree(sock);
    }
    if (virSecurityManagerClearSocketLabel(driver->securityManager, vm->def) < 0 ||
        spec->dest.fd.qemu == -1)
        goto cleanup;

    ret = 0;

cleanup:
    VIR_FREE(port);
    if (ret < 0)
        VIR_FORCE_CLOSE(spec->dest.fd.qemu);
    return ret;
}

1815 1816 1817 1818 1819 1820 1821 1822 1823
static int
qemuMigrationRun(struct qemud_driver *driver,
                 virDomainObjPtr vm,
                 const char *cookiein,
                 int cookieinlen,
                 char **cookieout,
                 int *cookieoutlen,
                 unsigned long flags,
                 unsigned long resource,
1824 1825
                 qemuMigrationSpecPtr spec,
                 virConnectPtr dconn)
1826
{
1827
    int ret = -1;
1828 1829
    unsigned int migrate_flags = QEMU_MONITOR_MIGRATE_BACKGROUND;
    qemuDomainObjPrivatePtr priv = vm->privateData;
1830
    qemuMigrationCookiePtr mig = NULL;
1831
    qemuMigrationIOThreadPtr iothread = NULL;
1832
    int fd = -1;
1833
    unsigned long migrate_speed = resource ? resource : priv->migMaxBandwidth;
1834
    virErrorPtr orig_err = NULL;
1835 1836 1837 1838 1839 1840 1841

    VIR_DEBUG("driver=%p, vm=%p, cookiein=%s, cookieinlen=%d, "
              "cookieout=%p, cookieoutlen=%p, flags=%lx, resource=%lu, "
              "spec=%p (dest=%d, fwd=%d)",
              driver, vm, NULLSTR(cookiein), cookieinlen,
              cookieout, cookieoutlen, flags, resource,
              spec, spec->destType, spec->fwdType);
1842

1843 1844 1845
    if (virLockManagerPluginUsesState(driver->lockManager) &&
        !cookieout) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
1846 1847
                        _("Migration with lock driver %s requires"
                          " cookie support"),
1848 1849 1850 1851 1852
                        virLockManagerPluginGetName(driver->lockManager));
        return -1;
    }

    if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen,
1853 1854 1855 1856 1857 1858
                                       QEMU_MIGRATION_COOKIE_GRAPHICS)))
        goto cleanup;

    if (qemuDomainMigrateGraphicsRelocate(driver, vm, mig) < 0)
        VIR_WARN("unable to provide data for graphics client relocation");

1859
    /* Before EnterMonitor, since qemuMigrationSetOffline already does that */
1860 1861 1862 1863 1864 1865
    if (!(flags & VIR_MIGRATE_LIVE) &&
        virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING) {
        if (qemuMigrationSetOffline(driver, vm) < 0)
            goto cleanup;
    }

1866 1867
    if (qemuDomainObjEnterMonitorAsync(driver, vm,
                                       QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
1868 1869
        goto cleanup;

1870
    if (qemuMonitorSetMigrationSpeed(priv->mon, migrate_speed) < 0) {
1871 1872 1873
        qemuDomainObjExitMonitorWithDriver(driver, vm);
        goto cleanup;
    }
1874

1875
    if (flags & VIR_MIGRATE_NON_SHARED_DISK)
1876 1877
        migrate_flags |= QEMU_MONITOR_MIGRATE_NON_SHARED_DISK;

1878
    if (flags & VIR_MIGRATE_NON_SHARED_INC)
1879 1880
        migrate_flags |= QEMU_MONITOR_MIGRATE_NON_SHARED_INC;

1881 1882
    /* connect to the destination qemu if needed */
    if (spec->destType == MIGRATION_DEST_CONNECT_HOST &&
1883 1884
        qemuMigrationConnect(driver, vm, spec) < 0) {
        qemuDomainObjExitMonitorWithDriver(driver, vm);
1885
        goto cleanup;
1886
    }
1887

1888 1889 1890 1891 1892 1893 1894
    switch (spec->destType) {
    case MIGRATION_DEST_HOST:
        ret = qemuMonitorMigrateToHost(priv->mon, migrate_flags,
                                       spec->dest.host.name,
                                       spec->dest.host.port);
        break;

1895 1896 1897 1898
    case MIGRATION_DEST_CONNECT_HOST:
        /* handled above and transformed into MIGRATION_DEST_FD */
        break;

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909
    case MIGRATION_DEST_UNIX:
        if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_UNIX)) {
            ret = qemuMonitorMigrateToUnix(priv->mon, migrate_flags,
                                           spec->dest.unix_socket.file);
        } else {
            const char *args[] = {
                "nc", "-U", spec->dest.unix_socket.file, NULL
            };
            ret = qemuMonitorMigrateToCommand(priv->mon, migrate_flags, args);
        }
        break;
1910 1911

    case MIGRATION_DEST_FD:
1912
        if (spec->fwdType != MIGRATION_FWD_DIRECT) {
1913
            fd = spec->dest.fd.local;
1914 1915
            spec->dest.fd.local = -1;
        }
1916 1917 1918 1919
        ret = qemuMonitorMigrateToFd(priv->mon, migrate_flags,
                                     spec->dest.fd.qemu);
        VIR_FORCE_CLOSE(spec->dest.fd.qemu);
        break;
1920 1921
    }
    qemuDomainObjExitMonitorWithDriver(driver, vm);
1922
    if (ret < 0)
1923 1924
        goto cleanup;
    ret = -1;
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934

    if (!virDomainObjIsActive(vm)) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("guest unexpectedly quit"));
        goto cleanup;
    }

    /* From this point onwards we *must* call cancel to abort the
     * migration on source if anything goes wrong */

1935 1936 1937 1938 1939 1940 1941 1942
    if (spec->destType == MIGRATION_DEST_UNIX) {
        /* It is also possible that the migrate didn't fail initially, but
         * rather failed later on.  Check its status before waiting for a
         * connection from qemu which may never be initiated.
         */
        if (qemuMigrationUpdateJobStatus(driver, vm, _("migration job"),
                                         QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
            goto cancel;
1943

1944 1945 1946 1947 1948 1949 1950
        while ((fd = accept(spec->dest.unix_socket.sock, NULL, NULL)) < 0) {
            if (errno == EAGAIN || errno == EINTR)
                continue;
            virReportSystemError(errno, "%s",
                                 _("failed to accept connection from qemu"));
            goto cancel;
        }
1951 1952
    }

1953 1954
    if (spec->fwdType != MIGRATION_FWD_DIRECT &&
        !(iothread = qemuMigrationStartTunnel(spec->fwd.stream, fd)))
1955 1956
        goto cancel;

1957
    if (qemuMigrationWaitForCompletion(driver, vm,
1958 1959
                                       QEMU_ASYNC_JOB_MIGRATION_OUT,
                                       dconn) < 0)
1960
        goto cleanup;
1961

1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
    /* When migration completed, QEMU will have paused the
     * CPUs for us, but unless we're using the JSON monitor
     * we won't have been notified of this, so might still
     * think we're running. For v2 protocol this doesn't
     * matter because we'll kill the VM soon, but for v3
     * this is important because we stay paused until the
     * confirm3 step, but need to release the lock state
     */
    if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING) {
        if (qemuMigrationSetOffline(driver, vm) < 0)
            goto cleanup;
    }

1975
    ret = 0;
1976

1977
cleanup:
1978 1979 1980
    if (ret < 0 && !orig_err)
        orig_err = virSaveLastError();

1981
    if (spec->fwdType != MIGRATION_FWD_DIRECT) {
1982
        if (iothread && qemuMigrationStopTunnel(iothread, ret < 0) < 0)
1983
            ret = -1;
1984
        VIR_FORCE_CLOSE(fd);
1985
    }
1986

1987
    if (ret == 0 &&
1988 1989
        qemuMigrationBakeCookie(mig, driver, vm, cookieout, cookieoutlen,
                                QEMU_MIGRATION_COOKIE_PERSISTENT ) < 0)
1990 1991
        VIR_WARN("Unable to encode migration cookie");

1992 1993
    qemuMigrationCookieFree(mig);

1994 1995 1996 1997 1998
    if (orig_err) {
        virSetError(orig_err);
        virFreeError(orig_err);
    }

1999 2000
    return ret;

2001
cancel:
2002 2003
    orig_err = virSaveLastError();

2004
    if (virDomainObjIsActive(vm)) {
2005 2006
        if (qemuDomainObjEnterMonitorAsync(driver, vm,
                                           QEMU_ASYNC_JOB_MIGRATION_OUT) == 0) {
2007 2008 2009
            qemuMonitorMigrateCancel(priv->mon);
            qemuDomainObjExitMonitorWithDriver(driver, vm);
        }
2010
    }
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
    goto cleanup;
}

/* Perform migration using QEMU's native TCP migrate support,
 * not encrypted obviously
 */
static int doNativeMigrate(struct qemud_driver *driver,
                           virDomainObjPtr vm,
                           const char *uri,
                           const char *cookiein,
                           int cookieinlen,
                           char **cookieout,
                           int *cookieoutlen,
                           unsigned long flags,
2025 2026
                           unsigned long resource,
                           virConnectPtr dconn)
2027
{
2028
    qemuDomainObjPrivatePtr priv = vm->privateData;
M
Martin Kletzander 已提交
2029
    virURIPtr uribits = NULL;
2030
    int ret = -1;
2031 2032 2033 2034 2035 2036 2037 2038
    qemuMigrationSpec spec;

    VIR_DEBUG("driver=%p, vm=%p, uri=%s, cookiein=%s, cookieinlen=%d, "
              "cookieout=%p, cookieoutlen=%p, flags=%lx, resource=%lu",
              driver, vm, uri, NULLSTR(cookiein), cookieinlen,
              cookieout, cookieoutlen, flags, resource);

    if (STRPREFIX(uri, "tcp:") && !STRPREFIX(uri, "tcp://")) {
2039
        char *tmp;
2040
        /* HACK: source host generates bogus URIs, so fix them up */
2041
        if (virAsprintf(&tmp, "tcp://%s", uri + strlen("tcp:")) < 0) {
2042 2043 2044
            virReportOOMError();
            return -1;
        }
M
Martin Kletzander 已提交
2045
        uribits = virURIParse(tmp);
2046
        VIR_FREE(tmp);
2047
    } else {
M
Martin Kletzander 已提交
2048
        uribits = virURIParse(uri);
2049
    }
2050
    if (!uribits)
2051 2052
        return -1;

2053 2054 2055
    if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD))
        spec.destType = MIGRATION_DEST_CONNECT_HOST;
    else
2056
        spec.destType = MIGRATION_DEST_HOST;
2057 2058 2059
    spec.dest.host.name = uribits->server;
    spec.dest.host.port = uribits->port;
    spec.fwdType = MIGRATION_FWD_DIRECT;
2060

2061
    ret = qemuMigrationRun(driver, vm, cookiein, cookieinlen, cookieout,
2062
                           cookieoutlen, flags, resource, &spec, dconn);
2063 2064 2065 2066

    if (spec.destType == MIGRATION_DEST_FD)
        VIR_FORCE_CLOSE(spec.dest.fd.qemu);

2067
    virURIFree(uribits);
2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080

    return ret;
}


static int doTunnelMigrate(struct qemud_driver *driver,
                           virDomainObjPtr vm,
                           virStreamPtr st,
                           const char *cookiein,
                           int cookieinlen,
                           char **cookieout,
                           int *cookieoutlen,
                           unsigned long flags,
2081 2082
                           unsigned long resource,
                           virConnectPtr dconn)
2083 2084
{
    qemuDomainObjPrivatePtr priv = vm->privateData;
2085
    virNetSocketPtr sock = NULL;
2086 2087 2088 2089 2090 2091 2092 2093
    int ret = -1;
    qemuMigrationSpec spec;

    VIR_DEBUG("driver=%p, vm=%p, st=%p, cookiein=%s, cookieinlen=%d, "
              "cookieout=%p, cookieoutlen=%p, flags=%lx, resource=%lu",
              driver, vm, st, NULLSTR(cookiein), cookieinlen,
              cookieout, cookieoutlen, flags, resource);

2094 2095
    if (!qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD) &&
        !qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_UNIX) &&
2096
        !qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_EXEC)) {
2097 2098 2099
        qemuReportError(VIR_ERR_OPERATION_FAILED, "%s",
                        _("Source qemu is too old to support tunnelled migration"));
        return -1;
2100 2101 2102 2103 2104
    }

    spec.fwdType = MIGRATION_FWD_STREAM;
    spec.fwd.stream = st;

2105 2106 2107 2108 2109 2110 2111
    if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD)) {
        int fds[2];

        spec.destType = MIGRATION_DEST_FD;
        spec.dest.fd.qemu = -1;
        spec.dest.fd.local = -1;

2112
        if (pipe2(fds, O_CLOEXEC) == 0) {
2113 2114 2115 2116
            spec.dest.fd.qemu = fds[1];
            spec.dest.fd.local = fds[0];
        }
        if (spec.dest.fd.qemu == -1 ||
2117
            virSecurityManagerSetImageFDLabel(driver->securityManager, vm->def,
2118
                                              spec.dest.fd.qemu) < 0) {
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
            virReportSystemError(errno, "%s",
                        _("cannot create pipe for tunnelled migration"));
            goto cleanup;
        }
    } else {
        spec.destType = MIGRATION_DEST_UNIX;
        spec.dest.unix_socket.sock = -1;
        spec.dest.unix_socket.file = NULL;

        if (virAsprintf(&spec.dest.unix_socket.file,
                        "%s/qemu.tunnelmigrate.src.%s",
                        driver->libDir, vm->def->name) < 0) {
            virReportOOMError();
            goto cleanup;
        }

        if (virNetSocketNewListenUNIX(spec.dest.unix_socket.file, 0700,
                                      driver->user, driver->group,
                                      &sock) < 0 ||
            virNetSocketListen(sock, 1) < 0)
            goto cleanup;

        spec.dest.unix_socket.sock = virNetSocketGetFD(sock);
    }

2144
    ret = qemuMigrationRun(driver, vm, cookiein, cookieinlen, cookieout,
2145
                           cookieoutlen, flags, resource, &spec, dconn);
2146

2147
cleanup:
2148 2149 2150 2151 2152 2153 2154
    if (spec.destType == MIGRATION_DEST_FD) {
        VIR_FORCE_CLOSE(spec.dest.fd.qemu);
        VIR_FORCE_CLOSE(spec.dest.fd.local);
    } else {
        virNetSocketFree(sock);
        VIR_FREE(spec.dest.unix_socket.file);
    }
2155 2156 2157 2158 2159

    return ret;
}


2160 2161 2162 2163 2164
/* This is essentially a re-impl of virDomainMigrateVersion2
 * from libvirt.c, but running in source libvirtd context,
 * instead of client app context & also adding in tunnel
 * handling */
static int doPeer2PeerMigrate2(struct qemud_driver *driver,
2165
                               virConnectPtr sconn ATTRIBUTE_UNUSED,
2166 2167
                               virConnectPtr dconn,
                               virDomainObjPtr vm,
2168
                               const char *dconnuri,
2169 2170 2171
                               unsigned long flags,
                               const char *dname,
                               unsigned long resource)
2172 2173 2174
{
    virDomainPtr ddomain = NULL;
    char *uri_out = NULL;
2175
    char *cookie = NULL;
2176 2177 2178 2179 2180
    char *dom_xml = NULL;
    int cookielen = 0, ret;
    virErrorPtr orig_err = NULL;
    int cancelled;
    virStreamPtr st = NULL;
2181
    VIR_DEBUG("driver=%p, sconn=%p, dconn=%p, vm=%p, dconnuri=%s, "
2182
              "flags=%lx, dname=%s, resource=%lu",
2183 2184
              driver, sconn, dconn, vm, NULLSTR(dconnuri),
              flags, NULLSTR(dname), resource);
2185

2186 2187 2188 2189 2190 2191
    /* In version 2 of the protocol, the prepare step is slightly
     * different.  We fetch the domain XML of the source domain
     * and pass it to Prepare2.
     */
    if (!(dom_xml = qemuDomainFormatXML(driver, vm,
                                        VIR_DOMAIN_XML_SECURE |
2192 2193
                                        VIR_DOMAIN_XML_UPDATE_CPU,
                                        true)))
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221
        return -1;

    if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED)
        flags |= VIR_MIGRATE_PAUSED;

    VIR_DEBUG("Prepare2 %p", dconn);
    if (flags & VIR_MIGRATE_TUNNELLED) {
        /*
         * Tunnelled Migrate Version 2 does not support cookies
         * due to missing parameters in the prepareTunnel() API.
         */

        if (!(st = virStreamNew(dconn, 0)))
            goto cleanup;

        qemuDomainObjEnterRemoteWithDriver(driver, vm);
        ret = dconn->driver->domainMigratePrepareTunnel
            (dconn, st, flags, dname, resource, dom_xml);
        qemuDomainObjExitRemoteWithDriver(driver, vm);
    } else {
        qemuDomainObjEnterRemoteWithDriver(driver, vm);
        ret = dconn->driver->domainMigratePrepare2
            (dconn, &cookie, &cookielen, NULL, &uri_out,
             flags, dname, resource, dom_xml);
        qemuDomainObjExitRemoteWithDriver(driver, vm);
    }
    VIR_FREE(dom_xml);
    if (ret == -1)
2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232
        goto cleanup;

    /* the domain may have shutdown or crashed while we had the locks dropped
     * in qemuDomainObjEnterRemoteWithDriver, so check again
     */
    if (!virDomainObjIsActive(vm)) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("guest unexpectedly quit"));
        goto cleanup;
    }

2233 2234 2235
    if (!(flags & VIR_MIGRATE_TUNNELLED) &&
        (uri_out == NULL)) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
2236
                        _("domainMigratePrepare2 did not set uri"));
2237 2238
        cancelled = 1;
        goto finish;
2239 2240
    }

2241 2242 2243 2244
    /* Perform the migration.  The driver isn't supposed to return
     * until the migration is complete.
     */
    VIR_DEBUG("Perform %p", sconn);
2245
    qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_PERFORM2);
2246
    if (flags & VIR_MIGRATE_TUNNELLED)
2247 2248
        ret = doTunnelMigrate(driver, vm, st,
                              NULL, 0, NULL, NULL,
2249
                              flags, resource, dconn);
2250 2251 2252 2253
    else
        ret = doNativeMigrate(driver, vm, uri_out,
                              cookie, cookielen,
                              NULL, NULL, /* No out cookie with v2 migration */
2254
                              flags, resource, dconn);
2255 2256 2257 2258

    /* Perform failed. Make sure Finish doesn't overwrite the error */
    if (ret < 0)
        orig_err = virSaveLastError();
2259

2260 2261 2262 2263
    /* If Perform returns < 0, then we need to cancel the VM
     * startup on the destination
     */
    cancelled = ret < 0 ? 1 : 0;
2264 2265

finish:
2266 2267 2268 2269
    /* In version 2 of the migration protocol, we pass the
     * status code from the sender to the destination host,
     * so it can do any cleanup if the migration failed.
     */
2270
    dname = dname ? dname : vm->def->name;
2271
    VIR_DEBUG("Finish2 %p ret=%d", dconn, ret);
2272 2273
    qemuDomainObjEnterRemoteWithDriver(driver, vm);
    ddomain = dconn->driver->domainMigrateFinish2
2274
        (dconn, dname, cookie, cookielen,
2275
         uri_out ? uri_out : dconnuri, flags, cancelled);
2276 2277
    qemuDomainObjExitRemoteWithDriver(driver, vm);

2278 2279
cleanup:
    if (ddomain) {
2280
        virUnrefDomain(ddomain);
2281 2282 2283 2284
        ret = 0;
    } else {
        ret = -1;
    }
2285

2286 2287 2288 2289 2290 2291 2292 2293
    if (st)
        virUnrefStream(st);

    if (orig_err) {
        virSetError(orig_err);
        virFreeError(orig_err);
    }
    VIR_FREE(uri_out);
2294
    VIR_FREE(cookie);
2295 2296

    return ret;
2297 2298 2299
}


2300 2301 2302 2303 2304 2305 2306 2307
/* This is essentially a re-impl of virDomainMigrateVersion3
 * from libvirt.c, but running in source libvirtd context,
 * instead of client app context & also adding in tunnel
 * handling */
static int doPeer2PeerMigrate3(struct qemud_driver *driver,
                               virConnectPtr sconn,
                               virConnectPtr dconn,
                               virDomainObjPtr vm,
2308
                               const char *xmlin,
2309
                               const char *dconnuri,
2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325
                               const char *uri,
                               unsigned long flags,
                               const char *dname,
                               unsigned long resource)
{
    virDomainPtr ddomain = NULL;
    char *uri_out = NULL;
    char *cookiein = NULL;
    char *cookieout = NULL;
    char *dom_xml = NULL;
    int cookieinlen = 0;
    int cookieoutlen = 0;
    int ret = -1;
    virErrorPtr orig_err = NULL;
    int cancelled;
    virStreamPtr st = NULL;
2326
    VIR_DEBUG("driver=%p, sconn=%p, dconn=%p, vm=%p, xmlin=%s, "
2327
              "dconnuri=%s, uri=%s, flags=%lx, dname=%s, resource=%lu",
2328 2329 2330
              driver, sconn, dconn, vm, NULLSTR(xmlin),
              NULLSTR(dconnuri), NULLSTR(uri), flags,
              NULLSTR(dname), resource);
2331

2332 2333 2334 2335 2336
    /* Unlike the virDomainMigrateVersion3 counterpart, we don't need
     * to worry about auto-setting the VIR_MIGRATE_CHANGE_PROTECTION
     * bit here, because we are already running inside the context of
     * a single job.  */

2337
    dom_xml = qemuMigrationBegin(driver, vm, xmlin, dname,
2338
                                 &cookieout, &cookieoutlen, flags);
2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363
    if (!dom_xml)
        goto cleanup;

    if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED)
        flags |= VIR_MIGRATE_PAUSED;

    VIR_DEBUG("Prepare3 %p", dconn);
    cookiein = cookieout;
    cookieinlen = cookieoutlen;
    cookieout = NULL;
    cookieoutlen = 0;
    if (flags & VIR_MIGRATE_TUNNELLED) {
        if (!(st = virStreamNew(dconn, 0)))
            goto cleanup;

        qemuDomainObjEnterRemoteWithDriver(driver, vm);
        ret = dconn->driver->domainMigratePrepareTunnel3
            (dconn, st, cookiein, cookieinlen,
             &cookieout, &cookieoutlen,
             flags, dname, resource, dom_xml);
        qemuDomainObjExitRemoteWithDriver(driver, vm);
    } else {
        qemuDomainObjEnterRemoteWithDriver(driver, vm);
        ret = dconn->driver->domainMigratePrepare3
            (dconn, cookiein, cookieinlen, &cookieout, &cookieoutlen,
2364
             uri, &uri_out, flags, dname, resource, dom_xml);
2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
        qemuDomainObjExitRemoteWithDriver(driver, vm);
    }
    VIR_FREE(dom_xml);
    if (ret == -1)
        goto cleanup;

    if (!(flags & VIR_MIGRATE_TUNNELLED) &&
        (uri_out == NULL)) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR,
                        _("domainMigratePrepare3 did not set uri"));
        cancelled = 1;
        goto finish;
    }

    /* Perform the migration.  The driver isn't supposed to return
     * until the migration is complete. The src VM should remain
     * running, but in paused state until the destination can
     * confirm migration completion.
     */
2384
    VIR_DEBUG("Perform3 %p uri=%s uri_out=%s", sconn, uri, uri_out);
2385
    qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_PERFORM3);
2386 2387 2388 2389 2390 2391 2392 2393 2394
    VIR_FREE(cookiein);
    cookiein = cookieout;
    cookieinlen = cookieoutlen;
    cookieout = NULL;
    cookieoutlen = 0;
    if (flags & VIR_MIGRATE_TUNNELLED)
        ret = doTunnelMigrate(driver, vm, st,
                              cookiein, cookieinlen,
                              &cookieout, &cookieoutlen,
2395
                              flags, resource, dconn);
2396 2397 2398 2399
    else
        ret = doNativeMigrate(driver, vm, uri_out,
                              cookiein, cookieinlen,
                              &cookieout, &cookieoutlen,
2400
                              flags, resource, dconn);
2401 2402

    /* Perform failed. Make sure Finish doesn't overwrite the error */
2403
    if (ret < 0) {
2404
        orig_err = virSaveLastError();
2405 2406 2407 2408
    } else {
        qemuMigrationJobSetPhase(driver, vm,
                                 QEMU_MIGRATION_PHASE_PERFORM3_DONE);
    }
2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429

    /* If Perform returns < 0, then we need to cancel the VM
     * startup on the destination
     */
    cancelled = ret < 0 ? 1 : 0;

finish:
    /*
     * The status code from the source is passed to the destination.
     * The dest can cleanup in the source indicated it failed to
     * send all migration data. Returns NULL for ddomain if
     * the dest was unable to complete migration.
     */
    VIR_DEBUG("Finish3 %p ret=%d", dconn, ret);
    VIR_FREE(cookiein);
    cookiein = cookieout;
    cookieinlen = cookieoutlen;
    cookieout = NULL;
    cookieoutlen = 0;
    dname = dname ? dname : vm->def->name;
    qemuDomainObjEnterRemoteWithDriver(driver, vm);
2430
    ddomain = dconn->driver->domainMigrateFinish3
2431
        (dconn, dname, cookiein, cookieinlen, &cookieout, &cookieoutlen,
2432
         dconnuri, uri_out ? uri_out : uri, flags, cancelled);
2433 2434
    qemuDomainObjExitRemoteWithDriver(driver, vm);

2435 2436 2437 2438 2439 2440 2441
    /* If ddomain is NULL, then we were unable to start
     * the guest on the target, and must restart on the
     * source. There is a small chance that the ddomain
     * is NULL due to an RPC failure, in which case
     * ddomain could in fact be running on the dest.
     * The lock manager plugins should take care of
     * safety in this scenario.
2442
     */
2443
    cancelled = ddomain == NULL ? 1 : 0;
2444

2445 2446 2447 2448 2449 2450
    /* If finish3 set an error, and we don't have an earlier
     * one we need to preserve it in case confirm3 overwrites
     */
    if (!orig_err)
        orig_err = virSaveLastError();

2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462
    /*
     * If cancelled, then src VM will be restarted, else
     * it will be killed
     */
    VIR_DEBUG("Confirm3 %p ret=%d vm=%p", sconn, ret, vm);
    VIR_FREE(cookiein);
    cookiein = cookieout;
    cookieinlen = cookieoutlen;
    cookieout = NULL;
    cookieoutlen = 0;
    ret = qemuMigrationConfirm(driver, sconn, vm,
                               cookiein, cookieinlen,
2463
                               flags, cancelled);
2464 2465 2466 2467
    /* If Confirm3 returns -1, there's nothing more we can
     * do, but fortunately worst case is that there is a
     * domain left in 'paused' state on source.
     */
2468 2469 2470
    if (ret < 0)
        VIR_WARN("Guest %s probably left in 'paused' state on source",
                 vm->def->name);
2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494

 cleanup:
    if (ddomain) {
        virUnrefDomain(ddomain);
        ret = 0;
    } else {
        ret = -1;
    }

    if (st)
        virUnrefStream(st);

    if (orig_err) {
        virSetError(orig_err);
        virFreeError(orig_err);
    }
    VIR_FREE(uri_out);
    VIR_FREE(cookiein);
    VIR_FREE(cookieout);

    return ret;
}


2495
static int doPeer2PeerMigrate(struct qemud_driver *driver,
2496
                              virConnectPtr sconn,
2497
                              virDomainObjPtr vm,
2498
                              const char *xmlin,
2499
                              const char *dconnuri,
2500 2501 2502
                              const char *uri,
                              unsigned long flags,
                              const char *dname,
2503 2504
                              unsigned long resource,
                              bool *v3proto)
2505 2506 2507 2508
{
    int ret = -1;
    virConnectPtr dconn = NULL;
    bool p2p;
2509 2510
    virErrorPtr orig_err = NULL;

2511
    VIR_DEBUG("driver=%p, sconn=%p, vm=%p, xmlin=%s, dconnuri=%s, "
2512
              "uri=%s, flags=%lx, dname=%s, resource=%lu",
2513 2514
              driver, sconn, vm, NULLSTR(xmlin), NULLSTR(dconnuri),
              NULLSTR(uri), flags, NULLSTR(dname), resource);
2515 2516 2517 2518 2519 2520

    /* the order of operations is important here; we make sure the
     * destination side is completely setup before we touch the source
     */

    qemuDomainObjEnterRemoteWithDriver(driver, vm);
2521
    dconn = virConnectOpen(dconnuri);
2522 2523 2524
    qemuDomainObjExitRemoteWithDriver(driver, vm);
    if (dconn == NULL) {
        qemuReportError(VIR_ERR_OPERATION_FAILED,
2525
                        _("Failed to connect to remote libvirt URI %s"), dconnuri);
2526 2527 2528
        return -1;
    }

2529 2530 2531 2532
    if (virConnectSetKeepAlive(dconn, driver->keepAliveInterval,
                               driver->keepAliveCount) < 0)
        goto cleanup;

2533 2534 2535
    qemuDomainObjEnterRemoteWithDriver(driver, vm);
    p2p = VIR_DRV_SUPPORTS_FEATURE(dconn->driver, dconn,
                                   VIR_DRV_FEATURE_MIGRATION_P2P);
2536
        /* v3proto reflects whether the caller used Perform3, but with
2537
         * p2p migrate, regardless of whether Perform2 or Perform3
2538 2539 2540 2541
         * were used, we decide protocol based on what target supports
         */
    *v3proto = VIR_DRV_SUPPORTS_FEATURE(dconn->driver, dconn,
                                        VIR_DRV_FEATURE_MIGRATION_V3);
2542
    qemuDomainObjExitRemoteWithDriver(driver, vm);
2543

2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556
    if (!p2p) {
        qemuReportError(VIR_ERR_OPERATION_FAILED, "%s",
                        _("Destination libvirt does not support peer-to-peer migration protocol"));
        goto cleanup;
    }

    /* domain may have been stopped while we were talking to remote daemon */
    if (!virDomainObjIsActive(vm)) {
        qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("guest unexpectedly quit"));
        goto cleanup;
    }

2557 2558 2559 2560 2561 2562 2563
    /* Change protection is only required on the source side (us), and
     * only for v3 migration when begin and perform are separate jobs.
     * But peer-2-peer is already a single job, and we still want to
     * talk to older destinations that would reject the flag.
     * Therefore it is safe to clear the bit here.  */
    flags &= ~VIR_MIGRATE_CHANGE_PROTECTION;

2564
    if (*v3proto)
2565
        ret = doPeer2PeerMigrate3(driver, sconn, dconn, vm, xmlin,
2566
                                  dconnuri, uri, flags, dname, resource);
2567 2568
    else
        ret = doPeer2PeerMigrate2(driver, sconn, dconn, vm,
2569
                                  dconnuri, flags, dname, resource);
2570 2571

cleanup:
2572
    orig_err = virSaveLastError();
2573
    qemuDomainObjEnterRemoteWithDriver(driver, vm);
2574
    virConnectClose(dconn);
2575
    qemuDomainObjExitRemoteWithDriver(driver, vm);
2576 2577 2578 2579
    if (orig_err) {
        virSetError(orig_err);
        virFreeError(orig_err);
    }
2580 2581 2582 2583 2584

    return ret;
}


2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604
/*
 * This implements perform part of the migration protocol when migration job
 * does not need to be active across several APIs, i.e., peer2peer migration or
 * perform phase of v2 non-peer2peer migration.
 */
static int
qemuMigrationPerformJob(struct qemud_driver *driver,
                        virConnectPtr conn,
                        virDomainObjPtr vm,
                        const char *xmlin,
                        const char *dconnuri,
                        const char *uri,
                        const char *cookiein,
                        int cookieinlen,
                        char **cookieout,
                        int *cookieoutlen,
                        unsigned long flags,
                        const char *dname,
                        unsigned long resource,
                        bool v3proto)
2605 2606 2607 2608
{
    virDomainEventPtr event = NULL;
    int ret = -1;
    int resume = 0;
2609
    virErrorPtr orig_err = NULL;
2610

2611
    if (qemuMigrationJobStart(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
2612 2613 2614 2615 2616 2617 2618 2619
        goto cleanup;

    if (!virDomainObjIsActive(vm)) {
        qemuReportError(VIR_ERR_OPERATION_INVALID,
                        "%s", _("domain is not running"));
        goto endjob;
    }

2620 2621
    if (!qemuMigrationIsAllowed(driver, vm, NULL))
        goto cleanup;
2622

2623 2624 2625
    if (!(flags & VIR_MIGRATE_UNSAFE) && !qemuMigrationIsSafe(vm->def))
        goto cleanup;

J
Jiri Denemark 已提交
2626
    resume = virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING;
2627 2628

    if ((flags & (VIR_MIGRATE_TUNNELLED | VIR_MIGRATE_PEER2PEER))) {
2629 2630 2631
        ret = doPeer2PeerMigrate(driver, conn, vm, xmlin,
                                 dconnuri, uri, flags, dname,
                                 resource, &v3proto);
2632
    } else {
2633 2634 2635
        qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_PERFORM2);
        ret = doNativeMigrate(driver, vm, uri, cookiein, cookieinlen,
                              cookieout, cookieoutlen,
2636
                              flags, resource, NULL);
2637
    }
2638 2639
    if (ret < 0)
        goto endjob;
2640

2641 2642 2643 2644
    /*
     * In v3 protocol, the source VM is not killed off until the
     * confirm step.
     */
2645
    if (!v3proto) {
2646
        qemuProcessStop(driver, vm, 1, VIR_DOMAIN_SHUTOFF_MIGRATED);
2647
        virDomainAuditStop(vm, "migrated");
2648 2649 2650
        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_STOPPED,
                                         VIR_DOMAIN_EVENT_STOPPED_MIGRATED);
2651
    }
2652
    resume = 0;
2653 2654

endjob:
2655 2656 2657
    if (ret < 0)
        orig_err = virSaveLastError();

J
Jiri Denemark 已提交
2658
    if (resume && virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED) {
2659
        /* we got here through some sort of failure; start the domain again */
J
Jiri Denemark 已提交
2660
        if (qemuProcessStartCPUs(driver, vm, conn,
2661 2662
                                 VIR_DOMAIN_RUNNING_MIGRATION_CANCELED,
                                 QEMU_ASYNC_JOB_MIGRATION_OUT) < 0) {
2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674
            /* Hm, we already know we are in error here.  We don't want to
             * overwrite the previous error, though, so we just throw something
             * to the logs and hope for the best
             */
            VIR_ERROR(_("Failed to resume guest %s after failure"),
                      vm->def->name);
        }

        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_RESUMED,
                                         VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
    }
2675 2676 2677 2678 2679 2680 2681 2682

    if (qemuMigrationJobFinish(driver, vm) == 0) {
        vm = NULL;
    } else if (!virDomainObjIsActive(vm) &&
               (!vm->persistent ||
                (ret == 0 && (flags & VIR_MIGRATE_UNDEFINE_SOURCE)))) {
        if (flags & VIR_MIGRATE_UNDEFINE_SOURCE)
            virDomainDeleteConfig(driver->configDir, driver->autostartDir, vm);
2683
        qemuDomainRemoveInactive(driver, vm);
2684 2685 2686
        vm = NULL;
    }

2687 2688 2689 2690 2691
    if (orig_err) {
        virSetError(orig_err);
        virFreeError(orig_err);
    }

2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728
cleanup:
    if (vm)
        virDomainObjUnlock(vm);
    if (event)
        qemuDomainEventQueue(driver, event);
    return ret;
}

/*
 * This implements perform phase of v3 migration protocol.
 */
static int
qemuMigrationPerformPhase(struct qemud_driver *driver,
                          virConnectPtr conn,
                          virDomainObjPtr vm,
                          const char *uri,
                          const char *cookiein,
                          int cookieinlen,
                          char **cookieout,
                          int *cookieoutlen,
                          unsigned long flags,
                          unsigned long resource)
{
    virDomainEventPtr event = NULL;
    int ret = -1;
    bool resume;
    int refs;

    /* If we didn't start the job in the begin phase, start it now. */
    if (!(flags & VIR_MIGRATE_CHANGE_PROTECTION)) {
        if (qemuMigrationJobStart(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT) < 0)
            goto cleanup;
    } else if (!qemuMigrationJobIsActive(vm, QEMU_ASYNC_JOB_MIGRATION_OUT)) {
        goto cleanup;
    }

    qemuMigrationJobStartPhase(driver, vm, QEMU_MIGRATION_PHASE_PERFORM3);
2729
    qemuDriverCloseCallbackUnset(driver, vm, qemuMigrationCleanup);
2730 2731 2732 2733

    resume = virDomainObjGetState(vm, NULL) == VIR_DOMAIN_RUNNING;
    ret = doNativeMigrate(driver, vm, uri, cookiein, cookieinlen,
                          cookieout, cookieoutlen,
2734
                          flags, resource, NULL);
2735 2736 2737 2738 2739

    if (ret < 0 && resume &&
        virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED) {
        /* we got here through some sort of failure; start the domain again */
        if (qemuProcessStartCPUs(driver, vm, conn,
2740 2741
                                 VIR_DOMAIN_RUNNING_MIGRATION_CANCELED,
                                 QEMU_ASYNC_JOB_MIGRATION_OUT) < 0) {
2742 2743 2744 2745 2746 2747
            /* Hm, we already know we are in error here.  We don't want to
             * overwrite the previous error, though, so we just throw something
             * to the logs and hope for the best
             */
            VIR_ERROR(_("Failed to resume guest %s after failure"),
                      vm->def->name);
2748
        }
2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759

        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_RESUMED,
                                         VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
    }

    if (ret < 0)
        goto endjob;

    qemuMigrationJobSetPhase(driver, vm, QEMU_MIGRATION_PHASE_PERFORM3_DONE);

2760 2761 2762 2763
    if (qemuDriverCloseCallbackSet(driver, vm, conn,
                                   qemuMigrationCleanup) < 0)
        goto endjob;

2764 2765 2766 2767 2768 2769 2770 2771
endjob:
    if (ret < 0)
        refs = qemuMigrationJobFinish(driver, vm);
    else
        refs = qemuMigrationJobContinue(vm);
    if (refs == 0) {
        vm = NULL;
    } else if (!virDomainObjIsActive(vm) && !vm->persistent) {
2772
        qemuDomainRemoveInactive(driver, vm);
2773
        vm = NULL;
2774
    }
2775 2776 2777 2778 2779 2780 2781 2782 2783

cleanup:
    if (vm)
        virDomainObjUnlock(vm);
    if (event)
        qemuDomainEventQueue(driver, event);
    return ret;
}

2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829
int
qemuMigrationPerform(struct qemud_driver *driver,
                     virConnectPtr conn,
                     virDomainObjPtr vm,
                     const char *xmlin,
                     const char *dconnuri,
                     const char *uri,
                     const char *cookiein,
                     int cookieinlen,
                     char **cookieout,
                     int *cookieoutlen,
                     unsigned long flags,
                     const char *dname,
                     unsigned long resource,
                     bool v3proto)
{
    VIR_DEBUG("driver=%p, conn=%p, vm=%p, xmlin=%s, dconnuri=%s, "
              "uri=%s, cookiein=%s, cookieinlen=%d, cookieout=%p, "
              "cookieoutlen=%p, flags=%lx, dname=%s, resource=%lu, v3proto=%d",
              driver, conn, vm, NULLSTR(xmlin), NULLSTR(dconnuri),
              NULLSTR(uri), NULLSTR(cookiein), cookieinlen,
              cookieout, cookieoutlen, flags, NULLSTR(dname),
              resource, v3proto);

    if ((flags & (VIR_MIGRATE_TUNNELLED | VIR_MIGRATE_PEER2PEER))) {
        if (cookieinlen) {
            qemuReportError(VIR_ERR_OPERATION_INVALID,
                            "%s", _("received unexpected cookie with P2P migration"));
            return -1;
        }

        return qemuMigrationPerformJob(driver, conn, vm, xmlin, dconnuri, uri,
                                       cookiein, cookieinlen, cookieout,
                                       cookieoutlen, flags, dname, resource,
                                       v3proto);
    } else {
        if (dconnuri) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR,
                            "%s", _("Unexpected dconnuri parameter with non-peer2peer migration"));
            return -1;
        }

        if (v3proto) {
            return qemuMigrationPerformPhase(driver, conn, vm, uri,
                                             cookiein, cookieinlen,
                                             cookieout, cookieoutlen,
2830
                                             flags, resource);
2831 2832 2833 2834 2835 2836 2837 2838
        } else {
            return qemuMigrationPerformJob(driver, conn, vm, xmlin, dconnuri,
                                           uri, cookiein, cookieinlen,
                                           cookieout, cookieoutlen, flags,
                                           dname, resource, v3proto);
        }
    }
}
2839

2840
static int
2841 2842 2843 2844 2845 2846 2847
qemuMigrationVPAssociatePortProfiles(virDomainDefPtr def) {
    int i;
    int last_good_net = -1;
    virDomainNetDefPtr net;

    for (i = 0; i < def->nnets; i++) {
        net = def->nets[i];
2848
        if (virDomainNetGetActualType(net) == VIR_DOMAIN_NET_TYPE_DIRECT) {
2849
            if (virNetDevVPortProfileAssociate(net->ifname,
2850
                                               virDomainNetGetActualVirtPortProfile(net),
2851 2852
                                               net->mac,
                                               virDomainNetGetActualDirectDev(net),
2853
                                               -1,
2854
                                               def->uuid,
2855 2856 2857 2858 2859
                                               VIR_NETDEV_VPORT_PROFILE_OP_MIGRATE_IN_FINISH,
                                               false) < 0) {
                qemuReportError(VIR_ERR_OPERATION_FAILED,
                                _("Port profile Associate failed for %s"),
                                net->ifname);
2860
                goto err_exit;
2861 2862
            }
            VIR_DEBUG("Port profile Associate succeeded for %s", net->ifname);
2863 2864 2865 2866 2867 2868

            if (virNetDevMacVLanVPortProfileRegisterCallback(net->ifname, net->mac,
                                                             virDomainNetGetActualDirectDev(net), def->uuid,
                                                             virDomainNetGetActualVirtPortProfile(net),
                                                             VIR_NETDEV_VPORT_PROFILE_OP_CREATE))
                goto err_exit;
2869 2870 2871 2872
        }
        last_good_net = i;
    }

2873
    return 0;
2874 2875 2876 2877

err_exit:
    for (i = 0; i < last_good_net; i++) {
        net = def->nets[i];
2878
        if (virDomainNetGetActualType(net) == VIR_DOMAIN_NET_TYPE_DIRECT) {
2879
            ignore_value(virNetDevVPortProfileDisassociate(net->ifname,
2880
                                                           virDomainNetGetActualVirtPortProfile(net),
2881 2882
                                                           net->mac,
                                                           virDomainNetGetActualDirectDev(net),
2883
                                                           -1,
2884
                                                           VIR_NETDEV_VPORT_PROFILE_OP_MIGRATE_IN_FINISH));
2885 2886
        }
    }
2887
    return -1;
2888 2889 2890 2891 2892 2893 2894
}


virDomainPtr
qemuMigrationFinish(struct qemud_driver *driver,
                    virConnectPtr dconn,
                    virDomainObjPtr vm,
2895 2896 2897 2898
                    const char *cookiein,
                    int cookieinlen,
                    char **cookieout,
                    int *cookieoutlen,
2899
                    unsigned long flags,
2900 2901
                    int retcode,
                    bool v3proto)
2902 2903 2904 2905
{
    virDomainPtr dom = NULL;
    virDomainEventPtr event = NULL;
    int newVM = 1;
2906
    qemuMigrationCookiePtr mig = NULL;
2907
    virErrorPtr orig_err = NULL;
2908
    int cookie_flags = 0;
J
Jiri Denemark 已提交
2909
    qemuDomainObjPrivatePtr priv = vm->privateData;
2910

2911
    VIR_DEBUG("driver=%p, dconn=%p, vm=%p, cookiein=%s, cookieinlen=%d, "
2912
              "cookieout=%p, cookieoutlen=%p, flags=%lx, retcode=%d",
2913 2914
              driver, dconn, vm, NULLSTR(cookiein), cookieinlen,
              cookieout, cookieoutlen, flags, retcode);
2915

2916
    if (!qemuMigrationJobIsActive(vm, QEMU_ASYNC_JOB_MIGRATION_IN))
2917 2918
        goto cleanup;

2919 2920 2921
    qemuMigrationJobStartPhase(driver, vm,
                               v3proto ? QEMU_MIGRATION_PHASE_FINISH3
                                       : QEMU_MIGRATION_PHASE_FINISH2);
2922

2923 2924
    qemuDomainCleanupRemove(vm, qemuMigrationPrepareCleanup);

2925 2926 2927 2928 2929
    if (flags & VIR_MIGRATE_PERSIST_DEST)
        cookie_flags |= QEMU_MIGRATION_COOKIE_PERSISTENT;

    if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein,
                                       cookieinlen, cookie_flags)))
2930
        goto endjob;
2931 2932 2933 2934 2935 2936 2937 2938

    /* Did the migration go as planned?  If yes, return the domain
     * object, but if no, clean up the empty qemu process.
     */
    if (retcode == 0) {
        if (!virDomainObjIsActive(vm)) {
            qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                            _("guest unexpectedly quit"));
2939
            goto endjob;
2940 2941
        }

2942 2943 2944 2945 2946 2947 2948 2949
        if (qemuMigrationVPAssociatePortProfiles(vm->def) < 0) {
            qemuProcessStop(driver, vm, 1, VIR_DOMAIN_SHUTOFF_FAILED);
            virDomainAuditStop(vm, "failed");
            event = virDomainEventNewFromObj(vm,
                                             VIR_DOMAIN_EVENT_STOPPED,
                                             VIR_DOMAIN_EVENT_STOPPED_FAILED);
            goto endjob;
        }
2950 2951

        if (flags & VIR_MIGRATE_PERSIST_DEST) {
2952
            virDomainDefPtr vmdef;
2953 2954 2955
            if (vm->persistent)
                newVM = 0;
            vm->persistent = 1;
2956 2957 2958 2959
            if (mig->persistent)
                vm->newDef = vmdef = mig->persistent;
            else
                vmdef = virDomainObjGetPersistentDef(driver->caps, vm);
A
Alex Jia 已提交
2960
            if (!vmdef || virDomainSaveConfig(driver->configDir, vmdef) < 0) {
2961 2962 2963 2964 2965 2966 2967 2968 2969
                /* Hmpf.  Migration was successful, but making it persistent
                 * was not.  If we report successful, then when this domain
                 * shuts down, management tools are in for a surprise.  On the
                 * other hand, if we report failure, then the management tools
                 * might try to restart the domain on the source side, even
                 * though the domain is actually running on the destination.
                 * Return a NULL dom pointer, and hope that this is a rare
                 * situation and management tools are smart.
                 */
2970 2971

                /*
2972 2973
                 * However, in v3 protocol, the source VM is still available
                 * to restart during confirm() step, so we kill it off now.
2974 2975 2976
                 */
                if (v3proto) {
                    qemuProcessStop(driver, vm, 1, VIR_DOMAIN_SHUTOFF_FAILED);
2977
                    virDomainAuditStop(vm, "failed");
2978 2979
                    if (newVM)
                        vm->persistent = 0;
2980
                }
A
Alex Jia 已提交
2981 2982 2983
                if (!vmdef)
                    qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                    _("can't get vmdef"));
2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001
                goto endjob;
            }

            event = virDomainEventNewFromObj(vm,
                                             VIR_DOMAIN_EVENT_DEFINED,
                                             newVM ?
                                             VIR_DOMAIN_EVENT_DEFINED_ADDED :
                                             VIR_DOMAIN_EVENT_DEFINED_UPDATED);
            if (event)
                qemuDomainEventQueue(driver, event);
            event = NULL;
        }

        if (!(flags & VIR_MIGRATE_PAUSED)) {
            /* run 'cont' on the destination, which allows migration on qemu
             * >= 0.10.6 to work properly.  This isn't strictly necessary on
             * older qemu's, but it also doesn't hurt anything there
             */
J
Jiri Denemark 已提交
3002
            if (qemuProcessStartCPUs(driver, vm, dconn,
3003 3004
                                     VIR_DOMAIN_RUNNING_MIGRATED,
                                     QEMU_ASYNC_JOB_MIGRATION_IN) < 0) {
3005 3006 3007 3008 3009 3010 3011 3012
                if (virGetLastError() == NULL)
                    qemuReportError(VIR_ERR_INTERNAL_ERROR,
                                    "%s", _("resume operation failed"));
                /* Need to save the current error, in case shutting
                 * down the process overwrites it
                 */
                orig_err = virSaveLastError();

3013 3014 3015 3016 3017 3018 3019 3020 3021 3022
                /*
                 * In v3 protocol, the source VM is still available to
                 * restart during confirm() step, so we kill it off
                 * now.
                 * In v2 protocol, the source is dead, so we leave
                 * target in paused state, in case admin can fix
                 * things up
                 */
                if (v3proto) {
                    qemuProcessStop(driver, vm, 1, VIR_DOMAIN_SHUTOFF_FAILED);
3023
                    virDomainAuditStop(vm, "failed");
3024 3025 3026 3027
                    event = virDomainEventNewFromObj(vm,
                                                     VIR_DOMAIN_EVENT_STOPPED,
                                                     VIR_DOMAIN_EVENT_STOPPED_FAILED);
                }
3028 3029 3030 3031
                goto endjob;
            }
        }

3032 3033
        dom = virGetDomain (dconn, vm->def->name, vm->def->uuid);

3034 3035 3036
        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_RESUMED,
                                         VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
J
Jiri Denemark 已提交
3037 3038
        if (virDomainObjGetState(vm, NULL) == VIR_DOMAIN_PAUSED) {
            virDomainObjSetState(vm, VIR_DOMAIN_PAUSED, VIR_DOMAIN_PAUSED_USER);
3039 3040
            if (event)
                qemuDomainEventQueue(driver, event);
3041 3042 3043 3044 3045 3046 3047 3048
            event = virDomainEventNewFromObj(vm,
                                             VIR_DOMAIN_EVENT_SUSPENDED,
                                             VIR_DOMAIN_EVENT_SUSPENDED_PAUSED);
        }
        if (virDomainSaveStatus(driver->caps, driver->stateDir, vm) < 0) {
            VIR_WARN("Failed to save status on vm %s", vm->def->name);
            goto endjob;
        }
3049 3050 3051

        /* Guest is successfully running, so cancel previous auto destroy */
        qemuProcessAutoDestroyRemove(driver, vm);
3052
    } else {
J
Jiri Denemark 已提交
3053
        qemuProcessStop(driver, vm, 1, VIR_DOMAIN_SHUTOFF_FAILED);
3054
        virDomainAuditStop(vm, "failed");
3055 3056 3057 3058 3059
        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_STOPPED,
                                         VIR_DOMAIN_EVENT_STOPPED_FAILED);
    }

3060 3061 3062
    if (qemuMigrationBakeCookie(mig, driver, vm, cookieout, cookieoutlen, 0) < 0)
        VIR_WARN("Unable to encode migration cookie");

3063
endjob:
E
Eric Blake 已提交
3064 3065 3066
    if (qemuMigrationJobFinish(driver, vm) == 0) {
        vm = NULL;
    } else if (!vm->persistent && !virDomainObjIsActive(vm)) {
3067
        qemuDomainRemoveInactive(driver, vm);
E
Eric Blake 已提交
3068
        vm = NULL;
3069
    }
3070 3071

cleanup:
J
Jiri Denemark 已提交
3072 3073
    if (vm) {
        VIR_FREE(priv->origname);
3074
        virDomainObjUnlock(vm);
J
Jiri Denemark 已提交
3075
    }
3076 3077
    if (event)
        qemuDomainEventQueue(driver, event);
3078
    qemuMigrationCookieFree(mig);
3079 3080 3081 3082
    if (orig_err) {
        virSetError(orig_err);
        virFreeError(orig_err);
    }
3083 3084
    return dom;
}
3085

3086 3087 3088 3089 3090 3091

int qemuMigrationConfirm(struct qemud_driver *driver,
                         virConnectPtr conn,
                         virDomainObjPtr vm,
                         const char *cookiein,
                         int cookieinlen,
E
Eric Blake 已提交
3092
                         unsigned int flags,
3093
                         int retcode)
3094 3095 3096 3097
{
    qemuMigrationCookiePtr mig;
    virDomainEventPtr event = NULL;
    int rv = -1;
3098
    VIR_DEBUG("driver=%p, conn=%p, vm=%p, cookiein=%s, cookieinlen=%d, "
3099
              "flags=%x, retcode=%d",
3100 3101
              driver, conn, vm, NULLSTR(cookiein), cookieinlen,
              flags, retcode);
3102

3103
    virCheckFlags(QEMU_MIGRATION_FLAGS, -1);
E
Eric Blake 已提交
3104

3105 3106 3107 3108 3109
    qemuMigrationJobSetPhase(driver, vm,
                             retcode == 0
                             ? QEMU_MIGRATION_PHASE_CONFIRM3
                             : QEMU_MIGRATION_PHASE_CONFIRM3_CANCELLED);

3110
    if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen, 0)))
3111 3112 3113 3114 3115 3116 3117
        return -1;

    /* Did the migration go as planned?  If yes, kill off the
     * domain object, but if no, resume CPUs
     */
    if (retcode == 0) {
        qemuProcessStop(driver, vm, 1, VIR_DOMAIN_SHUTOFF_MIGRATED);
3118
        virDomainAuditStop(vm, "migrated");
3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129

        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_STOPPED,
                                         VIR_DOMAIN_EVENT_STOPPED_MIGRATED);
    } else {

        /* run 'cont' on the destination, which allows migration on qemu
         * >= 0.10.6 to work properly.  This isn't strictly necessary on
         * older qemu's, but it also doesn't hurt anything there
         */
        if (qemuProcessStartCPUs(driver, vm, conn,
3130 3131
                                 VIR_DOMAIN_RUNNING_MIGRATED,
                                 QEMU_ASYNC_JOB_MIGRATION_OUT) < 0) {
3132 3133 3134
            if (virGetLastError() == NULL)
                qemuReportError(VIR_ERR_INTERNAL_ERROR,
                                "%s", _("resume operation failed"));
3135
            goto cleanup;
3136 3137 3138 3139 3140 3141 3142
        }

        event = virDomainEventNewFromObj(vm,
                                         VIR_DOMAIN_EVENT_RESUMED,
                                         VIR_DOMAIN_EVENT_RESUMED_MIGRATED);
        if (virDomainSaveStatus(driver->caps, driver->stateDir, vm) < 0) {
            VIR_WARN("Failed to save status on vm %s", vm->def->name);
3143
            goto cleanup;
3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156
        }
    }

    qemuMigrationCookieFree(mig);
    rv = 0;

cleanup:
    if (event)
        qemuDomainEventQueue(driver, event);
    return rv;
}


3157 3158 3159 3160 3161
/* Helper function called while driver lock is held and vm is active.  */
int
qemuMigrationToFile(struct qemud_driver *driver, virDomainObjPtr vm,
                    int fd, off_t offset, const char *path,
                    const char *compressor,
E
Eric Blake 已提交
3162
                    bool bypassSecurityDriver,
3163
                    enum qemuDomainAsyncJob asyncJob)
3164 3165 3166 3167 3168 3169
{
    qemuDomainObjPrivatePtr priv = vm->privateData;
    virCgroupPtr cgroup = NULL;
    int ret = -1;
    int rc;
    bool restoreLabel = false;
3170 3171
    virCommandPtr cmd = NULL;
    int pipeFD[2] = { -1, -1 };
3172 3173 3174 3175 3176 3177 3178 3179 3180 3181
    unsigned long saveMigBandwidth = priv->migMaxBandwidth;

    /* Increase migration bandwidth to unlimited since target is a file.
     * Failure to change migration speed is not fatal. */
    if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) == 0) {
        qemuMonitorSetMigrationSpeed(priv->mon,
                                     QEMU_DOMAIN_FILE_MIG_BANDWIDTH_MAX);
        priv->migMaxBandwidth = QEMU_DOMAIN_FILE_MIG_BANDWIDTH_MAX;
        qemuDomainObjExitMonitorWithDriver(driver, vm);
    }
3182

3183
    if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD) &&
3184
        (!compressor || pipe(pipeFD) == 0)) {
3185
        /* All right! We can use fd migration, which means that qemu
3186 3187 3188
         * doesn't have to open() the file, so while we still have to
         * grant SELinux access, we can do it on fd and avoid cleanup
         * later, as well as skip futzing with cgroup.  */
3189
        if (virSecurityManagerSetImageFDLabel(driver->securityManager, vm->def,
3190
                                              compressor ? pipeFD[1] : fd) < 0)
3191
            goto cleanup;
3192 3193 3194
        bypassSecurityDriver = true;
    } else {
        /* Phooey - we have to fall back on exec migration, where qemu
E
Eric Blake 已提交
3195 3196
         * has to popen() the file by name, and block devices have to be
         * given cgroup ACL permission.  We might also stumble on
3197 3198
         * a race present in some qemu versions where it does a wait()
         * that botches pclose.  */
E
Eric Blake 已提交
3199
        if (qemuCgroupControllerActive(driver,
3200 3201 3202 3203 3204 3205 3206 3207 3208 3209
                                       VIR_CGROUP_CONTROLLER_DEVICES)) {
            if (virCgroupForDomain(driver->cgroup, vm->def->name,
                                   &cgroup, 0) != 0) {
                qemuReportError(VIR_ERR_INTERNAL_ERROR,
                                _("Unable to find cgroup for %s"),
                                vm->def->name);
                goto cleanup;
            }
            rc = virCgroupAllowDevicePath(cgroup, path,
                                          VIR_CGROUP_DEVICE_RW);
3210
            virDomainAuditCgroupPath(vm, cgroup, "allow", path, "rw", rc);
E
Eric Blake 已提交
3211 3212 3213 3214
            if (rc == 1) {
                /* path was not a device, no further need for cgroup */
                virCgroupFree(&cgroup);
            } else if (rc < 0) {
3215 3216 3217 3218 3219
                virReportSystemError(-rc,
                                     _("Unable to allow device %s for %s"),
                                     path, vm->def->name);
                goto cleanup;
            }
3220
        }
3221 3222
        if ((!bypassSecurityDriver) &&
            virSecurityManagerSetSavedStateLabel(driver->securityManager,
3223
                                                 vm->def, path) < 0)
3224
            goto cleanup;
3225
        restoreLabel = true;
3226 3227
    }

3228
    if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
3229 3230
        goto cleanup;

3231 3232 3233
    if (!compressor) {
        const char *args[] = { "cat", NULL };

3234
        if (qemuCapsGet(priv->qemuCaps, QEMU_CAPS_MIGRATE_QEMU_FD) &&
3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250
            priv->monConfig->type == VIR_DOMAIN_CHR_TYPE_UNIX) {
            rc = qemuMonitorMigrateToFd(priv->mon,
                                        QEMU_MONITOR_MIGRATE_BACKGROUND,
                                        fd);
        } else {
            rc = qemuMonitorMigrateToFile(priv->mon,
                                          QEMU_MONITOR_MIGRATE_BACKGROUND,
                                          args, path, offset);
        }
    } else {
        const char *prog = compressor;
        const char *args[] = {
            prog,
            "-c",
            NULL
        };
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269
        if (pipeFD[0] != -1) {
            cmd = virCommandNewArgs(args);
            virCommandSetInputFD(cmd, pipeFD[0]);
            virCommandSetOutputFD(cmd, &fd);
            if (virSetCloseExec(pipeFD[1]) < 0) {
                virReportSystemError(errno, "%s",
                                     _("Unable to set cloexec flag"));
                qemuDomainObjExitMonitorWithDriver(driver, vm);
                goto cleanup;
            }
            if (virCommandRunAsync(cmd, NULL) < 0) {
                qemuDomainObjExitMonitorWithDriver(driver, vm);
                goto cleanup;
            }
            rc = qemuMonitorMigrateToFd(priv->mon,
                                        QEMU_MONITOR_MIGRATE_BACKGROUND,
                                        pipeFD[1]);
            if (VIR_CLOSE(pipeFD[0]) < 0 ||
                VIR_CLOSE(pipeFD[1]) < 0)
3270
                VIR_WARN("failed to close intermediate pipe");
3271 3272 3273 3274 3275
        } else {
            rc = qemuMonitorMigrateToFile(priv->mon,
                                          QEMU_MONITOR_MIGRATE_BACKGROUND,
                                          args, path, offset);
        }
3276
    }
3277
    qemuDomainObjExitMonitorWithDriver(driver, vm);
3278 3279 3280 3281

    if (rc < 0)
        goto cleanup;

3282
    rc = qemuMigrationWaitForCompletion(driver, vm, asyncJob, NULL);
3283 3284 3285 3286

    if (rc < 0)
        goto cleanup;

3287 3288 3289
    if (cmd && virCommandWait(cmd, NULL) < 0)
        goto cleanup;

3290 3291 3292
    ret = 0;

cleanup:
3293 3294 3295 3296 3297 3298 3299
    /* Restore max migration bandwidth */
    if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) == 0) {
        qemuMonitorSetMigrationSpeed(priv->mon, saveMigBandwidth);
        priv->migMaxBandwidth = saveMigBandwidth;
        qemuDomainObjExitMonitorWithDriver(driver, vm);
    }

3300 3301 3302
    VIR_FORCE_CLOSE(pipeFD[0]);
    VIR_FORCE_CLOSE(pipeFD[1]);
    virCommandFree(cmd);
3303 3304
    if (restoreLabel && (!bypassSecurityDriver) &&
        virSecurityManagerRestoreSavedStateLabel(driver->securityManager,
3305
                                                 vm->def, path) < 0)
3306 3307 3308 3309 3310
        VIR_WARN("failed to restore save state label on %s", path);

    if (cgroup != NULL) {
        rc = virCgroupDenyDevicePath(cgroup, path,
                                     VIR_CGROUP_DEVICE_RWM);
3311
        virDomainAuditCgroupPath(vm, cgroup, "deny", path, "rwm", rc);
3312 3313 3314 3315 3316 3317 3318
        if (rc < 0)
            VIR_WARN("Unable to deny device %s for %s %d",
                     path, vm->def->name, rc);
        virCgroupFree(&cgroup);
    }
    return ret;
}
3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329

int
qemuMigrationJobStart(struct qemud_driver *driver,
                      virDomainObjPtr vm,
                      enum qemuDomainAsyncJob job)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;

    if (qemuDomainObjBeginAsyncJobWithDriver(driver, vm, job) < 0)
        return -1;

3330
    if (job == QEMU_ASYNC_JOB_MIGRATION_IN) {
3331
        qemuDomainObjSetAsyncJobMask(vm, QEMU_JOB_NONE);
3332 3333
    } else {
        qemuDomainObjSetAsyncJobMask(vm, DEFAULT_JOB_MASK |
3334
                                     JOB_MASK(QEMU_JOB_SUSPEND) |
3335 3336
                                     JOB_MASK(QEMU_JOB_MIGRATION_OP));
    }
3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399

    priv->job.info.type = VIR_DOMAIN_JOB_UNBOUNDED;

    return 0;
}

void
qemuMigrationJobSetPhase(struct qemud_driver *driver,
                         virDomainObjPtr vm,
                         enum qemuMigrationJobPhase phase)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;

    if (phase < priv->job.phase) {
        VIR_ERROR(_("migration protocol going backwards %s => %s"),
                  qemuMigrationJobPhaseTypeToString(priv->job.phase),
                  qemuMigrationJobPhaseTypeToString(phase));
        return;
    }

    qemuDomainObjSetJobPhase(driver, vm, phase);
}

void
qemuMigrationJobStartPhase(struct qemud_driver *driver,
                           virDomainObjPtr vm,
                           enum qemuMigrationJobPhase phase)
{
    virDomainObjRef(vm);
    qemuMigrationJobSetPhase(driver, vm, phase);
}

int
qemuMigrationJobContinue(virDomainObjPtr vm)
{
    return virDomainObjUnref(vm);
}

bool
qemuMigrationJobIsActive(virDomainObjPtr vm,
                         enum qemuDomainAsyncJob job)
{
    qemuDomainObjPrivatePtr priv = vm->privateData;

    if (priv->job.asyncJob != job) {
        const char *msg;

        if (job == QEMU_ASYNC_JOB_MIGRATION_IN)
            msg = _("domain '%s' is not processing incoming migration");
        else
            msg = _("domain '%s' is not being migrated");

        qemuReportError(VIR_ERR_OPERATION_INVALID, msg, vm->def->name);
        return false;
    }
    return true;
}

int
qemuMigrationJobFinish(struct qemud_driver *driver, virDomainObjPtr vm)
{
    return qemuDomainObjEndAsyncJob(driver, vm);
}