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io: implement io_pwritev/preadv for QIOChannelFile
The upcoming 'mapped-ram' feature will require qemu to write data to (and restore from) specific offsets of the migration file. Add a minimal implementation of pwritev/preadv and expose them via the io_pwritev and io_preadv interfaces. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: "Daniel P. Berrangé" <berrange@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de> Link: https://lore.kernel.org/r/20240229153017.2221-5-farosas@suse.de Signed-off-by: Peter Xu <peterx@redhat.com>
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