Blame SOURCES/kvm-x86.conf

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# Setting modprobe kvm_intel/kvm_amd nested = 1
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# only enables Nested Virtualization until the next reboot or
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# module reload. Uncomment the option applicable
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# to your system below to enable the feature permanently.
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#
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# User changes in this file are preserved across upgrades.
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#
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# For Intel
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#options kvm_intel nested=1
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#
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# For AMD
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#options kvm_amd nested=1