I currently run a couple of VMs (one Windows 10 and one Fedora Server)
under QEMU/KVM. I wanted to create a new one and got this:

   Unable to complete install: 'internal error: process exited while connecting 
to monitor: 2018-12-31T14:23:14.816147Z qemu-system-x86_64: can't apply global 
IvyBridge-IBRS-x86_64-cpu.osxsave=on: Property '.osxsave' not found'

   Traceback (most recent call last):
     File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in 
cb_wrapper
       callback(asyncjob, *args, **kwargs)
     File "/usr/share/virt-manager/virtManager/create.py", line 2559, in 
_do_async_install
       guest.start_install(meter=meter)
     File "/usr/share/virt-manager/virtinst/guest.py", line 465, in 
start_install
       doboot, transient)
     File "/usr/share/virt-manager/virtinst/guest.py", line 401, in 
_create_guest
       domain = self.conn.createXML(install_xml or final_xml, 0)
     File "/usr/lib64/python3.7/site-packages/libvirt.py", line 3718, in 
createXML
       if ret is None:raise libvirtError('virDomainCreateXML() failed', 
conn=self)
   libvirt.libvirtError: internal error: process exited while connecting to 
monitor: 2018-12-31T14:23:14.816147Z qemu-system-x86_64: can't apply global 
IvyBridge-IBRS-x86_64-cpu.osxsave=on: Property '.osxsave' not found

The last line is the key. This is similar to a bug I had a while back and 
reported at the time:

https://bugzilla.redhat.com/show_bug.cgi?id=1644848

When it happened before I edited the XML file to remove the .osxsave
flag and that solved the problem. However now it's happening with a
fresh VM so there's no XML file to edit. Note that the new VM is a
small Windows test install with no special configuration, i.e.
everything just uses the default settings.

I've posted about this on the VFIO list but haven't received a solution
so far. See

https://www.redhat.com/archives/vfio-users/2018-December/msg00026.html

poc
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