2019-09-02 11:00:35 +00:00
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// Copyright 2019 Intel Corporation. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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2020-09-03 09:37:36 +00:00
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use super::super::{
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ActivateError, ActivateResult, Queue, VirtioCommon, VirtioDevice, VirtioDeviceType,
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};
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2021-07-28 12:52:53 +00:00
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use super::vu_common_ctrl::{VhostUserConfig, VhostUserHandle};
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2021-05-21 16:26:00 +00:00
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use super::{Error, Result, DEFAULT_VIRTIO_FEATURES};
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2021-08-11 08:56:29 +00:00
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use crate::vhost_user::VhostUserCommon;
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2019-12-31 10:49:11 +00:00
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use crate::VirtioInterrupt;
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2021-06-02 19:08:04 +00:00
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use crate::{GuestMemoryMmap, GuestRegionMmap};
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2020-07-14 09:43:33 +00:00
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use block_util::VirtioBlockConfig;
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2019-12-31 10:49:11 +00:00
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use std::mem;
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2019-12-02 20:08:53 +00:00
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use std::result;
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2021-06-03 04:10:31 +00:00
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use std::sync::{Arc, Barrier, Mutex};
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use std::thread;
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2019-09-02 11:00:35 +00:00
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use std::vec::Vec;
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2021-07-26 12:40:55 +00:00
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use versionize::{VersionMap, Versionize, VersionizeResult};
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use versionize_derive::Versionize;
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2021-08-11 08:56:29 +00:00
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use vhost::vhost_user::message::{
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VhostUserConfigFlags, VhostUserProtocolFeatures, VhostUserVirtioFeatures,
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VHOST_USER_CONFIG_OFFSET,
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};
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2021-07-28 12:52:53 +00:00
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use vhost::vhost_user::{MasterReqHandler, VhostUserMaster, VhostUserMasterReqHandler};
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2021-05-21 16:26:00 +00:00
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use virtio_bindings::bindings::virtio_blk::{
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VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_CONFIG_WCE, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_FLUSH,
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VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_SEG_MAX,
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VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_WRITE_ZEROES,
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};
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2021-08-11 08:56:29 +00:00
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use vm_memory::{ByteValued, GuestMemoryAtomic};
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2021-07-26 12:40:55 +00:00
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use vm_migration::{
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2021-08-04 14:16:54 +00:00
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protocol::MemoryRangeTable, Migratable, MigratableError, Pausable, Snapshot, Snapshottable,
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Transportable, VersionMapped,
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2021-07-26 12:40:55 +00:00
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};
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2019-12-31 10:49:11 +00:00
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use vmm_sys_util::eventfd::EventFd;
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2019-09-02 11:00:35 +00:00
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2021-05-19 20:33:04 +00:00
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const DEFAULT_QUEUE_NUMBER: usize = 1;
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2021-07-26 12:40:55 +00:00
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#[derive(Versionize)]
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pub struct State {
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pub avail_features: u64,
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pub acked_features: u64,
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pub config: VirtioBlockConfig,
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2021-08-09 12:02:30 +00:00
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pub acked_protocol_features: u64,
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pub vu_num_queues: usize,
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2021-07-26 12:40:55 +00:00
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}
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impl VersionMapped for State {}
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2019-09-02 11:00:35 +00:00
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struct SlaveReqHandler {}
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impl VhostUserMasterReqHandler for SlaveReqHandler {}
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pub struct Blk {
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2020-09-03 09:37:36 +00:00
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common: VirtioCommon,
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2021-08-11 08:56:29 +00:00
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vu_common: VhostUserCommon,
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2020-04-27 11:56:26 +00:00
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id: String,
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2020-01-27 17:12:58 +00:00
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config: VirtioBlockConfig,
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2021-03-05 13:32:57 +00:00
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guest_memory: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
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2021-06-14 08:46:44 +00:00
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epoll_thread: Option<thread::JoinHandle<()>>,
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2019-09-02 11:00:35 +00:00
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}
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2019-09-23 17:42:52 +00:00
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impl Blk {
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2019-09-02 11:00:35 +00:00
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/// Create a new vhost-user-blk device
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2021-08-09 12:02:30 +00:00
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pub fn new(id: String, vu_cfg: VhostUserConfig, restoring: bool) -> Result<Blk> {
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let num_queues = vu_cfg.num_queues;
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2019-09-02 11:00:35 +00:00
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2021-08-09 12:02:30 +00:00
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if restoring {
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// We need 'queue_sizes' to report a number of queues that will be
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// enough to handle all the potential queues. VirtioPciDevice::new()
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// will create the actual queues based on this information.
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return Ok(Blk {
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common: VirtioCommon {
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device_type: VirtioDeviceType::Block as u32,
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queue_sizes: vec![vu_cfg.queue_size; num_queues],
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paused_sync: Some(Arc::new(Barrier::new(2))),
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min_queues: DEFAULT_QUEUE_NUMBER as u16,
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..Default::default()
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},
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2021-08-11 08:56:29 +00:00
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vu_common: VhostUserCommon {
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socket_path: vu_cfg.socket,
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vu_num_queues: num_queues,
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..Default::default()
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},
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id,
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2021-08-09 12:02:30 +00:00
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config: VirtioBlockConfig::default(),
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guest_memory: None,
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epoll_thread: None,
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});
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}
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2021-07-28 12:52:53 +00:00
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let mut vu =
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VhostUserHandle::connect_vhost_user(false, &vu_cfg.socket, num_queues as u64, false)?;
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2021-05-19 21:58:02 +00:00
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2019-09-02 11:00:35 +00:00
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// Filling device and vring features VMM supports.
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2021-05-21 16:26:00 +00:00
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let mut avail_features = 1 << VIRTIO_BLK_F_SIZE_MAX
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| 1 << VIRTIO_BLK_F_SEG_MAX
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| 1 << VIRTIO_BLK_F_GEOMETRY
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2019-09-02 11:00:35 +00:00
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| 1 << VIRTIO_BLK_F_RO
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| 1 << VIRTIO_BLK_F_BLK_SIZE
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| 1 << VIRTIO_BLK_F_FLUSH
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| 1 << VIRTIO_BLK_F_TOPOLOGY
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2020-05-20 16:39:30 +00:00
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| 1 << VIRTIO_BLK_F_CONFIG_WCE
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2021-05-21 16:26:00 +00:00
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| 1 << VIRTIO_BLK_F_DISCARD
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| 1 << VIRTIO_BLK_F_WRITE_ZEROES
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| DEFAULT_VIRTIO_FEATURES;
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2019-09-02 11:00:35 +00:00
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2021-05-19 20:33:04 +00:00
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if num_queues > 1 {
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2020-02-03 06:24:41 +00:00
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avail_features |= 1 << VIRTIO_BLK_F_MQ;
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}
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2021-05-19 20:33:04 +00:00
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let avail_protocol_features = VhostUserProtocolFeatures::CONFIG
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| VhostUserProtocolFeatures::MQ
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| VhostUserProtocolFeatures::CONFIGURE_MEM_SLOTS
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2021-06-11 11:08:16 +00:00
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| VhostUserProtocolFeatures::REPLY_ACK
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2021-08-06 13:01:37 +00:00
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| VhostUserProtocolFeatures::INFLIGHT_SHMFD
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| VhostUserProtocolFeatures::LOG_SHMFD;
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2021-07-28 12:52:53 +00:00
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let (acked_features, acked_protocol_features) =
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vu.negotiate_features_vhost_user(avail_features, avail_protocol_features)?;
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2021-05-19 20:33:04 +00:00
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let backend_num_queues =
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if acked_protocol_features & VhostUserProtocolFeatures::MQ.bits() != 0 {
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vu.socket_handle()
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.get_queue_num()
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.map_err(Error::VhostUserGetQueueMaxNum)? as usize
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} else {
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DEFAULT_QUEUE_NUMBER
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};
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if num_queues > backend_num_queues {
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error!("vhost-user-blk requested too many queues ({}) since the backend only supports {}\n",
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num_queues, backend_num_queues);
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2020-02-03 06:24:41 +00:00
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return Err(Error::BadQueueNum);
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}
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2021-05-19 20:33:04 +00:00
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2020-01-27 17:12:58 +00:00
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let config_len = mem::size_of::<VirtioBlockConfig>();
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2019-09-11 03:22:48 +00:00
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let config_space: Vec<u8> = vec![0u8; config_len as usize];
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2021-07-28 12:52:53 +00:00
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let (_, config_space) = vu
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.socket_handle()
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2019-09-11 03:22:48 +00:00
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.get_config(
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2020-03-03 11:43:48 +00:00
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VHOST_USER_CONFIG_OFFSET,
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2019-09-11 03:22:48 +00:00
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config_len as u32,
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VhostUserConfigFlags::WRITABLE,
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config_space.as_slice(),
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)
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2021-05-19 20:33:04 +00:00
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.map_err(Error::VhostUserGetConfig)?;
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2020-01-27 17:12:58 +00:00
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let mut config = VirtioBlockConfig::default();
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if let Some(backend_config) = VirtioBlockConfig::from_slice(config_space.as_slice()) {
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config = *backend_config;
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2021-05-19 20:33:04 +00:00
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config.num_queues = num_queues as u16;
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2020-01-27 17:12:58 +00:00
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}
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2019-09-02 11:00:35 +00:00
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Ok(Blk {
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2020-09-03 09:37:36 +00:00
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common: VirtioCommon {
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2021-03-25 16:54:09 +00:00
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device_type: VirtioDeviceType::Block as u32,
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2021-05-19 20:33:04 +00:00
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queue_sizes: vec![vu_cfg.queue_size; num_queues],
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avail_features: acked_features,
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acked_features: 0,
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2021-06-03 04:10:31 +00:00
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paused_sync: Some(Arc::new(Barrier::new(2))),
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2021-05-19 20:33:04 +00:00
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min_queues: DEFAULT_QUEUE_NUMBER as u16,
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2020-09-03 15:56:32 +00:00
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..Default::default()
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2020-09-03 09:37:36 +00:00
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},
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2021-08-11 08:56:29 +00:00
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vu_common: VhostUserCommon {
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vu: Some(Arc::new(Mutex::new(vu))),
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acked_protocol_features,
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socket_path: vu_cfg.socket,
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vu_num_queues: num_queues,
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..Default::default()
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},
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2020-04-27 11:56:26 +00:00
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id,
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2020-01-27 17:12:58 +00:00
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config,
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2021-03-05 13:32:57 +00:00
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guest_memory: None,
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2021-06-14 08:46:44 +00:00
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epoll_thread: None,
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2019-09-02 11:00:35 +00:00
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})
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}
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2021-07-26 12:40:55 +00:00
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fn state(&self) -> State {
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State {
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avail_features: self.common.avail_features,
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acked_features: self.common.acked_features,
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config: self.config,
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2021-08-11 08:56:29 +00:00
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acked_protocol_features: self.vu_common.acked_protocol_features,
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vu_num_queues: self.vu_common.vu_num_queues,
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2021-07-26 12:40:55 +00:00
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}
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}
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fn set_state(&mut self, state: &State) {
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self.common.avail_features = state.avail_features;
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self.common.acked_features = state.acked_features;
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self.config = state.config;
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2021-08-11 08:56:29 +00:00
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self.vu_common.acked_protocol_features = state.acked_protocol_features;
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self.vu_common.vu_num_queues = state.vu_num_queues;
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2021-08-09 12:02:30 +00:00
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2021-08-11 08:56:29 +00:00
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if let Err(e) = self
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.vu_common
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.restore_backend_connection(self.common.acked_features)
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{
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error!(
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"Failed restoring connection with vhost-user backend: {:?}",
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e
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);
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2021-08-09 12:02:30 +00:00
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}
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2021-07-26 12:40:55 +00:00
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}
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2019-09-02 11:00:35 +00:00
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}
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impl Drop for Blk {
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fn drop(&mut self) {
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2020-09-04 08:37:37 +00:00
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if let Some(kill_evt) = self.common.kill_evt.take() {
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2019-09-19 16:14:55 +00:00
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if let Err(e) = kill_evt.write(1) {
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error!("failed to kill vhost-user-blk: {:?}", e);
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}
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2019-09-02 11:00:35 +00:00
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}
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}
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}
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impl VirtioDevice for Blk {
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fn device_type(&self) -> u32 {
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2020-09-04 08:37:37 +00:00
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self.common.device_type
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2019-09-02 11:00:35 +00:00
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}
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fn queue_max_sizes(&self) -> &[u16] {
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2020-09-04 08:37:37 +00:00
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&self.common.queue_sizes
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2019-09-02 11:00:35 +00:00
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}
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2020-01-23 10:14:38 +00:00
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fn features(&self) -> u64 {
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2020-09-03 09:37:36 +00:00
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self.common.avail_features
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2019-09-02 11:00:35 +00:00
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}
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2020-01-23 10:14:38 +00:00
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fn ack_features(&mut self, value: u64) {
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2020-09-03 09:37:36 +00:00
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self.common.ack_features(value)
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}
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2020-07-16 09:34:51 +00:00
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fn read_config(&self, offset: u64, data: &mut [u8]) {
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self.read_config_from_slice(self.config.as_slice(), offset, data);
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2019-09-02 11:00:35 +00:00
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}
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fn write_config(&mut self, offset: u64, data: &[u8]) {
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2020-07-16 10:00:48 +00:00
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// The "writeback" field is the only mutable field
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let writeback_offset =
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(&self.config.writeback as *const _ as u64) - (&self.config as *const _ as u64);
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if offset != writeback_offset || data.len() != std::mem::size_of_val(&self.config.writeback)
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{
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error!(
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"Attempt to write to read-only field: offset {:x} length {}",
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offset,
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data.len()
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);
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2019-09-02 11:00:35 +00:00
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return;
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}
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2020-07-16 10:00:48 +00:00
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self.config.writeback = data[0];
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2021-08-11 08:56:29 +00:00
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if let Some(vu) = &self.vu_common.vu {
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2021-08-06 15:43:53 +00:00
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if let Err(e) = vu
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.lock()
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.unwrap()
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.socket_handle()
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.set_config(offset as u32, VhostUserConfigFlags::WRITABLE, data)
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.map_err(Error::VhostUserSetConfig)
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{
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error!("Failed setting vhost-user-blk configuration: {:?}", e);
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}
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2021-05-19 20:33:04 +00:00
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}
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2019-09-02 11:00:35 +00:00
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}
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fn activate(
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&mut self,
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2020-02-11 16:22:40 +00:00
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mem: GuestMemoryAtomic<GuestMemoryMmap>,
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2020-01-13 17:52:19 +00:00
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interrupt_cb: Arc<dyn VirtioInterrupt>,
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2019-09-02 11:00:35 +00:00
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queues: Vec<Queue>,
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queue_evts: Vec<EventFd>,
|
|
|
|
) -> ActivateResult {
|
2020-09-04 08:37:37 +00:00
|
|
|
self.common.activate(&queues, &queue_evts, &interrupt_cb)?;
|
2021-03-05 13:32:57 +00:00
|
|
|
self.guest_memory = Some(mem.clone());
|
|
|
|
|
2021-06-09 15:27:14 +00:00
|
|
|
let slave_req_handler: Option<MasterReqHandler<SlaveReqHandler>> = None;
|
|
|
|
|
2021-06-03 04:10:31 +00:00
|
|
|
// 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.
|
|
|
|
let backend_acked_features = self.common.acked_features
|
|
|
|
| (self.common.avail_features & VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits());
|
|
|
|
|
|
|
|
// Run a dedicated thread for handling potential reconnections with
|
|
|
|
// the backend.
|
|
|
|
let (kill_evt, pause_evt) = self.common.dup_eventfds();
|
|
|
|
|
2021-08-11 08:56:29 +00:00
|
|
|
let mut handler = self.vu_common.activate(
|
2021-06-03 04:10:31 +00:00
|
|
|
mem,
|
|
|
|
queues,
|
|
|
|
queue_evts,
|
2021-08-11 08:56:29 +00:00
|
|
|
interrupt_cb,
|
|
|
|
backend_acked_features,
|
|
|
|
slave_req_handler,
|
|
|
|
kill_evt,
|
|
|
|
pause_evt,
|
|
|
|
)?;
|
2021-06-03 04:10:31 +00:00
|
|
|
|
|
|
|
let paused = self.common.paused.clone();
|
|
|
|
let paused_sync = self.common.paused_sync.clone();
|
|
|
|
|
|
|
|
thread::Builder::new()
|
2021-06-09 14:33:34 +00:00
|
|
|
.name(self.id.to_string())
|
2021-06-03 04:10:31 +00:00
|
|
|
.spawn(move || {
|
2021-06-14 08:46:44 +00:00
|
|
|
if let Err(e) = handler.run(paused, paused_sync.unwrap()) {
|
|
|
|
error!("Error running vhost-user-blk worker: {:?}", e);
|
2021-06-03 04:10:31 +00:00
|
|
|
}
|
|
|
|
})
|
2021-06-14 08:46:44 +00:00
|
|
|
.map(|thread| self.epoll_thread = Some(thread))
|
2021-06-03 04:10:31 +00:00
|
|
|
.map_err(|e| {
|
|
|
|
error!("failed to clone queue EventFd: {}", e);
|
|
|
|
ActivateError::BadActivate
|
|
|
|
})?;
|
|
|
|
|
2019-09-02 11:00:35 +00:00
|
|
|
Ok(())
|
|
|
|
}
|
2019-09-19 16:14:55 +00:00
|
|
|
|
2021-01-18 12:38:08 +00:00
|
|
|
fn reset(&mut self) -> Option<Arc<dyn VirtioInterrupt>> {
|
2019-12-02 20:08:53 +00:00
|
|
|
// We first must resume the virtio thread if it was paused.
|
2020-09-04 08:37:37 +00:00
|
|
|
if self.common.pause_evt.take().is_some() {
|
|
|
|
self.common.resume().ok()?;
|
2019-12-02 20:08:53 +00:00
|
|
|
}
|
|
|
|
|
2021-08-11 08:56:29 +00:00
|
|
|
if let Some(vu) = &self.vu_common.vu {
|
2021-08-06 15:43:53 +00:00
|
|
|
if let Err(e) = vu
|
|
|
|
.lock()
|
|
|
|
.unwrap()
|
|
|
|
.reset_vhost_user(self.common.queue_sizes.len())
|
|
|
|
{
|
|
|
|
error!("Failed to reset vhost-user daemon: {:?}", e);
|
|
|
|
return None;
|
|
|
|
}
|
2019-09-19 16:14:55 +00:00
|
|
|
}
|
|
|
|
|
2020-09-04 08:37:37 +00:00
|
|
|
if let Some(kill_evt) = self.common.kill_evt.take() {
|
2019-09-19 16:14:55 +00:00
|
|
|
// Ignore the result because there is nothing we can do about it.
|
|
|
|
let _ = kill_evt.write(1);
|
|
|
|
}
|
|
|
|
|
2021-02-18 15:10:51 +00:00
|
|
|
event!("virtio-device", "reset", "id", &self.id);
|
|
|
|
|
2021-01-18 12:38:08 +00:00
|
|
|
// Return the interrupt
|
|
|
|
Some(self.common.interrupt_cb.take().unwrap())
|
2019-09-19 16:14:55 +00:00
|
|
|
}
|
2020-02-14 10:08:59 +00:00
|
|
|
|
|
|
|
fn shutdown(&mut self) {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.shutdown()
|
2020-02-14 10:08:59 +00:00
|
|
|
}
|
2020-03-23 12:47:55 +00:00
|
|
|
|
2021-03-05 13:32:57 +00:00
|
|
|
fn add_memory_region(
|
|
|
|
&mut self,
|
|
|
|
region: &Arc<GuestRegionMmap>,
|
|
|
|
) -> std::result::Result<(), crate::Error> {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.add_memory_region(&self.guest_memory, region)
|
2021-03-05 13:32:57 +00:00
|
|
|
}
|
2019-09-02 11:00:35 +00:00
|
|
|
}
|
2019-12-02 20:08:53 +00:00
|
|
|
|
2020-09-04 08:37:37 +00:00
|
|
|
impl Pausable for Blk {
|
|
|
|
fn pause(&mut self) -> result::Result<(), MigratableError> {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.pause()?;
|
2020-09-04 08:37:37 +00:00
|
|
|
self.common.pause()
|
|
|
|
}
|
|
|
|
|
|
|
|
fn resume(&mut self) -> result::Result<(), MigratableError> {
|
2021-06-03 04:10:31 +00:00
|
|
|
self.common.resume()?;
|
|
|
|
|
2021-06-14 08:46:44 +00:00
|
|
|
if let Some(epoll_thread) = &self.epoll_thread {
|
|
|
|
epoll_thread.thread().unpark();
|
2021-06-03 04:10:31 +00:00
|
|
|
}
|
2021-07-26 20:06:54 +00:00
|
|
|
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.resume()
|
2020-09-04 08:37:37 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-04-27 11:56:26 +00:00
|
|
|
impl Snapshottable for Blk {
|
|
|
|
fn id(&self) -> String {
|
|
|
|
self.id.clone()
|
|
|
|
}
|
2021-07-26 12:40:55 +00:00
|
|
|
|
|
|
|
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.snapshot(&self.id(), &self.state())
|
2021-07-26 12:40:55 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
|
|
|
|
self.set_state(&snapshot.to_versioned_state(&self.id)?);
|
|
|
|
Ok(())
|
|
|
|
}
|
2020-04-27 11:56:26 +00:00
|
|
|
}
|
2019-05-01 16:59:51 +00:00
|
|
|
impl Transportable for Blk {}
|
2021-08-04 14:16:54 +00:00
|
|
|
|
|
|
|
impl Migratable for Blk {
|
|
|
|
fn start_dirty_log(&mut self) -> std::result::Result<(), MigratableError> {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.start_dirty_log(&self.guest_memory)
|
2021-08-04 14:16:54 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn stop_dirty_log(&mut self) -> std::result::Result<(), MigratableError> {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.stop_dirty_log()
|
2021-08-04 14:16:54 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
fn dirty_log(&mut self) -> std::result::Result<MemoryRangeTable, MigratableError> {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common.dirty_log(&self.guest_memory)
|
2021-08-04 14:16:54 +00:00
|
|
|
}
|
2021-08-09 09:05:20 +00:00
|
|
|
|
|
|
|
fn complete_migration(&mut self) -> std::result::Result<(), MigratableError> {
|
2021-08-11 08:56:29 +00:00
|
|
|
self.vu_common
|
|
|
|
.complete_migration(self.common.kill_evt.take())
|
2021-08-09 09:05:20 +00:00
|
|
|
}
|
2021-08-04 14:16:54 +00:00
|
|
|
}
|