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virtio-devices: vhost_user: Reconnection for slave request handler

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Add the support for reconnecting the backend request handler after a
disconnection/crash happened.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2021-06-09 17:27:14 +02:00
parent acec7e34fc
commit 1a5c6631a5
5 changed files with 39 additions and 29 deletions
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virtio-devices/src/vhost_user/blk.rs
+4 -1
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@@ -23,7 +23,7 @@ use std::vec::Vec;
use vhost::vhost_user::message::VhostUserConfigFlags;
use vhost::vhost_user::message::VHOST_USER_CONFIG_OFFSET;
use vhost::vhost_user::message::{VhostUserProtocolFeatures, VhostUserVirtioFeatures};
use vhost::vhost_user::{Master, VhostUserMaster, VhostUserMasterReqHandler};
use vhost::vhost_user::{Master, MasterReqHandler, VhostUserMaster, VhostUserMasterReqHandler};
use vhost::VhostBackend;
use virtio_bindings::bindings::virtio_blk::{
VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_CONFIG_WCE, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_FLUSH,
@@ -215,6 +215,8 @@ impl VirtioDevice for Blk {
self.guest_memory = Some(mem.clone());
let slave_req_handler: Option<MasterReqHandler<SlaveReqHandler>> = None;
// The backend acknowledged features must contain the protocol feature
// bit in case it was initially set but lost through the features
// negotiation with the guest.
@@ -228,6 +230,7 @@ impl VirtioDevice for Blk {
queue_evts.iter().map(|q| q.try_clone().unwrap()).collect(),
&interrupt_cb,
backend_acked_features,
&slave_req_handler,
)
.map_err(ActivateError::VhostUserBlkSetup)?;