This helper function provides a way to determine if a ram block is backed by memfd by checking the SEALS on the associated fd. This is useful in scenarios where we need to quickly verify if a given memory region is associated with a memfd or not.
Cc: Marc-André Lureau <[email protected]> Cc: Alex Bennée <[email protected]> Cc: Akihiko Odaki <[email protected]> Cc: Dmitry Osipenko <[email protected]> Cc: Alex Williamson <[email protected]> Cc: Cédric Le Goater <[email protected]> Signed-off-by: Vivek Kasireddy <[email protected]> --- hw/display/virtio-gpu-dmabuf.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/hw/display/virtio-gpu-dmabuf.c b/hw/display/virtio-gpu-dmabuf.c index c34d4c85bc..258c48d31b 100644 --- a/hw/display/virtio-gpu-dmabuf.c +++ b/hw/display/virtio-gpu-dmabuf.c @@ -27,6 +27,19 @@ #include "standard-headers/linux/udmabuf.h" #include "standard-headers/drm/drm_fourcc.h" +static bool ram_block_is_memfd_backed(RAMBlock *rb) +{ + int ret; + + if (rb && rb->fd > 0) { + ret = fcntl(rb->fd, F_GET_SEALS); + if (ret > 0) { + return true; + } + } + return false; +} + static void virtio_gpu_create_udmabuf(struct virtio_gpu_simple_resource *res) { struct udmabuf_create_list *list; @@ -94,20 +107,14 @@ static void virtio_gpu_destroy_dmabuf(struct virtio_gpu_simple_resource *res) static int find_memory_backend_type(Object *obj, void *opaque) { bool *memfd_backend = opaque; - int ret; if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) { HostMemoryBackend *backend = MEMORY_BACKEND(obj); - RAMBlock *rb = backend->mr.ram_block; - if (rb && rb->fd > 0) { - ret = fcntl(rb->fd, F_GET_SEALS); - if (ret > 0) { - *memfd_backend = true; - } + if (ram_block_is_memfd_backed(backend->mr.ram_block)) { + *memfd_backend = true; } } - return 0; } -- 2.50.1
