As already said in answers above,
In Linux environment
installing Qemu/KVM, VMware workstation and Virtualbox ON THE SAME HYPERVISOR is possible.
So the problem IS NOT in INSTALLATION
Once all of them are installed you have this :
lsmod | egrep 'vm[nmw]|vbox|kvm'
vboxpci 28672 0
vboxnetadp 28672 0
vboxnetflt 32768 0
vboxdrv 483328 3 vboxnetadp,vboxnetflt,vboxpci
vmnet 61440 13
vmw_vsock_vmci_transport 32768 0
vmw_vmci 81920 1 vmw_vsock_vmci_transport
vmmon 102400 0
vsock 40960 1 vmw_vsock_vmci_transport
kvm_amd 94208 9
kvm 700416 1 kvm_amd
irqbypass 16384 1 kvm
All the lines including kvm --> used by Qemu/KVM
All the lines including vbox --> used by VirtualBox
The others by VMware (look in :
-rw-r--r--. 1 root root 870400 Mar 30 20:19 vmblock.tar
-rw-r--r--. 1 root root 1341440 Mar 30 20:20 vmci.tar
-rw-r--r--. 1 root root 1443840 Mar 30 20:20 vmmon.tar
-rw-r--r--. 1 root root 768000 Mar 30 20:20 vmnet.tar
-rw-r--r--. 1 root root 1136640 Mar 30 20:20 vsock.tar
for source: module compiled at installation)
AND NOW THE USAGE OF THIS :
AS SAID by roadmr (the second answer above)
Only one can use Intel-VT or AMD-V at a moment
If you start some usage of Qemu/KVM for a 64bits Virtual Machine, then VirtualBox at the same time CANNOT make running a 64 bits machine, because VirtualBox does REQUIRES HW acceleration for 64 bits VM.
To give some light about answer by David Baird above:
With AMD Atlon X2 or X4, or AMD FX 8-core, or with Intel Core I5 or I7,(machines where I could make a try),
==> VirtualBox 5.2.10
is not able to make running at the same time on Linux, after KVM has locked Intel-VT or AMD-V access, and extra 64 bits Virtual Machine !!!
==> VMware player or workstation 14.1
will be, PROVIDED you uncheck Intel-VT or AMD-V usage !!!
Now Forget Qemu/KVM, and I tried to start a 64 bit VM in VirtualBox, and after a secaond 64 bit VM at the same time in VMware, or in the reverse order:
ONLY the first one is able to run with a default configuration!!!!
But Disabling Hardware acceleration , is it possible as suggested in answer by
VM properties --> System --> Acceleration:
disabling HW accel. is impossible for 64 bits VM machine:
For example if you unckeck "Hardware Acceleration", in the configuration menu of a given 64bits VM machine, the VirtualBox configurator protests, and re-enable automatically "Hardware Acceleration".(check it by going back in the same menu !!)
In VMware 14 :
Virtual Machine --> Hardware:Processor -->
you can unchek Virtualization Engine
AND THEN your 64bits VM can start, even if your Intel-VT or AMD-V CPU feature is locked by KVM or VirtualBox
So VMware in last today release is able to emulate Ring 0 instruction for 64 bits Virtual machines, as it was doing it for 32bits machine, more than twenty years ago now !!!!
And honestly it's difficult to notice the difference of performance for 64 bit VM VMware machine running with or without Hardware acceleration, without a benchmark !
Now we can expect that some days, kvm and VirtualBox, will be able too to emulate Ring 0 CPU instructions for 64 bits machine !!!!!