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kvm: test for ioeventfd support on old kernels
There used to be a limit of 6 KVM io bus devices in the kernel. On such a kernel, we can't use many ioeventfds for host notification since the limit is reached too easily. Add an API to test for this condition. Signed-off-by: Stefan Hajnoczi <email@example.com> Signed-off-by: Michael S. Tsirkin <firstname.lastname@example.org>
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