virtio-devices, vmm: Move to ExternalDmaMapping from vm-device

Now that ExternalDmaMapping is defined in vm-device, let's use it from
there.

This commit also defines the function get_host_address_range() to move
away from the vfio-ioctls dependency.

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

virtio-devices/src/iommu.rs

@@ -22,7 +22,7 @@ use std::result;
 use std::sync::atomic::AtomicBool;
 use std::sync::{Arc, Barrier, RwLock};
 use std::thread;
-use vfio_ioctls::ExternalDmaMapping;
+use vm_device::dma_mapping::ExternalDmaMapping;
 use vm_memory::{
     Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
     GuestMemoryError, GuestMemoryMmap,

virtio-devices/src/lib.rs

@@ -59,6 +59,7 @@ pub use self::pmem::*;
 pub use self::rng::*;
 pub use self::vsock::*;
 pub use self::watchdog::*;
+use vm_memory::{GuestAddress, GuestMemory};
 use vm_virtio::{queue::*, VirtioDeviceType};
 
 const DEVICE_INIT: u32 = 0x00;
@@ -125,3 +126,19 @@ pub enum Error {
     NetQueuePair(::net_util::NetQueuePairError),
     ApplySeccompFilter(seccomp::Error),
 }
+
+/// Convert an absolute address into an address space (GuestMemory)
+/// to a host pointer and verify that the provided size define a valid
+/// range within a single memory region.
+/// Return None if it is out of bounds or if addr+size overlaps a single region.
+pub fn get_host_address_range<M: GuestMemory>(
+    mem: &M,
+    addr: GuestAddress,
+    size: usize,
+) -> Option<*mut u8> {
+    if mem.check_range(addr, size) {
+        Some(mem.get_host_address(addr).unwrap())
+    } else {
+        None
+    }
+}

virtio-devices/src/vhost_user/vu_common_ctrl.rs

@@ -3,13 +3,12 @@
 
 use super::super::{Descriptor, Queue};
 use super::{Error, Result};
-use crate::{VirtioInterrupt, VirtioInterruptType};
+use crate::{get_host_address_range, VirtioInterrupt, VirtioInterruptType};
 use libc::EFD_NONBLOCK;
 use std::convert::TryInto;
 use std::os::unix::io::AsRawFd;
 use std::sync::Arc;
 use std::vec::Vec;
-use vfio_ioctls::get_host_address_range;
 use vhost_rs::vhost_user::{Master, VhostUserMaster};
 use vhost_rs::{VhostBackend, VhostUserMemoryRegionInfo, VringConfigData};
 use vm_memory::{Address, Error as MmapError, GuestMemory, GuestMemoryMmap, GuestMemoryRegion};

virtio-devices/src/vsock/packet.rs

@@ -17,10 +17,9 @@
 ///
 use byteorder::{ByteOrder, LittleEndian};
 
-use super::super::DescriptorChain;
 use super::defs;
 use super::{Result, VsockError};
-use vfio_ioctls::get_host_address_range;
+use crate::{get_host_address_range, DescriptorChain};
 
 // The vsock packet header is defined by the C struct:
 //