On 8/4/22 05:40, Mike Christie wrote:
DID_NEXUS_FAILURE is internal to the SCSI layer. Drivers must not use it because: 1. It's not propagated upwards, so SG IO/passthrough users will not see an error and think a command was successful. 2. There is no handling for them in scsi_decide_disposition so it results in the scsi eh running. It looks like virtio_scsi gets this when something like qemu returns VIRTIO_SCSI_S_NEXUS_FAILURE. It looks like qemu returns that error code if host OS returns DID_NEXUS_FAILURE (qemu's internal SCSI_HOST_RESERVATION_ERROR maps to DID_NEXUS_FAILURE). This shouldn't happen for linux since we don't propagate that error code to userspace. This has us convert VIRTIO_SCSI_S_NEXUS_FAILURE to a SAM_STAT_RESERVATION_CONFLICT in case some other virt layer is returning it. In that case we will still get the reservation confict failure we expect. Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx> --- drivers/scsi/virtio_scsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 112d8c3962b0..00cf6743db8c 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -144,7 +144,7 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf) set_host_byte(sc, DID_BAD_TARGET); break; case VIRTIO_SCSI_S_NEXUS_FAILURE: - set_host_byte(sc, DID_NEXUS_FAILURE); + set_status_byte(sc, SAM_STAT_RESERVATION_CONFLICT); break; default: scmd_printk(KERN_WARNING, sc, "Unknown response %d",
Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
