Re: [PATCH vhost v11 10/10] virtio_net: merge dma operation for one page
From: Christoph Hellwig <hch@infradead.org>
Date: 2023-07-20 08:21:53
Also in:
bpf, virtualization
On Thu, Jul 20, 2023 at 03:41:56PM +0800, Jason Wang wrote:
quoted
Did you actually check that it works though? Looks like with swiotlb you need to synch to trigger a copy before unmap, and I don't see where it's done in the current patch.And this is needed for XDP_REDIRECT as well.
DMA always needs proper syncs, be that for swiotlb or for cache maintainance, yes.