Stefan, List Please find a patch that fixes the crashes for using virtio with libiscsi. The problem was that block/iscsi.c always assumed we got a plain buffer to read data into, and when we got an iovector array instead we would overwrite pointers with garbage and crash.
Since we can get iovectors for the write case as well I have added a fix for when the guest is writing data to the target to handle the iovector case as well. The new calls added are not protected with (LIBISCSI_FEATURE_IOVECTOR) checks since anyone building a new/current version of qemu should probably also build against a current libiscsi. I will send patches later to remove the current (LIBISCSI_FEATURE_IOVECTOR) checks in the rest of the file. regards ronnie sahlberg