> -----Original Message----- > From: Jeff Leung [mailto:jleung@xxxxxxxxxxxxxx] > Sent: Monday, October 20, 2014 10:39 PM > To: linux-scsi@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx > Cc: KY Srinivasan; James.Bottomley@xxxxxxxxxxxxxxxxxxxxx; Jeff Leung > Subject: [PATCH] scsi: storvsc: Force SPC-3 for Win8 Hosts or Later > > 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@xxxxxxxxxxxxxxxxxxxxx> > Signed-off-by: Jeff Leung <jleung@xxxxxxxxxxxxxx> > --- > 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) { I would want this hack not to be in Windows 10. We can have this hack if the host is either Ws2012 or ws2012 r2 (VERSION_WIN8 or VERSION_WIN8_1). Also this hack should apply only to VHD's being presented and not pass through devices. K. Y > + sdevice->scsi_level = SCSI_SPC_3; > + } > + > return 0; > } > > -- > 1.7.2.5 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
