From 4fc0a3ca721da2bfbab0fdf248bd76d7e6bc232f Mon Sep 17 00:00:00 2001
From: Zhenyu Wang <zhenyuw@linux.intel.com>
Date: Thu, 12 Dec 2019 16:46:14 +0800
Subject: drm/i915/gvt: set guest display buffer as readonly
Git-commit: 4fc0a3ca721da2bfbab0fdf248bd76d7e6bc232f
Patch-mainline: v5.5-rc3
References: bsc#1112178

We shouldn't allow write for exposed guest display buffer which
doesn't make sense. So explicitly set read only flag for display
dmabuf allocated object.

Fixes: e546e281d33d ("drm/i915/gvt: Dmabuf support for GVT-g")
Cc: Tina Zhang <tina.zhang@intel.com>
Acked-by: Tina Zhang <tina.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20191212084614.1100-1-zhenyuw@linux.intel.com
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/i915/gvt/dmabuf.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/gvt/dmabuf.c
+++ b/drivers/gpu/drm/i915/gvt/dmabuf.c
@@ -161,6 +161,7 @@ static struct drm_i915_gem_object *vgpu_
 	drm_gem_private_object_init(dev, &obj->base,
 		info->size << PAGE_SHIFT);
 	i915_gem_object_init(obj, &intel_vgpu_gem_ops);
+	i915_gem_object_set_readonly(obj);
 
 	obj->read_domains = I915_GEM_DOMAIN_GTT;
 	obj->write_domain = 0;