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From: Prerna Saxena <prerna@linux.vnet.ibm.com>
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Date: Tue, 4 Nov 2014 23:00:36 +0530
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Subject: [PATCH] docs: Add documentation for compat mode.
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Add documentation to explain how compat-mode can be invoked with libvirt
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running on PowerPC architecture.
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It also mentions that this change is available libvirt 1.2.11 onwards.
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Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
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Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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(cherry picked from commit 9265fd19b68d787e478f5e490524da794965a5f1)
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---
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docs/formatdomain.html.in | 15 ++++++++++++++-
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1 file changed, 14 insertions(+), 1 deletion(-)
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diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
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index 0099ce7..bdaf808 100644
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--- a/docs/formatdomain.html.in
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+++ b/docs/formatdomain.html.in
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@@ -1047,7 +1047,20 @@
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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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+ capabilities XML.
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+ (Since 1.2.11). PowerISA allows
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+ processors to run VMs in binary compatibility mode supporting an
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+ older version of ISA. Libvirt on PowerPC architecture uses the
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+ host-model to signify a guest mode CPU running in
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+ binary compatibility mode. Example:
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+ When a user needs a power7 VM to run in compatibility mode
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+ on a Power8 host, this can be described in XML as follows :
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+
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+ <cpu mode='host-model'>
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+ <model>power7</model>
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+ </cpu>
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+ ...
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+
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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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