problem about blocked monitor when disk image on NFS can not be reached.

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hi all:

   kvm start with disk image on nfs server, when nfs server can not be
reached, monitor will be blocked. I change io_thread to SCHED_RR
policy, it will work unfluently waiting for disk read/write timeout.

I have tested a standalone thread to process kvm_handle_io, it can not
start up correctly, it may need qemu_mutux protection.

as io_thread process different io tasks, is it possible to transfer
kvm_handle_io and handle_mmio function into this thread? but the
problem will still stay, monitor will still be blocked by read/write
disk request.

is there anyone that will have a good suggestion? thanks.

Green.
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