Intercept REPORT_LUNS commands addressed either to SRP LUN 0 or the well-known LUN for REPORT_LUNS commands. This is required to implement the SAM and SPC specifications.
Since SRP implements only a single SCSI target port per connection, the SRP target is required to report all available LUNs in response to a REPORT_LUNS command addressed either to LUN 0 or the well-known LUN. Instead, QEMU was forwarding such requests to the first QEMU SCSI target, with the result that initiators that relied on this feature would only see LUNs on the first QEMU SCSI target. Behavior for REPORT_LUNS commands addressed to any other LUN is not specified by the standard and so is left unchanged. This preserves behavior under Linux and SLOF, which enumerate possible LUNs by hand and so address no commands either to LUN 0 or the well-known REPORT_LUNS LUN. Signed-off-by: Nathan Whitehorn <nwhiteh...@freebsd.org> -- hw/scsi/spapr_vscsi.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/hw/scsi/spapr_vscsi.c b/hw/scsi/spapr_vscsi.c index c0c46d7..123a942 100644 --- a/hw/scsi/spapr_vscsi.c +++ b/hw/scsi/spapr_vscsi.c @@ -63,6 +63,8 @@ #define SCSI_SENSE_BUF_SIZE 96 #define SRP_RSP_SENSE_DATA_LEN 18 +#define SRP_REPORT_LUNS_WLUN 0xc10100000000000 + typedef union vscsi_crq { struct viosrp_crq s; uint8_t raw[16]; @@ -720,12 +722,70 @@ static void vscsi_inquiry_no_target(VSCSIState *s, vscsi_req *req) } } +static void vscsi_report_luns(VSCSIState *s, vscsi_req *req) +{ + BusChild *kid; + int i, len, n, rc; + uint8_t *resp_data; + bool found_lun0; + + n = 0; + found_lun0 = false; + QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { + SCSIDevice *dev = SCSI_DEVICE(kid->child); + + n += 8; + if (dev->channel == 0 && dev->id == 0 && dev->lun == 0) { + found_lun0 = true; + } + } + if (!found_lun0) { + n += 8; + } + len = n+8; + + resp_data = g_malloc0(len); + memset(resp_data, 0, len); + stl_be_p(resp_data, n); + i = found_lun0 ? 8 : 16; + QTAILQ_FOREACH(kid, &s->bus.qbus.children, sibling) { + DeviceState *qdev = kid->child; + SCSIDevice *dev = SCSI_DEVICE(qdev); + + if (dev->id == 0 && dev->channel == 0) { + resp_data[i] = 0; /* Use simple LUN for 0 (SAM5 4.7.7.1) */ + } else { + resp_data[i] = (2 << 6); /* Otherwise LUN addressing (4.7.7.4) */ + } + resp_data[i] |= dev->id; + resp_data[i+1] = (dev->channel << 5); + resp_data[i+1] |= dev->lun; + i += 8; + } + + vscsi_preprocess_desc(req); + rc = vscsi_srp_transfer_data(s, req, 0, resp_data, len); + g_free(resp_data); + if (rc < 0) { + vscsi_makeup_sense(s, req, HARDWARE_ERROR, 0, 0); + vscsi_send_rsp(s, req, CHECK_CONDITION, 0, 0); + } else { + vscsi_send_rsp(s, req, 0, len - rc, 0); + } +} + static int vscsi_queue_cmd(VSCSIState *s, vscsi_req *req) { union srp_iu *srp = &req->iu.srp; SCSIDevice *sdev; int n, lun; + if ((srp->cmd.lun == 0 || be64_to_cpu(srp->cmd.lun) == SRP_REPORT_LUNS_WLUN) + && srp->cmd.cdb[0] == REPORT_LUNS) { + vscsi_report_luns(s, req); + return 0; + } + sdev = vscsi_device_find(&s->bus, be64_to_cpu(srp->cmd.lun), &lun); if (!sdev) { DPRINTF("VSCSI: Command for lun %08" PRIx64 " with no drive\n",