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KVM - Coggle Diagram

- - - - VMCB
        
        State save area
        
        Control area
      - VMRUN
        
        Save host state in VM_HSAVE_PA
        
        switch to VM context
        
        Once a VM exit, VMRUN returns.
        
        only RIP, RSP, RAX are restored to previous host values
        others still contain the guest values.
        
        Full context switch require a manual execution of VMSAVE/VMLOAD from memory
      - KVM
        
        vmcb12
        
        vmcb02
        
        GPA: Guest Physical Address
        HVA: Host Virtual Address
      - *Permission bitmap
        Control which MSRs can be accessed by a VM
        
        8kb with two bits per MSR
        
        bit 1 - access is intercepted and triggers a vm exit
        
        bit 0 - VM has direct access to MSR
      - EFER - Extended Feature Enable Register
        LSTAR - Syscall Target Address
      - L