[v2 3/3] virtio-gpu: Add VIRTIO_GPU_F_RESOURCE_USERPTR feature support

[Honglei Huang <honghuan@amd.com>]

This patch introduces support for the VIRTIO_GPU_F_RESOURCE_USERPTR feature
in virtio-gpu implementation:

- Add VIRTIO_GPU_F_RESOURCE_USERPTR feature flag definition
- Implement resource_userptr property as a configurable option
- Add VIRTIO_GPU_FLAG_RESOURCE_USERPTR_ENABLED configuration flag
- Enable feature negotiation when resource_userptr is enabled

Usage:
  -device virtio-gpu-gl,userptr=on

This feature allows virtio-gpu to support user pointer resources,
enhancing memory management capabilities for GPU virtualization
scenarios.

Signed-off-by: Honglei Huang <honghuan@amd.com>
---
 hw/display/virtio-gpu-base.c                | 3 +++
 hw/display/virtio-gpu.c                     | 2 ++
 include/hw/virtio/virtio-gpu.h              | 3 +++
 include/standard-headers/linux/virtio_gpu.h | 2 ++
 4 files changed, 10 insertions(+)

diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
index 7269477a1c..f013a4ece6 100644
--- a/hw/display/virtio-gpu-base.c
+++ b/hw/display/virtio-gpu-base.c
@@ -264,6 +264,9 @@ virtio_gpu_base_get_features(VirtIODevice *vdev, uint64_t features,
     if (virtio_gpu_resource_uuid_enabled(g->conf)) {
         features |= (1 << VIRTIO_GPU_F_RESOURCE_UUID);
     }
+    if (virtio_gpu_resource_userptr_enabled(g->conf)) {
+        features |= (1 << VIRTIO_GPU_F_RESOURCE_USERPTR);
+    }
 
     return features;
 }
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 956dc811fa..5f1dc80060 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1685,6 +1685,8 @@ static const Property virtio_gpu_properties[] = {
                      256 * MiB),
     DEFINE_PROP_BIT("blob", VirtIOGPU, parent_obj.conf.flags,
                     VIRTIO_GPU_FLAG_BLOB_ENABLED, false),
+    DEFINE_PROP_BIT("userptr", VirtIOGPU, parent_obj.conf.flags,
+                    VIRTIO_GPU_FLAG_RESOURCE_USERPTR_ENABLED, false),
     DEFINE_PROP_SIZE("hostmem", VirtIOGPU, parent_obj.conf.hostmem, 0),
     DEFINE_PROP_UINT8("x-scanout-vmstate-version", VirtIOGPU, scanout_vmstate_version, 2),
 };
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index c820247db8..ff68f3c451 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -101,6 +101,7 @@ enum virtio_gpu_base_conf_flags {
     VIRTIO_GPU_FLAG_VENUS_ENABLED,
     VIRTIO_GPU_FLAG_RESOURCE_UUID_ENABLED,
     VIRTIO_GPU_FLAG_HSAKMT_ENABLED,
+    VIRTIO_GPU_FLAG_RESOURCE_USERPTR_ENABLED,
 };
 
 #define virtio_gpu_virgl_enabled(_cfg) \
@@ -125,6 +126,8 @@ enum virtio_gpu_base_conf_flags {
     (_cfg.flags & (1 << VIRTIO_GPU_FLAG_VENUS_ENABLED))
 #define virtio_gpu_hsakmt_enabled(_cfg) \
     (_cfg.flags & (1 << VIRTIO_GPU_FLAG_HSAKMT_ENABLED))
+#define virtio_gpu_resource_userptr_enabled(_cfg) \
+    (_cfg.flags & (1 << VIRTIO_GPU_FLAG_RESOURCE_USERPTR_ENABLED))
 
 struct virtio_gpu_base_conf {
     uint32_t max_outputs;
diff --git a/include/standard-headers/linux/virtio_gpu.h b/include/standard-headers/linux/virtio_gpu.h
index 6c54cb745f..321477598e 100644
--- a/include/standard-headers/linux/virtio_gpu.h
+++ b/include/standard-headers/linux/virtio_gpu.h
@@ -65,6 +65,8 @@
  */
 #define VIRTIO_GPU_F_CONTEXT_INIT        4
 
+#define VIRTIO_GPU_F_RESOURCE_USERPTR    5
+
 enum virtio_gpu_ctrl_type {
 	VIRTIO_GPU_UNDEFINED = 0,
 
-- 
2.34.1