[libvirt] [PATCH] Drop hle feature for Haswell CPUs

Guido Günther agx at sigxcpu.org
Tue Dec 16 12:33:15 UTC 2014

The intel-microcode 3.20140913.1 update disables TSX-NI (transactional
memory instructions). When a server running libvirt is rebooted with
this update, libvirt no longer considers the machine to have a Haswell

 # virsh capabilities | grep -A1 '<arch>x86_64'

Since Intel disables the feature on their CPUs we shouldn't check for it
as well to keep VMs using Haswell working.

This was debugged and reported by Chris Boot at
 src/cpu/cpu_map.xml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/cpu/cpu_map.xml b/src/cpu/cpu_map.xml
index bd9b056..f41dbce 100644
--- a/src/cpu/cpu_map.xml
+++ b/src/cpu/cpu_map.xml
@@ -507,7 +507,6 @@
       <feature name='movbe'/>
       <feature name='fsgsbase'/>
       <feature name='bmi1'/>
-      <feature name='hle'/>
       <feature name='avx2'/>
       <feature name='smep'/>
       <feature name='bmi2'/>

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