linux-kernel - [PATCH v5 2/5] virtio-gpu api: add blob userptr resource

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Message-ID: <20260116083808.325180-3-honglei1.huang@amd.com>
Date: Fri, 16 Jan 2026 16:38:05 +0800
From: Honglei Huang <honglei1.huang@....com>
To: David Airlie <airlied@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>,
	Dmitry Osipenko <dmitry.osipenko@...labora.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, Simona Vetter <simona@...ll.ch>,
	<Ray.Huang@....com>
CC: Gurchetan Singh <gurchetansingh@...omium.org>,
	<odaki@....ci.i.u-tokyo.ac.jp>, Chia-I Wu <olvaffe@...il.com>,
	<dri-devel@...ts.freedesktop.org>, <virtualization@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, Honglei Huang <Honglei1.Huang@....com>
Subject: [PATCH v5 2/5] virtio-gpu api: add blob userptr resource

From: Honglei Huang <Honglei1.Huang@....com>

Add a new resource for blob resource, called userptr, used for let
host access guest user space memory, to acquire buffer based userptr
feature in virtio GPU.

- New flag VIRTIO_GPU_BLOB_FLAG_USE_USERPTR used in blob create
to indicate the blob create ioctl is used for create a userptr
blob resource.
- VIRTIO_GPU_BLOB_FLAG_USERPTR_RDONLY: Indicates that the user pointer
  resource is read-only.

Signed-off-by: Honglei Huang <Honglei1.Huang@....com>
---
 include/uapi/linux/virtio_gpu.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h
index fbd1838d6..436c8aa25 100644
--- a/include/uapi/linux/virtio_gpu.h
+++ b/include/uapi/linux/virtio_gpu.h
@@ -406,6 +406,8 @@ struct virtio_gpu_resource_create_blob {
 #define VIRTIO_GPU_BLOB_FLAG_USE_MAPPABLE     0x0001
 #define VIRTIO_GPU_BLOB_FLAG_USE_SHAREABLE    0x0002
 #define VIRTIO_GPU_BLOB_FLAG_USE_CROSS_DEVICE 0x0004
+#define VIRTIO_GPU_BLOB_FLAG_USE_USERPTR      0x0008
+#define VIRTIO_GPU_BLOB_FLAG_USERPTR_RDONLY   0x0010
 	/* zero is invalid blob mem */
 	__le32 blob_mem;
 	__le32 blob_flags;
-- 
2.34.1