linux-kernel - [PATCH v1 1/2] drm/virtio: Don't attach GEM to a non-created context in gem_object

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Message-ID: <20250326014902.379339-1-dmitry.osipenko@collabora.com>
Date: Wed, 26 Mar 2025 04:49:01 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: David Airlie <airlied@...hat.com>,
	Gerd Hoffmann <kraxel@...hat.com>,
	Gurchetan Singh <gurchetansingh@...omium.org>,
	Chia-I Wu <olvaffe@...il.com>,
	Vivek Kasireddy <vivek.kasireddy@...el.com>,
	Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
Cc: dri-devel@...ts.freedesktop.org,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	kernel@...labora.com
Subject: [PATCH v1 1/2] drm/virtio: Don't attach GEM to a non-created context in gem_object_open()

The vfpriv->ctx_id is always initialized to a non-zero value. Check whether
context was created before attaching GEM to this context ID. This left
unnoticed previously because host silently skips attachment if context
doesn't exist, still we shouldn't do that for consistency.

Fixes: 086b9f27f0ab ("drm/virtio: Don't create a context with default param if context_init is supported")
Cc: <stable@...r.kernel.org> # v6.14+
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
---
 drivers/gpu/drm/virtio/virtgpu_gem.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
index dde8fc1a3689..90c99d83c4cf 100644
--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -115,13 +115,14 @@ int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 	if (!vgdev->has_context_init)
 		virtio_gpu_create_context(obj->dev, file);
 
-	objs = virtio_gpu_array_alloc(1);
-	if (!objs)
-		return -ENOMEM;
-	virtio_gpu_array_add_obj(objs, obj);
+	if (vfpriv->context_created) {
+		objs = virtio_gpu_array_alloc(1);
+		if (!objs)
+			return -ENOMEM;
+		virtio_gpu_array_add_obj(objs, obj);
 
-	if (vfpriv->ctx_id)
 		virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id, objs);
+	}
 
 out_notify:
 	virtio_gpu_notify(vgdev);
-- 
2.49.0