How to disable vt-x on windows guest?

Discussion in 'Proxmox VE: Installation and configuration' started by mgiammarco, Nov 10, 2018.

  1. mgiammarco

    mgiammarco Member

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    I have proxmox with nested virtualization enabled.
    I have a windows 10 guest with cpu type set to host to get all features of my xeon.
    I have bitten by a windows 10 1803 bug: if vt-x is enabled the system not boot anymore.
    So I change cpu type to kvm64 that has no support for vt-x and windows boots again!
    But I lose xeon features.
    How can I disable only vt-x for only that guest?
    Thanks,
    Mario
     
  2. dcsapak

    dcsapak Proxmox Staff Member
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    any reference to that? i am running multiple windows installations with vt-x enabled no problem

    the only possibility at the moment is to look at the generated qemu cmdline with 'qm showcmd ID --pretty' and take the '-cpu line'
    (should look like: "-cpu 'host,+kvm_pv_unhalt,...' ") modify it so that you add ',-FLAG' and put that whole thing into the 'args' parameter of the vm config (in /etc/pve/qemu-server/ID.conf a new line with args: ... )
     
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  3. mgiammarco

    mgiammarco Member

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    I started from this:
    https://answers.microsoft.com/en-us...t/582bd0ba-e29f-46b3-b347-2fd73c8556e3?auth=1
    Then tried also these workarounds ( I also was able to boot in safe mode too):
    http://www.tomshardware.co.uk/forum...indows-corrupted-bootres-dll-unable-boot.html

    But this was the solution:
    https://www.reddit.com/r/techsupport/comments/8mh3t0/cefimicrosoftbootresourcescustombootresdll_is/

    So I suppose I will keep kvm64 for now.
     
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