As we have known, in KVM full virtualization, guest VM is running in
non-root mode and KVM is running in root mode. While, in non-root mode,
guest kernel is running in Ring 0 and Apps are running in Ring 3.
However, what about the ring privilege for host linux?
In my knowledge, host linux is not controlled by VMX instructions and
VMCS/VMCB. therefore, host linux should be running in root mode. Before
we install KVM, host linux just run in Ring 0 (at that time, there is no
root mode or non-root mode because VMX is not active). Hence, after we
install KVM module, host linux kernel should be still in Ring 0 of root
mode and Apps in host should run in Ring 3 of root mode. Is KVM running
in higher privileged mode like Ring -1 of root mode or also running in
Ring 0 of root mode?
Maybe my thoughts about KVM privilege ring is not correct. :-) Please
give me some comments and I will really appreciate for your help.
Thank you,
Best Regards,
Min Li
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