7 files changed, 24 insertions, 14 deletions
diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c
index 3e660fb111b3..013c9e0e412c 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.c
+++ b/drivers/gpu/drm/xen/xen_drm_front.c
@@ -157,7 +157,8 @@ int xen_drm_front_mode_set(struct xen_drm_front_drm_pipeline *pipeline,
 
 int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
 			      u64 dbuf_cookie, u32 width, u32 height,
-			      u32 bpp, u64 size, struct page **pages)
+			      u32 bpp, u64 size, u32 offset,
+			      struct page **pages)
 {
 	struct xen_drm_front_evtchnl *evtchnl;
 	struct xen_drm_front_dbuf *dbuf;
@@ -194,6 +195,7 @@ int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
 	req->op.dbuf_create.gref_directory =
 			xen_front_pgdir_shbuf_get_dir_start(&dbuf->shbuf);
 	req->op.dbuf_create.buffer_sz = size;
+	req->op.dbuf_create.data_ofs = offset;
 	req->op.dbuf_create.dbuf_cookie = dbuf_cookie;
 	req->op.dbuf_create.width = width;
 	req->op.dbuf_create.height = height;
@@ -400,15 +402,15 @@ static int xen_drm_drv_dumb_create(struct drm_file *filp,
 	args->size = args->pitch * args->height;
 
 	obj = xen_drm_front_gem_create(dev, args->size);
-	if (IS_ERR_OR_NULL(obj)) {
-		ret = PTR_ERR_OR_ZERO(obj);
+	if (IS_ERR(obj)) {
+		ret = PTR_ERR(obj);
 		goto fail;
 	}
 
 	ret = xen_drm_front_dbuf_create(drm_info->front_info,
 					xen_drm_front_dbuf_to_cookie(obj),
 					args->width, args->height, args->bpp,
-					args->size,
+					args->size, 0,
 					xen_drm_front_gem_get_pages(obj));
 	if (ret)
 		goto fail_backend;
diff --git a/drivers/gpu/drm/xen/xen_drm_front.h b/drivers/gpu/drm/xen/xen_drm_front.h
index f92c258350ca..54486d89650e 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.h
+++ b/drivers/gpu/drm/xen/xen_drm_front.h
@@ -145,7 +145,7 @@ int xen_drm_front_mode_set(struct xen_drm_front_drm_pipeline *pipeline,
 
 int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
 			      u64 dbuf_cookie, u32 width, u32 height,
-			      u32 bpp, u64 size, struct page **pages);
+			      u32 bpp, u64 size, u32 offset, struct page **pages);
 
 int xen_drm_front_fb_attach(struct xen_drm_front_info *front_info,
 			    u64 dbuf_cookie, u64 fb_cookie, u32 width,
diff --git a/drivers/gpu/drm/xen/xen_drm_front_conn.c b/drivers/gpu/drm/xen/xen_drm_front_conn.c
index 459702fa990e..44f1f70c0aed 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_conn.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_conn.c
@@ -33,6 +33,7 @@ static const u32 plane_formats[] = {
 	DRM_FORMAT_ARGB4444,
 	DRM_FORMAT_XRGB1555,
 	DRM_FORMAT_ARGB1555,
+	DRM_FORMAT_YUYV,
 };
 
 const u32 *xen_drm_front_conn_get_formats(int *format_count)
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
index f0b85e094111..39ff95b75357 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -83,7 +83,7 @@ static struct xen_gem_object *gem_create(struct drm_device *dev, size_t size)
 
 	size = round_up(size, PAGE_SIZE);
 	xen_obj = gem_create_obj(dev, size);
-	if (IS_ERR_OR_NULL(xen_obj))
+	if (IS_ERR(xen_obj))
 		return xen_obj;
 
 	if (drm_info->front_info->cfg.be_alloc) {
@@ -117,7 +117,7 @@ static struct xen_gem_object *gem_create(struct drm_device *dev, size_t size)
 	 */
 	xen_obj->num_pages = DIV_ROUND_UP(size, PAGE_SIZE);
 	xen_obj->pages = drm_gem_get_pages(&xen_obj->base);
-	if (IS_ERR_OR_NULL(xen_obj->pages)) {
+	if (IS_ERR(xen_obj->pages)) {
 		ret = PTR_ERR(xen_obj->pages);
 		xen_obj->pages = NULL;
 		goto fail;
@@ -136,7 +136,7 @@ struct drm_gem_object *xen_drm_front_gem_create(struct drm_device *dev,
 	struct xen_gem_object *xen_obj;
 
 	xen_obj = gem_create(dev, size);
-	if (IS_ERR_OR_NULL(xen_obj))
+	if (IS_ERR(xen_obj))
 		return ERR_CAST(xen_obj);
 
 	return &xen_obj->base;
@@ -194,7 +194,7 @@ xen_drm_front_gem_import_sg_table(struct drm_device *dev,
 
 	size = attach->dmabuf->size;
 	xen_obj = gem_create_obj(dev, size);
-	if (IS_ERR_OR_NULL(xen_obj))
+	if (IS_ERR(xen_obj))
 		return ERR_CAST(xen_obj);
 
 	ret = gem_alloc_pages_array(xen_obj, size);
@@ -210,7 +210,8 @@ xen_drm_front_gem_import_sg_table(struct drm_device *dev,
 
 	ret = xen_drm_front_dbuf_create(drm_info->front_info,
 					xen_drm_front_dbuf_to_cookie(&xen_obj->base),
-					0, 0, 0, size, xen_obj->pages);
+					0, 0, 0, size, sgt->sgl->offset,
+					xen_obj->pages);
 	if (ret < 0)
 		return ERR_PTR(ret);
 
diff --git a/drivers/gpu/drm/xen/xen_drm_front_kms.c b/drivers/gpu/drm/xen/xen_drm_front_kms.c
index 78096bbcd226..ef11b1e4de39 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_kms.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_kms.c
@@ -60,7 +60,7 @@ fb_create(struct drm_device *dev, struct drm_file *filp,
 	int ret;
 
 	fb = drm_gem_fb_create_with_funcs(dev, filp, mode_cmd, &fb_funcs);
-	if (IS_ERR_OR_NULL(fb))
+	if (IS_ERR(fb))
 		return fb;
 
 	gem_obj = fb->obj[0];
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 1d339ef92422..ea6c1e7e3e42 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -52,9 +52,7 @@ config XEN_BALLOON_MEMORY_HOTPLUG
 
 config XEN_BALLOON_MEMORY_HOTPLUG_LIMIT
 	int "Hotplugged memory limit (in GiB) for a PV guest"
-	default 512 if X86_64
-	default 4 if X86_32
-	range 0 64 if X86_32
+	default 512
 	depends on XEN_HAVE_PVMMU
 	depends on XEN_BALLOON_MEMORY_HOTPLUG
 	help
diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c
index 75d3bb948bf3..b1b6eebafd5d 100644
--- a/drivers/xen/gntdev-dmabuf.c
+++ b/drivers/xen/gntdev-dmabuf.c
@@ -613,6 +613,14 @@ dmabuf_imp_to_refs(struct gntdev_dmabuf_priv *priv, struct device *dev,
 		goto fail_detach;
 	}
 
+	/* Check that we have zero offset. */
+	if (sgt->sgl->offset) {
+		ret = ERR_PTR(-EINVAL);
+		pr_debug("DMA buffer has %d bytes offset, user-space expects 0\n",
+			 sgt->sgl->offset);
+		goto fail_unmap;
+	}
+
 	/* Check number of pages that imported buffer has. */
 	if (attach->dmabuf->size != gntdev_dmabuf->nr_pages << PAGE_SHIFT) {
 		ret = ERR_PTR(-EINVAL);