From 5ad204bf2a06bf29234df9e6f1ef6c566771b40c Mon Sep 17 00:00:00 2001 From: Xie Yongji Date: Thu, 28 Feb 2019 16:53:49 +0800 Subject: vhost-user: Support transferring inflight buffer between qemu and backend This patch introduces two new messages VHOST_USER_GET_INFLIGHT_FD and VHOST_USER_SET_INFLIGHT_FD to support transferring a shared buffer between qemu and backend. Firstly, qemu uses VHOST_USER_GET_INFLIGHT_FD to get the shared buffer from backend. Then qemu should send it back through VHOST_USER_SET_INFLIGHT_FD each time we start vhost-user. This shared buffer is used to track inflight I/O by backend. Qemu should retrieve a new one when vm reset. Signed-off-by: Xie Yongji Signed-off-by: Chai Wen Signed-off-by: Zhang Yu Message-Id: <20190228085355.9614-2-xieyongji@baidu.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/hw/virtio/vhost.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'include/hw/virtio/vhost.h') diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index a7f449f..619498c 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -7,6 +7,15 @@ #include "exec/memory.h" /* Generic structures common for any vhost based device. */ + +struct vhost_inflight { + int fd; + void *addr; + uint64_t size; + uint64_t offset; + uint16_t queue_size; +}; + struct vhost_virtqueue { int kick; int call; @@ -120,4 +129,13 @@ int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *data, */ void vhost_dev_set_config_notifier(struct vhost_dev *dev, const VhostDevConfigOps *ops); + +void vhost_dev_reset_inflight(struct vhost_inflight *inflight); +void vhost_dev_free_inflight(struct vhost_inflight *inflight); +void vhost_dev_save_inflight(struct vhost_inflight *inflight, QEMUFile *f); +int vhost_dev_load_inflight(struct vhost_inflight *inflight, QEMUFile *f); +int vhost_dev_set_inflight(struct vhost_dev *dev, + struct vhost_inflight *inflight); +int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size, + struct vhost_inflight *inflight); #endif -- cgit v1.1