On Mon, Feb 18, 2019 at 06:27:41PM +0800, elohi...@gmail.com wrote: > From: Xie Yongji <xieyon...@baidu.com> > > This patchset is aimed at supporting qemu to reconnect > vhost-user-blk backend after vhost-user-blk backend crash or > restart. > > The patch 1 introduces two new messages VHOST_USER_GET_INFLIGHT_FD > and VHOST_USER_SET_INFLIGHT_FD to support transferring shared > buffer between qemu and backend. > > The patch 2 deletes some redundant check in contrib/libvhost-user.c. > > The patch 3,4 are the corresponding libvhost-user patches of > patch 1. Make libvhost-user support VHOST_USER_GET_INFLIGHT_FD > and VHOST_USER_SET_INFLIGHT_FD. > > The patch 5 allows vhost-user-blk to use the two new messages > to get/set inflight buffer from/to backend. > > The patch 6 supports vhost-user-blk to reconnect backend when > connection closed. > > The patch 7 introduces VHOST_USER_PROTOCOL_F_SLAVE_SHMFD > to vhost-user-blk backend which is used to tell qemu that > we support reconnecting now. > > To use it, we could start qemu with: > > qemu-system-x86_64 \ > -chardev socket,id=char0,path=/path/vhost.socket,reconnect=1, \ > -device vhost-user-blk-pci,chardev=char0 \ > > and start vhost-user-blk backend with: > > vhost-user-blk -b /path/file -s /path/vhost.socket > > Then we can restart vhost-user-blk at any time during VM running.
Sorry is elohi...@gmail.com also an address that belongs to Xie Yongji? If not we need a signed off by from that address' owner as well. Thanks! > V5 to V6: > - Document the layout in inflight buffer for packed virtqueue > - Rework the layout in inflight buffer for split virtqueue > - Remove version field in VhostUserInflight > - Add a patch to remove some redundant check in > contrib/libvhost-user.c > - Document more details in vhost-user.txt > > V4 to V5: > - Drop patch that enables "nowait" option on client sockets > - Support resubmitting inflight I/O in order > - Make inflight I/O tracking more robust > - Remove align field and add queue size field in VhostUserInflight > - Document more details in vhost-user.txt > > V3 to V4: > - Drop messages VHOST_USER_GET_SHM_SIZE and VHOST_USER_SET_SHM_FD > - Introduce two new messages VHOST_USER_GET_INFLIGHT_FD > and VHOST_USER_SET_INFLIGHT_FD > - Allocate inflight buffer in backend rather than in qemu > - Document a recommended format for inflight buffer > > V2 to V3: > - Using exisiting wait/nowait options to control connection on > client sockets instead of introducing "disconnected" option. > - Support the case that vhost-user backend restart during initialzation > of vhost-user-blk device. > > V1 to V2: > - Introduce "disconnected" option for chardev instead of reuse "wait" > option > - Support the case that QEMU starts before vhost-user backend > - Drop message VHOST_USER_SET_VRING_INFLIGHT > - Introduce two new messages VHOST_USER_GET_SHM_SIZE > and VHOST_USER_SET_SHM_FD > > Xie Yongji (7): > vhost-user: Support transferring inflight buffer between qemu and > backend > libvhost-user: Remove unnecessary FD flag check for event file > descriptors > libvhost-user: Introduce vu_queue_map_desc() > libvhost-user: Support tracking inflight I/O in shared memory > vhost-user-blk: Add support to get/set inflight buffer > vhost-user-blk: Add support to reconnect backend > contrib/vhost-user-blk: enable inflight I/O tracking > > Makefile | 2 +- > contrib/libvhost-user/libvhost-user.c | 400 ++++++++++++++++++++---- > contrib/libvhost-user/libvhost-user.h | 58 ++++ > contrib/vhost-user-blk/vhost-user-blk.c | 3 +- > docs/interop/vhost-user.txt | 264 ++++++++++++++++ > hw/block/vhost-user-blk.c | 229 +++++++++++--- > hw/virtio/vhost-user.c | 107 +++++++ > hw/virtio/vhost.c | 96 ++++++ > include/hw/virtio/vhost-backend.h | 10 + > include/hw/virtio/vhost-user-blk.h | 5 + > include/hw/virtio/vhost.h | 18 ++ > 11 files changed, 1084 insertions(+), 108 deletions(-) > > -- > 2.17.1
