RFC: proposal for VM reset hcall

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For the e500 PV platform we need a VM reset mechanisms.

Hypercall: KVM_HC_VM_RESET
Description:  Requests that the virtual machine be reset.  The
              hcall takes no arguments. If successful the hcall does not
              return.

Arguments:
     r11    hcall-token   KVM_HC_VM_RESET

Return values
     r3     status        Status of the hcall.  If the hcall succeeds
                          it does not return.  If an error occurs
                          EV_INTERNAL is returned.


Implementation notes:

   -expect hcall token to be defined with KVM_HCALL_TOKEN(KVM_HC_VM_RESET)

   -the KVM_HC_FEATURES hcall should be expanded with a new feature bit
    to advertise the reset hcall to the VM:  #define KVM_FEATURE_VM_RESET


Regards,
Stuart


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