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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0017788||CentOS-8||qemu-kvm||public||2020-10-09 07:18||2020-10-09 07:18|
|Summary||0017788: nested virtualization: Win10 Guest with hypervisor features hits boot loop in 8.2, but not in 8.1|
|Description||With the current qemu-kvm package in 8.2, I'm unable to boot a Win10 Pro VM with hypervisor enabled - Windows will boot loop and finally hit Automatic Repair. This works though if I downgrade the qemu-kvm package to the version shipped with 8.1.|
qemu-kvm-2.12.0-99 (CentOS 8.2 / AppStream)
qemu-kvm-2.12.0-88 (CentOS 8.1 / AppStream)
|Steps To Reproduce||- install CentOS 8.2|
- create windows VM (in my case: UEFI, no secureboot, host-passthrough in libvirt config)
- install hypervisor features within windows
- reboot VM
To allow windows VM to boot, disable hypervisor feature, e.g.:
<feature policy='disable' name='hypervisor'/>
This allows the VM to boot, but no nested virtualization is working.
|Additional Information||I've tried to windbg the VM, but as I'm not skilled in this area the only thing I can report is that I hit a lot of Access Violation exceptions, multiple of which happened within OslArchHypervisorSetup.|
I've also tried several different qemu configs (enable secureboot, try different CPU features, etc.) but to no avail. The only thing that worked was to downgrade the qemu-kvm package.
Also, I'm not the only one to experience this, as I got the clue from serverfault:
I have no access to RHEL, but it's possible the problem exists there as well.
|Tags||No tags attached.|