hyperv_driver.c

/*
 * hyperv_driver.c: core driver functions for managing Microsoft Hyper-V hosts
 *
 * Copyright (C) 2011-2013 Matthias Bolte <matthias.bolte@googlemail.com>
 * Copyright (C) 2009 Michael Sievers <msievers83@googlemail.com>
 *
 * 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/>.
 *
 */

#include <config.h>

#include "internal.h"
#include "datatypes.h"
#include "virdomainobjlist.h"
#include "virauth.h"
#include "viralloc.h"
#include "virlog.h"
#include "viruuid.h"
#include "hyperv_driver.h"
#include "hyperv_private.h"
#include "hyperv_util.h"
#include "hyperv_wmi.h"
#include "openwsman.h"
#include "virstring.h"

#define VIR_FROM_THIS VIR_FROM_HYPERV

VIR_LOG_INIT("hyperv.hyperv_driver");

static void
hypervFreePrivate(hypervPrivate **priv)
{
    if (priv == NULL || *priv == NULL)
        return;

    if ((*priv)->client != NULL) {
        /* FIXME: This leaks memory due to bugs in openwsman <= 2.2.6 */
        wsmc_release((*priv)->client);
    }

    hypervFreeParsedUri(&(*priv)->parsedUri);
    VIR_FREE(*priv);
}



static virDrvOpenStatus
hypervConnectOpen(virConnectPtr conn, virConnectAuthPtr auth, unsigned int flags)
{
    virDrvOpenStatus result = VIR_DRV_OPEN_ERROR;
    char *plus;
    hypervPrivate *priv = NULL;
    char *username = NULL;
    char *password = NULL;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystem = NULL;

    virCheckFlags(VIR_CONNECT_RO, VIR_DRV_OPEN_ERROR);

    /* Decline if the URI is NULL or the scheme is NULL */
    if (conn->uri == NULL || conn->uri->scheme == NULL)
        return VIR_DRV_OPEN_DECLINED;

    /* Decline if the scheme is not hyperv */
    plus = strchr(conn->uri->scheme, '+');

    if (plus == NULL) {
        if (STRCASENEQ(conn->uri->scheme, "hyperv"))
            return VIR_DRV_OPEN_DECLINED;
    } else {
        if (plus - conn->uri->scheme != 6 ||
            STRCASENEQLEN(conn->uri->scheme, "hyperv", 6)) {
            return VIR_DRV_OPEN_DECLINED;
        }

        virReportError(VIR_ERR_INVALID_ARG,
                       _("Transport '%s' in URI scheme is not supported, try again "
                         "without the transport part"), plus + 1);
        return VIR_DRV_OPEN_ERROR;
    }

    /* Require server part */
    if (conn->uri->server == NULL) {
        virReportError(VIR_ERR_INVALID_ARG, "%s",
                       _("URI is missing the server part"));
        return VIR_DRV_OPEN_ERROR;
    }

    /* Require auth */
    if (auth == NULL || auth->cb == NULL) {
        virReportError(VIR_ERR_INVALID_ARG, "%s",
                       _("Missing or invalid auth pointer"));
        return VIR_DRV_OPEN_ERROR;
    }

    /* Allocate per-connection private data */
    if (VIR_ALLOC(priv) < 0)
        goto cleanup;

    if (hypervParseUri(&priv->parsedUri, conn->uri) < 0)
        goto cleanup;

    /* Set the port dependent on the transport protocol if no port is
     * specified. This allows us to rely on the port parameter being
     * correctly set when building URIs later on, without the need to
     * distinguish between the situations port == 0 and port != 0 */
    if (conn->uri->port == 0) {
        if (STRCASEEQ(priv->parsedUri->transport, "https")) {
            conn->uri->port = 5986;
        } else {
            conn->uri->port = 5985;
        }
    }

    /* Request credentials */
    if (conn->uri->user != NULL) {
        if (VIR_STRDUP(username, conn->uri->user) < 0)
            goto cleanup;
    } else {
        username = virAuthGetUsername(conn, auth, "hyperv", "administrator", conn->uri->server);

        if (username == NULL) {
            virReportError(VIR_ERR_AUTH_FAILED, "%s", _("Username request failed"));
            goto cleanup;
        }
    }

    password = virAuthGetPassword(conn, auth, "hyperv", username, conn->uri->server);

    if (password == NULL) {
        virReportError(VIR_ERR_AUTH_FAILED, "%s", _("Password request failed"));
        goto cleanup;
    }

    /* Initialize the openwsman connection */
    priv->client = wsmc_create(conn->uri->server, conn->uri->port, "/wsman",
                               priv->parsedUri->transport, username, password);

    if (priv->client == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Could not create openwsman client"));
        goto cleanup;
    }

    if (wsmc_transport_init(priv->client, NULL) != 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                       _("Could not initialize openwsman transport"));
        goto cleanup;
    }

    /* FIXME: Currently only basic authentication is supported  */
    wsman_transport_set_auth_method(priv->client, "basic");

    /* Check if the connection can be established and if the server has the
     * Hyper-V role installed. If the call to hypervGetMsvmComputerSystemList
     * succeeds than the connection has been established. If the returned list
     * is empty than the server isn't a Hyper-V server. */
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_PHYSICAL);

    if (hypervGetMsvmComputerSystemList(priv, &query, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("%s is not a Hyper-V server"), conn->uri->server);
        goto cleanup;
    }

    conn->privateData = priv;
    priv = NULL;
    result = VIR_DRV_OPEN_SUCCESS;

 cleanup:
    hypervFreePrivate(&priv);
    VIR_FREE(username);
    VIR_FREE(password);
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervConnectClose(virConnectPtr conn)
{
    hypervPrivate *priv = conn->privateData;

    hypervFreePrivate(&priv);

    conn->privateData = NULL;

    return 0;
}



static const char *
hypervConnectGetType(virConnectPtr conn ATTRIBUTE_UNUSED)
{
    return "Hyper-V";
}



static char *
hypervConnectGetHostname(virConnectPtr conn)
{
    char *hostname = NULL;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Win32_ComputerSystem *computerSystem = NULL;

    virBufferAddLit(&query, WIN32_COMPUTERSYSTEM_WQL_SELECT);

    if (hypervGetWin32ComputerSystemList(priv, &query, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s"),
                       "Win32_ComputerSystem");
        goto cleanup;
    }

    ignore_value(VIR_STRDUP(hostname, computerSystem->data->DNSHostName));

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return hostname;
}



static int
hypervNodeGetInfo(virConnectPtr conn, virNodeInfoPtr info)
{
    int result = -1;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Win32_ComputerSystem *computerSystem = NULL;
    Win32_Processor *processorList = NULL;
    Win32_Processor *processor = NULL;
    char *tmp;

    memset(info, 0, sizeof(*info));

    virBufferAddLit(&query, WIN32_COMPUTERSYSTEM_WQL_SELECT);

    /* Get Win32_ComputerSystem */
    if (hypervGetWin32ComputerSystemList(priv, &query, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s"),
                       "Win32_ComputerSystem");
        goto cleanup;
    }

    /* Get Win32_Processor list */
    virBufferAsprintf(&query,
                      "associators of "
                      "{Win32_ComputerSystem.Name=\"%s\"} "
                      "where AssocClass = Win32_ComputerSystemProcessor "
                      "ResultClass = Win32_Processor",
                      computerSystem->data->Name);

    if (hypervGetWin32ProcessorList(priv, &query, &processorList) < 0)
        goto cleanup;

    if (processorList == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s"),
                       "Win32_Processor");
        goto cleanup;
    }

    /* Strip the string to fit more relevant information in 32 chars */
    tmp = processorList->data->Name;

    while (*tmp != '\0') {
        if (STRPREFIX(tmp, "  ")) {
            memmove(tmp, tmp + 1, strlen(tmp + 1) + 1);
            continue;
        } else if (STRPREFIX(tmp, "(R)") || STRPREFIX(tmp, "(C)")) {
            memmove(tmp, tmp + 3, strlen(tmp + 3) + 1);
            continue;
        } else if (STRPREFIX(tmp, "(TM)")) {
            memmove(tmp, tmp + 4, strlen(tmp + 4) + 1);
            continue;
        }

        ++tmp;
    }

    /* Fill struct */
    if (virStrncpy(info->model, processorList->data->Name,
                   sizeof(info->model) - 1, sizeof(info->model)) == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("CPU model %s too long for destination"),
                       processorList->data->Name);
        goto cleanup;
    }

    info->memory = computerSystem->data->TotalPhysicalMemory / 1024; /* byte to kilobyte */
    info->mhz = processorList->data->MaxClockSpeed;
    info->nodes = 1;
    info->sockets = 0;

    for (processor = processorList; processor != NULL;
         processor = processor->next) {
        ++info->sockets;
    }

    info->cores = processorList->data->NumberOfCores;
    info->threads = info->cores / processorList->data->NumberOfLogicalProcessors;
    info->cpus = info->sockets * info->cores;

    result = 0;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);
    hypervFreeObject(priv, (hypervObject *)processorList);

    return result;
}



static int
hypervConnectListDomains(virConnectPtr conn, int *ids, int maxids)
{
    bool success = false;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystemList = NULL;
    Msvm_ComputerSystem *computerSystem = NULL;
    int count = 0;

    if (maxids == 0)
        return 0;

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
    virBufferAddLit(&query, "and ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_ACTIVE);

    if (hypervGetMsvmComputerSystemList(priv, &query,
                                        &computerSystemList) < 0) {
        goto cleanup;
    }

    for (computerSystem = computerSystemList; computerSystem != NULL;
         computerSystem = computerSystem->next) {
        ids[count++] = computerSystem->data->ProcessID;

        if (count >= maxids)
            break;
    }

    success = true;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystemList);

    return success ? count : -1;
}



static int
hypervConnectNumOfDomains(virConnectPtr conn)
{
    bool success = false;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystemList = NULL;
    Msvm_ComputerSystem *computerSystem = NULL;
    int count = 0;

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
    virBufferAddLit(&query, "and ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_ACTIVE);

    if (hypervGetMsvmComputerSystemList(priv, &query,
                                        &computerSystemList) < 0) {
        goto cleanup;
    }

    for (computerSystem = computerSystemList; computerSystem != NULL;
         computerSystem = computerSystem->next) {
        ++count;
    }

    success = true;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystemList);

    return success ? count : -1;
}



static virDomainPtr
hypervDomainLookupByID(virConnectPtr conn, int id)
{
    virDomainPtr domain = NULL;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystem = NULL;

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
    virBufferAsprintf(&query, "and ProcessID = %d", id);

    if (hypervGetMsvmComputerSystemList(priv, &query, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem == NULL) {
        virReportError(VIR_ERR_NO_DOMAIN, _("No domain with ID %d"), id);
        goto cleanup;
    }

    hypervMsvmComputerSystemToDomain(conn, computerSystem, &domain);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return domain;
}



static virDomainPtr
hypervDomainLookupByUUID(virConnectPtr conn, const unsigned char *uuid)
{
    virDomainPtr domain = NULL;
    hypervPrivate *priv = conn->privateData;
    char uuid_string[VIR_UUID_STRING_BUFLEN];
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystem = NULL;

    virUUIDFormat(uuid, uuid_string);

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
    virBufferAsprintf(&query, "and Name = \"%s\"", uuid_string);

    if (hypervGetMsvmComputerSystemList(priv, &query, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem == NULL) {
        virReportError(VIR_ERR_NO_DOMAIN,
                       _("No domain with UUID %s"), uuid_string);
        goto cleanup;
    }

    hypervMsvmComputerSystemToDomain(conn, computerSystem, &domain);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return domain;
}



static virDomainPtr
hypervDomainLookupByName(virConnectPtr conn, const char *name)
{
    virDomainPtr domain = NULL;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystem = NULL;

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
    virBufferAsprintf(&query, "and ElementName = \"%s\"", name);

    if (hypervGetMsvmComputerSystemList(priv, &query, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem == NULL) {
        virReportError(VIR_ERR_NO_DOMAIN,
                       _("No domain with name %s"), name);
        goto cleanup;
    }

    hypervMsvmComputerSystemToDomain(conn, computerSystem, &domain);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return domain;
}



static int
hypervDomainSuspend(virDomainPtr domain)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem->data->EnabledState !=
        MSVM_COMPUTERSYSTEM_ENABLEDSTATE_ENABLED) {
        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                       _("Domain is not active"));
        goto cleanup;
    }

    result = hypervInvokeMsvmComputerSystemRequestStateChange
               (domain, MSVM_COMPUTERSYSTEM_REQUESTEDSTATE_PAUSED);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervDomainResume(virDomainPtr domain)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem->data->EnabledState !=
        MSVM_COMPUTERSYSTEM_ENABLEDSTATE_PAUSED) {
        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                       _("Domain is not paused"));
        goto cleanup;
    }

    result = hypervInvokeMsvmComputerSystemRequestStateChange
               (domain, MSVM_COMPUTERSYSTEM_REQUESTEDSTATE_ENABLED);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervDomainDestroyFlags(virDomainPtr domain, unsigned int flags)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;
    bool in_transition = false;

    virCheckFlags(0, -1);

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    if (!hypervIsMsvmComputerSystemActive(computerSystem, &in_transition) ||
        in_transition) {
        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                       _("Domain is not active or is in state transition"));
        goto cleanup;
    }

    result = hypervInvokeMsvmComputerSystemRequestStateChange
               (domain, MSVM_COMPUTERSYSTEM_REQUESTEDSTATE_DISABLED);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervDomainDestroy(virDomainPtr domain)
{
    return hypervDomainDestroyFlags(domain, 0);
}



static char *
hypervDomainGetOSType(virDomainPtr domain ATTRIBUTE_UNUSED)
{
    char *osType;

    ignore_value(VIR_STRDUP(osType, "hvm"));
    return osType;
}



static int
hypervDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    char uuid_string[VIR_UUID_STRING_BUFLEN];
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystem = NULL;
    Msvm_VirtualSystemSettingData *virtualSystemSettingData = NULL;
    Msvm_ProcessorSettingData *processorSettingData = NULL;
    Msvm_MemorySettingData *memorySettingData = NULL;

    memset(info, 0, sizeof(*info));

    virUUIDFormat(domain->uuid, uuid_string);

    /* Get Msvm_ComputerSystem */
    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    /* Get Msvm_VirtualSystemSettingData */
    virBufferAsprintf(&query,
                      "associators of "
                      "{Msvm_ComputerSystem.CreationClassName=\"Msvm_ComputerSystem\","
                      "Name=\"%s\"} "
                      "where AssocClass = Msvm_SettingsDefineState "
                      "ResultClass = Msvm_VirtualSystemSettingData",
                      uuid_string);

    if (hypervGetMsvmVirtualSystemSettingDataList(priv, &query,
                                                  &virtualSystemSettingData) < 0) {
        goto cleanup;
    }

    if (virtualSystemSettingData == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s for domain %s"),
                       "Msvm_VirtualSystemSettingData",
                       computerSystem->data->ElementName);
        goto cleanup;
    }

    /* Get Msvm_ProcessorSettingData */
    virBufferAsprintf(&query,
                      "associators of "
                      "{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
                      "where AssocClass = Msvm_VirtualSystemSettingDataComponent "
                      "ResultClass = Msvm_ProcessorSettingData",
                      virtualSystemSettingData->data->InstanceID);

    if (hypervGetMsvmProcessorSettingDataList(priv, &query,
                                              &processorSettingData) < 0) {
        goto cleanup;
    }

    if (processorSettingData == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s for domain %s"),
                       "Msvm_ProcessorSettingData",
                       computerSystem->data->ElementName);
        goto cleanup;
    }

    /* Get Msvm_MemorySettingData */
    virBufferAsprintf(&query,
                      "associators of "
                      "{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
                      "where AssocClass = Msvm_VirtualSystemSettingDataComponent "
                      "ResultClass = Msvm_MemorySettingData",
                      virtualSystemSettingData->data->InstanceID);

    if (hypervGetMsvmMemorySettingDataList(priv, &query,
                                           &memorySettingData) < 0) {
        goto cleanup;
    }


    if (memorySettingData == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s for domain %s"),
                       "Msvm_MemorySettingData",
                       computerSystem->data->ElementName);
        goto cleanup;
    }

    /* Fill struct */
    info->state = hypervMsvmComputerSystemEnabledStateToDomainState(computerSystem);
    info->maxMem = memorySettingData->data->Limit * 1024; /* megabyte to kilobyte */
    info->memory = memorySettingData->data->VirtualQuantity * 1024; /* megabyte to kilobyte */
    info->nrVirtCpu = processorSettingData->data->VirtualQuantity;
    info->cpuTime = 0;

    result = 0;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);
    hypervFreeObject(priv, (hypervObject *)virtualSystemSettingData);
    hypervFreeObject(priv, (hypervObject *)processorSettingData);
    hypervFreeObject(priv, (hypervObject *)memorySettingData);

    return result;
}



static int
hypervDomainGetState(virDomainPtr domain, int *state, int *reason,
                     unsigned int flags)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;

    virCheckFlags(0, -1);

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    *state = hypervMsvmComputerSystemEnabledStateToDomainState(computerSystem);

    if (reason != NULL)
        *reason = 0;

    result = 0;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static char *
hypervDomainGetXMLDesc(virDomainPtr domain, unsigned int flags)
{
    char *xml = NULL;
    hypervPrivate *priv = domain->conn->privateData;
    virDomainDefPtr def = NULL;
    char uuid_string[VIR_UUID_STRING_BUFLEN];
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystem = NULL;
    Msvm_VirtualSystemSettingData *virtualSystemSettingData = NULL;
    Msvm_ProcessorSettingData *processorSettingData = NULL;
    Msvm_MemorySettingData *memorySettingData = NULL;

    /* Flags checked by virDomainDefFormat */

    if (!(def = virDomainDefNew()))
        goto cleanup;

    virUUIDFormat(domain->uuid, uuid_string);

    /* Get Msvm_ComputerSystem */
    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    /* Get Msvm_VirtualSystemSettingData */
    virBufferAsprintf(&query,
                      "associators of "
                      "{Msvm_ComputerSystem.CreationClassName=\"Msvm_ComputerSystem\","
                      "Name=\"%s\"} "
                      "where AssocClass = Msvm_SettingsDefineState "
                      "ResultClass = Msvm_VirtualSystemSettingData",
                      uuid_string);

    if (hypervGetMsvmVirtualSystemSettingDataList(priv, &query,
                                                  &virtualSystemSettingData) < 0) {
        goto cleanup;
    }

    if (virtualSystemSettingData == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s for domain %s"),
                       "Msvm_VirtualSystemSettingData",
                       computerSystem->data->ElementName);
        goto cleanup;
    }

    /* Get Msvm_ProcessorSettingData */
    virBufferAsprintf(&query,
                      "associators of "
                      "{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
                      "where AssocClass = Msvm_VirtualSystemSettingDataComponent "
                      "ResultClass = Msvm_ProcessorSettingData",
                      virtualSystemSettingData->data->InstanceID);

    if (hypervGetMsvmProcessorSettingDataList(priv, &query,
                                              &processorSettingData) < 0) {
        goto cleanup;
    }

    if (processorSettingData == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s for domain %s"),
                       "Msvm_ProcessorSettingData",
                       computerSystem->data->ElementName);
        goto cleanup;
    }

    /* Get Msvm_MemorySettingData */
    virBufferAsprintf(&query,
                      "associators of "
                      "{Msvm_VirtualSystemSettingData.InstanceID=\"%s\"} "
                      "where AssocClass = Msvm_VirtualSystemSettingDataComponent "
                      "ResultClass = Msvm_MemorySettingData",
                      virtualSystemSettingData->data->InstanceID);

    if (hypervGetMsvmMemorySettingDataList(priv, &query,
                                           &memorySettingData) < 0) {
        goto cleanup;
    }


    if (memorySettingData == NULL) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not lookup %s for domain %s"),
                       "Msvm_MemorySettingData",
                       computerSystem->data->ElementName);
        goto cleanup;
    }

    /* Fill struct */
    def->virtType = VIR_DOMAIN_VIRT_HYPERV;

    if (hypervIsMsvmComputerSystemActive(computerSystem, NULL)) {
        def->id = computerSystem->data->ProcessID;
    } else {
        def->id = -1;
    }

    if (virUUIDParse(computerSystem->data->Name, def->uuid) < 0) {
        virReportError(VIR_ERR_INTERNAL_ERROR,
                       _("Could not parse UUID from string '%s'"),
                       computerSystem->data->Name);
        return NULL;
    }

    if (VIR_STRDUP(def->name, computerSystem->data->ElementName) < 0)
        goto cleanup;

    if (VIR_STRDUP(def->description, virtualSystemSettingData->data->Notes) < 0)
        goto cleanup;

    virDomainDefSetMemoryTotal(def, memorySettingData->data->Limit * 1024); /* megabyte to kilobyte */
    def->mem.cur_balloon = memorySettingData->data->VirtualQuantity * 1024; /* megabyte to kilobyte */

    def->vcpus = processorSettingData->data->VirtualQuantity;
    def->maxvcpus = processorSettingData->data->VirtualQuantity;
    def->os.type = VIR_DOMAIN_OSTYPE_HVM;

    /* FIXME: devices section is totally missing */

    xml = virDomainDefFormat(def,
                             virDomainDefFormatConvertXMLFlags(flags));

 cleanup:
    virDomainDefFree(def);
    hypervFreeObject(priv, (hypervObject *)computerSystem);
    hypervFreeObject(priv, (hypervObject *)virtualSystemSettingData);
    hypervFreeObject(priv, (hypervObject *)processorSettingData);
    hypervFreeObject(priv, (hypervObject *)memorySettingData);

    return xml;
}



static int
hypervConnectListDefinedDomains(virConnectPtr conn, char **const names, int maxnames)
{
    bool success = false;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystemList = NULL;
    Msvm_ComputerSystem *computerSystem = NULL;
    int count = 0;
    size_t i;

    if (maxnames == 0)
        return 0;

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
    virBufferAddLit(&query, "and ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_INACTIVE);

    if (hypervGetMsvmComputerSystemList(priv, &query,
                                        &computerSystemList) < 0) {
        goto cleanup;
    }

    for (computerSystem = computerSystemList; computerSystem != NULL;
         computerSystem = computerSystem->next) {
        if (VIR_STRDUP(names[count], computerSystem->data->ElementName) < 0)
            goto cleanup;

        ++count;

        if (count >= maxnames)
            break;
    }

    success = true;

 cleanup:
    if (!success) {
        for (i = 0; i < count; ++i)
            VIR_FREE(names[i]);

        count = -1;
    }

    hypervFreeObject(priv, (hypervObject *)computerSystemList);

    return count;
}



static int
hypervConnectNumOfDefinedDomains(virConnectPtr conn)
{
    bool success = false;
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystemList = NULL;
    Msvm_ComputerSystem *computerSystem = NULL;
    int count = 0;

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);
    virBufferAddLit(&query, "and ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_INACTIVE);

    if (hypervGetMsvmComputerSystemList(priv, &query,
                                        &computerSystemList) < 0) {
        goto cleanup;
    }

    for (computerSystem = computerSystemList; computerSystem != NULL;
         computerSystem = computerSystem->next) {
        ++count;
    }

    success = true;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystemList);

    return success ? count : -1;
}



static int
hypervDomainCreateWithFlags(virDomainPtr domain, unsigned int flags)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;

    virCheckFlags(0, -1);

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    if (hypervIsMsvmComputerSystemActive(computerSystem, NULL)) {
        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                       _("Domain is already active or is in state transition"));
        goto cleanup;
    }

    result = hypervInvokeMsvmComputerSystemRequestStateChange
               (domain, MSVM_COMPUTERSYSTEM_REQUESTEDSTATE_ENABLED);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervDomainCreate(virDomainPtr domain)
{
    return hypervDomainCreateWithFlags(domain, 0);
}



static int
hypervConnectIsEncrypted(virConnectPtr conn)
{
    hypervPrivate *priv = conn->privateData;

    if (STRCASEEQ(priv->parsedUri->transport, "https")) {
        return 1;
    } else {
        return 0;
    }
}



static int
hypervConnectIsSecure(virConnectPtr conn)
{
    hypervPrivate *priv = conn->privateData;

    if (STRCASEEQ(priv->parsedUri->transport, "https")) {
        return 1;
    } else {
        return 0;
    }
}



static int
hypervConnectIsAlive(virConnectPtr conn)
{
    hypervPrivate *priv = conn->privateData;

    /* XXX we should be able to do something better than this is simple, safe,
     * and good enough for now. In worst case, the function will return true
     * even though the connection is not alive.
     */
    if (priv->client)
        return 1;
    else
        return 0;
}



static int
hypervDomainIsActive(virDomainPtr domain)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    result = hypervIsMsvmComputerSystemActive(computerSystem, NULL) ? 1 : 0;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervDomainIsPersistent(virDomainPtr domain ATTRIBUTE_UNUSED)
{
    /* Hyper-V has no concept of transient domains, so all of them are persistent */
    return 1;
}



static int
hypervDomainIsUpdated(virDomainPtr domain ATTRIBUTE_UNUSED)
{
    return 0;
}



static int
hypervDomainManagedSave(virDomainPtr domain, unsigned int flags)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;
    bool in_transition = false;

    virCheckFlags(0, -1);

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    if (!hypervIsMsvmComputerSystemActive(computerSystem, &in_transition) ||
        in_transition) {
        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                       _("Domain is not active or is in state transition"));
        goto cleanup;
    }

    result = hypervInvokeMsvmComputerSystemRequestStateChange
               (domain, MSVM_COMPUTERSYSTEM_REQUESTEDSTATE_SUSPENDED);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervDomainHasManagedSaveImage(virDomainPtr domain, unsigned int flags)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;

    virCheckFlags(0, -1);

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    result = computerSystem->data->EnabledState ==
             MSVM_COMPUTERSYSTEM_ENABLEDSTATE_SUSPENDED ? 1 : 0;

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}



static int
hypervDomainManagedSaveRemove(virDomainPtr domain, unsigned int flags)
{
    int result = -1;
    hypervPrivate *priv = domain->conn->privateData;
    Msvm_ComputerSystem *computerSystem = NULL;

    virCheckFlags(0, -1);

    if (hypervMsvmComputerSystemFromDomain(domain, &computerSystem) < 0)
        goto cleanup;

    if (computerSystem->data->EnabledState !=
        MSVM_COMPUTERSYSTEM_ENABLEDSTATE_SUSPENDED) {
        virReportError(VIR_ERR_OPERATION_INVALID, "%s",
                       _("Domain has no managed save image"));
        goto cleanup;
    }

    result = hypervInvokeMsvmComputerSystemRequestStateChange
               (domain, MSVM_COMPUTERSYSTEM_REQUESTEDSTATE_DISABLED);

 cleanup:
    hypervFreeObject(priv, (hypervObject *)computerSystem);

    return result;
}


#define MATCH(FLAG) (flags & (FLAG))
static int
hypervConnectListAllDomains(virConnectPtr conn,
                            virDomainPtr **domains,
                            unsigned int flags)
{
    hypervPrivate *priv = conn->privateData;
    virBuffer query = VIR_BUFFER_INITIALIZER;
    Msvm_ComputerSystem *computerSystemList = NULL;
    Msvm_ComputerSystem *computerSystem = NULL;
    size_t ndoms;
    virDomainPtr domain;
    virDomainPtr *doms = NULL;
    int count = 0;
    int ret = -1;
    size_t i;

    virCheckFlags(VIR_CONNECT_LIST_DOMAINS_FILTERS_ALL, -1);

    /* check for filter combinations that return no results:
     * persistent: all hyperv guests are persistent
     * snapshot: the driver does not support snapshot management
     * autostart: the driver does not support autostarting guests
     */
    if ((MATCH(VIR_CONNECT_LIST_DOMAINS_TRANSIENT) &&
         !MATCH(VIR_CONNECT_LIST_DOMAINS_PERSISTENT)) ||
        (MATCH(VIR_CONNECT_LIST_DOMAINS_AUTOSTART) &&
         !MATCH(VIR_CONNECT_LIST_DOMAINS_NO_AUTOSTART)) ||
        (MATCH(VIR_CONNECT_LIST_DOMAINS_HAS_SNAPSHOT) &&
         !MATCH(VIR_CONNECT_LIST_DOMAINS_NO_SNAPSHOT))) {
        if (domains && VIR_ALLOC_N(*domains, 1) < 0)
            goto cleanup;

        ret = 0;
        goto cleanup;
    }

    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_SELECT);
    virBufferAddLit(&query, "where ");
    virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_VIRTUAL);

    /* construct query with filter depending on flags */
    if (!(MATCH(VIR_CONNECT_LIST_DOMAINS_ACTIVE) &&
          MATCH(VIR_CONNECT_LIST_DOMAINS_INACTIVE))) {
        if (MATCH(VIR_CONNECT_LIST_DOMAINS_ACTIVE)) {
            virBufferAddLit(&query, "and ");
            virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_ACTIVE);
        }

        if (MATCH(VIR_CONNECT_LIST_DOMAINS_INACTIVE)) {
            virBufferAddLit(&query, "and ");
            virBufferAddLit(&query, MSVM_COMPUTERSYSTEM_WQL_INACTIVE);
        }
    }

    if (hypervGetMsvmComputerSystemList(priv, &query,
                                        &computerSystemList) < 0)
        goto cleanup;

    if (domains) {
        if (VIR_ALLOC_N(doms, 1) < 0)
            goto cleanup;
        ndoms = 1;
    }

    for (computerSystem = computerSystemList; computerSystem != NULL;
         computerSystem = computerSystem->next) {

        /* filter by domain state */
        if (MATCH(VIR_CONNECT_LIST_DOMAINS_FILTERS_STATE)) {
            int st = hypervMsvmComputerSystemEnabledStateToDomainState(computerSystem);
            if (!((MATCH(VIR_CONNECT_LIST_DOMAINS_RUNNING) &&
                   st == VIR_DOMAIN_RUNNING) ||
                  (MATCH(VIR_CONNECT_LIST_DOMAINS_PAUSED) &&
                   st == VIR_DOMAIN_PAUSED) ||
                  (MATCH(VIR_CONNECT_LIST_DOMAINS_SHUTOFF) &&
                   st == VIR_DOMAIN_SHUTOFF) ||
                  (MATCH(VIR_CONNECT_LIST_DOMAINS_OTHER) &&
                   (st != VIR_DOMAIN_RUNNING &&
                    st != VIR_DOMAIN_PAUSED &&
                    st != VIR_DOMAIN_SHUTOFF))))
                continue;
        }

        /* managed save filter */
        if (MATCH(VIR_CONNECT_LIST_DOMAINS_FILTERS_MANAGEDSAVE)) {
            bool mansave = computerSystem->data->EnabledState ==
                           MSVM_COMPUTERSYSTEM_ENABLEDSTATE_SUSPENDED;

            if (!((MATCH(VIR_CONNECT_LIST_DOMAINS_MANAGEDSAVE) && mansave) ||
                  (MATCH(VIR_CONNECT_LIST_DOMAINS_NO_MANAGEDSAVE) && !mansave)))
                continue;
        }

        if (!doms) {
            count++;
            continue;
        }

        if (VIR_RESIZE_N(doms, ndoms, count, 2) < 0)
            goto cleanup;

        domain = NULL;

        if (hypervMsvmComputerSystemToDomain(conn, computerSystem,
                                             &domain) < 0)
            goto cleanup;

        doms[count++] = domain;
    }

    if (doms)
        *domains = doms;
    doms = NULL;
    ret = count;

 cleanup:
    if (doms) {
        for (i = 0; i < count; ++i)
            virObjectUnref(doms[i]);

        VIR_FREE(doms);
    }

    hypervFreeObject(priv, (hypervObject *)computerSystemList);

    return ret;
}
#undef MATCH




static virHypervisorDriver hypervHypervisorDriver = {
    .name = "Hyper-V",
    .connectOpen = hypervConnectOpen, /* 0.9.5 */
    .connectClose = hypervConnectClose, /* 0.9.5 */
    .connectGetType = hypervConnectGetType, /* 0.9.5 */
    .connectGetHostname = hypervConnectGetHostname, /* 0.9.5 */
    .nodeGetInfo = hypervNodeGetInfo, /* 0.9.5 */
    .connectListDomains = hypervConnectListDomains, /* 0.9.5 */
    .connectNumOfDomains = hypervConnectNumOfDomains, /* 0.9.5 */
    .connectListAllDomains = hypervConnectListAllDomains, /* 0.10.2 */
    .domainLookupByID = hypervDomainLookupByID, /* 0.9.5 */
    .domainLookupByUUID = hypervDomainLookupByUUID, /* 0.9.5 */
    .domainLookupByName = hypervDomainLookupByName, /* 0.9.5 */
    .domainSuspend = hypervDomainSuspend, /* 0.9.5 */
    .domainResume = hypervDomainResume, /* 0.9.5 */
    .domainDestroy = hypervDomainDestroy, /* 0.9.5 */
    .domainDestroyFlags = hypervDomainDestroyFlags, /* 0.9.5 */
    .domainGetOSType = hypervDomainGetOSType, /* 0.9.5 */
    .domainGetInfo = hypervDomainGetInfo, /* 0.9.5 */
    .domainGetState = hypervDomainGetState, /* 0.9.5 */
    .domainGetXMLDesc = hypervDomainGetXMLDesc, /* 0.9.5 */
    .connectListDefinedDomains = hypervConnectListDefinedDomains, /* 0.9.5 */
    .connectNumOfDefinedDomains = hypervConnectNumOfDefinedDomains, /* 0.9.5 */
    .domainCreate = hypervDomainCreate, /* 0.9.5 */
    .domainCreateWithFlags = hypervDomainCreateWithFlags, /* 0.9.5 */
    .connectIsEncrypted = hypervConnectIsEncrypted, /* 0.9.5 */
    .connectIsSecure = hypervConnectIsSecure, /* 0.9.5 */
    .domainIsActive = hypervDomainIsActive, /* 0.9.5 */
    .domainIsPersistent = hypervDomainIsPersistent, /* 0.9.5 */
    .domainIsUpdated = hypervDomainIsUpdated, /* 0.9.5 */
    .domainManagedSave = hypervDomainManagedSave, /* 0.9.5 */
    .domainHasManagedSaveImage = hypervDomainHasManagedSaveImage, /* 0.9.5 */
    .domainManagedSaveRemove = hypervDomainManagedSaveRemove, /* 0.9.5 */
    .connectIsAlive = hypervConnectIsAlive, /* 0.9.8 */
};



static void
hypervDebugHandler(const char *message, debug_level_e level,
                   void *user_data ATTRIBUTE_UNUSED)
{
    switch (level) {
      case DEBUG_LEVEL_ERROR:
      case DEBUG_LEVEL_CRITICAL:
        VIR_ERROR(_("openwsman error: %s"), message);
        break;

      case DEBUG_LEVEL_WARNING:
        VIR_WARN("openwsman warning: %s", message);
        break;

      default:
        /* Ignore the rest */
        break;
    }
}


static virConnectDriver hypervConnectDriver = {
    .hypervisorDriver = &hypervHypervisorDriver,
};

int
hypervRegister(void)
{
    /* Forward openwsman errors and warnings to libvirt's logging */
    debug_add_handler(hypervDebugHandler, DEBUG_LEVEL_WARNING, NULL);

    return virRegisterConnectDriver(&hypervConnectDriver,
                                    false);
}