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Re: [libvirt] [PATCH v2] conf: Generate address for scsi host device automatically



On 05/23/2013 12:48 PM, Osier Yang wrote:
> With unknown good reasons, the attribute "bus" of scsi device
> address is always set to 0, same for attribute "target". (See
> virDomainDiskDefAssignAddress).
> 
> Though we might need to change the algorithm to honor "bus"
> and "target" too, that's a different issue. The address generator
> 
> for scsi host device in this patch just follows the unknown
> good reasons, only considering the "controller" and "unit".
> It walks through all scsi controllers and their units, to see
> if the address $controller:0:0:$unit can be used, if found
> one, it sits on it, otherwise, it creates a new controller
> (actually the controller is implicitly created by someone
> else), and sits on $new_controller:0:0:0 instead.
> 
> ---
> v1 - v2:
>   * A new helper virDomainSCSIDriveAddressIsUsed
>   * Move virDomainDefMaybeAddHostdevSCSIcontroller
>   * More comments
>   * Add testing.
>   * problems fixed with the testing:
>     1) s/nscsi_controllers + 1/nscsi_controllers/,
>     2) Add the controller implicitly after a scsi hostdev def
>        parsing, as it can use a new scsi controller index
>        (nscsi_controllers), which should be added implicitly.

First pass of code is found at:

https://www.redhat.com/archives/libvir-list/2013-May/msg00340.html

The previous/initial review and reply is found at:

https://www.redhat.com/archives/libvir-list/2013-May/msg00506.html

https://www.redhat.com/archives/libvir-list/2013-May/msg00526.html

> ---
>  src/conf/domain_conf.c                             | 209 ++++++++++++++++++---
>  .../qemuxml2argv-hostdev-scsi-autogen-address.xml  |  95 ++++++++++
>  ...qemuxml2xmlout-hostdev-scsi-autogen-address.xml | 106 +++++++++++
>  tests/qemuxml2xmltest.c                            |   2 +
>  4 files changed, 382 insertions(+), 30 deletions(-)
>  create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-autogen-address.xml
>  create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-hostdev-scsi-autogen-address.xml
> 
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index ad5550c..86d743b 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -3782,6 +3782,148 @@ cleanup:
>      return ret;
>  }
>  
> +/* Check if a drive type address $controller:0:0:$unit is already
> + * taken by a disk or not.
> + */
> +static bool
> +virDomainDriveAddressIsUsedByDisk(virDomainDefPtr def,
> +                                  enum virDomainDiskBus type,
> +                                  unsigned int controller,
> +                                  unsigned int unit)
> +{
> +    virDomainDiskDefPtr disk;
> +    int i;
> +
> +    for (i = 0; i < def->ndisks; i++) {
> +        disk = def->disks[i];
> +
> +        if (disk->bus != type ||
> +            disk->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE)
> +            continue;
> +
> +        if (disk->info.addr.drive.controller == controller &&
> +            disk->info.addr.drive.unit == unit &&
> +            disk->info.addr.drive.bus == 0 &&
> +            disk->info.addr.drive.target == 0)
> +            return true;
> +    }
> +
> +    return false;
> +}
> +
> +/* Check if a drive type address $controller:0:0:$unit is already
> + * taken by a host device or not.
> + */
> +static bool
> +virDomainDriveAddressIsUsedByHostdev(virDomainDefPtr def,
> +                                     enum virDomainHostdevSubsysType type,
> +                                     unsigned int controller,
> +                                     unsigned int unit)
> +{
> +    virDomainHostdevDefPtr hostdev;
> +    int i;
> +
> +    for (i = 0; i < def->nhostdevs; i++) {
> +        hostdev = def->hostdevs[i];
> +
> +        if (hostdev->source.subsys.type != type)
> +            continue;
> +
> +        if (hostdev->info->addr.drive.controller == controller &&
> +            hostdev->info->addr.drive.unit == unit &&
> +            hostdev->info->addr.drive.bus == 0 &&
> +            hostdev->info->addr.drive.target == 0)
> +            return true;
> +    }
> +
> +    return false;
> +}
> +
> +static bool
> +virDomainSCSIDriveAddressIsUsed(virDomainDefPtr def,
> +                                unsigned int controller,
> +                                unsigned int unit)
> +{
> +    /* In current implementation, the maximum unit number of a controller
> +     * is either 16 or 7 (narrow SCSI bus), and if the maximum unit number
> +     * is 16, the controller itself is on unit 7 */
> +    if (unit == 7)


FYI: The previous code cared that a wide address was being used when
returning true - this code doesn't.  Just making sure that change is
intentional.  Essentially, 7 cannot be used.  The comments above the
code talk about wide/narrow which it seems becomes irrelevant. The
reality seems to be that you are avoiding using 7 altogether because
it's reserved for the controller itself, correct?  Regardless of whether
a wide or narrow.  The controller itself uses the unit number of the
maximum value of the narrow band.  At least that's how I'm reading it.

> +        return true;
> +
> +    if (virDomainDriveAddressIsUsedByDisk(def, VIR_DOMAIN_DISK_BUS_SCSI,
> +                                          controller, unit) ||
> +        virDomainDriveAddressIsUsedByHostdev(def, VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI,
> +                                             controller, unit))
> +        return true;
> +
> +    return false;
> +}
> +
> +/* Find out the next usable "unit" of a specific controller */
> +static int
> +virDomainControllerSCSINextUnit(virDomainDefPtr def,
> +                                unsigned int max_unit,
> +                                unsigned int controller)
> +{
> +    int i;
> +
> +    for (i = 0; i < max_unit; i++) {
> +        if (!virDomainSCSIDriveAddressIsUsed(def, controller, i))
> +            return i;
> +    }
> +
> +    return -1;
> +}
> +
> +#define SCSI_WIDE_BUS_MAX_CONT_UNIT 16
> +#define SCSI_NARROW_BUS_MAX_CONT_UNIT 7
> +
> +static int
> +virDomainHostdevAssignAddress(virDomainXMLOptionPtr xmlopt,
> +                              virDomainDefPtr def,
> +                              virDomainHostdevDefPtr hostdev)
> +{
> +    int next_unit;
> +    unsigned nscsi_controllers = 0;
> +    bool found = false;
> +    int i;
> +
> +    if (hostdev->source.subsys.type != VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI)
> +        return -1;
> +
> +    for (i = 0; i < def->ncontrollers; i++) {

As a for loop exit condition, consider either using

                                         && !found
or

                                         && next_unit == -1

as long as you initialize next_unit = -1 above...

> +        if (def->controllers[i]->type != VIR_DOMAIN_CONTROLLER_TYPE_SCSI)
> +            continue;
> +
> +        nscsi_controllers++;
> +        next_unit = virDomainControllerSCSINextUnit(def,
> +                                                    xmlopt->config.hasWideScsiBus ?
> +                                                    SCSI_WIDE_BUS_MAX_CONT_UNIT :
> +                                                    SCSI_NARROW_BUS_MAX_CONT_UNIT,
> +                                                    def->controllers[i]->idx);
> +        if (next_unit >= 0) {
> +            found = true;
> +            break;

break; is irrelevant using !found in loop exit or the whole statement is
irrelevent if using next_unit == -1 for loop exit...

> +        }
> +    }
> +
> +    hostdev->info->type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_DRIVE;
> +
> +    if (found) {
> +        hostdev->info->addr.drive.controller = def->controllers[i]->idx;
> +        hostdev->info->addr.drive.bus = 0;
> +        hostdev->info->addr.drive.target = 0;
> +        hostdev->info->addr.drive.unit = next_unit;
> +    } else {
> +        hostdev->info->addr.drive.controller = nscsi_controllers;
> +        hostdev->info->addr.drive.bus = 0;
> +        hostdev->info->addr.drive.target = 0;
> +        hostdev->info->addr.drive.unit = 0;
> +    }


Although it looked odd initially, I think I convinced myself the logic
is OK. Initially, nscsi_controllers = 0;

If none exist, then 'controller = 0' and 'units' are assigned until
full, right? If one exists and is full, then 'controller = 1' and is
placed at unit = 0.

NOTE:
Using next_unit to break the loop means this code could be rewritten as:

hostdev->info->addr.drive.controller = (next_unit >= 0 ?
                                        def->controllers[i]->idx :
                                        nscsi_controllers)
hostdev->info->addr.drive.bus = 0;
hostdev->info->addr.drive.target = 0;
hostdev->info->addr.drive.unit = (next_unit >= 0 ? next_unit : 0);

Although one could argue setting "= 0;" is redundant due to allocation.



> +
> +    return 0;
> +}
> +
>  static int
>  virDomainHostdevDefParseXMLSubsys(xmlNodePtr node,
>                                    xmlXPathContextPtr ctxt,
> @@ -8802,7 +8944,9 @@ error:
>  }
>  
>  static virDomainHostdevDefPtr
> -virDomainHostdevDefParseXML(const xmlNodePtr node,
> +virDomainHostdevDefParseXML(virDomainXMLOptionPtr xmlopt,
> +                            virDomainDefPtr vmdef,
> +                            const xmlNodePtr node,
>                              xmlXPathContextPtr ctxt,
>                              virHashTablePtr bootHash,
>                              unsigned int flags)
> @@ -8862,7 +9006,9 @@ virDomainHostdevDefParseXML(const xmlNodePtr node,
>              }
>              break;
>          case VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI:
> -            if (def->info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE) {
> +            if (def->info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE &&
> +                virDomainHostdevAssignAddress(xmlopt, vmdef, def) < 0) {
> +
>                  virReportError(VIR_ERR_XML_ERROR, "%s",
>                                 _("SCSI host devices must have address specified"));
>                  goto error;
> @@ -9271,8 +9417,8 @@ virDomainDeviceDefParse(const char *xmlStr,
>              goto error;
>      } else if (xmlStrEqual(node->name, BAD_CAST "hostdev")) {
>          dev->type = VIR_DOMAIN_DEVICE_HOSTDEV;
> -        if (!(dev->data.hostdev = virDomainHostdevDefParseXML(node, ctxt, NULL,
> -                                                              flags)))
> +        if (!(dev->data.hostdev = virDomainHostdevDefParseXML(xmlopt, def, node,
> +                                                              ctxt, NULL, flags)))
>              goto error;
>      } else if (xmlStrEqual(node->name, BAD_CAST "controller")) {
>          dev->type = VIR_DOMAIN_DEVICE_CONTROLLER;
> @@ -10255,6 +10401,30 @@ error:
>      return NULL;
>  }
>  
> +static int
> +virDomainDefMaybeAddHostdevSCSIcontroller(virDomainDefPtr def)
> +{
> +    /* Look for any hostdev scsi dev */
> +    int i;
> +    int maxController = -1;
> +    virDomainHostdevDefPtr hostdev;
> +
> +    for (i = 0; i < def->nhostdevs; i++) {
> +        hostdev = def->hostdevs[i];
> +        if (hostdev->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS &&
> +            hostdev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI &&
> +            (int)hostdev->info->addr.drive.controller > maxController) {
> +            maxController = hostdev->info->addr.drive.controller;
> +        }
> +    }
> +
> +    for (i = 0; i <= maxController; i++) {
> +        if (virDomainDefMaybeAddController(def, VIR_DOMAIN_CONTROLLER_TYPE_SCSI, i, -1) < 0)
> +            return -1;
> +    }
> +
> +    return 0;
> +}
>  
>  static virDomainDefPtr
>  virDomainDefParseXML(xmlDocPtr xml,
> @@ -11618,7 +11788,8 @@ virDomainDefParseXML(xmlDocPtr xml,
>      for (i = 0; i < n; i++) {
>          virDomainHostdevDefPtr hostdev;
>  
> -        hostdev = virDomainHostdevDefParseXML(nodes[i], ctxt, bootHash, flags);
> +        hostdev = virDomainHostdevDefParseXML(xmlopt, def, nodes[i],
> +                                              ctxt, bootHash, flags);
>          if (!hostdev)
>              goto error;
>  
> @@ -11631,6 +11802,9 @@ virDomainDefParseXML(xmlDocPtr xml,
>          }
>  
>          def->hostdevs[def->nhostdevs++] = hostdev;
> +
> +        if (virDomainDefMaybeAddHostdevSCSIcontroller(def) < 0)
> +            goto error;
>      }
>      VIR_FREE(nodes);
>  
> @@ -13232,31 +13406,6 @@ virDomainDefMaybeAddSmartcardController(virDomainDefPtr def)
>      return 0;
>  }
>  
> -static int
> -virDomainDefMaybeAddHostdevSCSIcontroller(virDomainDefPtr def)
> -{
> -    /* Look for any hostdev scsi dev */
> -    int i;
> -    int maxController = -1;
> -    virDomainHostdevDefPtr hostdev;
> -
> -    for (i = 0; i < def->nhostdevs; i++) {
> -        hostdev = def->hostdevs[i];
> -        if (hostdev->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS &&
> -            hostdev->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI &&
> -            (int)hostdev->info->addr.drive.controller > maxController) {
> -            maxController = hostdev->info->addr.drive.controller;
> -        }
> -    }
> -
> -    for (i = 0; i <= maxController; i++) {
> -        if (virDomainDefMaybeAddController(def, VIR_DOMAIN_CONTROLLER_TYPE_SCSI, i, -1) < 0)
> -            return -1;
> -    }
> -
> -    return 0;
> -}
> -
>  /*
>   * Based on the declared <address/> info for any devices,
>   * add necessary drive controllers which are not already present
> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-autogen-address.xml b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-autogen-address.xml
> new file mode 100644
> index 0000000..21f112b
> --- /dev/null
> +++ b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-autogen-address.xml
> @@ -0,0 +1,95 @@
> +<domain type='qemu'>
> +  <name>QEMUGuest2</name>
> +  <uuid>c7a5fdbd-edaf-9466-926a-d65c16db1809</uuid>
> +  <memory unit='KiB'>219100</memory>
> +  <currentMemory unit='KiB'>219100</currentMemory>
> +  <vcpu placement='static'>1</vcpu>
> +  <os>
> +    <type arch='i686' machine='pc'>hvm</type>
> +    <boot dev='hd'/>
> +  </os>
> +  <clock offset='utc'/>
> +  <on_poweroff>destroy</on_poweroff>
> +  <on_reboot>restart</on_reboot>
> +  <on_crash>destroy</on_crash>
> +  <devices>
> +    <emulator>/usr/bin/qemu</emulator>
> +    <disk type='block' device='disk'>
> +      <source dev='/dev/HostVG/QEMUGuest2'/>
> +      <target dev='hda' bus='ide'/>
> +      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> +    </disk>
> +    <controller type='scsi' index='0' model='virtio-scsi'/>
> +    <controller type='usb' index='0'/>
> +    <controller type='ide' index='0'/>
> +    <controller type='pci' index='0' model='pci-root'/>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host0'/>
> +        <address bus='0' target='0' unit='0'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host1'/>
> +        <address bus='0' target='0' unit='1'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host2'/>
> +        <address bus='0' target='0' unit='2'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host3'/>
> +        <address bus='0' target='0' unit='3'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host4'/>
> +        <address bus='0' target='0' unit='4'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host5'/>
> +        <address bus='0' target='0' unit='5'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host6'/>
> +        <address bus='0' target='0' unit='6'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host7'/>
> +        <address bus='0' target='0' unit='7'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host8'/>
> +        <address bus='0' target='0' unit='8'/>
> +      </source>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host9'/>
> +        <address bus='0' target='0' unit='9'/>
> +      </source>
> +      <address type='drive' controller='1' bus='0' target='0' unit='5'/>

[1] see below

> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host10'/>
> +        <address bus='0' target='0' unit='10'/>
> +      </source>
> +    </hostdev>
> +    <memballoon model='virtio'/>
> +  </devices>
> +</domain>
> diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-hostdev-scsi-autogen-address.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-hostdev-scsi-autogen-address.xml
> new file mode 100644
> index 0000000..e416654
> --- /dev/null
> +++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-hostdev-scsi-autogen-address.xml
> @@ -0,0 +1,106 @@
> +<domain type='qemu'>
> +  <name>QEMUGuest2</name>
> +  <uuid>c7a5fdbd-edaf-9466-926a-d65c16db1809</uuid>
> +  <memory unit='KiB'>219100</memory>
> +  <currentMemory unit='KiB'>219100</currentMemory>
> +  <vcpu placement='static'>1</vcpu>
> +  <os>
> +    <type arch='i686' machine='pc'>hvm</type>
> +    <boot dev='hd'/>
> +  </os>
> +  <clock offset='utc'/>
> +  <on_poweroff>destroy</on_poweroff>
> +  <on_reboot>restart</on_reboot>
> +  <on_crash>destroy</on_crash>
> +  <devices>
> +    <emulator>/usr/bin/qemu</emulator>
> +    <disk type='block' device='disk'>
> +      <source dev='/dev/HostVG/QEMUGuest2'/>
> +      <target dev='hda' bus='ide'/>
> +      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> +    </disk>
> +    <controller type='scsi' index='0' model='virtio-scsi'/>
> +    <controller type='usb' index='0'/>
> +    <controller type='ide' index='0'/>
> +    <controller type='pci' index='0' model='pci-root'/>
> +    <controller type='scsi' index='1'/>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host0'/>
> +        <address bus='0' target='0' unit='0'/>
> +      </source>
> +      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host1'/>
> +        <address bus='0' target='0' unit='1'/>
> +      </source>
> +      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host2'/>
> +        <address bus='0' target='0' unit='2'/>
> +      </source>
> +      <address type='drive' controller='0' bus='0' target='0' unit='2'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host3'/>
> +        <address bus='0' target='0' unit='3'/>
> +      </source>
> +      <address type='drive' controller='0' bus='0' target='0' unit='3'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host4'/>
> +        <address bus='0' target='0' unit='4'/>
> +      </source>
> +      <address type='drive' controller='0' bus='0' target='0' unit='4'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host5'/>
> +        <address bus='0' target='0' unit='5'/>
> +      </source>
> +      <address type='drive' controller='0' bus='0' target='0' unit='5'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host6'/>
> +        <address bus='0' target='0' unit='6'/>
> +      </source>
> +      <address type='drive' controller='0' bus='0' target='0' unit='6'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host7'/>
> +        <address bus='0' target='0' unit='7'/>
> +      </source>
> +      <address type='drive' controller='1' bus='0' target='0' unit='0'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host8'/>
> +        <address bus='0' target='0' unit='8'/>
> +      </source>
> +      <address type='drive' controller='1' bus='0' target='0' unit='1'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host9'/>
> +        <address bus='0' target='0' unit='9'/>
> +      </source>
> +      <address type='drive' controller='1' bus='0' target='0' unit='5'/>
> +    </hostdev>
> +    <hostdev mode='subsystem' type='scsi' managed='yes'>
> +      <source>
> +        <adapter name='scsi_host10'/>
> +        <address bus='0' target='0' unit='10'/>
> +      </source>
> +      <address type='drive' controller='1' bus='0' target='0' unit='2'/>
> +    </hostdev>
> +    <memballoon model='virtio'/>
> +  </devices>
> +</domain>
> diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
> index 64a271c..06e4206 100644
> --- a/tests/qemuxml2xmltest.c
> +++ b/tests/qemuxml2xmltest.c
> @@ -298,6 +298,8 @@ mymain(void)
>      DO_TEST("hostdev-scsi-shareable");
>      DO_TEST("hostdev-scsi-sgio");
>  
> +    DO_TEST_DIFFERENT("hostdev-scsi-autogen-address");
> +

[1]
Still don't understand the test setup 100%, but I think for the purposes
of what you're trying to prove that the defined unit=5 above should be 1
or 2 and then ensure that '3' gets created to prove the algorithm will
find one at '1' or '2'.  As it stands all that seems to be provided is
the scsi10 will use '3' even though '5' exists.

Curious to understand why the 2nd controller gets created without the
"model='virtio-scsi'"?  Does it matter? Does creating a controller on
the fly like this would seem to imply that the controllers would be alike.

Also what is the delineation between a narrow vs. wide bus in the xml?
It seems you'd want to have a test that ensures that a wide scsi bus
skips unit=7 when adding 10 devices, right?



John
>      virObjectUnref(driver.caps);
>      virObjectUnref(driver.xmlopt);
>  
> 


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