[libvirt-users] how to control usb read write perm

[yue]

hi,all 
i have 2 questions. both is related to spice usb redirect.
1. if i can control RW perm of  usb device  which is producted via spice ? in order to control user's rw operation in guestVM .
 2.if user have several usbs, and plug them at the same time when using spice client.  if i can control which usb(s) can be accessed by user in  guestVM?
 
thanks  
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