On 10/18/2013 08:08 AM, Jiri Denemark wrote: > host-model is a nice idea but it's current implementation make it > useless on some hosts so it should be used with care. > > Signed-off-by: Jiri Denemark <jdenemar@xxxxxxxxxx> > --- > docs/formatdomain.html.in | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) ACK. Never hurts to document caveats. > > diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in > index c5a3fa8..491a6a9 100644 > --- a/docs/formatdomain.html.in > +++ b/docs/formatdomain.html.in > @@ -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 > -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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