Before changing BIOS settings we may want to see if hardware virtualization (VT-x for Intel, AMD-V for AMD processors) was already enabled.
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From a terminal issue
grep --color vmx /proc/cpuinfo ## for an Intel processor
grep --color svm /proc/cpuinfo ## for an AMD processor
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If virtualization was enabled the flag
vmx
(for Intel CPUs) or
svm
(for AMD CPUs) will be colored.
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If not, and the CPU supports hardware virtualization, we need to enable this in the computer BIOS.
See with the manual for the hardware and search for
Virtualization
,
Virtualization Technology (VT-x)
, or similar, here shown for an Award BIOS:
Set this entry to
Enabled
in case it is not yet set.
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We then can choose to use hardware virtualization in the virtual machine's System -> Acceleration settings:
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By this we use hardware virtualization for optimal performance, and we would even be able to run a 64-bit guest OS on a 32-bit host for testing.
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