libxl_domain.c 38.7 KB
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/*
 * libxl_domain.c: libxl domain object private state
 *
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 * Copyright (C) 2011-2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
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 *
 * 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, see
 * <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *     Jim Fehlig <jfehlig@suse.com>
 */

#include <config.h>

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#include <fcntl.h>

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#include "libxl_domain.h"

#include "viralloc.h"
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#include "viratomic.h"
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#include "virfile.h"
#include "virerror.h"
#include "virlog.h"
#include "virstring.h"
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#include "virtime.h"
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#define VIR_FROM_THIS VIR_FROM_LIBXL

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VIR_LOG_INIT("libxl.libxl_domain");
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VIR_ENUM_IMPL(libxlDomainJob, LIBXL_JOB_LAST,
              "none",
              "query",
              "destroy",
              "modify",
);

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/* Object used to store info related to libxl event registrations */
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typedef struct _libxlEventHookInfo libxlEventHookInfo;
typedef libxlEventHookInfo *libxlEventHookInfoPtr;
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struct _libxlEventHookInfo {
    libxlEventHookInfoPtr next;
    libxlDomainObjPrivatePtr priv;
    void *xl_priv;
    int id;
};

static virClassPtr libxlDomainObjPrivateClass;

static void
libxlDomainObjPrivateDispose(void *obj);

static int
libxlDomainObjPrivateOnceInit(void)
{
    if (!(libxlDomainObjPrivateClass = virClassNew(virClassForObjectLockable(),
                                                   "libxlDomainObjPrivate",
                                                   sizeof(libxlDomainObjPrivate),
                                                   libxlDomainObjPrivateDispose)))
        return -1;

    return 0;
}

VIR_ONCE_GLOBAL_INIT(libxlDomainObjPrivate)

static void
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libxlDomainObjFDEventHookInfoFree(void *obj)
{
    VIR_FREE(obj);
}

static void
libxlDomainObjTimerEventHookInfoFree(void *obj)
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{
    libxlEventHookInfoPtr info = obj;

    /* Drop reference on libxlDomainObjPrivate */
    virObjectUnref(info->priv);
    VIR_FREE(info);
}

static void
libxlDomainObjFDEventCallback(int watch ATTRIBUTE_UNUSED,
                              int fd,
                              int vir_events,
                              void *fd_info)
{
    libxlEventHookInfoPtr info = fd_info;
    int events = 0;

    virObjectLock(info->priv);
    if (vir_events & VIR_EVENT_HANDLE_READABLE)
        events |= POLLIN;
    if (vir_events & VIR_EVENT_HANDLE_WRITABLE)
        events |= POLLOUT;
    if (vir_events & VIR_EVENT_HANDLE_ERROR)
        events |= POLLERR;
    if (vir_events & VIR_EVENT_HANDLE_HANGUP)
        events |= POLLHUP;

    virObjectUnlock(info->priv);
    libxl_osevent_occurred_fd(info->priv->ctx, info->xl_priv, fd, 0, events);
}

static int
libxlDomainObjFDRegisterEventHook(void *priv,
                                  int fd,
                                  void **hndp,
                                  short events,
                                  void *xl_priv)
{
    int vir_events = VIR_EVENT_HANDLE_ERROR;
    libxlEventHookInfoPtr info;

    if (VIR_ALLOC(info) < 0)
        return -1;

    info->priv = priv;
    info->xl_priv = xl_priv;

    if (events & POLLIN)
        vir_events |= VIR_EVENT_HANDLE_READABLE;
    if (events & POLLOUT)
        vir_events |= VIR_EVENT_HANDLE_WRITABLE;

    info->id = virEventAddHandle(fd, vir_events, libxlDomainObjFDEventCallback,
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                                 info, libxlDomainObjFDEventHookInfoFree);
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    if (info->id < 0) {
        VIR_FREE(info);
        return -1;
    }

    *hndp = info;

    return 0;
}

static int
libxlDomainObjFDModifyEventHook(void *priv ATTRIBUTE_UNUSED,
                                int fd ATTRIBUTE_UNUSED,
                                void **hndp,
                                short events)
{
    libxlEventHookInfoPtr info = *hndp;
    int vir_events = VIR_EVENT_HANDLE_ERROR;

    virObjectLock(info->priv);
    if (events & POLLIN)
        vir_events |= VIR_EVENT_HANDLE_READABLE;
    if (events & POLLOUT)
        vir_events |= VIR_EVENT_HANDLE_WRITABLE;

    virEventUpdateHandle(info->id, vir_events);
    virObjectUnlock(info->priv);

    return 0;
}

static void
libxlDomainObjFDDeregisterEventHook(void *priv ATTRIBUTE_UNUSED,
                                    int fd ATTRIBUTE_UNUSED,
                                    void *hnd)
{
    libxlEventHookInfoPtr info = hnd;
    libxlDomainObjPrivatePtr p = info->priv;

    virObjectLock(p);
    virEventRemoveHandle(info->id);
    virObjectUnlock(p);
}

static void
libxlDomainObjTimerCallback(int timer ATTRIBUTE_UNUSED, void *timer_info)
{
    libxlEventHookInfoPtr info = timer_info;
    libxlDomainObjPrivatePtr p = info->priv;

    virObjectLock(p);
    /*
     * libxl expects the event to be deregistered when calling
     * libxl_osevent_occurred_timeout, but we dont want the event info
     * destroyed.  Disable the timeout and only remove it after returning
     * from libxl.
     */
    virEventUpdateTimeout(info->id, -1);
    virObjectUnlock(p);
    libxl_osevent_occurred_timeout(p->ctx, info->xl_priv);
    virObjectLock(p);
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    virEventRemoveTimeout(info->id);
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    virObjectUnlock(p);
}

static int
libxlDomainObjTimeoutRegisterEventHook(void *priv,
                                       void **hndp,
                                       struct timeval abs_t,
                                       void *xl_priv)
{
    libxlEventHookInfoPtr info;
    struct timeval now;
    struct timeval res;
    static struct timeval zero;
    int timeout;

    if (VIR_ALLOC(info) < 0)
        return -1;

    info->priv = priv;
    /*
     * Also take a reference on the domain object.  Reference is dropped in
     * libxlDomainObjEventHookInfoFree, ensuring the domain object outlives the
     * timeout event objects.
     */
    virObjectRef(info->priv);
    info->xl_priv = xl_priv;

    gettimeofday(&now, NULL);
    timersub(&abs_t, &now, &res);
    /* Ensure timeout is not overflowed */
    if (timercmp(&res, &zero, <)) {
        timeout = 0;
    } else if (res.tv_sec > INT_MAX / 1000) {
        timeout = INT_MAX;
    } else {
        timeout = res.tv_sec * 1000 + (res.tv_usec + 999) / 1000;
    }
    info->id = virEventAddTimeout(timeout, libxlDomainObjTimerCallback,
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                                  info, libxlDomainObjTimerEventHookInfoFree);
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    if (info->id < 0) {
        virObjectUnref(info->priv);
        VIR_FREE(info);
        return -1;
    }

    *hndp = info;

    return 0;
}

/*
 * Note:  There are two changes wrt timeouts starting with xen-unstable
 * changeset 26469:
 *
 * 1. Timeout modify callbacks will only be invoked with an abs_t of {0,0},
 * i.e. make the timeout fire immediately.  Prior to this commit, timeout
 * modify callbacks were never invoked.
 *
 * 2. Timeout deregister hooks will no longer be called.
 */
static int
libxlDomainObjTimeoutModifyEventHook(void *priv ATTRIBUTE_UNUSED,
                                     void **hndp,
                                     struct timeval abs_t ATTRIBUTE_UNUSED)
{
    libxlEventHookInfoPtr info = *hndp;

    virObjectLock(info->priv);
    /* Make the timeout fire */
    virEventUpdateTimeout(info->id, 0);
    virObjectUnlock(info->priv);

    return 0;
}

static void
libxlDomainObjTimeoutDeregisterEventHook(void *priv ATTRIBUTE_UNUSED,
                                         void *hnd)
{
    libxlEventHookInfoPtr info = hnd;
    libxlDomainObjPrivatePtr p = info->priv;

    virObjectLock(p);
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    virEventRemoveTimeout(info->id);
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    virObjectUnlock(p);
}


static const libxl_osevent_hooks libxl_event_callbacks = {
    .fd_register = libxlDomainObjFDRegisterEventHook,
    .fd_modify = libxlDomainObjFDModifyEventHook,
    .fd_deregister = libxlDomainObjFDDeregisterEventHook,
    .timeout_register = libxlDomainObjTimeoutRegisterEventHook,
    .timeout_modify = libxlDomainObjTimeoutModifyEventHook,
    .timeout_deregister = libxlDomainObjTimeoutDeregisterEventHook,
};

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static int
libxlDomainObjInitJob(libxlDomainObjPrivatePtr priv)
{
    memset(&priv->job, 0, sizeof(priv->job));

    if (virCondInit(&priv->job.cond) < 0)
        return -1;

    return 0;
}

static void
libxlDomainObjResetJob(libxlDomainObjPrivatePtr priv)
{
    struct libxlDomainJobObj *job = &priv->job;

    job->active = LIBXL_JOB_NONE;
    job->owner = 0;
}

static void
libxlDomainObjFreeJob(libxlDomainObjPrivatePtr priv)
{
    ignore_value(virCondDestroy(&priv->job.cond));
}

/* Give up waiting for mutex after 30 seconds */
#define LIBXL_JOB_WAIT_TIME (1000ull * 30)

/*
 * obj must be locked before calling, libxlDriverPrivatePtr must NOT be locked
 *
 * This must be called by anything that will change the VM state
 * in any way
 *
 * Upon successful return, the object will have its ref count increased,
 * successful calls must be followed by EndJob eventually
 */
int
libxlDomainObjBeginJob(libxlDriverPrivatePtr driver ATTRIBUTE_UNUSED,
                       virDomainObjPtr obj,
                       enum libxlDomainJob job)
{
    libxlDomainObjPrivatePtr priv = obj->privateData;
    unsigned long long now;
    unsigned long long then;

    if (virTimeMillisNow(&now) < 0)
        return -1;
    then = now + LIBXL_JOB_WAIT_TIME;

    virObjectRef(obj);

    while (priv->job.active) {
        VIR_DEBUG("Wait normal job condition for starting job: %s",
                  libxlDomainJobTypeToString(job));
        if (virCondWaitUntil(&priv->job.cond, &obj->parent.lock, then) < 0)
            goto error;
    }

    libxlDomainObjResetJob(priv);

    VIR_DEBUG("Starting job: %s", libxlDomainJobTypeToString(job));
    priv->job.active = job;
    priv->job.owner = virThreadSelfID();

    return 0;

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    VIR_WARN("Cannot start job (%s) for domain %s;"
             " current job is (%s) owned by (%d)",
             libxlDomainJobTypeToString(job),
             obj->def->name,
             libxlDomainJobTypeToString(priv->job.active),
             priv->job.owner);

    if (errno == ETIMEDOUT)
        virReportError(VIR_ERR_OPERATION_TIMEOUT,
                       "%s", _("cannot acquire state change lock"));
    else
        virReportSystemError(errno,
                             "%s", _("cannot acquire job mutex"));

    virObjectUnref(obj);
    return -1;
}

/*
 * obj must be locked before calling
 *
 * To be called after completing the work associated with the
 * earlier libxlDomainBeginJob() call
 *
 * Returns true if the remaining reference count on obj is
 * non-zero, false if the reference count has dropped to zero
 * and obj is disposed.
 */
bool
libxlDomainObjEndJob(libxlDriverPrivatePtr driver ATTRIBUTE_UNUSED,
                     virDomainObjPtr obj)
{
    libxlDomainObjPrivatePtr priv = obj->privateData;
    enum libxlDomainJob job = priv->job.active;

    VIR_DEBUG("Stopping job: %s",
              libxlDomainJobTypeToString(job));

    libxlDomainObjResetJob(priv);
    virCondSignal(&priv->job.cond);

    return virObjectUnref(obj);
}

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static void *
libxlDomainObjPrivateAlloc(void)
{
    libxlDomainObjPrivatePtr priv;

    if (libxlDomainObjPrivateInitialize() < 0)
        return NULL;

    if (!(priv = virObjectLockableNew(libxlDomainObjPrivateClass)))
        return NULL;

    if (!(priv->devs = virChrdevAlloc())) {
        virObjectUnref(priv);
        return NULL;
    }

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    if (libxlDomainObjInitJob(priv) < 0) {
        virChrdevFree(priv->devs);
        virObjectUnref(priv);
        return NULL;
    }

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    return priv;
}

static void
libxlDomainObjPrivateDispose(void *obj)
{
    libxlDomainObjPrivatePtr priv = obj;

    if (priv->deathW)
        libxl_evdisable_domain_death(priv->ctx, priv->deathW);

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    libxlDomainObjFreeJob(priv);
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    virChrdevFree(priv->devs);
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    libxl_ctx_free(priv->ctx);
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    if (priv->logger_file)
        VIR_FORCE_FCLOSE(priv->logger_file);

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    xtl_logger_destroy(priv->logger);
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}

static void
libxlDomainObjPrivateFree(void *data)
{
    libxlDomainObjPrivatePtr priv = data;

    if (priv->deathW) {
        libxl_evdisable_domain_death(priv->ctx, priv->deathW);
        priv->deathW = NULL;
    }

    virObjectUnref(priv);
}

virDomainXMLPrivateDataCallbacks libxlDomainXMLPrivateDataCallbacks = {
    .alloc = libxlDomainObjPrivateAlloc,
    .free = libxlDomainObjPrivateFree,
};


static int
libxlDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
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                              const virDomainDef *def,
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                              virCapsPtr caps ATTRIBUTE_UNUSED,
                              void *opaque ATTRIBUTE_UNUSED)
{
    if (dev->type == VIR_DOMAIN_DEVICE_CHR &&
        dev->data.chr->deviceType == VIR_DOMAIN_CHR_DEVICE_TYPE_CONSOLE &&
        dev->data.chr->targetType == VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_NONE &&
        STRNEQ(def->os.type, "hvm"))
        dev->data.chr->targetType = VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_XEN;

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    if (dev->type == VIR_DOMAIN_DEVICE_HOSTDEV ||
        (dev->type == VIR_DOMAIN_DEVICE_NET &&
         dev->data.net->type == VIR_DOMAIN_NET_TYPE_HOSTDEV)) {

        virDomainHostdevDefPtr hostdev;
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        virDomainHostdevSubsysPCIPtr pcisrc;
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        if (dev->type == VIR_DOMAIN_DEVICE_NET)
            hostdev = &(dev->data.net)->data.hostdev.def;
        else
            hostdev = dev->data.hostdev;
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        pcisrc = &hostdev->source.subsys.u.pci;
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        /* forbid capabilities mode hostdev in this kind of hypervisor */
        if (hostdev->mode == VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES) {
            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                           _("hostdev mode 'capabilities' is not "
                             "supported in %s"),
                           virDomainVirtTypeToString(def->virtType));
            return -1;
        }

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        if (hostdev->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS &&
            hostdev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI &&
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            pcisrc->backend == VIR_DOMAIN_HOSTDEV_PCI_BACKEND_DEFAULT)
            pcisrc->backend = VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN;
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    }

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    return 0;
}

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static int
libxlDomainDefPostParse(virDomainDefPtr def,
                        virCapsPtr caps ATTRIBUTE_UNUSED,
                        void *opaque ATTRIBUTE_UNUSED)
{
    if (STREQ(def->os.type, "hvm"))
        return 0;

    if (def->nconsoles == 0) {
        virDomainChrDefPtr chrdef;

        if (!(chrdef = virDomainChrDefNew()))
            return -1;

        chrdef->source.type = VIR_DOMAIN_CHR_TYPE_PTY;
        chrdef->deviceType = VIR_DOMAIN_CHR_DEVICE_TYPE_CONSOLE;
        chrdef->target.port = 0;
        chrdef->targetType = VIR_DOMAIN_CHR_CONSOLE_TARGET_TYPE_XEN;

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        if (VIR_ALLOC_N(def->consoles, 1) < 0) {
            virDomainChrDefFree(chrdef);
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            return -1;
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        }
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        def->nconsoles = 1;
        def->consoles[0] = chrdef;
    }
    return 0;
}

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virDomainDefParserConfig libxlDomainDefParserConfig = {
    .macPrefix = { 0x00, 0x16, 0x3e },
    .devicesPostParseCallback = libxlDomainDeviceDefPostParse,
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    .domainPostParseCallback = libxlDomainDefPostParse,
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};

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struct libxlShutdownThreadInfo
{
    virDomainObjPtr vm;
    libxl_event *event;
};


static void
libxlDomainShutdownThread(void *opaque)
{
    struct libxlShutdownThreadInfo *shutdown_info = opaque;
    virDomainObjPtr vm = shutdown_info->vm;
    libxlDomainObjPrivatePtr priv = vm->privateData;
    libxl_event *ev = shutdown_info->event;
    libxlDriverPrivatePtr driver = priv->driver;
    libxl_ctx *ctx = priv->ctx;
    virObjectEventPtr dom_event = NULL;
    libxl_shutdown_reason xl_reason = ev->u.domain_shutdown.shutdown_reason;
    virDomainShutoffReason reason = VIR_DOMAIN_SHUTOFF_SHUTDOWN;

    virObjectLock(vm);

    if (xl_reason == LIBXL_SHUTDOWN_REASON_POWEROFF) {
        dom_event = virDomainEventLifecycleNewFromObj(vm,
                                           VIR_DOMAIN_EVENT_STOPPED,
                                           VIR_DOMAIN_EVENT_STOPPED_SHUTDOWN);
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        switch ((virDomainLifecycleAction) vm->def->onPoweroff) {
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        case VIR_DOMAIN_LIFECYCLE_DESTROY:
            reason = VIR_DOMAIN_SHUTOFF_SHUTDOWN;
            goto destroy;
        case VIR_DOMAIN_LIFECYCLE_RESTART:
        case VIR_DOMAIN_LIFECYCLE_RESTART_RENAME:
            goto restart;
        case VIR_DOMAIN_LIFECYCLE_PRESERVE:
        case VIR_DOMAIN_LIFECYCLE_LAST:
            goto cleanup;
        }
    } else if (xl_reason == LIBXL_SHUTDOWN_REASON_CRASH) {
        dom_event = virDomainEventLifecycleNewFromObj(vm,
                                           VIR_DOMAIN_EVENT_STOPPED,
                                           VIR_DOMAIN_EVENT_STOPPED_CRASHED);
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        switch ((virDomainLifecycleCrashAction) vm->def->onCrash) {
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        case VIR_DOMAIN_LIFECYCLE_CRASH_DESTROY:
            reason = VIR_DOMAIN_SHUTOFF_CRASHED;
            goto destroy;
        case VIR_DOMAIN_LIFECYCLE_CRASH_RESTART:
        case VIR_DOMAIN_LIFECYCLE_CRASH_RESTART_RENAME:
            goto restart;
        case VIR_DOMAIN_LIFECYCLE_CRASH_PRESERVE:
        case VIR_DOMAIN_LIFECYCLE_CRASH_LAST:
            goto cleanup;
        case VIR_DOMAIN_LIFECYCLE_CRASH_COREDUMP_DESTROY:
            libxlDomainAutoCoreDump(driver, vm);
            goto destroy;
        case VIR_DOMAIN_LIFECYCLE_CRASH_COREDUMP_RESTART:
            libxlDomainAutoCoreDump(driver, vm);
            goto restart;
        }
    } else if (xl_reason == LIBXL_SHUTDOWN_REASON_REBOOT) {
        dom_event = virDomainEventLifecycleNewFromObj(vm,
                                           VIR_DOMAIN_EVENT_STOPPED,
                                           VIR_DOMAIN_EVENT_STOPPED_SHUTDOWN);
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        switch ((virDomainLifecycleAction) vm->def->onReboot) {
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        case VIR_DOMAIN_LIFECYCLE_DESTROY:
            reason = VIR_DOMAIN_SHUTOFF_SHUTDOWN;
            goto destroy;
        case VIR_DOMAIN_LIFECYCLE_RESTART:
        case VIR_DOMAIN_LIFECYCLE_RESTART_RENAME:
            goto restart;
        case VIR_DOMAIN_LIFECYCLE_PRESERVE:
        case VIR_DOMAIN_LIFECYCLE_LAST:
            goto cleanup;
        }
    } else {
        VIR_INFO("Unhandled shutdown_reason %d", xl_reason);
        goto cleanup;
    }

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 destroy:
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    if (dom_event) {
        libxlDomainEventQueue(driver, dom_event);
        dom_event = NULL;
    }
    libxl_domain_destroy(ctx, vm->def->id, NULL);
    if (libxlDomainCleanupJob(driver, vm, reason)) {
        if (!vm->persistent) {
            virDomainObjListRemove(driver->domains, vm);
            vm = NULL;
        }
    }
    goto cleanup;

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 restart:
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    if (dom_event) {
        libxlDomainEventQueue(driver, dom_event);
        dom_event = NULL;
    }
    libxl_domain_destroy(ctx, vm->def->id, NULL);
    libxlDomainCleanupJob(driver, vm, VIR_DOMAIN_SHUTOFF_SHUTDOWN);
    libxlDomainStart(driver, vm, 0, -1);

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 cleanup:
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    if (vm)
        virObjectUnlock(vm);
    if (dom_event)
        libxlDomainEventQueue(driver, dom_event);
    libxl_event_free(ctx, ev);
    VIR_FREE(shutdown_info);
}

/*
 * Handle previously registered domain event notification from libxenlight.
 *
 * Note: Xen 4.3 removed the const from the event handler signature.
 * Detect which signature to use based on
 * LIBXL_HAVE_NONCONST_EVENT_OCCURS_EVENT_ARG.
 */
#ifdef LIBXL_HAVE_NONCONST_EVENT_OCCURS_EVENT_ARG
# define VIR_LIBXL_EVENT_CONST /* empty */
#else
# define VIR_LIBXL_EVENT_CONST const
#endif

static void
libxlEventHandler(void *data, VIR_LIBXL_EVENT_CONST libxl_event *event)
{
    virDomainObjPtr vm = data;
    libxlDomainObjPrivatePtr priv = vm->privateData;
    libxl_shutdown_reason xl_reason = event->u.domain_shutdown.shutdown_reason;
    struct libxlShutdownThreadInfo *shutdown_info;
    virThread thread;

    if (event->type != LIBXL_EVENT_TYPE_DOMAIN_SHUTDOWN) {
        VIR_INFO("Unhandled event type %d", event->type);
        goto error;
    }

    /*
     * Similar to the xl implementation, ignore SUSPEND.  Any actions needed
     * after calling libxl_domain_suspend() are handled by it's callers.
     */
    if (xl_reason == LIBXL_SHUTDOWN_REASON_SUSPEND)
        goto error;

    /*
     * Start a thread to handle shutdown.  We don't want to be tying up
     * libxl's event machinery by doing a potentially lengthy shutdown.
     */
    if (VIR_ALLOC(shutdown_info) < 0)
        goto error;

    shutdown_info->vm = data;
    shutdown_info->event = (libxl_event *)event;
    if (virThreadCreate(&thread, false, libxlDomainShutdownThread,
                        shutdown_info) < 0) {
        /*
         * Not much we can do on error here except log it.
         */
        VIR_ERROR(_("Failed to create thread to handle domain shutdown"));
        goto error;
    }

    /*
     * libxl_event freed in shutdown thread
     */
    return;

720
 error:
721 722 723 724 725 726 727 728 729 730
    /* Cast away any const */
    libxl_event_free(priv->ctx, (libxl_event *)event);
}

const struct libxl_event_hooks ev_hooks = {
    .event_occurs_mask = LIBXL_EVENTMASK_ALL,
    .event_occurs = libxlEventHandler,
    .disaster = NULL,
};

J
Jim Fehlig 已提交
731 732 733 734 735 736 737 738
static const libxl_childproc_hooks libxl_child_hooks = {
#ifdef LIBXL_HAVE_SIGCHLD_OWNER_SELECTIVE_REAP
    .chldowner = libxl_sigchld_owner_libxl_always_selective_reap,
#else
    .chldowner = libxl_sigchld_owner_libxl,
#endif
};

J
Jim Fehlig 已提交
739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775
int
libxlDomainObjPrivateInitCtx(virDomainObjPtr vm)
{
    libxlDomainObjPrivatePtr priv = vm->privateData;
    char *log_file;
    int ret = -1;

    if (priv->ctx)
        return 0;

    if (virAsprintf(&log_file, "%s/%s.log", LIBXL_LOG_DIR, vm->def->name) < 0)
        return -1;

    if ((priv->logger_file = fopen(log_file, "a")) == NULL)  {
        virReportSystemError(errno,
                             _("failed to open logfile %s"),
                             log_file);
        goto cleanup;
    }

    priv->logger =
        (xentoollog_logger *)xtl_createlogger_stdiostream(priv->logger_file,
                                                          XTL_DEBUG, 0);
    if (!priv->logger) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("cannot create libxenlight logger for domain %s"),
                       vm->def->name);
        goto cleanup;
    }

    if (libxl_ctx_alloc(&priv->ctx, LIBXL_VERSION, 0, priv->logger)) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Failed libxl context initialization"));
        goto cleanup;
    }

    libxl_osevent_register_hooks(priv->ctx, &libxl_event_callbacks, priv);
J
Jim Fehlig 已提交
776
    libxl_childproc_setmode(priv->ctx, &libxl_child_hooks, priv);
J
Jim Fehlig 已提交
777 778 779

    ret = 0;

780
 cleanup:
J
Jim Fehlig 已提交
781 782 783
    VIR_FREE(log_file);
    return ret;
}
784 785 786 787 788 789

void
libxlDomainEventQueue(libxlDriverPrivatePtr driver, virObjectEventPtr event)
{
    virObjectEventStateQueue(driver->domainEventState, event);
}
790 791

char *
792 793
libxlDomainManagedSavePath(libxlDriverPrivatePtr driver, virDomainObjPtr vm)
{
794 795 796 797 798 799 800
    char *ret;
    libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);

    ignore_value(virAsprintf(&ret, "%s/%s.save", cfg->saveDir, vm->def->name));
    virObjectUnref(cfg);
    return ret;
}
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868

/*
 * Open a saved image file and initialize domain definition from the header.
 *
 * Returns the opened fd on success, -1 on failure.
 */
int
libxlDomainSaveImageOpen(libxlDriverPrivatePtr driver,
                         libxlDriverConfigPtr cfg,
                         const char *from,
                         virDomainDefPtr *ret_def,
                         libxlSavefileHeaderPtr ret_hdr)
{
    int fd;
    virDomainDefPtr def = NULL;
    libxlSavefileHeader hdr;
    char *xml = NULL;

    if ((fd = virFileOpenAs(from, O_RDONLY, 0, -1, -1, 0)) < 0) {
        virReportSystemError(-fd,
                             _("Failed to open domain image file '%s'"), from);
        goto error;
    }

    if (saferead(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
        virReportError(VIR_ERR_OPERATION_FAILED,
                       "%s", _("failed to read libxl header"));
        goto error;
    }

    if (memcmp(hdr.magic, LIBXL_SAVE_MAGIC, sizeof(hdr.magic))) {
        virReportError(VIR_ERR_INVALID_ARG, "%s", _("image magic is incorrect"));
        goto error;
    }

    if (hdr.version > LIBXL_SAVE_VERSION) {
        virReportError(VIR_ERR_OPERATION_FAILED,
                       _("image version is not supported (%d > %d)"),
                       hdr.version, LIBXL_SAVE_VERSION);
        goto error;
    }

    if (hdr.xmlLen <= 0) {
        virReportError(VIR_ERR_OPERATION_FAILED,
                       _("invalid XML length: %d"), hdr.xmlLen);
        goto error;
    }

    if (VIR_ALLOC_N(xml, hdr.xmlLen) < 0)
        goto error;

    if (saferead(fd, xml, hdr.xmlLen) != hdr.xmlLen) {
        virReportError(VIR_ERR_OPERATION_FAILED, "%s", _("failed to read XML"));
        goto error;
    }

    if (!(def = virDomainDefParseString(xml, cfg->caps, driver->xmlopt,
                                        1 << VIR_DOMAIN_VIRT_XEN,
                                        VIR_DOMAIN_XML_INACTIVE)))
        goto error;

    VIR_FREE(xml);

    *ret_def = def;
    *ret_hdr = hdr;

    return fd;

869
 error:
870 871 872 873 874
    VIR_FREE(xml);
    virDomainDefFree(def);
    VIR_FORCE_CLOSE(fd);
    return -1;
}
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964

/*
 * Cleanup function for domain that has reached shutoff state.
 *
 * virDomainObjPtr must be locked on invocation
 */
void
libxlDomainCleanup(libxlDriverPrivatePtr driver,
                   virDomainObjPtr vm,
                   virDomainShutoffReason reason)
{
    libxlDomainObjPrivatePtr priv = vm->privateData;
    libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
    int vnc_port;
    char *file;
    size_t i;
    virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;

    virHostdevReAttachDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
                                    vm->def, VIR_HOSTDEV_SP_PCI, NULL);

    vm->def->id = -1;

    if (priv->deathW) {
        libxl_evdisable_domain_death(priv->ctx, priv->deathW);
        priv->deathW = NULL;
    }

    if (vm->persistent)
        virDomainObjSetState(vm, VIR_DOMAIN_SHUTOFF, reason);

    if (virAtomicIntDecAndTest(&driver->nactive) && driver->inhibitCallback)
        driver->inhibitCallback(false, driver->inhibitOpaque);

    if ((vm->def->ngraphics == 1) &&
        vm->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC &&
        vm->def->graphics[0]->data.vnc.autoport) {
        vnc_port = vm->def->graphics[0]->data.vnc.port;
        if (vnc_port >= LIBXL_VNC_PORT_MIN) {
            if (virPortAllocatorRelease(driver->reservedVNCPorts,
                                        vnc_port) < 0)
                VIR_DEBUG("Could not mark port %d as unused", vnc_port);
        }
    }

    /* Remove any cputune settings */
    if (vm->def->cputune.nvcpupin) {
        for (i = 0; i < vm->def->cputune.nvcpupin; ++i) {
            virBitmapFree(vm->def->cputune.vcpupin[i]->cpumask);
            VIR_FREE(vm->def->cputune.vcpupin[i]);
        }
        VIR_FREE(vm->def->cputune.vcpupin);
        vm->def->cputune.nvcpupin = 0;
    }

    if (virAsprintf(&file, "%s/%s.xml", cfg->stateDir, vm->def->name) > 0) {
        if (unlink(file) < 0 && errno != ENOENT && errno != ENOTDIR)
            VIR_DEBUG("Failed to remove domain XML for %s", vm->def->name);
        VIR_FREE(file);
    }

    if (vm->newDef) {
        virDomainDefFree(vm->def);
        vm->def = vm->newDef;
        vm->def->id = -1;
        vm->newDef = NULL;
    }

    virObjectUnref(cfg);
}

/*
 * Cleanup function for domain that has reached shutoff state.
 * Executed in the context of a job.
 *
 * virDomainObjPtr should be locked on invocation
 * Returns true if references remain on virDomainObjPtr, false otherwise.
 */
bool
libxlDomainCleanupJob(libxlDriverPrivatePtr driver,
                      virDomainObjPtr vm,
                      virDomainShutoffReason reason)
{
    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_DESTROY) < 0)
        return true;

    libxlDomainCleanup(driver, vm, reason);

    return libxlDomainObjEndJob(driver, vm);
}
965 966 967 968 969

/*
 * Register for domain events emitted by libxl.
 */
int
970
libxlDomainEventsRegister(libxlDriverPrivatePtr driver, virDomainObjPtr vm)
971 972 973
{
    libxlDomainObjPrivatePtr priv = vm->privateData;

974
    priv->driver = driver;
975 976 977 978 979 980 981 982
    libxl_event_register_callbacks(priv->ctx, &ev_hooks, vm);

    /* Always enable domain death events */
    if (libxl_evenable_domain_death(priv->ctx, vm->def->id, 0, &priv->deathW))
        goto error;

    return 0;

983
 error:
984 985 986 987 988 989
    if (priv->deathW) {
        libxl_evdisable_domain_death(priv->ctx, priv->deathW);
        priv->deathW = NULL;
    }
    return -1;
}
990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027

/*
 * Core dump domain to default dump path.
 *
 * virDomainObjPtr must be locked on invocation
 */
int
libxlDomainAutoCoreDump(libxlDriverPrivatePtr driver,
                        virDomainObjPtr vm)
{
    libxlDomainObjPrivatePtr priv = vm->privateData;
    libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
    time_t curtime = time(NULL);
    char timestr[100];
    struct tm time_info;
    char *dumpfile = NULL;
    int ret = -1;

    localtime_r(&curtime, &time_info);
    strftime(timestr, sizeof(timestr), "%Y-%m-%d-%H:%M:%S", &time_info);

    if (virAsprintf(&dumpfile, "%s/%s-%s",
                    cfg->autoDumpDir,
                    vm->def->name,
                    timestr) < 0)
        goto cleanup;

    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
        goto cleanup;

    /* Unlock virDomainObj while dumping core */
    virObjectUnlock(vm);
    libxl_domain_core_dump(priv->ctx, vm->def->id, dumpfile, NULL);
    virObjectLock(vm);

    ignore_value(libxlDomainObjEndJob(driver, vm));
    ret = 0;

1028
 cleanup:
1029 1030 1031 1032 1033
    VIR_FREE(dumpfile);
    virObjectUnref(cfg);

    return ret;
}
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 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

int
libxlDomainSetVcpuAffinities(libxlDriverPrivatePtr driver, virDomainObjPtr vm)
{
    libxlDomainObjPrivatePtr priv = vm->privateData;
    virDomainDefPtr def = vm->def;
    libxl_bitmap map;
    virBitmapPtr cpumask = NULL;
    uint8_t *cpumap = NULL;
    virNodeInfo nodeinfo;
    size_t cpumaplen;
    int vcpu;
    size_t i;
    int ret = -1;

    if (libxlDriverNodeGetInfo(driver, &nodeinfo) < 0)
        goto cleanup;

    cpumaplen = VIR_CPU_MAPLEN(VIR_NODEINFO_MAXCPUS(nodeinfo));

    for (vcpu = 0; vcpu < def->cputune.nvcpupin; ++vcpu) {
        if (vcpu != def->cputune.vcpupin[vcpu]->vcpuid)
            continue;

        if (VIR_ALLOC_N(cpumap, cpumaplen) < 0)
            goto cleanup;

        cpumask = def->cputune.vcpupin[vcpu]->cpumask;

        for (i = 0; i < virBitmapSize(cpumask); ++i) {
            bool bit;
            ignore_value(virBitmapGetBit(cpumask, i, &bit));
            if (bit)
                VIR_USE_CPU(cpumap, i);
        }

        map.size = cpumaplen;
        map.map = cpumap;

        if (libxl_set_vcpuaffinity(priv->ctx, def->id, vcpu, &map) != 0) {
            virReportError(VIR_ERR_INTERNAL_ERROR,
                           _("Failed to pin vcpu '%d' with libxenlight"), vcpu);
            goto cleanup;
        }

        VIR_FREE(cpumap);
    }

    ret = 0;

1084
 cleanup:
1085 1086 1087
    VIR_FREE(cpumap);
    return ret;
}
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126

int
libxlDomainFreeMem(libxlDomainObjPrivatePtr priv, libxl_domain_config *d_config)
{
    uint32_t needed_mem;
    uint32_t free_mem;
    size_t i;
    int ret = -1;
    int tries = 3;
    int wait_secs = 10;

    if ((ret = libxl_domain_need_memory(priv->ctx, &d_config->b_info,
                                        &needed_mem)) >= 0) {
        for (i = 0; i < tries; ++i) {
            if ((ret = libxl_get_free_memory(priv->ctx, &free_mem)) < 0)
                break;

            if (free_mem >= needed_mem) {
                ret = 0;
                break;
            }

            if ((ret = libxl_set_memory_target(priv->ctx, 0,
                                               free_mem - needed_mem,
                                               /* relative */ 1, 0)) < 0)
                break;

            ret = libxl_wait_for_free_memory(priv->ctx, 0, needed_mem,
                                             wait_secs);
            if (ret == 0 || ret != ERROR_NOMEM)
                break;

            if ((ret = libxl_wait_for_memory_target(priv->ctx, 0, 1)) < 0)
                break;
        }
    }

    return ret;
}
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152

/*
 * Start a domain through libxenlight.
 *
 * virDomainObjPtr must be locked on invocation
 */
int
libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
                 bool start_paused, int restore_fd)
{
    libxl_domain_config d_config;
    virDomainDefPtr def = NULL;
    virObjectEventPtr event = NULL;
    libxlSavefileHeader hdr;
    int ret = -1;
    uint32_t domid = 0;
    char *dom_xml = NULL;
    char *managed_save_path = NULL;
    int managed_save_fd = -1;
    libxlDomainObjPrivatePtr priv = vm->privateData;
    libxlDriverConfigPtr cfg;
#ifdef LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS
    libxl_domain_restore_params params;
#endif
    virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;

1153 1154
    libxl_domain_config_init(&d_config);

1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
    if (libxlDomainObjPrivateInitCtx(vm) < 0)
        return ret;

    if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
        return ret;

    cfg = libxlDriverConfigGet(driver);
    /* If there is a managed saved state restore it instead of starting
     * from scratch. The old state is removed once the restoring succeeded. */
    if (restore_fd < 0) {
        managed_save_path = libxlDomainManagedSavePath(driver, vm);
        if (managed_save_path == NULL)
            goto endjob;

        if (virFileExists(managed_save_path)) {

            managed_save_fd = libxlDomainSaveImageOpen(driver, cfg,
                                                       managed_save_path,
                                                       &def, &hdr);
            if (managed_save_fd < 0)
                goto endjob;

            restore_fd = managed_save_fd;

            if (STRNEQ(vm->def->name, def->name) ||
                memcmp(vm->def->uuid, def->uuid, VIR_UUID_BUFLEN)) {
                char vm_uuidstr[VIR_UUID_STRING_BUFLEN];
                char def_uuidstr[VIR_UUID_STRING_BUFLEN];
                virUUIDFormat(vm->def->uuid, vm_uuidstr);
                virUUIDFormat(def->uuid, def_uuidstr);
                virReportError(VIR_ERR_OPERATION_FAILED,
                               _("cannot restore domain '%s' uuid %s from a file"
                                 " which belongs to domain '%s' uuid %s"),
                               vm->def->name, vm_uuidstr, def->name, def_uuidstr);
                goto endjob;
            }

            virDomainObjAssignDef(vm, def, true, NULL);
            def = NULL;

            if (unlink(managed_save_path) < 0)
                VIR_WARN("Failed to remove the managed state %s",
                         managed_save_path);

            vm->hasManagedSave = false;
        }
        VIR_FREE(managed_save_path);
    }

1204
    if (libxlBuildDomainConfig(driver->reservedVNCPorts, vm->def,
1205
                               priv->ctx, &d_config) < 0)
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252
        goto endjob;

    if (cfg->autoballoon && libxlDomainFreeMem(priv, &d_config) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("libxenlight failed to get free memory for domain '%s'"),
                       d_config.c_info.name);
        goto endjob;
    }

    if (virHostdevPrepareDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
                                       vm->def, VIR_HOSTDEV_SP_PCI) < 0)
        goto endjob;

    /* Unlock virDomainObj while creating the domain */
    virObjectUnlock(vm);
    if (restore_fd < 0) {
        ret = libxl_domain_create_new(priv->ctx, &d_config,
                                      &domid, NULL, NULL);
    } else {
#ifdef LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS
        params.checkpointed_stream = 0;
        ret = libxl_domain_create_restore(priv->ctx, &d_config, &domid,
                                          restore_fd, &params, NULL, NULL);
#else
        ret = libxl_domain_create_restore(priv->ctx, &d_config, &domid,
                                          restore_fd, NULL, NULL);
#endif
    }
    virObjectLock(vm);

    if (ret) {
        if (restore_fd < 0)
            virReportError(VIR_ERR_INTERNAL_ERROR,
                           _("libxenlight failed to create new domain '%s'"),
                           d_config.c_info.name);
        else
            virReportError(VIR_ERR_INTERNAL_ERROR,
                           _("libxenlight failed to restore domain '%s'"),
                           d_config.c_info.name);
        goto endjob;
    }

    /*
     * The domain has been successfully created with libxl, so it should
     * be cleaned up if there are any subsequent failures.
     */
    vm->def->id = domid;
1253
    if (libxlDomainEventsRegister(driver, vm) < 0)
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
        goto cleanup_dom;

    if ((dom_xml = virDomainDefFormat(vm->def, 0)) == NULL)
        goto cleanup_dom;

    if (libxl_userdata_store(priv->ctx, domid, "libvirt-xml",
                             (uint8_t *)dom_xml, strlen(dom_xml) + 1)) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("libxenlight failed to store userdata"));
        goto cleanup_dom;
    }

    if (libxlDomainSetVcpuAffinities(driver, vm) < 0)
        goto cleanup_dom;

    if (!start_paused) {
        libxl_domain_unpause(priv->ctx, domid);
        virDomainObjSetState(vm, VIR_DOMAIN_RUNNING, VIR_DOMAIN_RUNNING_BOOTED);
    } else {
        virDomainObjSetState(vm, VIR_DOMAIN_PAUSED, VIR_DOMAIN_PAUSED_USER);
    }

    if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm) < 0)
        goto cleanup_dom;

    if (virAtomicIntInc(&driver->nactive) == 1 && driver->inhibitCallback)
        driver->inhibitCallback(true, driver->inhibitOpaque);

    event = virDomainEventLifecycleNewFromObj(vm, VIR_DOMAIN_EVENT_STARTED,
                                     restore_fd < 0 ?
                                         VIR_DOMAIN_EVENT_STARTED_BOOTED :
                                         VIR_DOMAIN_EVENT_STARTED_RESTORED);
    if (event)
        libxlDomainEventQueue(driver, event);

    ret = 0;
    goto endjob;

1292
 cleanup_dom:
1293 1294 1295 1296
    libxl_domain_destroy(priv->ctx, domid, NULL);
    vm->def->id = -1;
    virDomainObjSetState(vm, VIR_DOMAIN_SHUTOFF, VIR_DOMAIN_SHUTOFF_FAILED);

1297
 endjob:
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
    if (!libxlDomainObjEndJob(driver, vm))
        vm = NULL;

    libxl_domain_config_dispose(&d_config);
    VIR_FREE(dom_xml);
    VIR_FREE(managed_save_path);
    virDomainDefFree(def);
    VIR_FORCE_CLOSE(managed_save_fd);
    virObjectUnref(cfg);
    return ret;
}
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331

bool
libxlDomainDefCheckABIStability(libxlDriverPrivatePtr driver,
                                virDomainDefPtr src,
                                virDomainDefPtr dst)
{
    virDomainDefPtr migratableDefSrc = NULL;
    virDomainDefPtr migratableDefDst = NULL;
    libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
    bool ret = false;

    if (!(migratableDefSrc = virDomainDefCopy(src, cfg->caps, driver->xmlopt, true)) ||
        !(migratableDefDst = virDomainDefCopy(dst, cfg->caps, driver->xmlopt, true)))
        goto cleanup;

    ret = virDomainDefCheckABIStability(migratableDefSrc, migratableDefDst);

 cleanup:
    virDomainDefFree(migratableDefSrc);
    virDomainDefFree(migratableDefDst);
    virObjectUnref(cfg);
    return ret;
}