[hyperlight_host] mshv: dump core on unknown HV message

Usually, an unknown HV message is the result of a double fault or
similar: something going wrong in the guest. This commit ensures that a
core file is generated when this happens and the crashdump feature is
enabled.

Signed-off-by: Lucy Menon <[email protected]>

[hyperlight_host] Expose MemoryRegion structure

It is a convenient tuple of information to use when mapping a new region
into the sandbox.

Signed-off-by: Lucy Menon <[email protected]>

Author: syntactically

src/hyperlight_host/src/hypervisor/hyperv_linux.rs

@@ -775,6 +775,8 @@ impl Hypervisor for HypervLinuxDriver {
                 }
                 other => {
                     crate::debug!("mshv Other Exit: Exit: {:#?} \n {:#?}", other, &self);
+                    #[cfg(crashdump)]
+                    let _ = crashdump::generate_crashdump(self);
                     log_then_return!("unknown Hyper-V run message type {:?}", other);
                 }
             },

src/hyperlight_host/src/mem/memory_region.rs

@@ -182,13 +182,13 @@ pub enum MemoryRegionType {
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct MemoryRegion {
     /// the range of guest memory addresses
-    pub(crate) guest_region: Range<usize>,
+    pub guest_region: Range<usize>,
     /// the range of host memory addresses
-    pub(crate) host_region: Range<usize>,
+    pub host_region: Range<usize>,
     /// memory access flags for the given region
-    pub(crate) flags: MemoryRegionFlags,
+    pub flags: MemoryRegionFlags,
     /// the type of memory region
-    pub(crate) region_type: MemoryRegionType,
+    pub region_type: MemoryRegionType,
 }
 
 pub(crate) struct MemoryRegionVecBuilder {