Shared memory buffers for software-rendered GUI applications are often large and highly fragmented in memory. To get a shareable handle to such a buffer from a guest VM, a virtio-gpu device backend can use the UDMABUF_CREATE_LIST ioctl with the memfds backing guest RAM and the list of guest physical pages sent by the guest driver. That list reaches 80K entries for a maximized window on a 4K display!
Increase the default limit to 131072. Signed-off-by: Val Packett <[email protected]> --- drivers/dma-buf/udmabuf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index 654ebe7f6b3f..dd913f9f3b06 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -16,9 +16,9 @@ #include <linux/vmalloc.h> #include <linux/iosys-map.h> -static int list_limit = 1024; +static int list_limit = 131072; module_param(list_limit, int, 0644); -MODULE_PARM_DESC(list_limit, "udmabuf_create_list->count limit. Default is 1024."); +MODULE_PARM_DESC(list_limit, "udmabuf_create_list->count limit. Default is 131072."); static int size_limit_mb = INT_MAX; module_param(size_limit_mb, int, 0644); -- 2.55.0
