Testing with the identified patch doesn't solve the issue, in addition
looking at the cpu flags (core2duo +xsave) this may not be a valid
configuration since xsave assumes additional features will be there
(instead of creating an older cpu model with xsave.) Therefore I believe
this is a configuration issue.

The comment above in #4 assumes your host has the correct cpu features, you can 
always run something like:
kvm -cpu host,+xsave,check   to check if are issues with the host plus 
additional features settings. In addition I've been able to use '-cpu 
SandyBridge,+xsave' and this also works.

Marking this 'Won't Fix' as there is a clear workaround (use another CPU
model), and this configuration may not be valid.

Thanks

** Changed in: linux (Ubuntu Trusty)
       Status: In Progress => Won't Fix

** Changed in: linux (Ubuntu)
       Status: Fix Released => Invalid

** Changed in: linux (Ubuntu Precise)
   Importance: Medium => Undecided

** Changed in: linux (Ubuntu Trusty)
   Importance: Medium => Undecided

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https://bugs.launchpad.net/bugs/1285708

Title:
  FreeBSD Guest crash on boot due to xsave instruction issue

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