[libvirt] [PATCH v2 06/11] docs: document cpu host-passthrough migration issue

Jason J. Herne jjherne at linux.vnet.ibm.com
Fri Dec 9 19:38:35 UTC 2016

Documents in formatdomain.html that when migrating a guest
defined with the host-passthrough CPU model from a machine that
is running on a newer CPU model than the destination machine's
CPU model, it is very likely that the guest will crash upon

Signed-off-by: Jason J. Herne <jjherne at linux.vnet.ibm.com>
 docs/formatdomain.html.in | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 9218eec..b7c1e87 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1292,7 +1292,11 @@
           understand. Though the downside of this mode is that the guest
           environment cannot be reproduced on different hardware. Thus, if you
           hit any bugs, you are on your own. Further details of that CPU can
-          be changed using <code>feature</code> elements.</dd>
+          be changed using <code>feature</code> elements. Migration of a guest
+          using host-passthrough is dangerous if the source and destination
+          hosts are not identical in both hardware and configuration. If such
+          a migration is attempted then the guest will very likely hang or
+          crash upon resuming execution on the destination host.</dd>
         In both <code>host-model</code> and <code>host-passthrough</code>

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