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Date: Mon, 28 Dec 2020 16:43:18 +0800 From: Jason Wang <jasowang@...hat.com> To: Yongji Xie <xieyongji@...edance.com> Cc: "Michael S. Tsirkin" <mst@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>, sgarzare@...hat.com, Parav Pandit <parav@...dia.com>, akpm@...ux-foundation.org, Randy Dunlap <rdunlap@...radead.org>, Matthew Wilcox <willy@...radead.org>, viro@...iv.linux.org.uk, axboe@...nel.dk, bcrl@...ck.org, corbet@....net, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, kvm@...r.kernel.org, linux-aio@...ck.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [RFC v2 09/13] vduse: Add support for processing vhost iotlb message On 2020/12/28 下午4:14, Yongji Xie wrote: >> I see. So all the above two questions are because VHOST_IOTLB_INVALIDATE >> is expected to be synchronous. This need to be solved by tweaking the >> current VDUSE API or we can re-visit to go with descriptors relaying first. >> > Actually all vdpa related operations are synchronous in current > implementation. The ops.set_map/dma_map/dma_unmap should not return > until the VDUSE_UPDATE_IOTLB/VDUSE_INVALIDATE_IOTLB message is replied > by userspace. Could it solve this problem? I was thinking whether or not we need to generate IOTLB_INVALIDATE message to VDUSE during dma_unmap (vduse_dev_unmap_page). If we don't, we're probably fine. Thanks > > Thanks, > Yongji >
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