Commit 415ffdde authored Jul 12, 2016 by Tom Yan Committed by Tejun Heo Jul 12, 2016

libata-scsi: set CmdQue bit in standard INQUIRY data to 1

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>
Signed-off-by: Tejun Heo <tj@kernel.org>

parent 0c12735e

drivers/ata/libata-scsi.c

+4 −1

Original line number	Original line	Diff line number	Diff line
	@@ -2097,7 +2097,10 @@ static unsigned int ata_scsiop_inq_std(struct ata_scsi_args args, u8 rbuf)
	0,		0,
	0x5, /* claim SPC-3 version compatibility */		0x5, /* claim SPC-3 version compatibility */
	2,		2,
	95 - 4		95 - 4,
			0,
			0,
			2
	};		};

	VPRINTK("ENTER\n");		VPRINTK("ENTER\n");