Comment 9 for bug 1593605

Denis, thanks a lot for the reminder and the analysis here. I knew about this issue at one point -- see https://bugzilla.redhat.com/show_bug.cgi?id=1185253 -- but by now I've completely forgotten that HyperV enlightenments and UEFI SMP Win7 don't mix.

Also, for your analysis in comment #7 -- thanks for that too; I've never dug into it this deep. In the RHBZ I referenced above, there's a link to MSDN -- https://technet.microsoft.com/en-us/library/dn282285.aspx -- which indicates that the UEFI Win7 family was never meant to be run as HyperV guests. Those docs were enough explanation to me.

I don't think hacking on OVMF's VBE shim would be smart at this point -- the VBE shim is already an ugly hack to trick Win7 into working. I think the best course of action here is to disable HyperV enlightenments for Win7 UEFI guests. That's what virt-manager does as well:

https://github.com/virt-manager/virt-manager/commit/cbba1c4dd381

Given that this is not a QEMU issue, I'm closing the report (again).