From: Michael S. Tsirkin Date: Mon, 29 Dec 2025 23:27:54 +0000 (-0500) Subject: vsock/virtio: use virtqueue_add_inbuf_cache_clean for events X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=db191ba0c8564ff84877e5b1c9553e991feca239;p=thirdparty%2Flinux.git vsock/virtio: use virtqueue_add_inbuf_cache_clean for events The event_list array contains 8 small (4-byte) events that share cachelines with each other. When CONFIG_DMA_API_DEBUG is enabled, this can trigger warnings about overlapping DMA mappings within the same cacheline. The previous patch isolated event_list in its own cache lines so the warnings are spurious. Use virtqueue_add_inbuf_cache_clean() to indicate that the CPU does not write into these fields, suppressing the warnings. Reported-by: Cong Wang Message-ID: <4b5bf63a7ebb782d87f643466b3669df567c9fe1.1767601130.git.mst@redhat.com> Acked-by: Stefano Garzarella Signed-off-by: Michael S. Tsirkin --- diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 3de2b2d49b51e..999a0839726a0 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -393,7 +393,7 @@ static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock, sg_init_one(&sg, event, sizeof(*event)); - return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL); + return virtqueue_add_inbuf_cache_clean(vq, &sg, 1, event, GFP_KERNEL); } /* event_lock must be held */