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The current libxl code doesn't deal with read-only drives at all. Upstream QEMU and qemu-xen only support read-only cdrom drives: make sure to specify "readonly=on" for cdrom drives and return error in case the user requested a non-cdrom read-only drive. This is XSA-142, discovered by Lin Liu (https://bugzilla.redhat.com/show_bug.cgi?id=1257893). Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>