From: Jiayu Hu Date: Fri, 23 Jul 2021 08:09:36 +0000 (+0000) Subject: vhost: handle memory hotplug for async vhost X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=259caa21d70181d7bc986f9921c813abdac90793;hp=b737fd613969df722ddaa1cbcfd83aaad2441dbe;p=dpdk.git vhost: handle memory hotplug for async vhost When the guest memory is hotplugged, the vhost application which enables DMA acceleration must stop DMA transfers before the vhost re-maps the guest memory. This patch is to notify the vhost application of stopping DMA transfers. Signed-off-by: Jiayu Hu Reviewed-by: Maxime Coquelin --- diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c index 31300e194f..433f412fa8 100644 --- a/lib/vhost/vhost_user.c +++ b/lib/vhost/vhost_user.c @@ -1248,6 +1248,7 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg, int numa_node = SOCKET_ID_ANY; uint64_t mmap_offset; uint32_t i; + bool async_notify = false; if (validate_msg_fds(msg, memory->nregions) != 0) return RTE_VHOST_MSG_RESULT_ERR; @@ -1275,6 +1276,16 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg, vdpa_dev->ops->dev_close(dev->vid); dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED; } + + /* notify the vhost application to stop DMA transfers */ + if (dev->async_copy && dev->notify_ops->vring_state_changed) { + for (i = 0; i < dev->nr_vring; i++) { + dev->notify_ops->vring_state_changed(dev->vid, + i, 0); + } + async_notify = true; + } + free_mem_region(dev); rte_free(dev->mem); dev->mem = NULL; @@ -1371,6 +1382,11 @@ vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg, dump_guest_pages(dev); + if (async_notify) { + for (i = 0; i < dev->nr_vring; i++) + dev->notify_ops->vring_state_changed(dev->vid, i, 1); + } + return RTE_VHOST_MSG_RESULT_OK; free_mem_table: