qemu/hw/scsi
Daniel P. Berrange 070f80095a scsi-disk: support reporting of rotation rate
The Linux kernel will query the SCSI "Block device characteristics"
VPD to determine the rotations per minute of the disk. If this has
the value 1, it is taken to be an SSD and so Linux sets the
'rotational' flag to 0 for the I/O queue and will stop using that
disk as a source of random entropy. Other operating systems may
also take into account rotation rate when setting up default
behaviour.

Mgmt apps should be able to set the rotation rate for virtualized
block devices, based on characteristics of the host storage in use,
so that the guest OS gets sensible behaviour out of the box. This
patch thus adds a 'rotation-rate' parameter for 'scsi-hd' and
'scsi-block' device types. For the latter, this parameter will be
ignored unless the host device has TYPE_DISK.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <20171004114008.14849-2-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-10-12 12:10:37 +02:00
..
esp-pci.c hw/scsi: Concentrate -drive if=scsi auto-create in one place 2017-02-21 13:17:45 +01:00
esp.c scsi/esp: Rename the ESP macro to ESP_STATE 2017-09-19 14:09:33 +02:00
lsi53c895a.c migration: pre_save return int 2017-09-27 11:35:59 +01:00
Makefile.objs vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
megasas.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
mfi.h Clean up header guards that don't match their file name 2016-07-12 16:19:16 +02:00
mpi.h hw: Add support for LSI SAS1068 (mptsas) device 2016-02-09 15:45:26 +01:00
mptconfig.c scsi: mptconfig: fix misuse of MPTSAS_CONFIG_PACK 2016-09-13 19:08:46 +02:00
mptendian.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
mptsas.c osdep.h: Prohibit disabling assert() in supported builds 2017-09-19 16:20:49 +02:00
mptsas.h mptsas: really fix migration compatibility 2016-08-03 18:44:56 +02:00
scsi-bus.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
scsi-disk.c scsi-disk: support reporting of rotation rate 2017-10-12 12:10:37 +02:00
scsi-generic.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
spapr_vscsi.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
srp.h spapr-vscsi: add task management 2013-09-12 08:46:21 +02:00
trace-events trace-events: fix code style: print 0x before hex numbers 2017-08-01 12:13:07 +01:00
vhost-scsi-common.c vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
vhost-scsi.c migration: Create migration/blocker.h 2017-05-17 12:04:59 +02:00
vhost-user-scsi.c vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
viosrp.h hw: move private headers to hw/ subdirectories. 2013-04-08 18:13:16 +02:00
virtio-scsi-dataplane.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
virtio-scsi.c scsi: move block/scsi.h to include/scsi/constants.h 2017-09-19 14:09:31 +02:00
vmw_pvscsi.c migration: pre_save return int 2017-09-27 11:35:59 +01:00
vmw_pvscsi.h scsi: VMWare PVSCSI paravirtual device implementation 2013-04-19 10:44:17 +02:00