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virDomainNetDefCheckABIStability: Check for MTU change too

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=1623157

Changing MTU on a running guest is not possible and trying to do
so made us face many problems. That's why we forbid it in
5f44d7e357f61f7. However, there is still one possible path where
users can sneak in change: migration XML.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Michal Privoznik 2018-08-30 14:11:36 +02:00
parent b48d9e939b
commit 4ea3693104
1 changed files with 7 additions and 0 deletions
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7
src/conf/domain_conf.c
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@ -21901,6 +21901,13 @@ virDomainNetDefCheckABIStability(virDomainNetDefPtr src,
return false;
}
if (src->mtu != dst->mtu) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Target network card MTU %d does not match source %d"),
dst->mtu, src->mtu);
return false;
}
if (src->virtio && dst->virtio &&
!virDomainVirtioOptionsCheckABIStability(src->virtio, dst->virtio))
return false;