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kvm: add detail error message when fail to add ioeventfd
I try to hotplug 28 * 8 multiple-function devices to guest with old host kernel, ioeventfds in host kernel will be exhausted, then qemu fails to allocate ioeventfds for blk/nic devices. It's better to add detail error here. Signed-off-by: Amos Kong <akong@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
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