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Currently a datacopier may source its data from an fd or local buffer, but its destination must be an fd. For migration v2, libxl needs to read from the migration stream into a local buffer. Implement a "read into local buffer" mode, invoked when readbuf is set and writefd is -1. On success, the callback passes the number of bytes read. Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> [Rewrite commit message] Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> CC: Ian Campbell <Ian.Campbell@citrix.com> CC: Ian Jackson <Ian.Jackson@eu.citrix.com> CC: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com>