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[resend,1/2] libata-scsi: set CmdQue bit in standard INQUIRY data to 1

Message ID 5784f0c4.8469620a.ab9e4.ffff9997@mx.google.com
State Not Applicable
Delegated to: David Miller
Headers show

Commit Message

Tom Yan July 12, 2016, 1:29 p.m. UTC 
From: Tom Yan <tom.ty89@gmail.com>

Avoid performance bottleneck when being SCSI pass-through'd to
virtual machines with other OSes (e.g. Windows) via virtio-scsi
and scsi-block in qemu.

Ref.: https://github.com/YanVugenfirer/kvm-guest-drivers-windows/issues/63

Signed-off-by: Tom Yan <tom.ty89@gmail.com>
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Patch

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index bfec66f..0a35164 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2097,7 +2097,10 @@  static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
 		0,
 		0x5,	/* claim SPC-3 version compatibility */
 		2,
-		95 - 4
+		95 - 4,
+		0,
+		0,
+		2
 	};
 
 	VPRINTK("ENTER\n");