[Qemu-devel] [Bug 1806040] Re: Nested VMX virtualization error on last Qemu versions

[Paolo Bonzini]

Hi,

the kernel you are using should not have nested virtualization enabled
by default.  Are you by chance using nested virtualization of some other
virtual machines?  If so, it's enough to add "-vmx" at the end of "-cpu
host,-hypervisor,kvm=off".

If you are not sure of the answer, please check if your
/etc/modprobe.conf file, or any file in your /etc/modprobe.d directory,
contains the line "options kvm_intel nested=1".

Thanks!

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https://bugs.launchpad.net/bugs/1806040

Title:
  Nested VMX virtualization error on last Qemu versions

Status in QEMU:
  New

Bug description:
  Recently updated Qemu on a Sony VAIO sve14ag18m with Ubuntu Bionic
  4.15.0-38 from Git

  After launching a few VMs, noticed that i could not create Snapshot due to 
this error:
  "Nested VMX virtualization does not support live migration yet"

  I've created a new Windows 7 X64 machine with this compilation of Qemu
  and the problem persisted, so it's not because of the old machines.

  I launch Qemu with this params (I use them for malware analisys adn re...):
  qemu-system-x86_64 -monitor stdio -display none -m 4096 -smp cpus=4 
-usbdevice tablet -drive 
file=VM.img,index=0,media=disk,format=qcow2,cache=unsafe -net 
nic,macaddr="...." -net bridge,br=br0 -cpu host,-hypervisor,kvm=off -vnc 
127.0.0.1:0 -enable-kvm 

  
  Deleting the changes made on this commit solved the problem, but I dont have 
idea what is this for, so... xDD 
  https://github.com/qemu/qemu/commit/d98f26073bebddcd3da0ba1b86c3a34e840c0fb8

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