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[RFC PATCH v3 5/7] virtio-gpu: Destroy virgl resources on virtio-gpu reset

Dmitry Osipenko posted 7 patches 8 hours ago
Maintainers: "Michael S. Tsirkin" <mst@redhat.com>, "Alex Bennée" <alex.bennee@linaro.org>, Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>, Dmitry Osipenko <dmitry.osipenko@collabora.com>
[RFC PATCH v3 5/7] virtio-gpu: Destroy virgl resources on virtio-gpu reset
Posted by Dmitry Osipenko 8 hours ago 
Properly destroy virgl resources on virtio-gpu reset to not leak resources
on a hot reboot of a VM.

Suggested-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-gl.c     |  6 ++-
 hw/display/virtio-gpu-virgl.c  | 79 +++++++++++++++++++++++++---------
 include/hw/virtio/virtio-gpu.h |  5 ++-
 3 files changed, 67 insertions(+), 23 deletions(-)

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index b640900fc6f1..bca7d489c1e3 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -72,7 +72,10 @@ static void virtio_gpu_gl_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 
     switch (gl->renderer_state) {
     case RS_RESET:
-        virtio_gpu_virgl_reset(g);
+        if (virtio_gpu_virgl_reset(g) < 0) {
+            gl->renderer_state = RS_INIT_FAILED;
+            return;
+        }
         /* fallthrough */
     case RS_START:
         if (virtio_gpu_virgl_init(g)) {
@@ -201,6 +204,7 @@ static void virtio_gpu_gl_class_init(ObjectClass *klass, const void *data)
     vgc->process_cmd = virtio_gpu_virgl_process_cmd;
     vgc->update_cursor_data = virtio_gpu_gl_update_cursor_data;
 
+    vgc->resource_destroy = virtio_gpu_virgl_resource_destroy;
     vdc->realize = virtio_gpu_gl_device_realize;
     vdc->unrealize = virtio_gpu_gl_device_unrealize;
     vdc->reset = virtio_gpu_gl_reset;
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index ae8de8ee47da..24d329022da9 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -311,14 +311,44 @@ static void virgl_cmd_create_resource_3d(VirtIOGPU *g,
     virgl_renderer_resource_create(&args, NULL, 0);
 }
 
+static int
+virtio_gpu_virgl_resource_unref(VirtIOGPU *g,
+                                struct virtio_gpu_virgl_resource *res,
+                                bool *cmd_suspended)
+{
+    struct iovec *res_iovs = NULL;
+    int num_iovs = 0;
+
+#if VIRGL_VERSION_MAJOR >= 1
+    if (virtio_gpu_virgl_unmap_resource_blob(g, res, cmd_suspended) < 0) {
+        return -1;
+    }
+    if (*cmd_suspended) {
+        return 0;
+    }
+#endif
+
+    virgl_renderer_resource_detach_iov(res->base.resource_id,
+                                       &res_iovs,
+                                       &num_iovs);
+    if (res_iovs != NULL && num_iovs != 0) {
+        virtio_gpu_cleanup_mapping_iov(g, res_iovs, num_iovs);
+    }
+    virgl_renderer_resource_unref(res->base.resource_id);
+
+    QTAILQ_REMOVE(&g->reslist, &res->base, next);
+
+    g_free(res);
+
+    return 0;
+}
+
 static void virgl_cmd_resource_unref(VirtIOGPU *g,
                                      struct virtio_gpu_ctrl_command *cmd,
                                      bool *cmd_suspended)
 {
     struct virtio_gpu_resource_unref unref;
     struct virtio_gpu_virgl_resource *res;
-    struct iovec *res_iovs = NULL;
-    int num_iovs = 0;
 
     VIRTIO_GPU_FILL_CMD(unref);
     trace_virtio_gpu_cmd_res_unref(unref.resource_id);
@@ -331,27 +361,21 @@ static void virgl_cmd_resource_unref(VirtIOGPU *g,
         return;
     }
 
-#if VIRGL_VERSION_MAJOR >= 1
-    if (virtio_gpu_virgl_unmap_resource_blob(g, res, cmd_suspended) < 0) {
-        cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
-        return;
-    }
-    if (*cmd_suspended) {
-        return;
-    }
-#endif
+    virtio_gpu_virgl_resource_unref(g, res, cmd_suspended);
+}
 
-    virgl_renderer_resource_detach_iov(unref.resource_id,
-                                       &res_iovs,
-                                       &num_iovs);
-    if (res_iovs != NULL && num_iovs != 0) {
-        virtio_gpu_cleanup_mapping_iov(g, res_iovs, num_iovs);
-    }
-    virgl_renderer_resource_unref(unref.resource_id);
+void virtio_gpu_virgl_resource_destroy(VirtIOGPU *g,
+                                       struct virtio_gpu_simple_resource *base,
+                                       Error **errp)
+{
+    struct virtio_gpu_virgl_resource *res;
+    bool suspended = false;
 
-    QTAILQ_REMOVE(&g->reslist, &res->base, next);
+    res = container_of(base, struct virtio_gpu_virgl_resource, base);
 
-    g_free(res);
+    if (virtio_gpu_virgl_resource_unref(g, res, &suspended) < 0) {
+        error_setg(errp, "failed to destroy virgl resource");
+    }
 }
 
 static void virgl_cmd_context_create(VirtIOGPU *g,
@@ -1270,11 +1294,24 @@ void virtio_gpu_virgl_reset_scanout(VirtIOGPU *g)
     }
 }
 
-void virtio_gpu_virgl_reset(VirtIOGPU *g)
+int virtio_gpu_virgl_reset(VirtIOGPU *g)
 {
+    struct virtio_gpu_simple_resource *res, *tmp;
+
+    QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
+        virtio_gpu_virgl_resource_destroy(g, res, NULL);
+    }
+
+    if (!QTAILQ_EMPTY(&g->reslist)) {
+        error_report("failed to reset virgl resources");
+        return -1;
+    }
+
     virgl_renderer_reset();
 
     virtio_gpu_virgl_reset_async_fences(g);
+
+    return 0;
 }
 
 int virtio_gpu_virgl_init(VirtIOGPU *g)
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 718332284305..9e1473d1bb66 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -389,9 +389,12 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
                                   struct virtio_gpu_ctrl_command *cmd);
 void virtio_gpu_virgl_fence_poll(VirtIOGPU *g);
 void virtio_gpu_virgl_reset_scanout(VirtIOGPU *g);
-void virtio_gpu_virgl_reset(VirtIOGPU *g);
+int virtio_gpu_virgl_reset(VirtIOGPU *g);
 int virtio_gpu_virgl_init(VirtIOGPU *g);
 GArray *virtio_gpu_virgl_get_capsets(VirtIOGPU *g);
 void virtio_gpu_virgl_reset_async_fences(VirtIOGPU *g);
+void virtio_gpu_virgl_resource_destroy(VirtIOGPU *g,
+                                       struct virtio_gpu_simple_resource *res,
+                                       Error **errp);
 
 #endif
-- 
2.51.1
Re: [RFC PATCH v3 5/7] virtio-gpu: Destroy virgl resources on virtio-gpu reset
Posted by Akihiko Odaki 7 hours ago 
On 2025/11/20 13:06, Dmitry Osipenko wrote:
> Properly destroy virgl resources on virtio-gpu reset to not leak resources
> on a hot reboot of a VM.
> 
> Suggested-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> ---
>   hw/display/virtio-gpu-gl.c     |  6 ++-
>   hw/display/virtio-gpu-virgl.c  | 79 +++++++++++++++++++++++++---------
>   include/hw/virtio/virtio-gpu.h |  5 ++-
>   3 files changed, 67 insertions(+), 23 deletions(-)
> 
> diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
> index b640900fc6f1..bca7d489c1e3 100644
> --- a/hw/display/virtio-gpu-gl.c
> +++ b/hw/display/virtio-gpu-gl.c
> @@ -72,7 +72,10 @@ static void virtio_gpu_gl_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
>   
>       switch (gl->renderer_state) {
>       case RS_RESET:
> -        virtio_gpu_virgl_reset(g);
> +        if (virtio_gpu_virgl_reset(g) < 0) {
> +            gl->renderer_state = RS_INIT_FAILED;
> +            return;
> +        }
>           /* fallthrough */
>       case RS_START:
>           if (virtio_gpu_virgl_init(g)) {
> @@ -201,6 +204,7 @@ static void virtio_gpu_gl_class_init(ObjectClass *klass, const void *data)
>       vgc->process_cmd = virtio_gpu_virgl_process_cmd;
>       vgc->update_cursor_data = virtio_gpu_gl_update_cursor_data;
>   
> +    vgc->resource_destroy = virtio_gpu_virgl_resource_destroy;
>       vdc->realize = virtio_gpu_gl_device_realize;
>       vdc->unrealize = virtio_gpu_gl_device_unrealize;
>       vdc->reset = virtio_gpu_gl_reset;
> diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
> index ae8de8ee47da..24d329022da9 100644
> --- a/hw/display/virtio-gpu-virgl.c
> +++ b/hw/display/virtio-gpu-virgl.c
> @@ -311,14 +311,44 @@ static void virgl_cmd_create_resource_3d(VirtIOGPU *g,
>       virgl_renderer_resource_create(&args, NULL, 0);
>   }
>   
> +static int
> +virtio_gpu_virgl_resource_unref(VirtIOGPU *g,
> +                                struct virtio_gpu_virgl_resource *res,
> +                                bool *cmd_suspended)
> +{
> +    struct iovec *res_iovs = NULL;
> +    int num_iovs = 0;
> +
> +#if VIRGL_VERSION_MAJOR >= 1
> +    if (virtio_gpu_virgl_unmap_resource_blob(g, res, cmd_suspended) < 0) {
> +        return -1;
> +    }
> +    if (*cmd_suspended) {
> +        return 0;
> +    }
> +#endif
> +
> +    virgl_renderer_resource_detach_iov(res->base.resource_id,
> +                                       &res_iovs,
> +                                       &num_iovs);
> +    if (res_iovs != NULL && num_iovs != 0) {
> +        virtio_gpu_cleanup_mapping_iov(g, res_iovs, num_iovs);
> +    }
> +    virgl_renderer_resource_unref(res->base.resource_id);
> +
> +    QTAILQ_REMOVE(&g->reslist, &res->base, next);
> +
> +    g_free(res);
> +
> +    return 0;
> +}
> +
>   static void virgl_cmd_resource_unref(VirtIOGPU *g,
>                                        struct virtio_gpu_ctrl_command *cmd,
>                                        bool *cmd_suspended)
>   {
>       struct virtio_gpu_resource_unref unref;
>       struct virtio_gpu_virgl_resource *res;
> -    struct iovec *res_iovs = NULL;
> -    int num_iovs = 0;
>   
>       VIRTIO_GPU_FILL_CMD(unref);
>       trace_virtio_gpu_cmd_res_unref(unref.resource_id);
> @@ -331,27 +361,21 @@ static void virgl_cmd_resource_unref(VirtIOGPU *g,
>           return;
>       }
>   
> -#if VIRGL_VERSION_MAJOR >= 1
> -    if (virtio_gpu_virgl_unmap_resource_blob(g, res, cmd_suspended) < 0) {
> -        cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
> -        return;
> -    }
> -    if (*cmd_suspended) {
> -        return;
> -    }
> -#endif
> +    virtio_gpu_virgl_resource_unref(g, res, cmd_suspended);
> +}
>   
> -    virgl_renderer_resource_detach_iov(unref.resource_id,
> -                                       &res_iovs,
> -                                       &num_iovs);
> -    if (res_iovs != NULL && num_iovs != 0) {
> -        virtio_gpu_cleanup_mapping_iov(g, res_iovs, num_iovs);
> -    }
> -    virgl_renderer_resource_unref(unref.resource_id);
> +void virtio_gpu_virgl_resource_destroy(VirtIOGPU *g,
> +                                       struct virtio_gpu_simple_resource *base,
> +                                       Error **errp)
> +{
> +    struct virtio_gpu_virgl_resource *res;
> +    bool suspended = false;
>   
> -    QTAILQ_REMOVE(&g->reslist, &res->base, next);
> +    res = container_of(base, struct virtio_gpu_virgl_resource, base);
>   
> -    g_free(res);
> +    if (virtio_gpu_virgl_resource_unref(g, res, &suspended) < 0) {
> +        error_setg(errp, "failed to destroy virgl resource");
> +    }
>   }
>   
>   static void virgl_cmd_context_create(VirtIOGPU *g,
> @@ -1270,11 +1294,24 @@ void virtio_gpu_virgl_reset_scanout(VirtIOGPU *g)
>       }
>   }
>   
> -void virtio_gpu_virgl_reset(VirtIOGPU *g)
> +int virtio_gpu_virgl_reset(VirtIOGPU *g)
>   {
> +    struct virtio_gpu_simple_resource *res, *tmp;
> +
> +    QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
> +        virtio_gpu_virgl_resource_destroy(g, res, NULL);
> +    }
> +
> +    if (!QTAILQ_EMPTY(&g->reslist)) {
> +        error_report("failed to reset virgl resources");
> +        return -1;

It shouldn't report an error if suspended.

> +    }
> +
>       virgl_renderer_reset();
>   
>       virtio_gpu_virgl_reset_async_fences(g);
> +
> +    return 0;
>   }
>   
>   int virtio_gpu_virgl_init(VirtIOGPU *g)
> diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
> index 718332284305..9e1473d1bb66 100644
> --- a/include/hw/virtio/virtio-gpu.h
> +++ b/include/hw/virtio/virtio-gpu.h
> @@ -389,9 +389,12 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
>                                     struct virtio_gpu_ctrl_command *cmd);
>   void virtio_gpu_virgl_fence_poll(VirtIOGPU *g);
>   void virtio_gpu_virgl_reset_scanout(VirtIOGPU *g);
> -void virtio_gpu_virgl_reset(VirtIOGPU *g);
> +int virtio_gpu_virgl_reset(VirtIOGPU *g);
>   int virtio_gpu_virgl_init(VirtIOGPU *g);
>   GArray *virtio_gpu_virgl_get_capsets(VirtIOGPU *g);
>   void virtio_gpu_virgl_reset_async_fences(VirtIOGPU *g);
> +void virtio_gpu_virgl_resource_destroy(VirtIOGPU *g,
> +                                       struct virtio_gpu_simple_resource *res,
> +                                       Error **errp);
>   
>   #endif

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