qemu: Drop vmx-* from migratable CPU model only when origCPU is set
When qemuDomainMakeCPUMigratable is called with origCPU == NULL the code
just removed all vmx-* features marked as added in the specified CPU
model just like when origCPU is not NULL, but does not list any of the
vmx-* features. But this is wrong, we should not touch these features at
all when no origCPU is supplied, which happens when parsing XML passed
by a user (e.g., migration XML). Such XML is supposed to be generated by
libvirt as migration XML and contains only vmx-* features explicitly
requested by a user.
https://issues.redhat.com/browse/RHEL-52314
Signed-off-by: Jiri Denemark <jdenemar@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
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