Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

You are building a laboratory environment in which a KVM virtual machine (L1) must itself host additional KVM guests (L2). On the physical host (L0) you have verified that nested virtualization is enabled because the command cat /sys/module/kvm_intel/parameters/nested returns Y. However, inside the L1 guest the command grep -cw vmx /proc/cpuinfo returns 0, and attempts to start nested guests fail with the error "hardware virtualization unavailable."

Which change to the L1 VM's definition or launch parameters is most likely to allow nested virtualization to succeed?

  • Configure the L1 VM to use CPU mode host-passthrough (or add the +vmx/+svm flag) so the virtualization extensions are exposed to the guest.

  • Increase the L1 VM's vCPU count to two or more and enable CPU hot-plug.

  • Append the kernel parameter intel_iommu=on to the L1 guest to enable IOMMU support.

  • Change the L1 VM's virtual disk from VirtIO-blk to an IDE emulated disk.

CompTIA Linux+ XK0-006 (V8)
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