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docs: Expand description of host-model CPU mode

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host-model is a nice idea but it's current implementation make it
useless on some hosts so it should be used with care.
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Jiri Denemark 2013-10-17 16:02:38 +02:00
parent e3ef20d7f7
commit 34adf622a3
1 changed files with 10 additions and 1 deletions
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@ -924,7 +924,16 @@
model even if the destination host contains more capable CPUs for
the running instance of the guest; but shutting down and restarting
the guest may present different hardware to the guest according to
the capabilities of the new host.</dd>
the capabilities of the new host. <strong>Beware</strong>, due to the
way libvirt detects host CPU and due to the fact libvirt does not
talk to QEMU/KVM when creating the CPU model, CPU configuration
created using <code>host-model</code> may not work as expected. The
guest CPU may differ from the configuration and it may also confuse
guest OS by using a combination of CPU features and other parameters
(such as CPUID level) that don't work. Until these issues are fixed,
it's a good idea to avoid using <code>host-model</code> and use
<code>custom</code> mode with just the CPU model from host
capabilities XML.</dd>
<dt><code>host-passthrough</code></dt>
<dd>With this mode, the CPU visible to the guest should be exactly
the same as the host CPU even in the aspects that libvirt does not