lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 28 Dec 2020 17:12:44 +0800 From: Yongji Xie <xieyongji@...edance.com> To: Jason Wang <jasowang@...hat.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: Re: [RFC v2 09/13] vduse: Add support for processing vhost iotlb message On Mon, Dec 28, 2020 at 4:43 PM Jason Wang <jasowang@...hat.com> wrote: > > > 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. > It seems not feasible. This message will be also used in the virtio-vdpa case to notify userspace to unmap some pages during consistent dma unmapping. Maybe we can document it to make sure the users can handle the message correctly. Thanks, Yongji
Powered by blists - more mailing lists