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docs: document cpu host-passthrough migration issue

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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
arrival.

Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
This commit is contained in:
Jason J. Herne 2016-12-09 14:38:35 -05:00 committed by Jiri Denemark
parent 71bbe65311
commit 256f6b1826
1 changed files with 5 additions and 1 deletions
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docs/formatdomain.html.in
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@ -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 may hang or crash upon
resuming execution on the destination host.</dd>
</dl>
In both <code>host-model</code> and <code>host-passthrough</code>