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authorTom Yan <tom.ty89@gmail.com>2016-07-12 16:29:34 +0300
committerTejun Heo <tj@kernel.org>2016-07-12 17:54:54 +0300
commit415ffdde15551769b24afe0e2021e231298773f8 (patch)
treec79eefd97e40204f9aacc5230dcfc85765e246f7 /drivers/ata
parent0c12735e8abf4734b011aec979092db5e63556b0 (diff)
downloadlinux-415ffdde15551769b24afe0e2021e231298773f8.tar.xz
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>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-scsi.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 3e79485e4937..b0d4bbaccca8 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");