Move Cloud Hypervisor to virtio-queue crate

Relying on the vm-virtio/virtio-queue crate from rust-vmm which has been
copied inside the Cloud Hypervisor tree, the entire codebase is moved to
the new definition of a Queue and other related structures.

The reason for this move is to follow the upstream until we get some
agreement for the patches that we need on top of that to make it
properly work with Cloud Hypervisor.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

virtio-devices/src/vhost_user/mod.rs

@@ -3,7 +3,7 @@
 
 use crate::{
     ActivateError, EpollHelper, EpollHelperError, EpollHelperHandler, GuestMemoryMmap,
-    GuestRegionMmap, Queue, VirtioInterrupt, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_IN_ORDER,
+    GuestRegionMmap, VirtioInterrupt, EPOLL_HELPER_EVENT_LAST, VIRTIO_F_IN_ORDER,
     VIRTIO_F_NOTIFICATION_DATA, VIRTIO_F_ORDER_PLATFORM, VIRTIO_F_RING_EVENT_IDX,
     VIRTIO_F_RING_INDIRECT_DESC, VIRTIO_F_VERSION_1,
 };
@@ -18,12 +18,13 @@ use vhost::vhost_user::message::{
 };
 use vhost::vhost_user::{MasterReqHandler, VhostUserMasterReqHandler};
 use vhost::Error as VhostError;
+use virtio_queue::Error as QueueError;
+use virtio_queue::Queue;
 use vm_memory::{
     mmap::MmapRegionError, Address, Error as MmapError, GuestAddressSpace, GuestMemory,
     GuestMemoryAtomic,
 };
 use vm_migration::{protocol::MemoryRangeTable, MigratableError, Snapshot, VersionMapped};
-use vm_virtio::Error as VirtioError;
 use vmm_sys_util::eventfd::EventFd;
 use vu_common_ctrl::VhostUserHandle;
 
@@ -128,7 +129,7 @@ pub enum Error {
     /// Missing IrqFd
     MissingIrqFd,
     /// Failed getting the available index.
-    GetAvailableIndex(VirtioError),
+    GetAvailableIndex(QueueError),
     /// Migration is not supported by this vhost-user device.
     MigrationNotSupported,
     /// Failed creating memfd.
@@ -166,7 +167,7 @@ pub struct VhostUserEpollHandler<S: VhostUserMasterReqHandler> {
     pub mem: GuestMemoryAtomic<GuestMemoryMmap>,
     pub kill_evt: EventFd,
     pub pause_evt: EventFd,
-    pub queues: Vec<Queue>,
+    pub queues: Vec<Queue<GuestMemoryAtomic<GuestMemoryMmap>>>,
     pub queue_evts: Vec<EventFd>,
     pub virtio_interrupt: Arc<dyn VirtioInterrupt>,
     pub acked_features: u64,
@@ -298,7 +299,7 @@ impl VhostUserCommon {
     pub fn activate<T: VhostUserMasterReqHandler>(
         &mut self,
         mem: GuestMemoryAtomic<GuestMemoryMmap>,
-        queues: Vec<Queue>,
+        queues: Vec<Queue<GuestMemoryAtomic<GuestMemoryMmap>>>,
         queue_evts: Vec<EventFd>,
         interrupt_cb: Arc<dyn VirtioInterrupt>,
         acked_features: u64,