misc: Upgrade to use the vm-memory crate w/ dirty-page-tracking

As the first step to complete live-migration with tracking dirty-pages
written by the VMM, this commit patches the dependent vm-memory crate to
the upstream version with the dirty-page-tracking capability. Most
changes are due to the updated `GuestMemoryMmap`, `GuestRegionMmap`, and
`MmapRegion` structs which are taking an additional generic type
parameter to specify what 'bitmap backend' is used.

The above changes should be transparent to the rest of the code base,
e.g. all unit/integration tests should pass without additional changes.

Signed-off-by: Bo Chen <chen.bo@intel.com>

virtio-devices/src/vsock/device.rs

@@ -30,6 +30,7 @@
 use super::{VsockBackend, VsockPacket};
 use crate::seccomp_filters::{get_seccomp_filter, Thread};
 use crate::Error as DeviceError;
+use crate::GuestMemoryMmap;
 use crate::VirtioInterrupt;
 use crate::{
     ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler, Queue,
@@ -47,7 +48,7 @@ use std::sync::{Arc, Barrier, RwLock};
 use std::thread;
 use versionize::{VersionMap, Versionize, VersionizeResult};
 use versionize_derive::Versionize;
-use vm_memory::{GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
+use vm_memory::{GuestAddressSpace, GuestMemoryAtomic};
 use vm_migration::{
     Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable, VersionMapped,
 };

virtio-devices/src/vsock/mod.rs

@@ -163,11 +163,12 @@ mod tests {
     use crate::device::{VirtioInterrupt, VirtioInterruptType};
     use crate::epoll_helper::EpollHelperHandler;
     use crate::EpollHelper;
+    use crate::GuestMemoryMmap;
     use libc::EFD_NONBLOCK;
     use std::os::unix::io::AsRawFd;
     use std::path::PathBuf;
     use std::sync::{Arc, RwLock};
-    use vm_memory::{GuestAddress, GuestMemoryAtomic, GuestMemoryMmap};
+    use vm_memory::{GuestAddress, GuestMemoryAtomic};
     use vm_virtio::queue::testing::VirtQueue as GuestQ;
     use vm_virtio::queue::Queue;
     use vm_virtio::queue::{VIRTQ_DESC_F_NEXT, VIRTQ_DESC_F_WRITE};

virtio-devices/src/vsock/packet.rs

@@ -342,7 +342,8 @@ mod tests {
     use super::super::tests::TestContext;
     use super::*;
     use crate::vsock::defs::MAX_PKT_BUF_SIZE;
-    use vm_memory::{GuestAddress, GuestMemoryMmap};
+    use crate::GuestMemoryMmap;
+    use vm_memory::GuestAddress;
     use vm_virtio::queue::testing::VirtqDesc as GuestQDesc;
     use vm_virtio::queue::VIRTQ_DESC_F_WRITE;