chore: adjust to api changes in rust-vmm crates

vm-memory: GuestMemoryIterator is gone
kvm-ioctls: DeviceFd::get_device_attr is now unsafe.

Signed-off-by: Patrick Roy <[email protected]>

src/vmm/src/arch/aarch64/gic/gicv2/regs/mod.rs

@@ -41,6 +41,8 @@ pub fn restore_state(fd: &DeviceFd, mpidrs: &[u64], state: &GicState) -> Result<
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::undocumented_unsafe_blocks)]
+
     use kvm_ioctls::Kvm;
 
     use super::*;

src/vmm/src/arch/aarch64/gic/gicv3/regs/mod.rs

@@ -46,6 +46,8 @@ pub fn restore_state(fd: &DeviceFd, mpidrs: &[u64], state: &GicState) -> Result<
 
 #[cfg(test)]
 mod tests {
+    #![allow(clippy::undocumented_unsafe_blocks)]
+
     use kvm_ioctls::Kvm;
 
     use super::*;

src/vmm/src/arch/aarch64/gic/regs.rs

@@ -81,8 +81,12 @@ pub(crate) trait VgicRegEngine {
         let mut data = Vec::with_capacity(reg.iter::<Self::RegChunk>().count());
         for offset in reg.iter::<Self::RegChunk>() {
             let mut val = Self::RegChunk::default();
-            fd.get_device_attr(&mut Self::kvm_device_attr(offset, &mut val, mpidr))
-                .map_err(|err| GicError::DeviceAttribute(err, false, Self::group()))?;
+            // SAFETY: `val` is a mutable memory location sized correctly for the attribute we're
+            // requesting
+            unsafe {
+                fd.get_device_attr(&mut Self::kvm_device_attr(offset, &mut val, mpidr))
+                    .map_err(|err| GicError::DeviceAttribute(err, false, Self::group()))?;
+            }
             data.push(val);
         }
 

src/vmm/src/devices/virtio/queue.rs

@@ -700,7 +700,6 @@ mod verification {
     use std::mem::ManuallyDrop;
     use std::num::Wrapping;
 
-    use vm_memory::guest_memory::GuestMemoryIterator;
     use vm_memory::{GuestMemoryRegion, MemoryRegionAddress};
 
     use super::*;
@@ -717,13 +716,8 @@ mod verification {
         the_region: vm_memory::GuestRegionMmap,
     }
 
-    impl<'a> GuestMemoryIterator<'a, vm_memory::GuestRegionMmap> for ProofGuestMemory {
-        type Iter = std::iter::Once<&'a vm_memory::GuestRegionMmap>;
-    }
-
     impl GuestMemory for ProofGuestMemory {
         type R = vm_memory::GuestRegionMmap;
-        type I = Self;
 
         fn num_regions(&self) -> usize {
             1
@@ -735,7 +729,7 @@ mod verification {
                 .map(|_| &self.the_region)
         }
 
-        fn iter(&self) -> <Self::I as GuestMemoryIterator<Self::R>>::Iter {
+        fn iter(&self) -> impl Iterator<Item = &Self::R> {
             std::iter::once(&self.the_region)
         }