[PATCH v5 0/1] virtio-gpu: CONTEXT_INIT feature

[PATCH v5 0/1] virtio-gpu: CONTEXT_INIT feature

[Antonio Caggiano]

This is a different attempt at upstreaming the work I have been doing to
enable support for the Venus Virtio-GPU Vulkan driver.

I believe the previous one [0] was a bit too much stuff in one place,
therefore with this I would like to try a more fine-grained approach.

I will just start by the CONTEXT_INIT feature as it was the first commit
of the series aforementioned and the virtio-spec has been updated
recently on that regard [1]. Hopefully this would also answer Gerd's
comment on the previous patch [2].

[0] https://www.mail-archive.com/qemu-devel@nongnu.org/msg826897.html
[1] https://github.com/oasis-tcs/virtio-spec/commit/aad2b6f3620ec0c9d16aaf046db8c282c24cce3e
[2] https://www.mail-archive.com/qemu-devel@nongnu.org/msg827304.html

Antonio Caggiano (1):
  virtio-gpu: CONTEXT_INIT feature

 hw/display/virtio-gpu-base.c   |  3 +++
 hw/display/virtio-gpu-virgl.c  | 16 ++++++++++++++--
 hw/display/virtio-gpu.c        |  2 ++
 include/hw/virtio/virtio-gpu.h |  3 +++
 meson.build                    |  5 +++++
 5 files changed, 27 insertions(+), 2 deletions(-)

-- 
2.34.1

[PATCH v5 1/1] virtio-gpu: CONTEXT_INIT feature

[Antonio Caggiano]

Create virgl renderer context with flags using context_id when valid.
The feature can be enabled via the context_init config option.
A warning message will be emitted and the feature will not be used
when linking with virglrenderer versions without context_init support.

Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
v2:
- The feature can be enabled via the context_init config option.
- A warning message will be emitted and the feature will not be used
  when linking with virglrenderer versions without context_init support.
v3: Define HAVE_VIRGL_CONTEXT_INIT in config_host_data.
v5: Move changelog under "---"

 hw/display/virtio-gpu-base.c   |  3 +++
 hw/display/virtio-gpu-virgl.c  | 16 ++++++++++++++--
 hw/display/virtio-gpu.c        |  2 ++
 include/hw/virtio/virtio-gpu.h |  3 +++
 meson.build                    |  5 +++++
 5 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
index a29f191aa8..6c5f1f327f 100644
--- a/hw/display/virtio-gpu-base.c
+++ b/hw/display/virtio-gpu-base.c
@@ -215,6 +215,9 @@ virtio_gpu_base_get_features(VirtIODevice *vdev, uint64_t features,
     if (virtio_gpu_blob_enabled(g->conf)) {
         features |= (1 << VIRTIO_GPU_F_RESOURCE_BLOB);
     }
+    if (virtio_gpu_context_init_enabled(g->conf)) {
+        features |= (1 << VIRTIO_GPU_F_CONTEXT_INIT);
+    }
 
     return features;
 }
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 73cb92c8d5..274cbc44de 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -97,8 +97,20 @@ static void virgl_cmd_context_create(VirtIOGPU *g,
     trace_virtio_gpu_cmd_ctx_create(cc.hdr.ctx_id,
                                     cc.debug_name);
 
-    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen,
-                                  cc.debug_name);
+    if (cc.context_init) {
+#ifdef HAVE_VIRGL_CONTEXT_INIT
+        virgl_renderer_context_create_with_flags(cc.hdr.ctx_id,
+                                                 cc.context_init,
+                                                 cc.nlen,
+                                                 cc.debug_name);
+        return;
+#else
+        qemu_log_mask(LOG_UNIMP,
+                      "Linked virglrenderer does not support context-init\n");
+#endif
+    }
+    
+    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen, cc.debug_name);
 }
 
 static void virgl_cmd_context_destroy(VirtIOGPU *g,
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 20cc703dcc..fa667ec234 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1424,6 +1424,8 @@ static Property virtio_gpu_properties[] = {
                      256 * MiB),
     DEFINE_PROP_BIT("blob", VirtIOGPU, parent_obj.conf.flags,
                     VIRTIO_GPU_FLAG_BLOB_ENABLED, false),
+    DEFINE_PROP_BIT("context_init", VirtIOGPU, parent_obj.conf.flags,
+                    VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 2e28507efe..c6f5cfde47 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -90,6 +90,7 @@ enum virtio_gpu_base_conf_flags {
     VIRTIO_GPU_FLAG_EDID_ENABLED,
     VIRTIO_GPU_FLAG_DMABUF_ENABLED,
     VIRTIO_GPU_FLAG_BLOB_ENABLED,
+    VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED,
 };
 
 #define virtio_gpu_virgl_enabled(_cfg) \
@@ -102,6 +103,8 @@ enum virtio_gpu_base_conf_flags {
     (_cfg.flags & (1 << VIRTIO_GPU_FLAG_DMABUF_ENABLED))
 #define virtio_gpu_blob_enabled(_cfg) \
     (_cfg.flags & (1 << VIRTIO_GPU_FLAG_BLOB_ENABLED))
+#define virtio_gpu_context_init_enabled(_cfg) \
+    (_cfg.flags & (1 << VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED))
 
 struct virtio_gpu_base_conf {
     uint32_t max_outputs;
diff --git a/meson.build b/meson.build
index c2adb7caf4..08303e7aac 100644
--- a/meson.build
+++ b/meson.build
@@ -718,6 +718,11 @@ if not get_option('virglrenderer').auto() or have_system or have_vhost_user_gpu
                      method: 'pkg-config',
                      required: get_option('virglrenderer'),
                      kwargs: static_kwargs)
+
+  config_host_data.set('HAVE_VIRGL_CONTEXT_INIT',
+                       cc.has_function('virgl_renderer_context_create_with_flags',
+                                       prefix: '#include <virglrenderer.h>',
+                                       dependencies: virgl))
 endif
 curl = not_found
 if not get_option('curl').auto() or have_block
-- 
2.34.1