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[libvirt] [PATCH] virDomainNetDefCheckABIStability: Check for MTU change too


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>
 src/conf/domain_conf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 38cac07913..59ca9f5888 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -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;

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