From: Michal Privoznik <mprivozn@redhat.com>
Date: Thu, 8 Jun 2017 08:14:36 +0000 (+0200)
Subject: qemu: Set iface MTU on hotplug
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5e916425cc1a77f771dfef790f64a52e6ee12cac;p=thirdparty%2Flibvirt.git

qemu: Set iface MTU on hotplug

https://bugzilla.redhat.com/show_bug.cgi?id=1408701

While implementing MTU (572eda12ad and friends), I've forgotten
to actually set MTU on the host NIC in case of hotplug. We
correctly tell qemu on the monitor what the MTU should be, but we
are not actually setting it on the host NIC.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Laine Stump <laine@laine.org>
(cherry picked from commit f00e6f8bc9081f158b7d6a1dcfa82218b1dbfb4d)
---

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index e9ecd94046..34accb2e37 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1134,6 +1134,10 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
         }
     }
 
+    if (net->mtu &&
+        virNetDevSetMTU(net->ifname, net->mtu) < 0)
+        goto cleanup;
+
     for (i = 0; i < tapfdSize; i++) {
         if (qemuSecuritySetTapFDLabel(driver->securityManager,
                                       vm->def, tapfd[i]) < 0)