On Thu, May 30, 2019 at 01:28:09PM +0200, Paolo Bonzini wrote:
> This allows a list of requests to be issued, with the LLD only writing
> the hardware doorbell when necessary, after the last request was prepared.
> This is more efficient if we have lists of requests to issue, particularly
> on virtualized hardware, where writing the doorbell is more expensive than
> on real hardware.
> 
> This applies to any HBA, either singlequeue or multiqueue; the second
> patch implements it for virtio-scsi.
> 
> Paolo
> 
> Paolo Bonzini (2):
>   scsi_host: add support for request batching
>   virtio_scsi: implement request batching
> 
>  drivers/scsi/scsi_lib.c    | 37 ++++++++++++++++++++++---
>  drivers/scsi/virtio_scsi.c | 55 +++++++++++++++++++++++++++-----------
>  include/scsi/scsi_cmnd.h   |  1 +
>  include/scsi/scsi_host.h   | 16 +++++++++--
>  4 files changed, 89 insertions(+), 20 deletions(-)
> 
> -- 
> 2.21.0
> 

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>