Il 20/08/2012 16:44, McPacino ha scritto: > > 在 2012-8-20 下午9:18，"Paolo Bonzini" <pbonz...@redhat.com > <mailto:pbonz...@redhat.com>>写道： >> >> Il 20/08/2012 11:03, Cong Meng ha scritto: >> > Each virtio scsi HBA has global request queue limits. But the > passthrough >> > LUNs (scsi-generic) come from different host HBAs may have different > request >> > queue limits. If the guest sends commands that exceed the host > limits, the >> > commands will be rejected by host HAB. >> > >> > To address this issue, this patch adds a per-LUN parameter query via > the control >> > queue, and defines some parameter query types. The driver can query > and set the >> > needed per-LUN parameters if the device enables this feature. >> > >> > Signed-off-by: Cong Meng <m...@linux.vnet.ibm.com > <mailto:m...@linux.vnet.ibm.com>> >> > -- >> > virtio-spec.lyx | 218 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> > 1 files changed, 218 insertions(+), 0 deletions(-) >> >> Do you have kernel and QEMU patches for this? That would help me >> evaluate whether the interface is the correct one. >> > yes,I have a demo. I will post it after I polish it tomorrow. > >> In any case, I'd rather have a single command returning all three values >> (VIRTIO_SCSI_T_LUN_QUEUE_PARAMS), since it's unlikely that you need just >> one. > > I intend to seperat them one by one. As there is opportunity that other > new parameters are needed for other features.
You can use more feature bits to dictate which bits are present. Paolo
