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From b84c055e38c1075af7ff51c9809977a48118ded2 Mon Sep 17 00:00:00 2001
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Message-Id: <b84c055e38c1075af7ff51c9809977a48118ded2@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Tue, 4 Sep 2018 10:41:02 +0200
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Subject: [PATCH] virDomainNetDefCheckABIStability: Check for MTU change too
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RHEL-7.6: https://bugzilla.redhat.com/show_bug.cgi?id=1623157
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RHEL-8.0: https://bugzilla.redhat.com/show_bug.cgi?id=1623158
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Changing MTU on a running guest is not possible and trying to do
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so made us face many problems. That's why we forbid it in
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5f44d7e357f61f7. However, there is still one possible path where
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users can sneak in change: migration XML.
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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(cherry picked from commit 4ea3693104c03ac40a6595f5b9bcda58fa18afe7)
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/conf/domain_conf.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
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index 35f944d92a..a881b43b51 100644
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--- a/src/conf/domain_conf.c
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+++ b/src/conf/domain_conf.c
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@@ -21628,6 +21628,13 @@ virDomainNetDefCheckABIStability(virDomainNetDefPtr src,
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return false;
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}
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+ if (src->mtu != dst->mtu) {
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+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
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+ _("Target network card MTU %d does not match source %d"),
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+ dst->mtu, src->mtu);
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+ return false;
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+ }
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+
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if (src->virtio && dst->virtio &&
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!virDomainVirtioOptionsCheckABIStability(src->virtio, dst->virtio))
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return false;
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--
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2.18.0
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