So this quite likely might be a "feature" that got introduced with qemu
2.2:
commit 75d373ef9729bd22fbc46bfd8dcd158cbf6d9777
Author: Eduardo Habkost <ehabk...@redhat.com>
Date: Fri Oct 3 16:39:51 2014 -0300
target-i386: Disable SVM by default in KVM mode
Make SVM be disabled by default on all CPU models when in KVM mode.
Nested SVM is enabled by default in the KVM kernel module, but it is
probably less stable than nested VMX (which is already disabled by
default).
Add a new compat function, x86_cpu_compat_kvm_no_autodisable(), to keep
compatibility on previous machine-types.
I saw both machine types (pc-i440fx-trusty and pc-i440fx-utopic)
mentioned in some xml configs. Not sure which is which. Might be worth
checking the config in the currently not working case and if that is not
trusty, try to replace it with that.
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https://bugs.launchpad.net/bugs/1494602
Title:
qemu-system-x86 nested virtualisation is broken on AMD system
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