iscsi: add support for iovectors
This patch adds support for directly passing the iovec array from QEMUIOVector if libiscsi supports it (1.8.0 or newer). Signed-off-by: NPeter Lieven <pl@kamp.de> [Preserve the improvements from commit 4cc841b5, iscsi: partly avoid iovec linearization in iscsi_aio_writev, 2012-11-19 - Paolo] Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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