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qemu: re-add hostdev interfaces to hostdev array on libvirtd restart

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This resolves:

   https://bugzilla.redhat.com/show_bug.cgi?id=1045002

If a domain has an <interface type='hostdev'> or an <interface
type='network'> where the network itself is a pool of hostdev devices,
then libvirt will internally keep that device on both the interface
list *and* the hostdev list for the domain. One of the places this
comes in handy is when a new device is being added and libvirt wants
to find a unique "alias" name for it - it just scans through the
hostdev array and makes sure it picks a name that doesn't match the
alias of any device in that array.

However, when libvirtd was restarted, if there was an <interface
type='network'> with the network being a hostdev pool, the device
would not be added to the reconstructed internal hostdev array, so its
alias would not be found during a scan of the hostdev array, thus
attempts to add a new hostdev (or <interface type='hostdev'> or
<interface type='network'>) would result in a message like this:

internal error: unable to execute QEMU command 'device_add':
                Duplicate ID 'hostdev0' for device

This patch simply fixes the existing code in the domain XML parser
that fixes up the hostdev array in the case of <interface
type='hostdev'> to do the same thing in the case of <interface
type='network'> with a hostdev network.

This bug has existed since the very first addition of hostdev networks
to libvirt (0.10.0).
This commit is contained in:
Laine Stump 2013-12-19 14:44:03 +02:00
parent c0f511ee2b
commit 8700b87800
1 changed files with 6 additions and 3 deletions
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9
src/conf/domain_conf.c
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@ -12101,9 +12101,12 @@ virDomainDefParseXML(xmlDocPtr xml,
def->nets[def->nnets++] = net;
/* <interface type='hostdev'> must also be in the hostdevs array */
if (net->type == VIR_DOMAIN_NET_TYPE_HOSTDEV &&
virDomainHostdevInsert(def, &net->data.hostdev.def) < 0) {
/* <interface type='hostdev'> (and <interface type='net'>
* where the actual network type is already known to be
* hostdev) must also be in the hostdevs array.
*/
if (virDomainNetGetActualType(net) == VIR_DOMAIN_NET_TYPE_HOSTDEV &&
virDomainHostdevInsert(def, virDomainNetGetActualHostdev(net)) < 0) {
goto error;
}
}