Messages in this thread Patch in this message |  | | From | Jeff Leung <> | Subject | [PATCH] scsi: storvsc: Force SPC-3 for Win8 Hosts or Later | Date | Tue, 21 Oct 2014 05:32:03 +0000 |
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This patch forces SPC-3 for Hyper-V disks on the VMBus. As Windows 10's virtual SAS bus is SPC-3 compliant and there are no negative side effects on forcing SPC-3 compliance for Win8 hosts, this patch enables SPC-3 compliance by forcing it on for hosts with versions later than Win8.
Forcing SPC-3 compliance for hosts earlier than Win10 also enables TRIM support.
Suggested by: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Jeff Leung <jleung@v10networks.ca> --- drivers/scsi/storvsc_drv.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index ed0f899..afcc68e 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -1449,6 +1449,15 @@ static int storvsc_device_configure(struct scsi_device *sdevice) sdevice->no_write_same = 1; + /* + * If the host is Win2k12 or later, we pretend to be SPC-3 compliant + * and send RC16 which activates TRIM. We will only enable this on a + * host with levels greater than VERSION_WIN8 + */ + if (vmbus_proto_version >= VERSION_WIN8) { + sdevice->scsi_level = SCSI_SPC_3; + } + return 0; } -- 1.7.2.5
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