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shared_info_page
2009 Apr 27
1
VPIO device model for Xen guests
...issues this hypercall to check the state
of the device. The state could be “idle” or “busy”. “Idle” means no
other guest is currently using the device. “busy” means other guest is
using the device. We may use just one char or int value to denote the
state.
Note: it might be better implement using shareinfo_page of Xen. Then
the performance will be better.
HYPERVISOR_device_op, grab the device. This should be called after the
device driver checked the state of the device, and the state is
“idle”. In this case, the guest device driver issues this hypercall to
actually grab the device. If the device is “bus...