On f27 release (Fedora-Server-dvd-ppc64le-27-20171011.n.0.iso) if I run a qemu VM in a qemu VM, I got the error message: qemu-system-ppc64: Unable to set CPU compatibility mode in KVM: Invalid argument qemu seems working but the CAS (negotiation with the host for different architecture points) have not been done correctly and that could affect qemu in some ways. A patch have already been done upstream, https://git.qemu.org/?p=qemu.git;a=commit;h=cc7b35b169e96600c09947a31c610c84a3eda3ff I ported this patch on the qemu-2.10.0-4.fc27 https://koji.fedoraproject.org/koji/taskinfo?taskID=22403366 This solve the problem and the patched qemu works fine. I tried it on ppc64 and ppc64le only.
Created attachment 1338238 [details] qemu patch
Thanks for pointing out the commit, I'll push it shortly
qemu-2.10.1-1.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-8db9c497f9
qemu-2.10.1-1.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-8db9c497f9
qemu-2.10.1-1.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.