Dear all:
In a Linux system, the access of a hardware device is to open and
close its device node. However, using device virtualization, the physical
device can be shared with one more guest OSes. Does the device node of the
shared physical device still need to be opened and closed turn by turn for
being accessed by the guest OSes? Does it mean that the device sharing
mechanism is performed in the user space and not kernel space? What are
performed in the kernel space if KVM is used? How about Xen, QEMU, and
VMWare, or other device virtualization techniques? I'm a beginner for
virtualization, and hope that someone can answer to my questions Thanks very
much!
Sincerely,
Huang.
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