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From b46a1a6517874144f0cdf918f8148503bb5771e1 Mon Sep 17 00:00:00 2001
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Message-Id: <b46a1a6517874144f0cdf918f8148503bb5771e1.1382534061.git.jdenemar@redhat.com>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Tue, 22 Oct 2013 16:09:06 +0100
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Subject: [PATCH] docs: Expand description of host-model CPU mode
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https://bugzilla.redhat.com/show_bug.cgi?id=1014682
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host-model is a nice idea but it's current implementation make it
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useless on some hosts so it should be used with care.
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(cherry picked from commit 34adf622a352cbb80a98162a0f9ac3f9de3f95cb)
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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docs/formatdomain.html.in | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
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index 512e0df..132c16c 100644
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--- a/docs/formatdomain.html.in
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+++ b/docs/formatdomain.html.in
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@@ -922,7 +922,16 @@
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model even if the destination host contains more capable CPUs for
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the running instance of the guest; but shutting down and restarting
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the guest may present different hardware to the guest according to
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- the capabilities of the new host.
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+ the capabilities of the new host. Beware, due to the
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+ way libvirt detects host CPU and due to the fact libvirt does not
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+ talk to QEMU/KVM when creating the CPU model, CPU configuration
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+ created using host-model may not work as expected. The
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+ guest CPU may differ from the configuration and it may also confuse
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+ guest OS by using a combination of CPU features and other parameters
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+ (such as CPUID level) that don't work. Until these issues are fixed,
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+ it's a good idea to avoid using host-model and use
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+ custom mode with just the CPU model from host
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+ capabilities XML.
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host-passthrough
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With this mode, the CPU visible to the guest should be exactly
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the same as the host CPU even in the aspects that libvirt does not
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--
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1.8.4
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