Windows 10: KVM Host --W10 VM with HYPER -V running another VM (Nesting)

Discus and support KVM Host --W10 VM with HYPER -V running another VM (Nesting) in Windows 10 Virtualization to solve the problem; Hi there. It seems some CPU's will handle HYPER-V in a VM running on a Host where a HYPERVISOR (KVM in this case) is already running. One needs to... Discussion in 'Windows 10 Virtualization' started by jimbo45, Apr 18, 2016.

  1. JIMBO45
    jimbo45 Win User

    KVM Host --W10 VM with HYPER -V running another VM (Nesting)


    Hi there.

    It seems some CPU's will handle HYPER-V in a VM running on a Host where a HYPERVISOR (KVM in this case) is already running.
    One needs to make a few mods otherwise booting up the VM running UNDER the HYPER-V (the 2nd level VM) will freeze.

    I'm currently playing with this -- it looks like some modules from QEMU need to be updated -- and one needs to use IOMMU to get any sort of decent I/O throughput - even on SSD's.

    I'll post back when I've got some better results -- note I haven't a CLUE about AMD CPU's . I think also getting USB and SOUND on to the second level VM could be a problem. PCI passthru is pretty easy from the KVM Host to the Windows VM (ist level) but passing that to the second level VM is proving somewhat problematical.

    (HOST --CENTOS 7 with KVM, ist level VM W10 pro with HYPER-V enabled, second level VM W7 ultimate -- all x-64 machines).

    I believe also performance can be improved by switching from Full virtualisation to "Para virtualision" on the guests -- easily enough done with settings in KVM - but then passthru gets a bit ????.

    Anyway I've got some time to play with all this --when I'm done I'll post a guide. It should work also for most other common Linux distros capable of running KVM.

    Tip - don't use the libvirt manager GUI as a console for your VM's as once in Full screen you can't always get back to Windowed mode -- might be my mouse etc. Use RDP / VNC instead -- no problem connecting to VM's even if you are running the VM's on your local machine.

    Cheers
    jimbo

    :)
     
    jimbo45, Apr 18, 2016
    #1
  2. RFT OB1
    RFT OB1 Win User

    Remote Desktop Connection problem with Virtual Machine

    We made the big mistake of configuring a WINDOWS-10 VM to allow for Remote Desktop Connections. We are unable to disassociate the VM from RDM. We can no longer access the VM!!! The following is the pertinenet
    information:

    • Server is running Windows-10 Professional 64 with Hyper-V installed.
    • VM is Windows-10 Professional 64.
    • In VM allowed Remote Desktop Connections.
    • From server successfully connected to VM via RDM.
    • Closed RDM connection. Unable to access VM.
    • Turned off VM from Hyper-V Manager.
    • Attempted to restart VM, unable to connect via Hyper-V from message box the following is displayed:

      Video Remoting was disconnected. The virtual maching is currently using the Remote X 3D video adapter. A user is currently connected via Remote Desktop Connect to the virtual machine by using Remote Desktop Connection.
    • Connected via Remote Desktop Connection. Attempted to turn off allowing Remote Desktop Connection. VM hung.
    • VM Wouldn't turn off via Hyper-V manager.
    • Shutdown host system and rebooted.
    • Unable to connect via console or RDM.
    • Shutdown host system and rebooted.
    • Deleted VM via Hyper-V Manager.
    • Restored VM system disk from backup prior to RDM usage.
    • Created new VM. the messages in itm 7 above are displayed.
    What can be done to recover? Why does Hyper-V retain a broken connection?
     
    RFT OB1, Apr 18, 2016
    #2
  3. JOERAYNER
    joerayner Win User
    Secure file share with between host and hyper-v guest

    I have a windows 10 host running hyper-v. I want to share the files that are on the host securely with a hyper-v vm without having to copy the files, i.e. the file share is on the host not the guest.

    Current method is to set up a file share on the host and disable authentication for ALL file shares, this is so that I do not need to store the host account
    credential on the VM which would be a risk. I then set up a internal virtual switch in hyper-v and disable files sharing protocal on ALL other network interfaces on the host. I not sure this is secure but its defiantly not very elegant for such a seeming
    simple problem.

    I can see it causeing problems in the future when we need another files share on the host for a differnet reason.

    Is there a simpler, less invasive way to do this?
     
    joerayner, Apr 18, 2016
    #3
  4. INDU119
    indu119 Win User

    KVM Host --W10 VM with HYPER -V running another VM (Nesting)

    Hi.

    I'll be trying something similar out.
    With Hyper-V on Ubuntu 14.04
    Need some help to get it working.

    Can you please mention the modifications/updations that are needed?
    The guide would be really helpful.

    Thanks,
    indu.
     
    indu119, Apr 22, 2016
    #4
  5. JIMBO45
    jimbo45 Win User
    Hi there

    I'll have a go with this over the weekend -- not doing much else this weekend so I've got a bit of time.
    It should work on UBUNTU as well -- note enable VTX on your CPU or it won't work.

    Cheers
    jimbo
     
    jimbo45, Apr 22, 2016
    #5
  6. LBERTEAU
    lberteau Win User
    Hi,

    I would be interested in your guide too.

    I have KVM with nested virtualization enabled running on Ubuntu 14.04, and a Windows Server 2012 R2 guest.
    But in the guest, the command line
    Code: wmic cpu get VirtualizationFirmwareEnabled[/quote] returns false

    Thanks.
     
    lberteau, May 3, 2016
    #6
  7. SAGARNIKAM
    sagarnikam Win User
    Hi,

    I would also like to try this on Ubuntu 14.04
    Can you please let me know how to get it working.
    You mentioned that some modules of QEMU needs to be updated.
    Any details on how to get this working will be helpful

    Regards,
    Sagar

     
    sagarnikam, Apr 5, 2018
    #7
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KVM Host --W10 VM with HYPER -V running another VM (Nesting)

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