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Provide semantic documentation for how the libxc calls relate to the hypervisor interface, and how they are to be used. Also document the bug (present at least in Linux 3.12) that setting the evtchn fd to nonblocking doesn't in fact make xc_evtchn_pending nonblocking, and describe the appropriate workaround. Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com> CC: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> CC: Jan Beulich <JBeulich@suse.com> CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>