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Re: [libvirt] [PATCHv5 3/3] libvirt/qemu - support support persistent modification of qemu interfaces



On Mon, 21 Mar 2011 16:48:23 +0800
Wen Congyang <wency cn fujitsu com> wrote:

> At 03/16/2011 02:46 PM, KAMEZAWA Hiroyuki Write:
> >>From d69f7c07571c8adfc7720aab77aa1f103eb6e95b Mon Sep 17 00:00:00 2001
> > From: KAMEZAWA Hiroyuki <kamezawa hiroyu jp fujitsu com>
> > Date: Wed, 16 Mar 2011 15:39:14 +0900
> > Subject: [PATCHv5 3/3] libvirt/qemu - support support persistent modification of qemu interfaces.
> > 
> >  support changes of interfaces by VIR_DOMAIN_DEVICE_MODIFY_CONFIG
> >  for qemu.
> > 
> >  Changelog v4->v5
> >    - fixed mac handling.
> >    - moved some functions to domain_conf.c
> >    - clean up.
> > 
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa hiroyu jp fujitsu com>
> > ---
> >  src/conf/domain_conf.c   |   56 ++++++++++++++++++++++++++++++++++++++++++++++
> >  src/conf/domain_conf.h   |    5 ++++
> >  src/libvirt_private.syms |    4 +++
> >  src/qemu/qemu_driver.c   |   38 +++++++++++++++++++++++++++++++
> >  4 files changed, 103 insertions(+), 0 deletions(-)
> > 
> > diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> > index 1d39481..9e4dea6 100644
> > --- a/src/conf/domain_conf.c
> > +++ b/src/conf/domain_conf.c
> > @@ -4952,6 +4952,62 @@ int virDomainDiskRemoveByName(virDomainDefPtr def, const char *name)
> >      return 0;
> >  }
> >  
> > +int virDomainNetInsert(virDomainDefPtr def, virDomainNetDefPtr net)
> > +{
> > +    if (VIR_REALLOC_N(def->nets, def->nnets) < 0)
> > +        return -1;
> > +    def->nets[def->nnets] = net;
> > +    def->nnets++;
> > +    return 0;
> > +}
> > +
> > +int virDomainNetIndexByMac(virDomainDefPtr def, const unsigned char*mac)
> > +{
> > +    int i;
> > +
> > +    for (i = 0; i < def->nnets; i++)
> > +        if (memcmp(def->nets[i]->mac, mac, VIR_MAC_BUFLEN))
> > +            return i;
> > +    return -1;
> > +}
> > +
> > +int virDomainNetIndexByIfname(virDomainDefPtr def, const char*name)
> > +{
> > +    int i;
> > +
> > +    for (i = 0; i < def->nnets; i++) {
> > +        if (def->nets[i]->ifname && STREQ(def->nets[i]->ifname, name))
> > +            return i;
> > +    }
> > +    return -1;
> > +}
> > +
> > +static void virDomainNetRemove(virDomainDefPtr def, size_t i)
> > +{
> > +    if (def->nnets > 1) {
> > +        memmove(def->nets + i,
> > +                def->nets + i + 1,
> > +                sizeof(*def->nets) * (def->nnets - (i + 1)));
> > +        def->nnets--;
> > +        if (VIR_REALLOC_N(def->nets, def->nnets) < 0) {
> > +            /* ignore harmless */
> > +        }
> > +    } else {
> > +        VIR_FREE(def->nets);
> > +        def->nnets = 0;
> > +    }
> > +}
> > +
> > +int virDomainNetRemoveByMac(virDomainDefPtr def, const unsigned char *mac)
> > +{
> > +    int i;
> > +
> > +    i = virDomainNetIndexByMac(def, mac);
> > +    if (i < 0)
> > +        return -1;
> > +    virDomainNetRemove(def, i);
> > +    return 0;
> > +}
> >  
> >  int virDomainControllerInsert(virDomainDefPtr def,
> >                                virDomainControllerDefPtr controller)
> > diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> > index 320ca13..d5154f6 100644
> > --- a/src/conf/domain_conf.h
> > +++ b/src/conf/domain_conf.h
> > @@ -1271,6 +1271,11 @@ int virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def);
> >  void virDomainDiskRemove(virDomainDefPtr def, size_t i);
> >  int virDomainDiskRemoveByName(virDomainDefPtr def, const char *name);
> >  
> > +int virDomainNetIndexByIfname(virDomainDefPtr def, const char *ifname);
> > +int virDomainNetIndexByMac(virDomainDefPtr def, const unsigned char *mac);
> > +int virDomainNetInsert(virDomainDefPtr dev, virDomainNetDefPtr net);
> > +int virDomainNetRemoveByMac(virDomainDefPtr def, const unsigned char *mac);
> > +
> >  int virDomainControllerInsert(virDomainDefPtr def,
> >                                virDomainControllerDefPtr controller);
> >  void virDomainControllerInsertPreAlloced(virDomainDefPtr def,
> > diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> > index 1761dfb..cdc63db 100644
> > --- a/src/libvirt_private.syms
> > +++ b/src/libvirt_private.syms
> > @@ -277,6 +277,10 @@ virDomainMemballoonModelTypeFromString;
> >  virDomainMemballoonModelTypeToString;
> >  virDomainNetDefFree;
> >  virDomainNetTypeToString;
> > +virDomainNetIndexByIfname;
> > +virDomainNetIndexByMac;
> > +virDomainNetInsert;
> > +virDomainNetRemoveByMac;
> >  virDomainObjAssignDef;
> >  virDomainObjSetDefTransient;
> >  virDomainObjGetPersistentDef;
> > diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> > index d6d7ad0..45b1bf0 100644
> > --- a/src/qemu/qemu_driver.c
> > +++ b/src/qemu/qemu_driver.c
> > @@ -4138,6 +4138,7 @@ static int qemuDomainAttachDevicePersistent(virDomainDefPtr vmdef,
> >                                              virDomainDeviceDefPtr newdev)
> >  {
> >      virDomainDiskDefPtr disk;
> > +    virDomainNetDefPtr net;
> >  
> >      switch(newdev->type) {
> >      case VIR_DOMAIN_DEVICE_DISK:
> > @@ -4158,6 +4159,31 @@ static int qemuDomainAttachDevicePersistent(virDomainDefPtr vmdef,
> >              return -1;
> >          newdev->data.disk = NULL;
> >          break;
> > +    case VIR_DOMAIN_DEVICE_NET:
> > +        net = newdev->data.net;
> > +        /* check mac */
> > +        if (virDomainNetIndexByMac(vmdef, net->mac) >= 0) {
> > +            char macbuf[VIR_MAC_STRING_BUFLEN];
> > +
> > +            virFormatMacAddr(net->mac, macbuf);
> > +            qemuReportError(VIR_ERR_INVALID_ARG,
> > +                            _("target mac %s already exists."), macbuf);
> > +            return -1;
> > +        }
> > +        /* Sanity check : test ifname confliction. */
> > +        if (net->ifname && virDomainNetIndexByIfname(vmdef, net->ifname) >= 0) {
> > +            qemuReportError(VIR_ERR_INVALID_ARG,
> > +                            _("target NIC %s already exists."), net->ifname);
> > +            return -1;
> > +        }
> > +        if (virDomainNetInsert(vmdef, net)) {
> > +            virReportOOMError();
> > +            return -1;
> > +        }
> > +        if (qemuDomainAssignPCIAddresses(vmdef) < 0)
> > +            return -1;
> 
> When qemuDomainAssignPCIAddresses() failed, we should remove net from vmdef,
> otherwise, it will cause libvirtd crashed.
> 

This vmdef will be just freed after this. Do I need care ?

Thanks,
-Kame


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