kvm: avoid reentring kvm_flush_coalesced_mmio_buffer()
mmio callbacks invoked by kvm_flush_coalesced_mmio_buffer() may
themselves indirectly call kvm_flush_coalesced_mmio_buffer().
Prevent reentering the function by checking a flag that indicates
we're processing coalesced mmio requests.
Signed-off-by: NAvi Kivity <avi@redhat.com>
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