From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: Create VM exits when guest executes IRET on Intel CPU ?
Date: Sat, 25 Feb 2017 04:20:13 -0500 (EST)
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> Within the guest I run a BSD guest OS that returns from certain system
> calls using the IRET instruction.
> 
> Do you have any thoughts on where I could be wrong?

No, but I suggest using a small unit test in kvm-unit-tests
https://www.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git/
(either vmx.flat to test the VMX settings, or a test using IRET
to test your modified KVM).  Tracing the unit test with trace-cmd
can provide clues more easily.

Paolo