[PATCH v2 13/15] vsock/virtio: reorder fields to reduce padding
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2026-01-05 08:23:50
Also in:
kvm, linux-crypto, linux-doc, linux-iommu, linux-scsi, lkml, virtualization
Subsystem:
networking [general], the rest, virtio and vhost vsock driver, virtio core, vm sockets (af_vsock) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Stefan Hajnoczi, Stefano Garzarella, "Michael S. Tsirkin", Jason Wang
Reorder struct virtio_vsock fields to place the DMA buffer (event_list) last. This eliminates the padding from aligning the struct size on ARCH_DMA_MINALIGN. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- net/vmw_vsock/virtio_transport.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index ef983c36cb66..964d25e11858 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c@@ -60,9 +60,7 @@ struct virtio_vsock { */ struct mutex event_lock; bool event_run; - __dma_from_device_group_begin(); - struct virtio_vsock_event event_list[8]; - __dma_from_device_group_end(); + u32 guest_cid; bool seqpacket_allow;
@@ -76,6 +74,10 @@ struct virtio_vsock { */ struct scatterlist *out_sgs[MAX_SKB_FRAGS + 1]; struct scatterlist out_bufs[MAX_SKB_FRAGS + 1]; + + __dma_from_device_group_begin(); + struct virtio_vsock_event event_list[8]; + __dma_from_device_group_end(); }; static u32 virtio_transport_get_local_cid(void)
--
MST