From 9f591ae60e1be026901398ef99eede91237aa3a1 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 21 Mar 2018 15:08:47 +0100
Subject: [PATCH] drm/i915/gvt: throw error on unhandled vfio ioctls
Git-commit: 9f591ae60e1be026901398ef99eede91237aa3a1
Patch-mainline: v4.17-rc2
References: bsc#1051510

On unknown/unhandled ioctls the driver should return an error, so
userspace knows it tried to use something unsupported.

Cc: stable@vger.kernel.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/gvt/kvmgt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1301,7 +1301,7 @@ static long intel_vgpu_ioctl(struct mdev
 
 	}
 
-	return 0;
+	return -ENOTTY;
 }
 
 static ssize_t